~hc/RK356X_SDK_RELEASE.git

..	..	@@ -13,7 +13,7 @@
13	13	For ARM64, ONLY "acpi=off", "acpi=on" or "acpi=force"
14	14	are available
15	15
16		- See also Documentation/power/runtime_pm.txt, pci=noacpi
	16	+ See also Documentation/power/runtime_pm.rst, pci=noacpi
17	17
18	18	acpi_apic_instance= [ACPI, IOAPIC]
19	19	Format: <int>
..	..	@@ -22,11 +22,13 @@
22	22	default: 0
23	23
24	24	acpi_backlight= [HW,ACPI]
25		- acpi_backlight=vendor
26		- acpi_backlight=video
27		- If set to vendor, prefer vendor specific driver
	25	+ { vendor \| video \| native \| none }
	26	+ If set to vendor, prefer vendor-specific driver
28	27	(e.g. thinkpad_acpi, sony_acpi, etc.) instead
29	28	of the ACPI video.ko driver.
	29	+ If set to video, use the ACPI video.ko driver.
	30	+ If set to native, use the device's native backlight mode.
	31	+ If set to none, disable the ACPI backlight interface.
30	32
31	33	acpi_force_32bit_fadt_addr
32	34	force FADT to use 32 bit addresses rather than the
..	..	@@ -53,7 +55,7 @@
53	55	ACPI_DEBUG_PRINT statements, e.g.,
54	56	ACPI_DEBUG_PRINT((ACPI_DB_INFO, ...
55	57	The debug_level mask defaults to "info". See
56		- Documentation/acpi/debug.txt for more information about
	58	+ Documentation/firmware-guide/acpi/debug.rst for more information about
57	59	debug layers and levels.
58	60
59	61	Enable processor driver info messages:
..	..	@@ -227,7 +229,7 @@
227	229	acpi_sleep= [HW,ACPI] Sleep options
228	230	Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig,
229	231	old_ordering, nonvs, sci_force_enable, nobl }
230		- See Documentation/power/video.txt for information on
	232	+ See Documentation/power/video.rst for information on
231	233	s3_bios and s3_mode.
232	234	s3_beep is for debugging; it makes the PC's speaker beep
233	235	as soon as the kernel's real-mode entry point is called.
..	..	@@ -287,6 +289,20 @@
287	289	do not want to use tracing_snapshot_alloc() as it needs
288	290	to be done where GFP_KERNEL allocations are allowed.
289	291
	292	+ allow_file_spec_access
	293	+ Allow speculative faults on file backed pages.
	294	+ Speculative faults are enabled only for those vm_ops
	295	+ that implement and return true for allow_speculation
	296	+ callback.
	297	+
	298	+ allow_mismatched_32bit_el0 [ARM64]
	299	+ Allow execve() of 32-bit applications and setting of the
	300	+ PER_LINUX32 personality on systems where only a strict
	301	+ subset of the CPUs support 32-bit EL0. When this
	302	+ parameter is present, the set of CPUs supporting 32-bit
	303	+ EL0 is indicated by /sys/devices/system/cpu/aarch32_el0
	304	+ and hot-unplug operations may be restricted.
	305	+
290	306	amd_iommu= [HW,X86-64]
291	307	Pass parameters to the AMD IOMMU driver in the system.
292	308	Possible values are:
..	..	@@ -335,7 +351,7 @@
335	351	APC and your system crashes randomly.
336	352
337	353	apic= [APIC,X86] Advanced Programmable Interrupt Controller
338		- Change the output verbosity whilst booting
	354	+ Change the output verbosity while booting
339	355	Format: { quiet (default) \| verbose \| debug }
340	356	Change the amount of debugging information output
341	357	when initialising the APIC and IO-APIC components.
..	..	@@ -354,7 +370,7 @@
354	370	shot down by NMI
355	371
356	372	autoconf= [IPV6]
357		- See Documentation/networking/ipv6.txt.
	373	+ See Documentation/networking/ipv6.rst.
358	374
359	375	show_lapic= [APIC,X86] Advanced Programmable Interrupt Controller
360	376	Limit apic dumping. The parameter defines the maximal
..	..	@@ -370,6 +386,15 @@
370	386
371	387	arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
372	388	Format: <io>,<irq>,<nodeID>
	389	+
	390	+ arm64.nobti [ARM64] Unconditionally disable Branch Target
	391	+ Identification support
	392	+
	393	+ arm64.nopauth [ARM64] Unconditionally disable Pointer Authentication
	394	+ support
	395	+
	396	+ arm64.nomte [ARM64] Unconditionally disable Memory Tagging Extension
	397	+ support
373	398
374	399	ataflop= [HW,M68k]
375	400
..	..	@@ -434,22 +459,29 @@
434	459
435	460	blkdevparts= Manual partition parsing of block device(s) for
436	461	embedded devices based on command line input.
437		- See Documentation/block/cmdline-partition.txt
	462	+ See Documentation/block/cmdline-partition.rst
438	463
439	464	boot_delay= Milliseconds to delay each printk during boot.
440	465	Values larger than 10 seconds (10000) are changed to
441	466	no delay (0).
442	467	Format: integer
443	468
444		- bootmem_debug [KNL] Enable bootmem allocator debug messages.
	469	+ bootconfig [KNL]
	470	+ Extended command line options can be added to an initrd
	471	+ and this will cause the kernel to look for it.
	472	+
	473	+ See Documentation/admin-guide/bootconfig.rst
445	474
446	475	bert_disable [ACPI]
447	476	Disable BERT OS support on buggy BIOSes.
448	477
	478	+ bgrt_disable [ACPI][X86]
	479	+ Disable BGRT to avoid flickering OEM logo.
	480	+
449	481	bttv.card= [HW,V4L] bttv (bt848 + bt878 based grabber cards)
450	482	bttv.radio= Most important insmod options are available as
451	483	kernel args too.
452		- bttv.pll= See Documentation/media/v4l-drivers/bttv.rst
	484	+ bttv.pll= See Documentation/admin-guide/media/bttv.rst
453	485	bttv.tuner=
454	486
455	487	bulk_remove=off [PPC] This parameter disables the use of the pSeries
..	..	@@ -465,6 +497,11 @@
465	497	possible to determine what the correct size should be.
466	498	This option provides an override for these situations.
467	499
	500	+ carrier_timeout=
	501	+ [NET] Specifies amount of time (in seconds) that
	502	+ the kernel should wait for a network carrier. By default
	503	+ it waits 120 seconds.
	504	+
468	505	ca_keys= [KEYS] This parameter identifies a specific key(s) on
469	506	the system trusted keyring to be used for certificate
470	507	trust validation.
..	..	@@ -477,7 +514,7 @@
477	514	others).
478	515
479	516	ccw_timeout_log [S390]
480		- See Documentation/s390/CommonIO for details.
	517	+ See Documentation/s390/common_io.rst for details.
481	518
482	519	cgroup_disable= [KNL] Disable a particular controller or optional feature
483	520	Format: {name of the controller(s) or feature(s) to disable}
..	..	@@ -517,10 +554,11 @@
517	554	1 -- check protection requested by application.
518	555	Default value is set via a kernel config option.
519	556	Value can be changed at runtime via
520		- /selinux/checkreqprot.
	557	+ /sys/fs/selinux/checkreqprot.
	558	+ Setting checkreqprot to 1 is deprecated.
521	559
522	560	cio_ignore= [S390]
523		- See Documentation/s390/CommonIO for details.
	561	+ See Documentation/s390/common_io.rst for details.
524	562	clk_ignore_unused
525	563	[CLK]
526	564	Prevents the clock framework from automatically gating
..	..	@@ -587,13 +625,24 @@
587	625	some critical bits.
588	626
589	627	cma=nn[MG]@[start[MG][-end[MG]]]
590		- [ARM,X86,KNL]
	628	+ [KNL,CMA]
591	629	Sets the size of kernel global memory area for
592	630	contiguous memory allocations and optionally the
593	631	placement constraint by the physical address range of
594	632	memory allocations. A value of 0 disables CMA
595	633	altogether. For more information, see
596		- include/linux/dma-contiguous.h
	634	+ kernel/dma/contiguous.c
	635	+
	636	+ cma_pernuma=nn[MG]
	637	+ [ARM64,KNL]
	638	+ Sets the size of kernel per-numa memory area for
	639	+ contiguous memory allocations. A value of 0 disables
	640	+ per-numa CMA altogether. And If this option is not
	641	+ specificed, the default value is 0.
	642	+ With per-numa CMA enabled, DMA users on node nid will
	643	+ first try to allocate buffer from the pernuma area
	644	+ which is located in node nid, if the allocation fails,
	645	+ they will fallback to the global default memory area.
597	646
598	647	cmo_free_hint= [PPC] Format: { yes \| no }
599	648	Specify whether pages are marked as being inactive
..	..	@@ -634,7 +683,7 @@
634	683
635	684	See Documentation/admin-guide/serial-console.rst for more
636	685	information. See
637		- Documentation/networking/netconsole.txt for an
	686	+ Documentation/networking/netconsole.rst for an
638	687	alternative.
639	688
640	689	uart[8250],io,<addr>[,options]
..	..	@@ -681,7 +730,7 @@
681	730	coredump_filter=
682	731	[KNL] Change the default value for
683	732	/proc/<pid>/coredump_filter.
684		- See also Documentation/filesystems/proc.txt.
	733	+ See also Documentation/filesystems/proc.rst.
685	734
686	735	coresight_cpu_debug.enable
687	736	[ARM,ARM64]
..	..	@@ -693,8 +742,16 @@
693	742	cpuidle.off=1 [CPU_IDLE]
694	743	disable the cpuidle sub-system
695	744
	745	+ cpuidle.governor=
	746	+ [CPU_IDLE] Name of the cpuidle governor to use.
	747	+
696	748	cpufreq.off=1 [CPU_FREQ]
697	749	disable the cpufreq sub-system
	750	+
	751	+ cpufreq.default_governor=
	752	+ [CPU_FREQ] Name of the default cpufreq governor or
	753	+ policy to use. This governor must be registered in the
	754	+ kernel before the cpufreq driver probes.
698	755
699	756	cpu_init_udelay=N
700	757	[X86] Delay for N microsec between assert and de-assert
..	..	@@ -711,25 +768,28 @@
711	768	upon panic. This parameter reserves the physical
712	769	memory region [offset, offset + size] for that kernel
713	770	image. If '@offset' is omitted, then a suitable offset
714		- is selected automatically. Check
715		- Documentation/kdump/kdump.txt for further details.
	771	+ is selected automatically.
	772	+ [KNL, X86-64] Select a region under 4G first, and
	773	+ fall back to reserve region above 4G when '@offset'
	774	+ hasn't been specified.
	775	+ See Documentation/admin-guide/kdump/kdump.rst for further details.
716	776
717	777	crashkernel=range1:size1[,range2:size2,...][@offset]
718	778	[KNL] Same as above, but depends on the memory
719	779	in the running system. The syntax of range is
720	780	start-[end] where start and end are both
721	781	a memory unit (amount[KMG]). See also
722		- Documentation/kdump/kdump.txt for an example.
	782	+ Documentation/admin-guide/kdump/kdump.rst for an example.
723	783
724	784	crashkernel=size[KMG],high
725		- [KNL, x86_64] range could be above 4G. Allow kernel
	785	+ [KNL, X86-64] range could be above 4G. Allow kernel
726	786	to allocate physical memory region from top, so could
727	787	be above 4G if system have more than 4G ram installed.
728	788	Otherwise memory region will be allocated below 4G, if
729	789	available.
730	790	It will be ignored if crashkernel=X is specified.
731	791	crashkernel=size[KMG],low
732		- [KNL, x86_64] range under 4G. When crashkernel=X,high
	792	+ [KNL, X86-64] range under 4G. When crashkernel=X,high
733	793	is passed, kernel could allocate physical memory region
734	794	above 4G, that cause second kernel crash on system
735	795	that require some amount of low memory, e.g. swiotlb
..	..	@@ -809,27 +869,41 @@
809	869	tracking down these problems.
810	870
811	871	debug_pagealloc=
812		- [KNL] When CONFIG_DEBUG_PAGEALLOC is set, this
813		- parameter enables the feature at boot time. In
814		- default, it is disabled. We can avoid allocating huge
815		- chunk of memory for debug pagealloc if we don't enable
816		- it at boot time and the system will work mostly same
817		- with the kernel built without CONFIG_DEBUG_PAGEALLOC.
	872	+ [KNL] When CONFIG_DEBUG_PAGEALLOC is set, this parameter
	873	+ enables the feature at boot time. By default, it is
	874	+ disabled and the system will work mostly the same as a
	875	+ kernel built without CONFIG_DEBUG_PAGEALLOC.
	876	+ Note: to get most of debug_pagealloc error reports, it's
	877	+ useful to also enable the page_owner functionality.
818	878	on: enable the feature
	879	+
	880	+ debugfs= [KNL] This parameter enables what is exposed to userspace
	881	+ and debugfs internal clients.
	882	+ Format: { on, no-mount, off }
	883	+ on: All functions are enabled.
	884	+ no-mount:
	885	+ Filesystem is not registered but kernel clients can
	886	+ access APIs and a crashkernel can be used to read
	887	+ its content. There is nothing to mount.
	888	+ off: Filesystem is not registered and clients
	889	+ get a -EPERM as result when trying to register files
	890	+ or directories within debugfs.
	891	+ This is equivalent of the runtime functionality if
	892	+ debugfs was not enabled in the kernel at all.
	893	+ Default value is set in build-time with a kernel configuration.
819	894
820	895	debugpat [X86] Enable PAT debugging
821	896
822		- decnet.addr= [HW,NET]
823		- Format: <area>[,<node>]
824		- See also Documentation/networking/decnet.txt.
825		-
826	897	default_hugepagesz=
827		- [same as hugepagesz=] The size of the default
828		- HugeTLB page size. This is the size represented by
829		- the legacy /proc/ hugepages APIs, used for SHM, and
830		- default size when mounting hugetlbfs filesystems.
831		- Defaults to the default architecture's huge page size
832		- if not specified.
	898	+ [HW] The size of the default HugeTLB page. This is
	899	+ the size represented by the legacy /proc/ hugepages
	900	+ APIs. In addition, this is the default hugetlb size
	901	+ used for shmget(), mmap() and mounting hugetlbfs
	902	+ filesystems. If not specified, defaults to the
	903	+ architecture's default huge page size. Huge page
	904	+ sizes are architecture dependent. See also
	905	+ Documentation/admin-guide/mm/hugetlbpage.rst.
	906	+ Format: size[KMG]
833	907
834	908	deferred_probe_timeout=
835	909	[KNL] Debugging option to set a timeout in seconds for
..	..	@@ -840,6 +914,18 @@
840	914	dump out devices still on the deferred probe list after
841	915	retrying.
842	916
	917	+ dfltcc= [HW,S390]
	918	+ Format: { on \| off \| def_only \| inf_only \| always }
	919	+ on: s390 zlib hardware support for compression on
	920	+ level 1 and decompression (default)
	921	+ off: No s390 zlib hardware support
	922	+ def_only: s390 zlib hardware support for deflate
	923	+ only (compression on level 1)
	924	+ inf_only: s390 zlib hardware support for inflate
	925	+ only (decompression)
	926	+ always: Same as 'on' but ignores the selected compression
	927	+ level always using hardware support (used for debugging)
	928	+
843	929	dhash_entries= [KNL]
844	930	Set number of hash buckets for dentry cache.
845	931
..	..	@@ -849,8 +935,17 @@
849	935	can be useful when debugging issues that require an SLB
850	936	miss to occur.
851	937
	938	+ disable_dma32= [KNL]
	939	+ Dynamically disable ZONE_DMA32 on kernels compiled with
	940	+ CONFIG_ZONE_DMA32=y.
	941	+
	942	+ stress_slb [PPC]
	943	+ Limits the number of kernel SLB entries, and flushes
	944	+ them frequently to increase the rate of SLB faults
	945	+ on kernel addresses.
	946	+
852	947	disable= [IPV6]
853		- See Documentation/networking/ipv6.txt.
	948	+ See Documentation/networking/ipv6.rst.
854	949
855	950	hardened_usercopy=
856	951	[KNL] Under CONFIG_HARDENED_USERCOPY, whether
..	..	@@ -866,6 +961,14 @@
866	961	disable_radix [PPC]
867	962	Disable RADIX MMU mode on POWER9
868	963
	964	+ radix_hcall_invalidate=on [PPC/PSERIES]
	965	+ Disable RADIX GTSE feature and use hcall for TLB
	966	+ invalidate.
	967	+
	968	+ disable_tlbie [PPC]
	969	+ Disable TLBIE instruction. Currently does not work
	970	+ with KVM, with HASH MMU, or with coherent accelerators.
	971	+
869	972	disable_cpu_apicid= [X86,APIC,SMP]
870	973	Format: <int>
871	974	The number of initial APIC ID for the
..	..	@@ -875,12 +978,18 @@
875	978	causing system reset or hang due to sending
876	979	INIT from AP to BSP.
877	980
	981	+ perf_v4_pmi= [X86,INTEL]
	982	+ Format: <bool>
	983	+ Disable Intel PMU counter freezing feature.
	984	+ The feature only exists starting from
	985	+ Arch Perfmon v4 (Skylake and newer).
	986	+
878	987	disable_ddw [PPC/PSERIES]
879		- Disable Dynamic DMA Window support. Use this if
	988	+ Disable Dynamic DMA Window support. Use this
880	989	to workaround buggy firmware.
881	990
882	991	disable_ipv6= [IPV6]
883		- See Documentation/networking/ipv6.txt.
	992	+ See Documentation/networking/ipv6.rst.
884	993
885	994	disable_mtrr_cleanup [X86]
886	995	The kernel tries to adjust MTRR layout from continuous
..	..	@@ -930,7 +1039,7 @@
930	1039	edid/1680x1050.bin, or edid/1920x1080.bin is given
931	1040	and no file with the same name exists. Details and
932	1041	instructions how to build your own EDID data are
933		- available in Documentation/EDID/HOWTO.txt. An EDID
	1042	+ available in Documentation/admin-guide/edid.rst. An EDID
934	1043	data set will only be used for a particular connector,
935	1044	if its name and a colon are prepended to the EDID
936	1045	name. Each connector may use a unique EDID data
..	..	@@ -955,19 +1064,15 @@
955	1064	what data is available or for reverse-engineering.
956	1065
957	1066	dyndbg[="val"] [KNL,DYNAMIC_DEBUG]
958		- module.dyndbg[="val"]
	1067	+ <module>.dyndbg[="val"]
959	1068	Enable debug messages at boot time. See
960	1069	Documentation/admin-guide/dynamic-debug-howto.rst
961	1070	for details.
962	1071
963		- nompx [X86] Disables Intel Memory Protection Extensions.
964		- See Documentation/x86/intel_mpx.txt for more
965		- information about the feature.
966		-
967	1072	nopku [X86] Disable Memory Protection Keys CPU feature found
968	1073	in some Intel CPUs.
969	1074
970		- module.async_probe [KNL]
	1075	+ <module>.async_probe [KNL]
971	1076	Enable asynchronous probe on this module.
972	1077
973	1078	early_ioremap_debug [KNL]
..	..	@@ -977,12 +1082,10 @@
977	1082
978	1083	earlycon= [KNL] Output early console device and options.
979	1084
980		- [ARM64] The early console is determined by the
981		- stdout-path property in device tree's chosen node,
982		- or determined by the ACPI SPCR table.
983		-
984		- [X86] When used with no options the early console is
985		- determined by the ACPI SPCR table.
	1085	+ When used with no options, the early console is
	1086	+ determined by stdout-path property in device tree's
	1087	+ chosen node or the ACPI SPCR table if supported by
	1088	+ the platform.
986	1089
987	1090	cdns,<addr>[,options]
988	1091	Start an early, polled-mode console on a Cadence
..	..	@@ -1038,6 +1141,16 @@
1038	1141	specified address. The serial port must already be
1039	1142	setup and configured. Options are not yet supported.
1040	1143
	1144	+ rda,<addr>
	1145	+ Start an early, polled-mode console on a serial port
	1146	+ of an RDA Micro SoC, such as RDA8810PL, at the
	1147	+ specified address. The serial port must already be
	1148	+ setup and configured. Options are not yet supported.
	1149	+
	1150	+ sbi
	1151	+ Use RISC-V SBI (Supervisor Binary Interface) for early
	1152	+ console.
	1153	+
1041	1154	smh Use ARM semihosting calls for early console.
1042	1155
1043	1156	s3c2410,<addr>
..	..	@@ -1065,6 +1178,12 @@
1065	1178	A valid base address must be provided, and the serial
1066	1179	port must already be setup and configured.
1067	1180
	1181	+ ec_imx21,<addr>
	1182	+ ec_imx6q,<addr>
	1183	+ Start an early, polled-mode, output-only console on the
	1184	+ Freescale i.MX UART at the specified address. The UART
	1185	+ must already be setup and configured.
	1186	+
1068	1187	ar3700_uart,<addr>
1069	1188	Start an early, polled-mode console on the
1070	1189	Armada 3700 serial port at the specified
..	..	@@ -1077,9 +1196,21 @@
1077	1196	specified address. The serial port must already be
1078	1197	setup and configured. Options are not yet supported.
1079	1198
	1199	+ efifb,[options]
	1200	+ Start an early, unaccelerated console on the EFI
	1201	+ memory mapped framebuffer (if available). On cache
	1202	+ coherent non-x86 systems that use system memory for
	1203	+ the framebuffer, pass the 'ram' option so that it is
	1204	+ mapped with the correct attributes.
	1205	+
	1206	+ linflex,<addr>
	1207	+ Use early console provided by Freescale LINFlexD UART
	1208	+ serial driver for NXP S32V234 SoCs. A valid base
	1209	+ address must be provided, and the serial port must
	1210	+ already be setup and configured.
	1211	+
1080	1212	earlyprintk= [X86,SH,ARM,M68k,S390]
1081	1213	earlyprintk=vga
1082		- earlyprintk=efi
1083	1214	earlyprintk=sclp
1084	1215	earlyprintk=xen
1085	1216	earlyprintk=serial[,ttySn[,baudrate]]
..	..	@@ -1136,19 +1267,34 @@
1136	1267	This is designed to be used in conjunction with
1137	1268	the boot argument: earlyprintk=vga
1138	1269
	1270	+ This parameter works in place of the kgdboc parameter
	1271	+ but can only be used if the backing tty is available
	1272	+ very early in the boot process. For early debugging
	1273	+ via a serial port see kgdboc_earlycon instead.
	1274	+
1139	1275	edd= [EDD]
1140	1276	Format: {"off" \| "on" \| "skip[mbr]"}
1141	1277
1142	1278	efi= [EFI]
1143		- Format: { "old_map", "nochunk", "noruntime", "debug" }
1144		- old_map [X86-64]: switch to the old ioremap-based EFI
1145		- runtime services mapping. 32-bit still uses this one by
1146		- default.
	1279	+ Format: { "debug", "disable_early_pci_dma",
	1280	+ "nochunk", "noruntime", "nosoftreserve",
	1281	+ "novamap", "no_disable_early_pci_dma" }
	1282	+ debug: enable misc debug output.
	1283	+ disable_early_pci_dma: disable the busmaster bit on all
	1284	+ PCI bridges while in the EFI boot stub.
1147	1285	nochunk: disable reading files in "chunks" in the EFI
1148	1286	boot stub, as chunking can cause problems with some
1149	1287	firmware implementations.
1150	1288	noruntime : disable EFI runtime services support
1151		- debug: enable misc debug output
	1289	+ nosoftreserve: The EFI_MEMORY_SP (Specific Purpose)
	1290	+ attribute may cause the kernel to reserve the
	1291	+ memory range for a memory mapping driver to
	1292	+ claim. Specify efi=nosoftreserve to disable this
	1293	+ reservation and treat the memory by its base type
	1294	+ (i.e. EFI_CONVENTIONAL_MEMORY / "System RAM").
	1295	+ novamap: do not call SetVirtualAddressMap().
	1296	+ no_disable_early_pci_dma: Leave the busmaster bit set
	1297	+ on all PCI bridges while in the EFI boot stub
1152	1298
1153	1299	efi_no_storage_paranoia [EFI; X86]
1154	1300	Using this parameter you can use more than 50% of
..	..	@@ -1161,21 +1307,27 @@
1161	1307	updating original EFI memory map.
1162	1308	Region of memory which aa attribute is added to is
1163	1309	from ss to ss+nn.
	1310	+
1164	1311	If efi_fake_mem=2G@4G:0x10000,2G@0x10a0000000:0x10000
1165	1312	is specified, EFI_MEMORY_MORE_RELIABLE(0x10000)
1166	1313	attribute is added to range 0x100000000-0x180000000 and
1167	1314	0x10a0000000-0x1120000000.
1168	1315
	1316	+ If efi_fake_mem=8G@9G:0x40000 is specified, the
	1317	+ EFI_MEMORY_SP(0x40000) attribute is added to
	1318	+ range 0x240000000-0x43fffffff.
	1319	+
1169	1320	Using this parameter you can do debugging of EFI memmap
1170		- related feature. For example, you can do debugging of
	1321	+ related features. For example, you can do debugging of
1171	1322	Address Range Mirroring feature even if your box
1172		- doesn't support it.
	1323	+ doesn't support it, or mark specific memory as
	1324	+ "soft reserved".
1173	1325
1174	1326	efivar_ssdt= [EFI; X86] Name of an EFI variable that contains an SSDT
1175	1327	that is to be dynamically loaded by Linux. If there are
1176	1328	multiple variables with the same name but with different
1177	1329	vendor GUIDs, all of them will be loaded. See
1178		- Documentation/acpi/ssdt-overlays.txt for details.
	1330	+ Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1179	1331
1180	1332
1181	1333	eisa_irq_edge= [PARISC,HW]
..	..	@@ -1185,16 +1337,11 @@
1185	1337	See comment before function elanfreq_setup() in
1186	1338	arch/x86/kernel/cpu/cpufreq/elanfreq.c.
1187	1339
1188		- elevator= [IOSCHED]
1189		- Format: {"cfq" \| "deadline" \| "noop"}
1190		- See Documentation/block/cfq-iosched.txt and
1191		- Documentation/block/deadline-iosched.txt for details.
1192		-
1193	1340	elfcorehdr=[size[KMG]@]offset[KMG] [IA64,PPC,SH,X86,S390]
1194	1341	Specifies physical address of start of kernel core
1195	1342	image elf header and optionally the size. Generally
1196	1343	kexec loader will pass this option to capture kernel.
1197		- See Documentation/kdump/kdump.txt for details.
	1344	+ See Documentation/admin-guide/kdump/kdump.rst for details.
1198	1345
1199	1346	enable_mtrr_cleanup [X86]
1200	1347	The kernel tries to adjust MTRR layout from continuous
..	..	@@ -1213,7 +1360,8 @@
1213	1360	0 -- permissive (log only, no denials).
1214	1361	1 -- enforcing (deny and log).
1215	1362	Default value is 0.
1216		- Value can be changed at runtime via /selinux/enforce.
	1363	+ Value can be changed at runtime via
	1364	+ /sys/fs/selinux/enforce.
1217	1365
1218	1366	erst_disable [ACPI]
1219	1367	Disable Error Record Serialization Table (ERST)
..	..	@@ -1229,14 +1377,20 @@
1229	1377	current integrity status.
1230	1378
1231	1379	failslab=
	1380	+ fail_usercopy=
1232	1381	fail_page_alloc=
1233	1382	fail_make_request=[KNL]
1234	1383	General fault injection mechanism.
1235	1384	Format: <interval>,<probability>,<space>,<times>
1236	1385	See also Documentation/fault-injection/.
1237	1386
	1387	+ fb_tunnels= [NET]
	1388	+ Format: { initns \| none }
	1389	+ See Documentation/admin-guide/sysctl/net.rst for
	1390	+ fb_tunnels_only_for_init_ns
	1391	+
1238	1392	floppy= [HW]
1239		- See Documentation/blockdev/floppy.txt.
	1393	+ See Documentation/admin-guide/blockdev/floppy.rst.
1240	1394
1241	1395	force_pal_cache_flush
1242	1396	[IA-64] Avoid check_sal_cache_flush which may hang on
..	..	@@ -1295,6 +1449,29 @@
1295	1449	can be changed at run time by the max_graph_depth file
1296	1450	in the tracefs tracing directory. default: 0 (no limit)
1297	1451
	1452	+ fw_devlink= [KNL] Create device links between consumer and supplier
	1453	+ devices by scanning the firmware to infer the
	1454	+ consumer/supplier relationships. This feature is
	1455	+ especially useful when drivers are loaded as modules as
	1456	+ it ensures proper ordering of tasks like device probing
	1457	+ (suppliers first, then consumers), supplier boot state
	1458	+ clean up (only after all consumers have probed),
	1459	+ suspend/resume & runtime PM (consumers first, then
	1460	+ suppliers).
	1461	+ Format: { off \| permissive \| on \| rpm }
	1462	+ off -- Don't create device links from firmware info.
	1463	+ permissive -- Create device links from firmware info
	1464	+ but use it only for ordering boot state clean
	1465	+ up (sync_state() calls).
	1466	+ on -- Create device links from firmware info and use it
	1467	+ to enforce probe and suspend/resume ordering.
	1468	+ rpm -- Like "on", but also use to order runtime PM.
	1469	+
	1470	+ fw_devlink.strict=<bool>
	1471	+ [KNL] Treat all inferred dependencies as mandatory
	1472	+ dependencies. This only applies for fw_devlink=on\|rpm.
	1473	+ Format: <bool>
	1474	+
1298	1475	gamecon.map[2\|3]=
1299	1476	[HW,JOY] Multisystem joystick and NES/SNES/PSX pad
1300	1477	support via parallel port (up to 5 devices per port)
..	..	@@ -1303,9 +1480,29 @@
1303	1480
1304	1481	gamma= [HW,DRM]
1305	1482
1306		- gart_fix_e820= [X86_64] disable the fix e820 for K8 GART
	1483	+ gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1307	1484	Format: off \| on
1308	1485	default: on
	1486	+
	1487	+ gather_data_sampling=
	1488	+ [X86,INTEL] Control the Gather Data Sampling (GDS)
	1489	+ mitigation.
	1490	+
	1491	+ Gather Data Sampling is a hardware vulnerability which
	1492	+ allows unprivileged speculative access to data which was
	1493	+ previously stored in vector registers.
	1494	+
	1495	+ This issue is mitigated by default in updated microcode.
	1496	+ The mitigation may have a performance impact but can be
	1497	+ disabled. On systems without the microcode mitigation
	1498	+ disabling AVX serves as a mitigation.
	1499	+
	1500	+ force: Disable AVX to mitigate systems without
	1501	+ microcode mitigation. No effect if the microcode
	1502	+ mitigation is present. Known to cause crashes in
	1503	+ userspace with buggy AVX enumeration.
	1504	+
	1505	+ off: Disable GDS mitigation.
1309	1506
1310	1507	gcov_persist= [GCOV] When non-zero (default), profiling data for
1311	1508	kernel modules is saved and remains accessible via
..	..	@@ -1347,7 +1544,7 @@
1347	1544	hardlockup_all_cpu_backtrace=
1348	1545	[KNL] Should the hard-lockup detector generate
1349	1546	backtraces on all cpus.
1350		- Format: <integer>
	1547	+ Format: 0 \| 1
1351	1548
1352	1549	hashdist= [KNL,NUMA] Large hashes allocated during boot
1353	1550	are distributed across NUMA nodes. Defaults on
..	..	@@ -1373,9 +1570,6 @@
1373	1570	Valid parameters: "on", "off"
1374	1571	Default: "on"
1375	1572
1376		- hisax= [HW,ISDN]
1377		- See Documentation/isdn/README.HiSax.
1378		-
1379	1573	hlt [BUGS=ARM,SH]
1380	1574
1381	1575	hpet= [X86-32,HPET] option to control HPET usage
..	..	@@ -1389,19 +1583,38 @@
1389	1583	hpet_mmap= [X86, HPET_MMAP] Allow userspace to mmap HPET
1390	1584	registers. Default set by CONFIG_HPET_MMAP_DEFAULT.
1391	1585
1392		- hugepages= [HW,X86-32,IA-64] HugeTLB pages to allocate at boot.
1393		- hugepagesz= [HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.
1394		- On x86-64 and powerpc, this option can be specified
1395		- multiple times interleaved with hugepages= to reserve
1396		- huge pages of different sizes. Valid pages sizes on
1397		- x86-64 are 2M (when the CPU supports "pse") and 1G
1398		- (when the CPU supports the "pdpe1gb" cpuinfo flag).
	1586	+ hugetlb_cma= [HW] The size of a cma area used for allocation
	1587	+ of gigantic hugepages.
	1588	+ Format: nn[KMGTPE]
	1589	+
	1590	+ Reserve a cma area of given size and allocate gigantic
	1591	+ hugepages using the cma allocator. If enabled, the
	1592	+ boot-time allocation of gigantic hugepages is skipped.
	1593	+
	1594	+ hugepages= [HW] Number of HugeTLB pages to allocate at boot.
	1595	+ If this follows hugepagesz (below), it specifies
	1596	+ the number of pages of hugepagesz to be allocated.
	1597	+ If this is the first HugeTLB parameter on the command
	1598	+ line, it specifies the number of pages to allocate for
	1599	+ the default huge page size. See also
	1600	+ Documentation/admin-guide/mm/hugetlbpage.rst.
	1601	+ Format: <integer>
	1602	+
	1603	+ hugepagesz=
	1604	+ [HW] The size of the HugeTLB pages. This is used in
	1605	+ conjunction with hugepages (above) to allocate huge
	1606	+ pages of a specific size at boot. The pair
	1607	+ hugepagesz=X hugepages=Y can be specified once for
	1608	+ each supported huge page size. Huge page sizes are
	1609	+ architecture dependent. See also
	1610	+ Documentation/admin-guide/mm/hugetlbpage.rst.
	1611	+ Format: size[KMG]
1399	1612
1400	1613	hung_task_panic=
1401	1614	[KNL] Should the hung task detector generate panics.
1402		- Format: <integer>
	1615	+ Format: 0 \| 1
1403	1616
1404		- A nonzero value instructs the kernel to panic when a
	1617	+ A value of 1 instructs the kernel to panic when a
1405	1618	hung task is detected. The default value is controlled
1406	1619	by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1407	1620	option. The value selected by this boot parameter can
..	..	@@ -1412,6 +1625,15 @@
1412	1625	hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1413	1626	If specified, z/VM IUCV HVC accepts connections
1414	1627	from listed z/VM user IDs only.
	1628	+
	1629	+ hvc_dcc.enable= [ARM,ARM64] Enable DCC driver at runtime. For GKI,
	1630	+ disabled at runtime by default to prevent
	1631	+ crashes in devices which do not support DCC.
	1632	+
	1633	+ hv_nopvspin [X86,HYPER_V] Disables the paravirt spinlock optimizations
	1634	+ which allow the hypervisor to 'idle' the
	1635	+ guest on lock contention.
	1636	+
1415	1637	keep_bootcon [KNL]
1416	1638	Do not unregister boot console at start. This is only
1417	1639	useful for debugging when something happens in the window
..	..	@@ -1489,7 +1711,7 @@
1489	1711	Format: =0.0 to prevent dma on hda, =0.1 hdb =1.0 hdc
1490	1712	.vlb_clock .pci_clock .noflush .nohpa .noprobe .nowerr
1491	1713	.cdrom .chs .ignore_cable are additional options
1492		- See Documentation/ide/ide.txt.
	1714	+ See Documentation/ide/ide.rst.
1493	1715
1494	1716	ide-generic.probe-mask= [HW] (E)IDE subsystem
1495	1717	Format: <int>
..	..	@@ -1570,7 +1792,7 @@
1570	1792	Format: { "off" \| "enforce" \| "fix" \| "log" }
1571	1793	default: "enforce"
1572	1794
1573		- ima_appraise_tcb [IMA]
	1795	+ ima_appraise_tcb [IMA] Deprecated. Use ima_policy= instead.
1574	1796	The builtin appraise policy appraises all files
1575	1797	owned by uid=0.
1576	1798
..	..	@@ -1597,8 +1819,7 @@
1597	1819	uid=0.
1598	1820
1599	1821	The "appraise_tcb" policy appraises the integrity of
1600		- all files owned by root. (This is the equivalent
1601		- of ima_appraise_tcb.)
	1822	+ all files owned by root.
1602	1823
1603	1824	The "secure_boot" policy appraises the integrity
1604	1825	of files (eg. kexec kernel image, kernel modules,
..	..	@@ -1656,6 +1877,13 @@
1656	1877
1657	1878	initrd= [BOOT] Specify the location of the initial ramdisk
1658	1879
	1880	+ initrdmem= [KNL] Specify a physical address and size from which to
	1881	+ load the initrd. If an initrd is compiled in or
	1882	+ specified in the bootparams, it takes priority over this
	1883	+ setting.
	1884	+ Format: ss[KMG],nn[KMG]
	1885	+ Default is 0, 0
	1886	+
1659	1887	init_on_alloc= [MM] Fill newly allocated pages and heap objects with
1660	1888	zeroes.
1661	1889	Format: 0 \| 1
..	..	@@ -1665,7 +1893,7 @@
1665	1893	Format: 0 \| 1
1666	1894	Default set by CONFIG_INIT_ON_FREE_DEFAULT_ON.
1667	1895
1668		- init_pkru= [x86] Specify the default memory protection keys rights
	1896	+ init_pkru= [X86] Specify the default memory protection keys rights
1669	1897	register contents for all processes. 0x55555554 by
1670	1898	default (disallow access to all but pkey 0). Can
1671	1899	override in debugfs after boot.
..	..	@@ -1673,7 +1901,7 @@
1673	1901	inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver
1674	1902	Format: <irq>
1675	1903
1676		- int_pln_enable [x86] Enable power limit notification interrupt
	1904	+ int_pln_enable [X86] Enable power limit notification interrupt
1677	1905
1678	1906	integrity_audit=[IMA]
1679	1907	Format: { "0" \| "1" }
..	..	@@ -1691,7 +1919,7 @@
1691	1919	bypassed by not enabling DMAR with this option. In
1692	1920	this case, gfx device will use physical address for
1693	1921	DMA.
1694		- forcedac [x86_64]
	1922	+ forcedac [X86-64]
1695	1923	With this option iommu will not optimize to look
1696	1924	for io virtual address below 32-bit forcing dual
1697	1925	address cycle on pci bus for cards supporting greater
..	..	@@ -1706,12 +1934,11 @@
1706	1934	By default, super page will be supported if Intel IOMMU
1707	1935	has the capability. With this option, super page will
1708	1936	not be supported.
1709		- ecs_off [Default Off]
1710		- By default, extended context tables will be supported if
1711		- the hardware advertises that it has support both for the
1712		- extended tables themselves, and also PASID support. With
1713		- this option set, extended tables will not be used even
1714		- on hardware which claims to support them.
	1937	+ sm_on [Default Off]
	1938	+ By default, scalable mode will be disabled even if the
	1939	+ hardware advertises that it has support for the scalable
	1940	+ mode translation. With this option set, scalable mode
	1941	+ will be used on hardware which claims to support it.
1715	1942	tboot_noforce [Default Off]
1716	1943	Do not force the Intel IOMMU enabled under tboot.
1717	1944	By default, tboot will force Intel IOMMU on, which
..	..	@@ -1721,6 +1948,11 @@
1721	1948	Note that using this option lowers the security
1722	1949	provided by tboot because it makes the system
1723	1950	vulnerable to DMA attacks.
	1951	+ nobounce [Default off]
	1952	+ Disable bounce buffer for untrusted devices such as
	1953	+ the Thunderbolt devices. This will treat the untrusted
	1954	+ devices as the trusted ones, hence might expose security
	1955	+ risks of DMA attacks.
1724	1956
1725	1957	intel_idle.max_cstate= [KNL,HW,ACPI,X86]
1726	1958	0 disables intel_idle and fall back on acpi_idle.
..	..	@@ -1772,7 +2004,7 @@
1772	2004	strict regions from userspace.
1773	2005	relaxed
1774	2006
1775		- iommu= [x86]
	2007	+ iommu= [X86]
1776	2008	off
1777	2009	force
1778	2010	noforce
..	..	@@ -1782,19 +2014,31 @@
1782	2014	merge
1783	2015	nomerge
1784	2016	soft
1785		- pt [x86]
1786		- nopt [x86]
	2017	+ pt [X86]
	2018	+ nopt [X86]
1787	2019	nobypass [PPC/POWERNV]
1788	2020	Disable IOMMU bypass, using IOMMU for PCI devices.
1789	2021
	2022	+ iommu.strict= [ARM64] Configure TLB invalidation behaviour
	2023	+ Format: { "0" \| "1" }
	2024	+ 0 - Lazy mode.
	2025	+ Request that DMA unmap operations use deferred
	2026	+ invalidation of hardware TLBs, for increased
	2027	+ throughput at the cost of reduced device isolation.
	2028	+ Will fall back to strict mode if not supported by
	2029	+ the relevant IOMMU driver.
	2030	+ 1 - Strict mode (default).
	2031	+ DMA unmap operations invalidate IOMMU hardware TLBs
	2032	+ synchronously.
	2033	+
1790	2034	iommu.passthrough=
1791		- [ARM64] Configure DMA to bypass the IOMMU by default.
	2035	+ [ARM64, X86] Configure DMA to bypass the IOMMU by default.
1792	2036	Format: { "0" \| "1" }
1793	2037	0 - Use IOMMU translation for DMA.
1794	2038	1 - Bypass the IOMMU for DMA.
1795		- unset - Use IOMMU translation for DMA.
	2039	+ unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
1796	2040
1797		- io7= [HW] IO7 for Marvel based alpha systems
	2041	+ io7= [HW] IO7 for Marvel-based Alpha systems
1798	2042	See comment before marvel_specify_io7 in
1799	2043	arch/alpha/kernel/core_marvel.c.
1800	2044
..	..	@@ -1809,7 +2053,10 @@
1809	2053	No delay
1810	2054
1811	2055	ip= [IP_PNP]
1812		- See Documentation/filesystems/nfs/nfsroot.txt.
	2056	+ See Documentation/admin-guide/nfs/nfsroot.rst.
	2057	+
	2058	+ ipcmni_extend [KNL] Extend the maximum number of unique System V
	2059	+ IPC identifiers from 32,768 to 16,777,216.
1813	2060
1814	2061	irqaffinity= [SMP] Set the default irq affinity mask
1815	2062	The argument is a cpu list, as described above.
..	..	@@ -1828,6 +2075,11 @@
1828	2075	that use the kernel as a bootloader, and thus want
1829	2076	to let secondary kernels in charge of setting up
1830	2077	LPIs.
	2078	+
	2079	+ irqchip.gicv3_pseudo_nmi= [ARM64]
	2080	+ Enables support for pseudo-NMIs in the kernel. This
	2081	+ requires the kernel to be built with
	2082	+ CONFIG_ARM64_PSEUDO_NMI.
1831	2083
1832	2084	irqfixup [HW]
1833	2085	When an interrupt is not handled search all handlers
..	..	@@ -1878,32 +2130,87 @@
1878	2130	<cpu number> begins at 0 and the maximum value is
1879	2131	"number of CPUs in system - 1".
1880	2132
	2133	+ managed_irq
	2134	+
	2135	+ Isolate from being targeted by managed interrupts
	2136	+ which have an interrupt mask containing isolated
	2137	+ CPUs. The affinity of managed interrupts is
	2138	+ handled by the kernel and cannot be changed via
	2139	+ the /proc/irq/* interfaces.
	2140	+
	2141	+ This isolation is best effort and only effective
	2142	+ if the automatically assigned interrupt mask of a
	2143	+ device queue contains isolated and housekeeping
	2144	+ CPUs. If housekeeping CPUs are online then such
	2145	+ interrupts are directed to the housekeeping CPU
	2146	+ so that IO submitted on the housekeeping CPU
	2147	+ cannot disturb the isolated CPU.
	2148	+
	2149	+ If a queue's affinity mask contains only isolated
	2150	+ CPUs then this parameter has no effect on the
	2151	+ interrupt routing decision, though interrupts are
	2152	+ only delivered when tasks running on those
	2153	+ isolated CPUs submit IO. IO submitted on
	2154	+ housekeeping CPUs has no influence on those
	2155	+ queues.
	2156	+
1881	2157	The format of <cpu-list> is described above.
1882		-
1883		-
1884	2158
1885	2159	iucv= [HW,NET]
1886	2160
1887		- ivrs_ioapic [HW,X86_64]
	2161	+ ivrs_ioapic [HW,X86-64]
1888	2162	Provide an override to the IOAPIC-ID<->DEVICE-ID
1889		- mapping provided in the IVRS ACPI table. For
1890		- example, to map IOAPIC-ID decimal 10 to
1891		- PCI device 00:14.0 write the parameter as:
	2163	+ mapping provided in the IVRS ACPI table.
	2164	+ By default, PCI segment is 0, and can be omitted.
	2165	+
	2166	+ For example, to map IOAPIC-ID decimal 10 to
	2167	+ PCI segment 0x1 and PCI device 00:14.0,
	2168	+ write the parameter as:
	2169	+ ivrs_ioapic=10@0001:00:14.0
	2170	+
	2171	+ Deprecated formats:
	2172	+ * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
	2173	+ write the parameter as:
1892	2174	ivrs_ioapic[10]=00:14.0
	2175	+ * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
	2176	+ PCI device 00:14.0 write the parameter as:
	2177	+ ivrs_ioapic[10]=0001:00:14.0
1893	2178
1894		- ivrs_hpet [HW,X86_64]
	2179	+ ivrs_hpet [HW,X86-64]
1895	2180	Provide an override to the HPET-ID<->DEVICE-ID
1896		- mapping provided in the IVRS ACPI table. For
1897		- example, to map HPET-ID decimal 0 to
1898		- PCI device 00:14.0 write the parameter as:
1899		- ivrs_hpet[0]=00:14.0
	2181	+ mapping provided in the IVRS ACPI table.
	2182	+ By default, PCI segment is 0, and can be omitted.
1900	2183
1901		- ivrs_acpihid [HW,X86_64]
	2184	+ For example, to map HPET-ID decimal 10 to
	2185	+ PCI segment 0x1 and PCI device 00:14.0,
	2186	+ write the parameter as:
	2187	+ ivrs_hpet=10@0001:00:14.0
	2188	+
	2189	+ Deprecated formats:
	2190	+ * To map HPET-ID decimal 0 to PCI device 00:14.0
	2191	+ write the parameter as:
	2192	+ ivrs_hpet[0]=00:14.0
	2193	+ * To map HPET-ID decimal 10 to PCI segment 0x1 and
	2194	+ PCI device 00:14.0 write the parameter as:
	2195	+ ivrs_ioapic[10]=0001:00:14.0
	2196	+
	2197	+ ivrs_acpihid [HW,X86-64]
1902	2198	Provide an override to the ACPI-HID:UID<->DEVICE-ID
1903		- mapping provided in the IVRS ACPI table. For
1904		- example, to map UART-HID:UID AMD0020:0 to
1905		- PCI device 00:14.5 write the parameter as:
	2199	+ mapping provided in the IVRS ACPI table.
	2200	+ By default, PCI segment is 0, and can be omitted.
	2201	+
	2202	+ For example, to map UART-HID:UID AMD0020:0 to
	2203	+ PCI segment 0x1 and PCI device ID 00:14.5,
	2204	+ write the parameter as:
	2205	+ ivrs_acpihid=AMD0020:0@0001:00:14.5
	2206	+
	2207	+ Deprecated formats:
	2208	+ * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
	2209	+ PCI device ID 00:14.5, write the parameter as:
1906	2210	ivrs_acpihid[00:14.5]=AMD0020:0
	2211	+ * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
	2212	+ PCI device ID 00:14.5, write the parameter as:
	2213	+ ivrs_acpihid[0001:00:14.5]=AMD0020:0
1907	2214
1908	2215	js= [HW,JOY] Analog joystick
1909	2216	See Documentation/input/joydev/joystick.rst.
..	..	@@ -1967,10 +2274,25 @@
1967	2274	kms, kbd format: kms,kbd
1968	2275	kms, kbd and serial format: kms,kbd,<ser_dev>[,baud]
1969	2276
	2277	+ kgdboc_earlycon= [KGDB,HW]
	2278	+ If the boot console provides the ability to read
	2279	+ characters and can work in polling mode, you can use
	2280	+ this parameter to tell kgdb to use it as a backend
	2281	+ until the normal console is registered. Intended to
	2282	+ be used together with the kgdboc parameter which
	2283	+ specifies the normal console to transition to.
	2284	+
	2285	+ The name of the early console should be specified
	2286	+ as the value of this parameter. Note that the name of
	2287	+ the early console might be different than the tty
	2288	+ name passed to kgdboc. It's OK to leave the value
	2289	+ blank and the first boot console that implements
	2290	+ read() will be picked.
	2291	+
1970	2292	kgdbwait [KGDB] Stop kernel execution and enter the
1971	2293	kernel debugger at the earliest opportunity.
1972	2294
1973		- kmac= [MIPS] korina ethernet MAC address.
	2295	+ kmac= [MIPS] Korina ethernet MAC address.
1974	2296	Configure the RouterBoard 532 series on-chip
1975	2297	Ethernet adapter MAC address.
1976	2298
..	..	@@ -1979,6 +2301,19 @@
1979	2301	Default: on
1980	2302	Built with CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y,
1981	2303	the default is off.
	2304	+
	2305	+ kprobe_event=[probe-list]
	2306	+ [FTRACE] Add kprobe events and enable at boot time.
	2307	+ The probe-list is a semicolon delimited list of probe
	2308	+ definitions. Each definition is same as kprobe_events
	2309	+ interface, but the parameters are comma delimited.
	2310	+ For example, to add a kprobe event on vfs_read with
	2311	+ arg1 and arg2, add to the command line;
	2312	+
	2313	+ kprobe_event=p,vfs_read,$arg1,$arg2
	2314	+
	2315	+ See also Documentation/trace/kprobetrace.rst "Kernel
	2316	+ Boot Parameter" section.
1982	2317
1983	2318	kpti= [ARM64] Control page table isolation of user
1984	2319	and kernel address spaces.
..	..	@@ -2022,6 +2357,21 @@
2022	2357	for all guests.
2023	2358	Default is 1 (enabled) if in 64-bit or 32-bit PAE mode.
2024	2359
	2360	+ kvm-arm.mode=
	2361	+ [KVM,ARM] Select one of KVM/arm64's modes of operation.
	2362	+
	2363	+ none: Forcefully disable KVM.
	2364	+
	2365	+ nvhe: Standard nVHE-based mode, without support for
	2366	+ protected guests.
	2367	+
	2368	+ protected: nVHE-based mode with support for guests whose
	2369	+ state is kept private from the host.
	2370	+ Not valid if the kernel is running in EL2.
	2371	+
	2372	+ Defaults to VHE/nVHE based on hardware support and
	2373	+ the value of CONFIG_ARM64_VHE.
	2374	+
2025	2375	kvm-arm.vgic_v3_group0_trap=
2026	2376	[KVM,ARM] Trap guest accesses to GICv3 group-0
2027	2377	system registers
..	..	@@ -2037,6 +2387,14 @@
2037	2387	kvm-arm.vgic_v4_enable=
2038	2388	[KVM,ARM] Allow use of GICv4 for direct injection of
2039	2389	LPIs.
	2390	+
	2391	+ kvm_cma_resv_ratio=n [PPC]
	2392	+ Reserves given percentage from system memory area for
	2393	+ contiguous memory allocation for KVM hash pagetable
	2394	+ allocation.
	2395	+ By default it reserves 5% of total system memory.
	2396	+ Format: <integer>
	2397	+ Default: 5
2040	2398
2041	2399	kvm-intel.ept= [KVM,Intel] Disable extended page tables
2042	2400	(virtualized MMU) support on capable Intel chips.
..	..	@@ -2151,9 +2509,10 @@
2151	2509	lapic [X86-32,APIC] Enable the local APIC even if BIOS
2152	2510	disabled it.
2153	2511
2154		- lapic= [x86,APIC] "notscdeadline" Do not use TSC deadline
	2512	+ lapic= [X86,APIC] Do not use TSC deadline
2155	2513	value for LAPIC timer one-shot implementation. Default
2156	2514	back to the programmable timer unit in the LAPIC.
	2515	+ Format: notscdeadline
2157	2516
2158	2517	lapic_timer_c2_ok [X86,APIC] trust the local apic timer
2159	2518	in C2 power state.
..	..	@@ -2225,8 +2584,13 @@
2225	2584
2226	2585	memblock=debug [KNL] Enable memblock debug messages.
2227	2586
2228		- load_ramdisk= [RAM] List of ramdisks to load from floppy
2229		- See Documentation/blockdev/ramdisk.txt.
	2587	+ android12_only.will_be_removed_soon.memblock_nomap_remove= [KNL]
	2588	+ Setting this to true through kernel command line will
	2589	+ call memblock_remove on the regions marked with no-map
	2590	+ property thereby saving memory by removing page structs
	2591	+ for those regions. By default this is set to false.
	2592	+
	2593	+ load_ramdisk= [RAM] [Deprecated]
2230	2594
2231	2595	lockd.nlm_grace_period=P [NFS] Assign grace period.
2232	2596	Format: <integer>
..	..	@@ -2239,6 +2603,15 @@
2239	2603
2240	2604	lockd.nlm_udpport=M [NFS] Assign UDP port.
2241	2605	Format: <integer>
	2606	+
	2607	+ lockdown= [SECURITY]
	2608	+ { integrity \| confidentiality }
	2609	+ Enable the kernel lockdown feature. If set to
	2610	+ integrity, kernel features that allow userland to
	2611	+ modify the running kernel are disabled. If set to
	2612	+ confidentiality, kernel features that allow userland
	2613	+ to extract confidential information from the kernel
	2614	+ are also disabled.
2242	2615
2243	2616	locktorture.nreaders_stress= [KNL]
2244	2617	Set the number of locking read-acquisition kthreads.
..	..	@@ -2344,12 +2717,18 @@
2344	2717	ltpc= [NET]
2345	2718	Format: <io>,<irq>,<dma>
2346	2719
	2720	+ lsm.debug [SECURITY] Enable LSM initialization debugging output.
	2721	+
	2722	+ lsm=lsm1,...,lsmN
	2723	+ [SECURITY] Choose order of LSM initialization. This
	2724	+ overrides CONFIG_LSM, and the "security=" parameter.
	2725	+
2347	2726	machvec= [IA-64] Force the use of a particular machine-vector
2348	2727	(machvec) in a generic kernel.
2349		- Example: machvec=hpzx1_swiotlb
	2728	+ Example: machvec=hpzx1
2350	2729
2351		- machtype= [Loongson] Share the same kernel image file between different
2352		- yeeloong laptop.
	2730	+ machtype= [Loongson] Share the same kernel image file between
	2731	+ different yeeloong laptops.
2353	2732	Example: machtype=lemote-yeeloong-2f-7inch
2354	2733
2355	2734	max_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory greater
..	..	@@ -2373,7 +2752,7 @@
2373	2752
2374	2753	mce [X86-32] Machine Check Exception
2375	2754
2376		- mce=option [X86-64] See Documentation/x86/x86_64/boot-options.txt
	2755	+ mce=option [X86-64] See Documentation/x86/x86_64/boot-options.rst
2377	2756
2378	2757	md= [HW] RAID subsystems devices and level
2379	2758	See Documentation/admin-guide/md.rst.
..	..	@@ -2415,12 +2794,21 @@
2415	2794	For details see: Documentation/admin-guide/hw-vuln/mds.rst
2416	2795
2417	2796	mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory
2418		- Amount of memory to be used when the kernel is not able
2419		- to see the whole system memory or for test.
	2797	+ Amount of memory to be used in cases as follows:
	2798	+
	2799	+ 1 for test;
	2800	+ 2 when the kernel is not able to see the whole system memory;
	2801	+ 3 memory that lies after 'mem=' boundary is excluded from
	2802	+ the hypervisor, then assigned to KVM guests.
	2803	+
2420	2804	[X86] Work as limiting max address. Use together
2421	2805	with memmap= to avoid physical address space collisions.
2422	2806	Without memmap= PCI devices could be placed at addresses
2423	2807	belonging to unused RAM.
	2808	+
	2809	+ Note that this only takes effects during boot time since
	2810	+ in above case 3, memory may need be hot added after boot
	2811	+ if system memory of hypervisor is not sufficient.
2424	2812
2425	2813	mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
2426	2814	memory.
..	..	@@ -2435,7 +2823,7 @@
2435	2823	set according to the
2436	2824	CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE kernel config
2437	2825	option.
2438		- See Documentation/memory-hotplug.txt.
	2826	+ See Documentation/admin-guide/mm/memory-hotplug.rst.
2439	2827
2440	2828	memmap=exactmap [KNL,X86] Enable setting of an exact
2441	2829	E820 memory map, as specified by the user.
..	..	@@ -2506,7 +2894,7 @@
2506	2894	seconds. Use this parameter to check at some
2507	2895	other rate. 0 disables periodic checking.
2508	2896
2509		- memtest= [KNL,X86,ARM] Enable memtest
	2897	+ memtest= [KNL,X86,ARM,PPC] Enable memtest
2510	2898	Format: <integer>
2511	2899	default : 0 <disable>
2512	2900	Specifies the number of memtest passes to be
..	..	@@ -2524,7 +2912,7 @@
2524	2912	mem_encrypt=on: Activate SME
2525	2913	mem_encrypt=off: Do not activate SME
2526	2914
2527		- Refer to Documentation/x86/amd-memory-encryption.txt
	2915	+ Refer to Documentation/virt/kvm/amd-memory-encryption.rst
2528	2916	for details on when memory encryption can be activated.
2529	2917
2530	2918	mem_sleep_default= [SUSPEND] Default system suspend mode:
..	..	@@ -2534,7 +2922,7 @@
2534	2922	See Documentation/admin-guide/pm/sleep-states.rst.
2535	2923
2536	2924	meye.*= [HW] Set MotionEye Camera parameters
2537		- See Documentation/media/v4l-drivers/meye.rst.
	2925	+ See Documentation/admin-guide/media/meye.rst.
2538	2926
2539	2927	mfgpt_irq= [IA-32] Specify the IRQ to use for the
2540	2928	Multi-Function General Purpose Timers on AMD Geode
..	..	@@ -2569,7 +2957,7 @@
2569	2957	touchscreen support is not enabled in the mainstream
2570	2958	kernel as of 2.6.30, a preliminary port can be found
2571	2959	in the "bleeding edge" mini2440 support kernel at
2572		- http://repo.or.cz/w/linux-2.6/mini2440.git
	2960	+ https://repo.or.cz/w/linux-2.6/mini2440.git
2573	2961
2574	2962	mitigations=
2575	2963	[X86,PPC,S390,ARM64] Control optional mitigations for
..	..	@@ -2581,21 +2969,23 @@
2581	2969	Disable all optional CPU mitigations. This
2582	2970	improves system performance, but it may also
2583	2971	expose users to several CPU vulnerabilities.
2584		- Equivalent to: nopti [X86,PPC]
	2972	+ Equivalent to: gather_data_sampling=off [X86]
2585	2973	kpti=0 [ARM64]
2586		- nospectre_v1 [PPC]
2587		- nobp=0 [S390]
2588		- nospectre_v1 [X86]
2589		- nospectre_v2 [X86,PPC,S390,ARM64]
2590		- spectre_v2_user=off [X86]
2591		- spec_store_bypass_disable=off [X86,PPC]
2592		- ssbd=force-off [ARM64]
	2974	+ kvm.nx_huge_pages=off [X86]
2593	2975	l1tf=off [X86]
2594	2976	mds=off [X86]
2595		- tsx_async_abort=off [X86]
2596		- kvm.nx_huge_pages=off [X86]
	2977	+ mmio_stale_data=off [X86]
2597	2978	no_entry_flush [PPC]
2598	2979	no_uaccess_flush [PPC]
	2980	+ nobp=0 [S390]
	2981	+ nopti [X86,PPC]
	2982	+ nospectre_v1 [X86,PPC]
	2983	+ nospectre_v2 [X86,PPC,S390,ARM64]
	2984	+ retbleed=off [X86]
	2985	+ spec_store_bypass_disable=off [X86,PPC]
	2986	+ spectre_v2_user=off [X86]
	2987	+ ssbd=force-off [ARM64]
	2988	+ tsx_async_abort=off [X86]
2599	2989
2600	2990	Exceptions:
2601	2991	This does not have any effect on
..	..	@@ -2617,6 +3007,8 @@
2617	3007	Equivalent to: l1tf=flush,nosmt [X86]
2618	3008	mds=full,nosmt [X86]
2619	3009	tsx_async_abort=full,nosmt [X86]
	3010	+ mmio_stale_data=full,nosmt [X86]
	3011	+ retbleed=auto,nosmt [X86]
2620	3012
2621	3013	mminit_loglevel=
2622	3014	[KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this
..	..	@@ -2625,6 +3017,40 @@
2625	3017	of 0 disables mminit logging and a level of 4 will
2626	3018	log everything. Information is printed at KERN_DEBUG
2627	3019	so loglevel=8 may also need to be specified.
	3020	+
	3021	+ mmio_stale_data=
	3022	+ [X86,INTEL] Control mitigation for the Processor
	3023	+ MMIO Stale Data vulnerabilities.
	3024	+
	3025	+ Processor MMIO Stale Data is a class of
	3026	+ vulnerabilities that may expose data after an MMIO
	3027	+ operation. Exposed data could originate or end in
	3028	+ the same CPU buffers as affected by MDS and TAA.
	3029	+ Therefore, similar to MDS and TAA, the mitigation
	3030	+ is to clear the affected CPU buffers.
	3031	+
	3032	+ This parameter controls the mitigation. The
	3033	+ options are:
	3034	+
	3035	+ full - Enable mitigation on vulnerable CPUs
	3036	+
	3037	+ full,nosmt - Enable mitigation and disable SMT on
	3038	+ vulnerable CPUs.
	3039	+
	3040	+ off - Unconditionally disable mitigation
	3041	+
	3042	+ On MDS or TAA affected machines,
	3043	+ mmio_stale_data=off can be prevented by an active
	3044	+ MDS or TAA mitigation as these vulnerabilities are
	3045	+ mitigated with the same mechanism so in order to
	3046	+ disable this mitigation, you need to specify
	3047	+ mds=off and tsx_async_abort=off too.
	3048	+
	3049	+ Not specifying this option is equivalent to
	3050	+ mmio_stale_data=full.
	3051	+
	3052	+ For details see:
	3053	+ Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
2628	3054
2629	3055	module.sig_enforce
2630	3056	[KNL] When CONFIG_MODULE_SIG is set, this means that
..	..	@@ -2670,11 +3096,31 @@
2670	3096	<name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
2671	3097
2672	3098	mtdparts= [MTD]
2673		- See drivers/mtd/cmdlinepart.c.
	3099	+ See drivers/mtd/parsers/cmdlinepart.c
2674	3100
2675	3101	multitce=off [PPC] This parameter disables the use of the pSeries
2676	3102	firmware feature for updating multiple TCE entries
2677	3103	at a time.
	3104	+
	3105	+ kswapd_per_node=
	3106	+ kswapd_per_node allows you to control the number of kswapd threads
	3107	+ running on the system. This provides the ability to devote additional
	3108	+ CPU resources toward proactive page replacement with the goal of
	3109	+ reducing direct reclaims. When direct reclaims are prevented, the CPU
	3110	+ consumed by them is prevented as well. Depending on the workload, the
	3111	+ result can cause aggregate CPU usage on the system to go up, down or
	3112	+ stay the same.
	3113	+
	3114	+ More aggressive page replacement can reduce direct reclaims which
	3115	+ cause latency for tasks and decrease throughput when doing filesystem
	3116	+ IO through the pagecache. Direct reclaims are recorded using the
	3117	+ allocstall counter in /proc/vmstat.
	3118	+
	3119	+ The range of acceptible values are 1-16. Always start with lower
	3120	+ values in the 2-6 range. Higher values should be justified with
	3121	+ testing. If direct reclaims occur in spite of high values, the cost
	3122	+ of direct reclaims (in latency) that occur can be higher due to
	3123	+ increased lock contention.
2678	3124
2679	3125	onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
2680	3126
..	..	@@ -2728,13 +3174,13 @@
2728	3174	Default value is 0.
2729	3175
2730	3176	nfsaddrs= [NFS] Deprecated. Use ip= instead.
2731		- See Documentation/filesystems/nfs/nfsroot.txt.
	3177	+ See Documentation/admin-guide/nfs/nfsroot.rst.
2732	3178
2733	3179	nfsroot= [NFS] nfs root filesystem for disk-less boxes.
2734		- See Documentation/filesystems/nfs/nfsroot.txt.
	3180	+ See Documentation/admin-guide/nfs/nfsroot.rst.
2735	3181
2736	3182	nfsrootdebug [NFS] enable nfsroot debugging messages.
2737		- See Documentation/filesystems/nfs/nfsroot.txt.
	3183	+ See Documentation/admin-guide/nfs/nfsroot.rst.
2738	3184
2739	3185	nfs.callback_nr_threads=
2740	3186	[NFSv4] set the total number of threads that the
..	..	@@ -2833,6 +3279,10 @@
2833	3279	and gids from such clients. This is intended to ease
2834	3280	migration from NFSv2/v3.
2835	3281
	3282	+ nmi_backtrace.backtrace_idle [KNL]
	3283	+ Dump stacks even of idle CPUs in response to an
	3284	+ NMI stack-backtrace request.
	3285	+
2836	3286	nmi_debug= [KNL,SH] Specify one or more actions to take
2837	3287	when a NMI is triggered.
2838	3288	Format: [state][,regs][,debounce][,die]
..	..	@@ -2843,8 +3293,9 @@
2843	3293	0 - turn hardlockup detector in nmi_watchdog off
2844	3294	1 - turn hardlockup detector in nmi_watchdog on
2845	3295	When panic is specified, panic when an NMI watchdog
2846		- timeout occurs (or 'nopanic' to override the opposite
2847		- default). To disable both hard and soft lockup detectors,
	3296	+ timeout occurs (or 'nopanic' to not panic on an NMI
	3297	+ watchdog, if CONFIG_BOOTPARAM_HARDLOCKUP_PANIC is set)
	3298	+ To disable both hard and soft lockup detectors,
2848	3299	please see 'nowatchdog'.
2849	3300	This is useful when you use a panic=... timeout and
2850	3301	need the box quickly up again.
..	..	@@ -2864,6 +3315,8 @@
2864	3315	no5lvl [X86-64] Disable 5-level paging mode. Forces
2865	3316	kernel to use 4-level paging instead.
2866	3317
	3318	+ nofsgsbase [X86] Disables FSGSBASE instructions.
	3319	+
2867	3320	no_console_suspend
2868	3321	[HW] Never suspend the console
2869	3322	Disable suspending of consoles during suspend and
..	..	@@ -2878,6 +3331,17 @@
2878	3331	it. Users could use console_suspend (usually
2879	3332	/sys/module/printk/parameters/console_suspend) to
2880	3333	turn on/off it dynamically.
	3334	+
	3335	+ novmcoredd [KNL,KDUMP]
	3336	+ Disable device dump. Device dump allows drivers to
	3337	+ append dump data to vmcore so you can collect driver
	3338	+ specified debug info. Drivers can append the data
	3339	+ without any limit and this data is stored in memory,
	3340	+ so this may cause significant memory stress. Disabling
	3341	+ device dump can help save memory but the driver debug
	3342	+ data will be no longer available. This parameter
	3343	+ is only available when CONFIG_PROC_VMCORE_DEVICE_DUMP
	3344	+ is set.
2881	3345
2882	3346	noaliencache [MM, NUMA, SLAB] Disables the allocation of alien
2883	3347	caches in the slab allocator. Saves per-node memory,
..	..	@@ -2915,11 +3379,11 @@
2915	3379	noexec=on: enable non-executable mappings (default)
2916	3380	noexec=off: disable non-executable mappings
2917	3381
2918		- nosmap [X86]
	3382	+ nosmap [X86,PPC]
2919	3383	Disable SMAP (Supervisor Mode Access Prevention)
2920	3384	even if it is supported by processor.
2921	3385
2922		- nosmep [X86]
	3386	+ nosmep [X86,PPC]
2923	3387	Disable SMEP (Supervisor Mode Execution Prevention)
2924	3388	even if it is supported by processor.
2925	3389
..	..	@@ -2936,18 +3400,18 @@
2936	3400	register save and restore. The kernel will only save
2937	3401	legacy floating-point registers on task switch.
2938	3402
2939		- nohugeiomap [KNL,x86] Disable kernel huge I/O mappings.
	3403	+ nohugeiomap [KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
2940	3404
2941	3405	nosmt [KNL,S390] Disable symmetric multithreading (SMT).
2942	3406	Equivalent to smt=1.
2943	3407
2944		- [KNL,x86] Disable symmetric multithreading (SMT).
	3408	+ [KNL,X86] Disable symmetric multithreading (SMT).
2945	3409	nosmt=force: Force disable SMT, cannot be undone
2946	3410	via the sysfs control file.
2947	3411
2948		- nospectre_v1 [X66, PPC] Disable mitigations for Spectre Variant 1
2949		- (bounds check bypass). With this option data leaks
2950		- are possible in the system.
	3412	+ nospectre_v1 [X86,PPC] Disable mitigations for Spectre Variant 1
	3413	+ (bounds check bypass). With this option data leaks are
	3414	+ possible in the system.
2951	3415
2952	3416	nospectre_v2 [X86,PPC_FSL_BOOK3E,ARM64] Disable all mitigations for
2953	3417	the Spectre variant 2 (indirect branch prediction)
..	..	@@ -2993,6 +3457,20 @@
2993	3457	interrupt wake-up latency, which may improve performance
2994	3458	in certain environments such as networked servers or
2995	3459	real-time systems.
	3460	+
	3461	+ no_hash_pointers
	3462	+ Force pointers printed to the console or buffers to be
	3463	+ unhashed. By default, when a pointer is printed via %p
	3464	+ format string, that pointer is "hashed", i.e. obscured
	3465	+ by hashing the pointer value. This is a security feature
	3466	+ that hides actual kernel addresses from unprivileged
	3467	+ users, but it also makes debugging the kernel more
	3468	+ difficult since unequal pointers can no longer be
	3469	+ compared. However, if this command-line option is
	3470	+ specified, then all normal pointers will have their true
	3471	+ value printed. This option should only be specified when
	3472	+ debugging the kernel. Please do not use on production
	3473	+ kernels.
2996	3474
2997	3475	nohibernate [HIBERNATION] Disable hibernation and resume.
2998	3476
..	..	@@ -3042,9 +3520,9 @@
3042	3520	[X86,PV_OPS] Disable paravirtualized VMware scheduler
3043	3521	clock and use the default one.
3044	3522
3045		- no-steal-acc [X86,KVM] Disable paravirtualized steal time accounting.
3046		- steal time is computed, but won't influence scheduler
3047		- behaviour
	3523	+ no-steal-acc [X86,PV_OPS,ARM64] Disable paravirtualized steal time
	3524	+ accounting. steal time is computed, but won't
	3525	+ influence scheduler behaviour
3048	3526
3049	3527	nolapic [X86-32,APIC] Do not enable or use the local APIC.
3050	3528
..	..	@@ -3151,16 +3629,10 @@
3151	3629	numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA.
3152	3630	'node', 'default' can be specified
3153	3631	This can be set from sysctl after boot.
3154		- See Documentation/sysctl/vm.txt for details.
3155		-
3156		- of_devlink [OF, KNL] Create device links between consumer and
3157		- supplier devices by scanning the devictree to infer the
3158		- consumer/supplier relationships. A consumer device
3159		- will not be probed until all the supplier devices have
3160		- probed successfully.
	3632	+ See Documentation/admin-guide/sysctl/vm.rst for details.
3161	3633
3162	3634	ohci1394_dma=early [HW] enable debugging via the ohci1394 driver.
3163		- See Documentation/debugging-via-ohci1394.txt for more
	3635	+ See Documentation/core-api/debugging-via-ohci1394.rst for more
3164	3636	info.
3165	3637
3166	3638	olpc_ec_timeout= [OLPC] ms delay when issuing EC commands
..	..	@@ -3195,6 +3667,16 @@
3195	3667	This will also cause panics on machine check exceptions.
3196	3668	Useful together with panic=30 to trigger a reboot.
3197	3669
	3670	+ page_alloc.shuffle=
	3671	+ [KNL] Boolean flag to control whether the page allocator
	3672	+ should randomize its free lists. The randomization may
	3673	+ be automatically enabled if the kernel detects it is
	3674	+ running on a platform with a direct-mapped memory-side
	3675	+ cache, and this parameter can be used to
	3676	+ override/disable that behavior. The state of the flag
	3677	+ can be read from sysfs at:
	3678	+ /sys/module/page_alloc/parameters/shuffle.
	3679	+
3198	3680	page_owner= [KNL] Boot-time page_owner enabling option.
3199	3681	Storage of the information about who allocated
3200	3682	each page is disabled in default. With this switch,
..	..	@@ -3213,8 +3695,36 @@
3213	3695	timeout < 0: reboot immediately
3214	3696	Format: <timeout>
3215	3697
	3698	+ panic_print= Bitmask for printing system info when panic happens.
	3699	+ User can chose combination of the following bits:
	3700	+ bit 0: print all tasks info
	3701	+ bit 1: print system memory info
	3702	+ bit 2: print timer info
	3703	+ bit 3: print locks info if CONFIG_LOCKDEP is on
	3704	+ bit 4: print ftrace buffer
	3705	+ bit 5: print all printk messages in buffer
	3706	+
	3707	+ panic_on_taint= Bitmask for conditionally calling panic() in add_taint()
	3708	+ Format: <hex>[,nousertaint]
	3709	+ Hexadecimal bitmask representing the set of TAINT flags
	3710	+ that will cause the kernel to panic when add_taint() is
	3711	+ called with any of the flags in this set.
	3712	+ The optional switch "nousertaint" can be utilized to
	3713	+ prevent userspace forced crashes by writing to sysctl
	3714	+ /proc/sys/kernel/tainted any flagset matching with the
	3715	+ bitmask set on panic_on_taint.
	3716	+ See Documentation/admin-guide/tainted-kernels.rst for
	3717	+ extra details on the taint flags that users can pick
	3718	+ to compose the bitmask to assign to panic_on_taint.
	3719	+
3216	3720	panic_on_warn panic() instead of WARN(). Useful to cause kdump
3217	3721	on a WARN().
	3722	+
	3723	+ pelt= [KNL] Boot-time parameter changing the PELT half life in ms
	3724	+ Format: <int>
	3725	+ 32: Set the half life to 32ms
	3726	+ 8: Set the half life to 8ms
	3727	+ default: 32
3218	3728
3219	3729	crash_kexec_post_notifiers
3220	3730	Run kdump after running panic-notifiers and dumping
..	..	@@ -3262,7 +3772,7 @@
3262	3772
3263	3773	pcd. [PARIDE]
3264	3774	See header of drivers/block/paride/pcd.c.
3265		- See also Documentation/blockdev/paride.txt.
	3775	+ See also Documentation/admin-guide/blockdev/paride.rst.
3266	3776
3267	3777	pci=option[,option...] [PCI] various PCI subsystem options.
3268	3778
..	..	@@ -3422,12 +3932,13 @@
3422	3932	specify the device is described above.
3423	3933	If <order of align> is not specified,
3424	3934	PAGE_SIZE is used as alignment.
3425		- PCI-PCI bridge can be specified, if resource
	3935	+ A PCI-PCI bridge can be specified if resource
3426	3936	windows need to be expanded.
3427	3937	To specify the alignment for several
3428	3938	instances of a device, the PCI vendor,
3429	3939	device, subvendor, and subdevice may be
3430		- specified, e.g., 4096@pci:8086:9c22:103c:198f
	3940	+ specified, e.g., 12@pci:8086:9c22:103c:198f
	3941	+ for 4096-byte alignment.
3431	3942	ecrc= Enable/disable PCIe ECRC (transaction layer
3432	3943	end-to-end CRC checking).
3433	3944	bios: Use BIOS/firmware settings. This is the
..	..	@@ -3437,8 +3948,15 @@
3437	3948	hpiosize=nn[KMG] The fixed amount of bus space which is
3438	3949	reserved for hotplug bridge's IO window.
3439	3950	Default size is 256 bytes.
	3951	+ hpmmiosize=nn[KMG] The fixed amount of bus space which is
	3952	+ reserved for hotplug bridge's MMIO window.
	3953	+ Default size is 2 megabytes.
	3954	+ hpmmioprefsize=nn[KMG] The fixed amount of bus space which is
	3955	+ reserved for hotplug bridge's MMIO_PREF window.
	3956	+ Default size is 2 megabytes.
3440	3957	hpmemsize=nn[KMG] The fixed amount of bus space which is
3441		- reserved for hotplug bridge's memory window.
	3958	+ reserved for hotplug bridge's MMIO and
	3959	+ MMIO_PREF window.
3442	3960	Default size is 2 megabytes.
3443	3961	hpbussize=nn The minimum amount of additional bus numbers
3444	3962	reserved for buses below a hotplug bridge.
..	..	@@ -3471,6 +3989,10 @@
3471	3989	bridges without forcing it upstream. Note:
3472	3990	this removes isolation between devices and
3473	3991	may put more devices in an IOMMU group.
	3992	+ force_floating [S390] Force usage of floating interrupts.
	3993	+ nomio [S390] Do not use MIO instructions.
	3994	+ norid [S390] ignore the RID field and force use of
	3995	+ one PCI domain per PCI function
3474	3996
3475	3997	pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State Power
3476	3998	Management.
..	..	@@ -3483,6 +4005,8 @@
3483	4005	even if the platform doesn't give the OS permission to
3484	4006	use them. This may cause conflicts if the platform
3485	4007	also tries to use these services.
	4008	+ dpc-native Use native PCIe service for DPC only. May
	4009	+ cause conflicts if firmware uses AER or DPC.
3486	4010	compat Disable native PCIe services (PME, AER, DPC, PCIe
3487	4011	hotplug).
3488	4012
..	..	@@ -3504,7 +4028,7 @@
3504	4028	needed on a platform with proper driver support.
3505	4029
3506	4030	pd. [PARIDE]
3507		- See Documentation/blockdev/paride.txt.
	4031	+ See Documentation/admin-guide/blockdev/paride.rst.
3508	4032
3509	4033	pdcchassis= [PARISC,HW] Disable/Enable PDC Chassis Status codes at
3510	4034	boot time.
..	..	@@ -3519,13 +4043,13 @@
3519	4043	and performance comparison.
3520	4044
3521	4045	pf. [PARIDE]
3522		- See Documentation/blockdev/paride.txt.
	4046	+ See Documentation/admin-guide/blockdev/paride.rst.
3523	4047
3524	4048	pg. [PARIDE]
3525		- See Documentation/blockdev/paride.txt.
	4049	+ See Documentation/admin-guide/blockdev/paride.rst.
3526	4050
3527	4051	pirq= [SMP,APIC] Manual mp-table setup
3528		- See Documentation/x86/i386/IO-APIC.txt.
	4052	+ See Documentation/x86/i386/IO-APIC.rst.
3529	4053
3530	4054	plip= [PPT,NET] Parallel port network link
3531	4055	Format: { parport<nr> \| timid \| 0 }
..	..	@@ -3534,6 +4058,9 @@
3534	4058	pmtmr= [X86] Manual setup of pmtmr I/O Port.
3535	4059	Override pmtimer IOPort with a hex value.
3536	4060	e.g. pmtmr=0x508
	4061	+
	4062	+ pm_debug_messages [SUSPEND,KNL]
	4063	+ Enable suspend/resume debug messages during boot up.
3537	4064
3538	4065	pnp.debug=1 [PNP]
3539	4066	Enable PNP debug messages (depends on the
..	..	@@ -3632,9 +4159,12 @@
3632	4159	Param: <number> - step/bucket size as a power of 2 for
3633	4160	statistical time based profiling.
3634	4161
3635		- prompt_ramdisk= [RAM] List of RAM disks to prompt for floppy disk
3636		- before loading.
3637		- See Documentation/blockdev/ramdisk.txt.
	4162	+ prompt_ramdisk= [RAM] [Deprecated]
	4163	+
	4164	+ prot_virt= [S390] enable hosting protected virtual machines
	4165	+ isolated from the hypervisor (if hardware supports
	4166	+ that).
	4167	+ Format: <bool>
3638	4168
3639	4169	psi= [KNL] Enable or disable pressure stall information
3640	4170	tracking.
..	..	@@ -3656,9 +4186,9 @@
3656	4186	pstore.backend= Specify the name of the pstore backend to use
3657	4187
3658	4188	pt. [PARIDE]
3659		- See Documentation/blockdev/paride.txt.
	4189	+ See Documentation/admin-guide/blockdev/paride.rst.
3660	4190
3661		- pti= [X86_64] Control Page Table Isolation of user and
	4191	+ pti= [X86-64] Control Page Table Isolation of user and
3662	4192	kernel address spaces. Disabling this feature
3663	4193	removes hardening, but improves performance of
3664	4194	system calls and interrupts.
..	..	@@ -3670,7 +4200,7 @@
3670	4200
3671	4201	Not specifying this option is equivalent to pti=auto.
3672	4202
3673		- nopti [X86_64]
	4203	+ nopti [X86-64]
3674	4204	Equivalent to pti=off
3675	4205
3676	4206	pty.legacy_count=
..	..	@@ -3685,13 +4215,21 @@
3685	4215	See Documentation/admin-guide/md.rst.
3686	4216
3687	4217	ramdisk_size= [RAM] Sizes of RAM disks in kilobytes
3688		- See Documentation/blockdev/ramdisk.txt.
	4218	+ See Documentation/admin-guide/blockdev/ramdisk.rst.
	4219	+
	4220	+ ramdisk_start= [RAM] RAM disk image start address
3689	4221
3690	4222	random.trust_cpu={on,off}
3691	4223	[KNL] Enable or disable trusting the use of the
3692	4224	CPU's random number generator (if available) to
3693	4225	fully seed the kernel's CRNG. Default is controlled
3694	4226	by CONFIG_RANDOM_TRUST_CPU.
	4227	+
	4228	+ random.trust_bootloader={on,off}
	4229	+ [KNL] Enable or disable trusting the use of a
	4230	+ seed passed by the bootloader (if available) to
	4231	+ fully seed the kernel's CRNG. Default is controlled
	4232	+ by CONFIG_RANDOM_TRUST_BOOTLOADER.
3695	4233
3696	4234	ras=option[,option,...] [KNL] RAS-specific options
3697	4235
..	..	@@ -3700,18 +4238,20 @@
3700	4238	see CONFIG_RAS_CEC help text.
3701	4239
3702	4240	rcu_nocbs= [KNL]
3703		- The argument is a cpu list, as described above.
	4241	+ The argument is a cpu list, as described above,
	4242	+ except that the string "all" can be used to
	4243	+ specify every CPU on the system.
3704	4244
3705	4245	In kernels built with CONFIG_RCU_NOCB_CPU=y, set
3706	4246	the specified list of CPUs to be no-callback CPUs.
3707		- Invocation of these CPUs' RCU callbacks will
3708		- be offloaded to "rcuox/N" kthreads created for
3709		- that purpose, where "x" is "b" for RCU-bh, "p"
3710		- for RCU-preempt, and "s" for RCU-sched, and "N"
3711		- is the CPU number. This reduces OS jitter on the
3712		- offloaded CPUs, which can be useful for HPC and
3713		- real-time workloads. It can also improve energy
3714		- efficiency for asymmetric multiprocessors.
	4247	+ Invocation of these CPUs' RCU callbacks will be
	4248	+ offloaded to "rcuox/N" kthreads created for that
	4249	+ purpose, where "x" is "p" for RCU-preempt, and
	4250	+ "s" for RCU-sched, and "N" is the CPU number.
	4251	+ This reduces OS jitter on the offloaded CPUs,
	4252	+ which can be useful for HPC and real-time
	4253	+ workloads. It can also improve energy efficiency
	4254	+ for asymmetric multiprocessors.
3715	4255
3716	4256	rcu_nocb_poll [KNL]
3717	4257	Rather than requiring that offloaded CPUs
..	..	@@ -3747,6 +4287,12 @@
3747	4287	the propagation of recent CPU-hotplug changes up
3748	4288	the rcu_node combining tree.
3749	4289
	4290	+ rcutree.use_softirq= [KNL]
	4291	+ If set to zero, move all RCU_SOFTIRQ processing to
	4292	+ per-CPU rcuc kthreads. Defaults to a non-zero
	4293	+ value, meaning that RCU_SOFTIRQ is used by default.
	4294	+ Specify rcutree.use_softirq=0 to use rcuc kthreads.
	4295	+
3750	4296	rcutree.rcu_fanout_exact= [KNL]
3751	4297	Disable autobalancing of the rcu_node combining
3752	4298	tree. This is used by rcutorture, and might
..	..	@@ -3761,11 +4307,13 @@
3761	4307	latencies, which will choose a value aligned
3762	4308	with the appropriate hardware boundaries.
3763	4309
3764		- rcutree.jiffies_till_sched_qs= [KNL]
3765		- Set required age in jiffies for a
3766		- given grace period before RCU starts
3767		- soliciting quiescent-state help from
3768		- rcu_note_context_switch().
	4310	+ rcutree.rcu_min_cached_objs= [KNL]
	4311	+ Minimum number of objects which are cached and
	4312	+ maintained per one CPU. Object size is equal
	4313	+ to PAGE_SIZE. The cache allows to reduce the
	4314	+ pressure to page allocator, also it makes the
	4315	+ whole algorithm to behave better in low memory
	4316	+ condition.
3769	4317
3770	4318	rcutree.jiffies_till_first_fqs= [KNL]
3771	4319	Set delay from grace-period initialization to
..	..	@@ -3778,6 +4326,20 @@
3778	4326	quiescent states. Units are jiffies, minimum
3779	4327	value is one, and maximum value is HZ.
3780	4328
	4329	+ rcutree.jiffies_till_sched_qs= [KNL]
	4330	+ Set required age in jiffies for a
	4331	+ given grace period before RCU starts
	4332	+ soliciting quiescent-state help from
	4333	+ rcu_note_context_switch() and cond_resched().
	4334	+ If not specified, the kernel will calculate
	4335	+ a value based on the most recent settings
	4336	+ of rcutree.jiffies_till_first_fqs
	4337	+ and rcutree.jiffies_till_next_fqs.
	4338	+ This calculated value may be viewed in
	4339	+ rcutree.jiffies_to_sched_qs. Any attempt to set
	4340	+ rcutree.jiffies_to_sched_qs will be cheerfully
	4341	+ overwritten.
	4342	+
3781	4343	rcutree.kthread_prio= [KNL,BOOT]
3782	4344	Set the SCHED_FIFO priority of the RCU per-CPU
3783	4345	kthreads (rcuc/N). This value is also used for
..	..	@@ -3789,12 +4351,13 @@
3789	4351	RCU_BOOST is not set, valid values are 0-99 and
3790	4352	the default is zero (non-realtime operation).
3791	4353
3792		- rcutree.rcu_nocb_leader_stride= [KNL]
3793		- Set the number of NOCB kthread groups, which
3794		- defaults to the square root of the number of
3795		- CPUs. Larger numbers reduces the wakeup overhead
3796		- on the per-CPU grace-period kthreads, but increases
3797		- that same overhead on each group's leader.
	4354	+ rcutree.rcu_nocb_gp_stride= [KNL]
	4355	+ Set the number of NOCB callback kthreads in
	4356	+ each group, which defaults to the square root
	4357	+ of the number of CPUs. Larger numbers reduce
	4358	+ the wakeup overhead on the global grace-period
	4359	+ kthread, but increases that same overhead on
	4360	+ each group's NOCB grace-period kthread.
3798	4361
3799	4362	rcutree.qhimark= [KNL]
3800	4363	Set threshold of queued RCU callbacks beyond which
..	..	@@ -3803,6 +4366,15 @@
3803	4366	rcutree.qlowmark= [KNL]
3804	4367	Set threshold of queued RCU callbacks below which
3805	4368	batch limiting is re-enabled.
	4369	+
	4370	+ rcutree.qovld= [KNL]
	4371	+ Set threshold of queued RCU callbacks beyond which
	4372	+ RCU's force-quiescent-state scan will aggressively
	4373	+ enlist help from cond_resched() and sched IPIs to
	4374	+ help CPUs more quickly reach quiescent states.
	4375	+ Set to less than zero to make this be set based
	4376	+ on rcutree.qhimark at boot time and to zero to
	4377	+ disable more aggressive help enlistment.
3806	4378
3807	4379	rcutree.rcu_idle_gp_delay= [KNL]
3808	4380	Set wakeup interval for idle CPUs that have
..	..	@@ -3821,28 +4393,55 @@
3821	4393	This wake_up() will be accompanied by a
3822	4394	WARN_ONCE() splat and an ftrace_dump().
3823	4395
3824		- rcuperf.gp_async= [KNL]
	4396	+ rcutree.rcu_unlock_delay= [KNL]
	4397	+ In CONFIG_RCU_STRICT_GRACE_PERIOD=y kernels,
	4398	+ this specifies an rcu_read_unlock()-time delay
	4399	+ in microseconds. This defaults to zero.
	4400	+ Larger delays increase the probability of
	4401	+ catching RCU pointer leaks, that is, buggy use
	4402	+ of RCU-protected pointers after the relevant
	4403	+ rcu_read_unlock() has completed.
	4404	+
	4405	+ rcutree.sysrq_rcu= [KNL]
	4406	+ Commandeer a sysrq key to dump out Tree RCU's
	4407	+ rcu_node tree with an eye towards determining
	4408	+ why a new grace period has not yet started.
	4409	+
	4410	+ rcuscale.gp_async= [KNL]
3825	4411	Measure performance of asynchronous
3826	4412	grace-period primitives such as call_rcu().
3827	4413
3828		- rcuperf.gp_async_max= [KNL]
	4414	+ rcuscale.gp_async_max= [KNL]
3829	4415	Specify the maximum number of outstanding
3830	4416	callbacks per writer thread. When a writer
3831	4417	thread exceeds this limit, it invokes the
3832	4418	corresponding flavor of rcu_barrier() to allow
3833	4419	previously posted callbacks to drain.
3834	4420
3835		- rcuperf.gp_exp= [KNL]
	4421	+ rcuscale.gp_exp= [KNL]
3836	4422	Measure performance of expedited synchronous
3837	4423	grace-period primitives.
3838	4424
3839		- rcuperf.holdoff= [KNL]
	4425	+ rcuscale.holdoff= [KNL]
3840	4426	Set test-start holdoff period. The purpose of
3841	4427	this parameter is to delay the start of the
3842	4428	test until boot completes in order to avoid
3843	4429	interference.
3844	4430
3845		- rcuperf.nreaders= [KNL]
	4431	+ rcuscale.kfree_rcu_test= [KNL]
	4432	+ Set to measure performance of kfree_rcu() flooding.
	4433	+
	4434	+ rcuscale.kfree_nthreads= [KNL]
	4435	+ The number of threads running loops of kfree_rcu().
	4436	+
	4437	+ rcuscale.kfree_alloc_num= [KNL]
	4438	+ Number of allocations and frees done in an iteration.
	4439	+
	4440	+ rcuscale.kfree_loops= [KNL]
	4441	+ Number of loops doing rcuscale.kfree_alloc_num number
	4442	+ of allocations and frees.
	4443	+
	4444	+ rcuscale.nreaders= [KNL]
3846	4445	Set number of RCU readers. The value -1 selects
3847	4446	N, where N is the number of CPUs. A value
3848	4447	"n" less than -1 selects N-n+1, where N is again
..	..	@@ -3851,44 +4450,26 @@
3851	4450	A value of "n" less than or equal to -N selects
3852	4451	a single reader.
3853	4452
3854		- rcuperf.nwriters= [KNL]
	4453	+ rcuscale.nwriters= [KNL]
3855	4454	Set number of RCU writers. The values operate
3856		- the same as for rcuperf.nreaders.
	4455	+ the same as for rcuscale.nreaders.
3857	4456	N, where N is the number of CPUs
3858	4457
3859		- rcuperf.perf_type= [KNL]
	4458	+ rcuscale.perf_type= [KNL]
3860	4459	Specify the RCU implementation to test.
3861	4460
3862		- rcuperf.shutdown= [KNL]
	4461	+ rcuscale.shutdown= [KNL]
3863	4462	Shut the system down after performance tests
3864	4463	complete. This is useful for hands-off automated
3865	4464	testing.
3866	4465
3867		- rcuperf.verbose= [KNL]
	4466	+ rcuscale.verbose= [KNL]
3868	4467	Enable additional printk() statements.
3869	4468
3870		- rcuperf.writer_holdoff= [KNL]
	4469	+ rcuscale.writer_holdoff= [KNL]
3871	4470	Write-side holdoff between grace periods,
3872	4471	in microseconds. The default of zero says
3873	4472	no holdoff.
3874		-
3875		- rcutorture.cbflood_inter_holdoff= [KNL]
3876		- Set holdoff time (jiffies) between successive
3877		- callback-flood tests.
3878		-
3879		- rcutorture.cbflood_intra_holdoff= [KNL]
3880		- Set holdoff time (jiffies) between successive
3881		- bursts of callbacks within a given callback-flood
3882		- test.
3883		-
3884		- rcutorture.cbflood_n_burst= [KNL]
3885		- Set the number of bursts making up a given
3886		- callback-flood test. Set this to zero to
3887		- disable callback-flood testing.
3888		-
3889		- rcutorture.cbflood_n_per_burst= [KNL]
3890		- Set the number of callbacks to be registered
3891		- in a given burst of a callback-flood test.
3892	4473
3893	4474	rcutorture.fqs_duration= [KNL]
3894	4475	Set duration of force_quiescent_state bursts
..	..	@@ -3901,6 +4482,23 @@
3901	4482	rcutorture.fqs_stutter= [KNL]
3902	4483	Set wait time between force_quiescent_state bursts
3903	4484	in seconds.
	4485	+
	4486	+ rcutorture.fwd_progress= [KNL]
	4487	+ Enable RCU grace-period forward-progress testing
	4488	+ for the types of RCU supporting this notion.
	4489	+
	4490	+ rcutorture.fwd_progress_div= [KNL]
	4491	+ Specify the fraction of a CPU-stall-warning
	4492	+ period to do tight-loop forward-progress testing.
	4493	+
	4494	+ rcutorture.fwd_progress_holdoff= [KNL]
	4495	+ Number of seconds to wait between successive
	4496	+ forward-progress tests.
	4497	+
	4498	+ rcutorture.fwd_progress_need_resched= [KNL]
	4499	+ Enclose cond_resched() calls within checks for
	4500	+ need_resched() during tight-loop forward-progress
	4501	+ testing.
3904	4502
3905	4503	rcutorture.gp_cond= [KNL]
3906	4504	Use conditional/asynchronous update-side
..	..	@@ -3920,6 +4518,18 @@
3920	4518	rcutorture.gp_normal=, and rcutorture.gp_sync=
3921	4519	are zero, rcutorture acts as if is interpreted
3922	4520	they are all non-zero.
	4521	+
	4522	+ rcutorture.irqreader= [KNL]
	4523	+ Run RCU readers from irq handlers, or, more
	4524	+ accurately, from a timer handler. Not all RCU
	4525	+ flavors take kindly to this sort of thing.
	4526	+
	4527	+ rcutorture.leakpointer= [KNL]
	4528	+ Leak an RCU-protected pointer out of the reader.
	4529	+ This can of course result in splats, and is
	4530	+ intended to test the ability of things like
	4531	+ CONFIG_RCU_STRICT_GRACE_PERIOD=y to detect
	4532	+ such leaks.
3923	4533
3924	4534	rcutorture.n_barrier_cbs= [KNL]
3925	4535	Set callbacks/threads for rcu_barrier() testing.
..	..	@@ -3946,6 +4556,20 @@
3946	4556	Set time (jiffies) between CPU-hotplug operations,
3947	4557	or zero to disable CPU-hotplug testing.
3948	4558
	4559	+ rcutorture.read_exit= [KNL]
	4560	+ Set the number of read-then-exit kthreads used
	4561	+ to test the interaction of RCU updaters and
	4562	+ task-exit processing.
	4563	+
	4564	+ rcutorture.read_exit_burst= [KNL]
	4565	+ The number of times in a given read-then-exit
	4566	+ episode that a set of read-then-exit kthreads
	4567	+ is spawned.
	4568	+
	4569	+ rcutorture.read_exit_delay= [KNL]
	4570	+ The delay, in seconds, between successive
	4571	+ read-then-exit testing episodes.
	4572	+
3949	4573	rcutorture.shuffle_interval= [KNL]
3950	4574	Set task-shuffle interval (s). Shuffling tasks
3951	4575	allows some CPUs to go into dyntick-idle mode
..	..	@@ -3959,11 +4583,23 @@
3959	4583	Duration of CPU stall (s) to test RCU CPU stall
3960	4584	warnings, zero to disable.
3961	4585
	4586	+ rcutorture.stall_cpu_block= [KNL]
	4587	+ Sleep while stalling if set. This will result
	4588	+ in warnings from preemptible RCU in addition
	4589	+ to any other stall-related activity.
	4590	+
3962	4591	rcutorture.stall_cpu_holdoff= [KNL]
3963	4592	Time to wait (s) after boot before inducing stall.
3964	4593
3965	4594	rcutorture.stall_cpu_irqsoff= [KNL]
3966	4595	Disable interrupts while stalling if set.
	4596	+
	4597	+ rcutorture.stall_gp_kthread= [KNL]
	4598	+ Duration (s) of forced sleep within RCU
	4599	+ grace-period kthread to test RCU CPU stall
	4600	+ warnings, zero to disable. If both stall_cpu
	4601	+ and stall_gp_kthread are specified, the
	4602	+ kthread is starved first, then the CPU.
3967	4603
3968	4604	rcutorture.stat_interval= [KNL]
3969	4605	Time (s) between statistics printk()s.
..	..	@@ -3995,8 +4631,18 @@
3995	4631	rcutorture.verbose= [KNL]
3996	4632	Enable additional printk() statements.
3997	4633
	4634	+ rcupdate.rcu_cpu_stall_ftrace_dump= [KNL]
	4635	+ Dump ftrace buffer after reporting RCU CPU
	4636	+ stall warning.
	4637	+
3998	4638	rcupdate.rcu_cpu_stall_suppress= [KNL]
3999	4639	Suppress RCU CPU stall warning messages.
	4640	+
	4641	+ rcupdate.rcu_cpu_stall_suppress_at_boot= [KNL]
	4642	+ Suppress RCU CPU stall warning messages and
	4643	+ rcutorture writer stall warnings that occur
	4644	+ during early boot, that is, during the time
	4645	+ before the init task is spawned.
4000	4646
4001	4647	rcupdate.rcu_cpu_stall_timeout= [KNL]
4002	4648	Set timeout for RCU CPU stall warning messages.
..	..	@@ -4025,6 +4671,13 @@
4025	4671	only normal grace-period primitives. No effect
4026	4672	on CONFIG_TINY_RCU kernels.
4027	4673
	4674	+ rcupdate.rcu_task_ipi_delay= [KNL]
	4675	+ Set time in jiffies during which RCU tasks will
	4676	+ avoid sending IPIs, starting with the beginning
	4677	+ of a given grace period. Setting a large
	4678	+ number avoids disturbing real-time workloads,
	4679	+ but lengthens grace periods.
	4680	+
4028	4681	rcupdate.rcu_task_stall_timeout= [KNL]
4029	4682	Set timeout in jiffies for RCU task stall warning
4030	4683	messages. Disable with a value less than or equal
..	..	@@ -4032,12 +4685,6 @@
4032	4685
4033	4686	rcupdate.rcu_self_test= [KNL]
4034	4687	Run the RCU early boot self tests
4035		-
4036		- rcupdate.rcu_self_test_bh= [KNL]
4037		- Run the RCU bh early boot self tests
4038		-
4039		- rcupdate.rcu_self_test_sched= [KNL]
4040		- Run the RCU sched early boot self tests
4041	4688
4042	4689	rdinit= [KNL]
4043	4690	Format: <full_path>
..	..	@@ -4072,9 +4719,48 @@
4072	4719	reboot_cpu is s[mp]#### with #### being the processor
4073	4720	to be used for rebooting.
4074	4721
	4722	+ refscale.holdoff= [KNL]
	4723	+ Set test-start holdoff period. The purpose of
	4724	+ this parameter is to delay the start of the
	4725	+ test until boot completes in order to avoid
	4726	+ interference.
	4727	+
	4728	+ refscale.loops= [KNL]
	4729	+ Set the number of loops over the synchronization
	4730	+ primitive under test. Increasing this number
	4731	+ reduces noise due to loop start/end overhead,
	4732	+ but the default has already reduced the per-pass
	4733	+ noise to a handful of picoseconds on ca. 2020
	4734	+ x86 laptops.
	4735	+
	4736	+ refscale.nreaders= [KNL]
	4737	+ Set number of readers. The default value of -1
	4738	+ selects N, where N is roughly 75% of the number
	4739	+ of CPUs. A value of zero is an interesting choice.
	4740	+
	4741	+ refscale.nruns= [KNL]
	4742	+ Set number of runs, each of which is dumped onto
	4743	+ the console log.
	4744	+
	4745	+ refscale.readdelay= [KNL]
	4746	+ Set the read-side critical-section duration,
	4747	+ measured in microseconds.
	4748	+
	4749	+ refscale.scale_type= [KNL]
	4750	+ Specify the read-protection implementation to test.
	4751	+
	4752	+ refscale.shutdown= [KNL]
	4753	+ Shut down the system at the end of the performance
	4754	+ test. This defaults to 1 (shut it down) when
	4755	+ refscale is built into the kernel and to 0 (leave
	4756	+ it running) when refscale is built as a module.
	4757	+
	4758	+ refscale.verbose= [KNL]
	4759	+ Enable additional printk() statements.
	4760	+
4075	4761	relax_domain_level=
4076	4762	[KNL, SMP] Set scheduler's default relax_domain_level.
4077		- See Documentation/cgroup-v1/cpusets.txt.
	4763	+ See Documentation/admin-guide/cgroup-v1/cpusets.rst.
4078	4764
4079	4765	reserve= [KNL,BUGS] Force kernel to ignore I/O ports or memory
4080	4766	Format: <base1>,<size1>[,<base2>,<size2>,...]
..	..	@@ -4104,7 +4790,7 @@
4104	4790	Specify the offset from the beginning of the partition
4105	4791	given by "resume=" at which the swap header is located,
4106	4792	in <PAGE_SIZE> units (needed only for swap files).
4107		- See Documentation/power/swsusp-and-swap-files.txt
	4793	+ See Documentation/power/swsusp-and-swap-files.rst
4108	4794
4109	4795	resumedelay= [HIBERNATION] Delay (in seconds) to pause before attempting to
4110	4796	read the resume files
..	..	@@ -4123,6 +4809,43 @@
4123	4809	during restoration read-only).
4124	4810
4125	4811	retain_initrd [RAM] Keep initrd memory after extraction
	4812	+
	4813	+ retbleed= [X86] Control mitigation of RETBleed (Arbitrary
	4814	+ Speculative Code Execution with Return Instructions)
	4815	+ vulnerability.
	4816	+
	4817	+ AMD-based UNRET and IBPB mitigations alone do not stop
	4818	+ sibling threads from influencing the predictions of other
	4819	+ sibling threads. For that reason, STIBP is used on pro-
	4820	+ cessors that support it, and mitigate SMT on processors
	4821	+ that don't.
	4822	+
	4823	+ off - no mitigation
	4824	+ auto - automatically select a migitation
	4825	+ auto,nosmt - automatically select a mitigation,
	4826	+ disabling SMT if necessary for
	4827	+ the full mitigation (only on Zen1
	4828	+ and older without STIBP).
	4829	+ ibpb - On AMD, mitigate short speculation
	4830	+ windows on basic block boundaries too.
	4831	+ Safe, highest perf impact. It also
	4832	+ enables STIBP if present. Not suitable
	4833	+ on Intel.
	4834	+ ibpb,nosmt - Like "ibpb" above but will disable SMT
	4835	+ when STIBP is not available. This is
	4836	+ the alternative for systems which do not
	4837	+ have STIBP.
	4838	+ unret - Force enable untrained return thunks,
	4839	+ only effective on AMD f15h-f17h based
	4840	+ systems.
	4841	+ unret,nosmt - Like unret, but will disable SMT when STIBP
	4842	+ is not available. This is the alternative for
	4843	+ systems which do not have STIBP.
	4844	+
	4845	+ Selecting 'auto' will choose a mitigation method at run
	4846	+ time according to the CPU.
	4847	+
	4848	+ Not specifying this option is equivalent to retbleed=auto.
4126	4849
4127	4850	rfkill.default_state=
4128	4851	0 "airplane mode". All wifi, bluetooth, wimax, gps, fm,
..	..	@@ -4197,6 +4920,114 @@
4197	4920	incurs a small amount of overhead in the scheduler
4198	4921	but is useful for debugging and performance tuning.
4199	4922
	4923	+ sched_thermal_decay_shift=
	4924	+ [KNL, SMP] Set a decay shift for scheduler thermal
	4925	+ pressure signal. Thermal pressure signal follows the
	4926	+ default decay period of other scheduler pelt
	4927	+ signals(usually 32 ms but configurable). Setting
	4928	+ sched_thermal_decay_shift will left shift the decay
	4929	+ period for the thermal pressure signal by the shift
	4930	+ value.
	4931	+ i.e. with the default pelt decay period of 32 ms
	4932	+ sched_thermal_decay_shift thermal pressure decay pr
	4933	+ 1 64 ms
	4934	+ 2 128 ms
	4935	+ and so on.
	4936	+ Format: integer between 0 and 10
	4937	+ Default is 0.
	4938	+
	4939	+ scftorture.holdoff= [KNL]
	4940	+ Number of seconds to hold off before starting
	4941	+ test. Defaults to zero for module insertion and
	4942	+ to 10 seconds for built-in smp_call_function()
	4943	+ tests.
	4944	+
	4945	+ scftorture.longwait= [KNL]
	4946	+ Request ridiculously long waits randomly selected
	4947	+ up to the chosen limit in seconds. Zero (the
	4948	+ default) disables this feature. Please note
	4949	+ that requesting even small non-zero numbers of
	4950	+ seconds can result in RCU CPU stall warnings,
	4951	+ softlockup complaints, and so on.
	4952	+
	4953	+ scftorture.nthreads= [KNL]
	4954	+ Number of kthreads to spawn to invoke the
	4955	+ smp_call_function() family of functions.
	4956	+ The default of -1 specifies a number of kthreads
	4957	+ equal to the number of CPUs.
	4958	+
	4959	+ scftorture.onoff_holdoff= [KNL]
	4960	+ Number seconds to wait after the start of the
	4961	+ test before initiating CPU-hotplug operations.
	4962	+
	4963	+ scftorture.onoff_interval= [KNL]
	4964	+ Number seconds to wait between successive
	4965	+ CPU-hotplug operations. Specifying zero (which
	4966	+ is the default) disables CPU-hotplug operations.
	4967	+
	4968	+ scftorture.shutdown_secs= [KNL]
	4969	+ The number of seconds following the start of the
	4970	+ test after which to shut down the system. The
	4971	+ default of zero avoids shutting down the system.
	4972	+ Non-zero values are useful for automated tests.
	4973	+
	4974	+ scftorture.stat_interval= [KNL]
	4975	+ The number of seconds between outputting the
	4976	+ current test statistics to the console. A value
	4977	+ of zero disables statistics output.
	4978	+
	4979	+ scftorture.stutter_cpus= [KNL]
	4980	+ The number of jiffies to wait between each change
	4981	+ to the set of CPUs under test.
	4982	+
	4983	+ scftorture.use_cpus_read_lock= [KNL]
	4984	+ Use use_cpus_read_lock() instead of the default
	4985	+ preempt_disable() to disable CPU hotplug
	4986	+ while invoking one of the smp_call_function*()
	4987	+ functions.
	4988	+
	4989	+ scftorture.verbose= [KNL]
	4990	+ Enable additional printk() statements.
	4991	+
	4992	+ scftorture.weight_single= [KNL]
	4993	+ The probability weighting to use for the
	4994	+ smp_call_function_single() function with a zero
	4995	+ "wait" parameter. A value of -1 selects the
	4996	+ default if all other weights are -1. However,
	4997	+ if at least one weight has some other value, a
	4998	+ value of -1 will instead select a weight of zero.
	4999	+
	5000	+ scftorture.weight_single_wait= [KNL]
	5001	+ The probability weighting to use for the
	5002	+ smp_call_function_single() function with a
	5003	+ non-zero "wait" parameter. See weight_single.
	5004	+
	5005	+ scftorture.weight_many= [KNL]
	5006	+ The probability weighting to use for the
	5007	+ smp_call_function_many() function with a zero
	5008	+ "wait" parameter. See weight_single.
	5009	+ Note well that setting a high probability for
	5010	+ this weighting can place serious IPI load
	5011	+ on the system.
	5012	+
	5013	+ scftorture.weight_many_wait= [KNL]
	5014	+ The probability weighting to use for the
	5015	+ smp_call_function_many() function with a
	5016	+ non-zero "wait" parameter. See weight_single
	5017	+ and weight_many.
	5018	+
	5019	+ scftorture.weight_all= [KNL]
	5020	+ The probability weighting to use for the
	5021	+ smp_call_function_all() function with a zero
	5022	+ "wait" parameter. See weight_single and
	5023	+ weight_many.
	5024	+
	5025	+ scftorture.weight_all_wait= [KNL]
	5026	+ The probability weighting to use for the
	5027	+ smp_call_function_all() function with a
	5028	+ non-zero "wait" parameter. See weight_single
	5029	+ and weight_many.
	5030	+
4200	5031	skew_tick= [KNL] Offset the periodic timer tick per cpu to mitigate
4201	5032	xtime_lock contention on larger systems, and/or RCU lock
4202	5033	contention on all systems with CONFIG_MAXSMP set.
..	..	@@ -4206,20 +5037,16 @@
4206	5037	Note: increases power consumption, thus should only be
4207	5038	enabled if running jitter sensitive (HPC/RT) workloads.
4208	5039
4209		- security= [SECURITY] Choose a security module to enable at boot.
4210		- If this boot parameter is not specified, only the first
4211		- security module asking for security registration will be
4212		- loaded. An invalid security module name will be treated
4213		- as if no module has been chosen.
	5040	+ security= [SECURITY] Choose a legacy "major" security module to
	5041	+ enable at boot. This has been deprecated by the
	5042	+ "lsm=" parameter.
4214	5043
4215	5044	selinux= [SELINUX] Disable or enable SELinux at boot time.
4216	5045	Format: { "0" \| "1" }
4217	5046	See security/selinux/Kconfig help text.
4218	5047	0 -- disable.
4219	5048	1 -- enable.
4220		- Default value is set via kernel config option.
4221		- If enabled at boot time, /selinux/disable can be used
4222		- later to disable prior to initial policy load.
	5049	+ Default value is 1.
4223	5050
4224	5051	apparmor= [APPARMOR] Disable or enable AppArmor at boot time
4225	5052	Format: { "0" \| "1" }
..	..	@@ -4257,7 +5084,7 @@
4257	5084	fragmentation. Defaults to 1 for systems with
4258	5085	more than 32MB of RAM, 0 otherwise.
4259	5086
4260		- slub_debug[=options[,slabs]] [MM, SLUB]
	5087	+ slub_debug[=options[,slabs][;[options[,slabs]]...] [MM, SLUB]
4261	5088	Enabling slub_debug allows one to determine the
4262	5089	culprit if slab objects become corrupted. Enabling
4263	5090	slub_debug can create guard zones around objects and
..	..	@@ -4320,21 +5147,21 @@
4320	5147
4321	5148	softlockup_panic=
4322	5149	[KNL] Should the soft-lockup detector generate panics.
4323		- Format: <integer>
	5150	+ Format: 0 \| 1
4324	5151
4325		- A nonzero value instructs the soft-lockup detector
4326		- to panic the machine when a soft-lockup occurs. This
4327		- is also controlled by CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC
4328		- which is the respective build-time switch to that
4329		- functionality.
	5152	+ A value of 1 instructs the soft-lockup detector
	5153	+ to panic the machine when a soft-lockup occurs. It is
	5154	+ also controlled by the kernel.softlockup_panic sysctl
	5155	+ and CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC, which is the
	5156	+ respective build-time switch to that functionality.
4330	5157
4331	5158	softlockup_all_cpu_backtrace=
4332	5159	[KNL] Should the soft-lockup detector generate
4333	5160	backtraces on all cpus.
4334		- Format: <integer>
	5161	+ Format: 0 \| 1
4335	5162
4336	5163	sonypi.*= [HW] Sony Programmable I/O Control Device driver
4337		- See Documentation/laptops/sonypi.txt
	5164	+ See Documentation/admin-guide/laptops/sonypi.rst
4338	5165
4339	5166	spectre_v2= [X86] Control mitigation of Spectre variant 2
4340	5167	(indirect branch speculation) vulnerability.
..	..	@@ -4363,8 +5190,13 @@
4363	5190	Specific mitigations can also be selected manually:
4364	5191
4365	5192	retpoline - replace indirect branches
4366		- retpoline,generic - google's original retpoline
4367		- retpoline,amd - AMD-specific minimal thunk
	5193	+ retpoline,generic - Retpolines
	5194	+ retpoline,lfence - LFENCE; indirect branch
	5195	+ retpoline,amd - alias for retpoline,lfence
	5196	+ eibrs - enhanced IBRS
	5197	+ eibrs,retpoline - enhanced IBRS + Retpolines
	5198	+ eibrs,lfence - enhanced IBRS + LFENCE
	5199	+ ibrs - use IBRS to protect kernel
4368	5200
4369	5201	Not specifying this option is equivalent to
4370	5202	spectre_v2=auto.
..	..	@@ -4410,6 +5242,17 @@
4410	5242
4411	5243	Not specifying this option is equivalent to
4412	5244	spectre_v2_user=auto.
	5245	+
	5246	+ spec_rstack_overflow=
	5247	+ [X86] Control RAS overflow mitigation on AMD Zen CPUs
	5248	+
	5249	+ off - Disable mitigation
	5250	+ microcode - Enable microcode mitigation only
	5251	+ safe-ret - Enable sw-only safe RET mitigation (default)
	5252	+ ibpb - Enable mitigation by issuing IBPB on
	5253	+ kernel entry
	5254	+ ibpb-vmexit - Issue IBPB only on VMEXIT
	5255	+ (cloud-specific mitigation)
4413	5256
4414	5257	spec_store_bypass_disable=
4415	5258	[HW] Control Speculative Store Bypass (SSB) Disable mitigation
..	..	@@ -4467,6 +5310,28 @@
4467	5310	spia_fio_base=
4468	5311	spia_pedr=
4469	5312	spia_peddr=
	5313	+
	5314	+ split_lock_detect=
	5315	+ [X86] Enable split lock detection
	5316	+
	5317	+ When enabled (and if hardware support is present), atomic
	5318	+ instructions that access data across cache line
	5319	+ boundaries will result in an alignment check exception.
	5320	+
	5321	+ off - not enabled
	5322	+
	5323	+ warn - the kernel will emit rate limited warnings
	5324	+ about applications triggering the #AC
	5325	+ exception. This mode is the default on CPUs
	5326	+ that supports split lock detection.
	5327	+
	5328	+ fatal - the kernel will send SIGBUS to applications
	5329	+ that trigger the #AC exception.
	5330	+
	5331	+ If an #AC exception is hit in the kernel or in
	5332	+ firmware (i.e. not while executing in user mode)
	5333	+ the kernel will oops in either "warn" or "fatal"
	5334	+ mode.
4470	5335
4471	5336	srbds= [X86,INTEL]
4472	5337	Control the Special Register Buffer Data Sampling
..	..	@@ -4528,6 +5393,12 @@
4528	5393	to (for stacks growing down) resp. after (for stacks
4529	5394	growing up) the main stack are reserved for no other
4530	5395	mapping. Default value is 256 pages.
	5396	+
	5397	+ stack_depot_disable= [KNL]
	5398	+ Setting this to true through kernel command line will
	5399	+ disable the stack depot thereby saving the static memory
	5400	+ consumed by the stack hash table. By default this is set
	5401	+ to false.
4531	5402
4532	5403	stacktrace [FTRACE]
4533	5404	Enabled the stack tracer on boot up.
..	..	@@ -4603,10 +5474,15 @@
4603	5474	/sys/power/pm_test). Only available when CONFIG_PM_DEBUG
4604	5475	is set. Default value is 5.
4605	5476
	5477	+ svm= [PPC]
	5478	+ Format: { on \| off \| y \| n \| 1 \| 0 }
	5479	+ This parameter controls use of the Protected
	5480	+ Execution Facility on pSeries.
	5481	+
4606	5482	swapaccount=[0\|1]
4607	5483	[KNL] Enable accounting of swap in memory resource
4608	5484	controller if no parameter or 1 is given or disable
4609		- it if 0 is given (See Documentation/cgroup-v1/memory.txt)
	5485	+ it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
4610	5486
4611	5487	swiotlb= [ARM,IA-64,PPC,MIPS,X86]
4612	5488	Format: { <int> \| force \| noforce }
..	..	@@ -4616,6 +5492,15 @@
4616	5492	noforce -- Never use bounce buffers (for debugging)
4617	5493
4618	5494	switches= [HW,M68k]
	5495	+
	5496	+ sysctl.*= [KNL]
	5497	+ Set a sysctl parameter, right before loading the init
	5498	+ process, as if the value was written to the respective
	5499	+ /proc/sys/... file. Both '.' and '/' are recognized as
	5500	+ separators. Unrecognized parameters and invalid values
	5501	+ are reported in the kernel log. Sysctls registered
	5502	+ later by a loaded module cannot be set this way.
	5503	+ Example: sysctl.vm.swappiness=40
4619	5504
4620	5505	sysfs.deprecated=0\|1 [KNL]
4621	5506	Enable/disable old style sysfs layout for old udev
..	..	@@ -4636,7 +5521,7 @@
4636	5521	Set the number of tcp_metrics_hash slots.
4637	5522	Default value is 8192 or 16384 depending on total
4638	5523	ram pages. This is used to specify the TCP metrics
4639		- cache size. See Documentation/networking/ip-sysctl.txt
	5524	+ cache size. See Documentation/networking/ip-sysctl.rst
4640	5525	"tcp_no_metrics_save" section for more details.
4641	5526
4642	5527	tdfx= [HW,DRM]
..	..	@@ -4681,27 +5566,6 @@
4681	5566	Force threading of all interrupt handlers except those
4682	5567	marked explicitly IRQF_NO_THREAD.
4683	5568
4684		- tmem [KNL,XEN]
4685		- Enable the Transcendent memory driver if built-in.
4686		-
4687		- tmem.cleancache=0\|1 [KNL, XEN]
4688		- Default is on (1). Disable the usage of the cleancache
4689		- API to send anonymous pages to the hypervisor.
4690		-
4691		- tmem.frontswap=0\|1 [KNL, XEN]
4692		- Default is on (1). Disable the usage of the frontswap
4693		- API to send swap pages to the hypervisor. If disabled
4694		- the selfballooning and selfshrinking are force disabled.
4695		-
4696		- tmem.selfballooning=0\|1 [KNL, XEN]
4697		- Default is on (1). Disable the driving of swap pages
4698		- to the hypervisor.
4699		-
4700		- tmem.selfshrinking=0\|1 [KNL, XEN]
4701		- Default is on (1). Partial swapoff that immediately
4702		- transfers pages from Xen hypervisor back to the
4703		- kernel based on different criteria.
4704		-
4705	5569	topology= [S390]
4706	5570	Format: {off \| on}
4707	5571	Specify if the kernel should make use of the cpu
..	..	@@ -4715,6 +5579,17 @@
4715	5579	Specify if the kernel should ignore (off)
4716	5580	topology updates sent by the hypervisor to this
4717	5581	LPAR.
	5582	+
	5583	+ torture.disable_onoff_at_boot= [KNL]
	5584	+ Prevent the CPU-hotplug component of torturing
	5585	+ until after init has spawned.
	5586	+
	5587	+ torture.ftrace_dump_at_shutdown= [KNL]
	5588	+ Dump the ftrace buffer at torture-test shutdown,
	5589	+ even if there were no errors. This can be a
	5590	+ very costly operation when many torture tests
	5591	+ are running concurrently, especially on systems
	5592	+ with rotating-rust storage.
4718	5593
4719	5594	tp720= [HW,PS2]
4720	5595
..	..	@@ -4805,6 +5680,16 @@
4805	5680	[x86] unstable: mark the TSC clocksource as unstable, this
4806	5681	marks the TSC unconditionally unstable at bootup and
4807	5682	avoids any further wobbles once the TSC watchdog notices.
	5683	+ [x86] nowatchdog: disable clocksource watchdog. Used
	5684	+ in situations with strict latency requirements (where
	5685	+ interruptions from clocksource watchdog are not
	5686	+ acceptable).
	5687	+
	5688	+ tsc_early_khz= [X86] Skip early TSC calibration and use the given
	5689	+ value instead. Useful when the early TSC frequency discovery
	5690	+ procedure is not reliable, such as on overclocked systems
	5691	+ with CPUID.16h support and partial CPUID.15h support.
	5692	+ Format: <unsigned int>
4808	5693
4809	5694	tsx= [X86] Control Transactional Synchronization
4810	5695	Extensions (TSX) feature in Intel processors that
..	..	@@ -4904,7 +5789,8 @@
4904	5789	usbcore.authorized_default=
4905	5790	[USB] Default USB device authorization:
4906	5791	(default -1 = authorized except for wireless USB,
4907		- 0 = not authorized, 1 = authorized)
	5792	+ 0 = not authorized, 1 = authorized, 2 = authorized
	5793	+ if device connected to internal port)
4908	5794
4909	5795	usbcore.autosuspend=
4910	5796	[USB] The autosuspend time delay (in seconds) used
..	..	@@ -5111,7 +5997,7 @@
5111	5997	vector=percpu: enable percpu vector domain
5112	5998
5113	5999	video= [FB] Frame buffer configuration
5114		- See Documentation/fb/modedb.txt.
	6000	+ See Documentation/fb/modedb.rst.
5115	6001
5116	6002	video.brightness_switch_enabled= [0,1]
5117	6003	If set to 1, on receiving an ACPI notify event
..	..	@@ -5139,11 +6025,23 @@
5139	6025	Can be used multiple times for multiple devices.
5140	6026
5141	6027	vga= [BOOT,X86-32] Select a particular video mode
5142		- See Documentation/x86/boot.txt and
5143		- Documentation/svga.txt.
	6028	+ See Documentation/x86/boot.rst and
	6029	+ Documentation/admin-guide/svga.rst.
5144	6030	Use vga=ask for menu.
5145	6031	This is actually a boot loader parameter; the value is
5146	6032	passed to the kernel using a special protocol.
	6033	+
	6034	+ vm_debug[=options] [KNL] Available with CONFIG_DEBUG_VM=y.
	6035	+ May slow down system boot speed, especially when
	6036	+ enabled on systems with a large amount of memory.
	6037	+ All options are enabled by default, and this
	6038	+ interface is meant to allow for selectively
	6039	+ enabling or disabling specific virtual memory
	6040	+ debugging features.
	6041	+
	6042	+ Available options are:
	6043	+ P Enable page structure init time poisoning
	6044	+ - Disable all of the above options
5147	6045
5148	6046	vmalloc=nn[KMG] [KNL,BOOT] Forces the vmalloc area to have an exact
5149	6047	size of <nn>. This can be used to increase the
..	..	@@ -5173,7 +6071,12 @@
5173	6071	targets for exploits that can control RIP.
5174	6072
5175	6073	emulate [default] Vsyscalls turn into traps and are
5176		- emulated reasonably safely.
	6074	+ emulated reasonably safely. The vsyscall
	6075	+ page is readable.
	6076	+
	6077	+ xonly Vsyscalls turn into traps and are
	6078	+ emulated reasonably safely. The vsyscall
	6079	+ page is not readable.
5177	6080
5178	6081	none Vsyscalls don't work at all. This makes
5179	6082	them quite hard to use for exploits but
..	..	@@ -5229,9 +6132,17 @@
5229	6132	Default: 3 = cyan.
5230	6133
5231	6134	watchdog timers [HW,WDT] For information on watchdog timers,
5232		- see Documentation/watchdog/watchdog-parameters.txt
	6135	+ see Documentation/watchdog/watchdog-parameters.rst
5233	6136	or other driver-specific files in the
5234	6137	Documentation/watchdog/ directory.
	6138	+
	6139	+ watchdog_thresh=
	6140	+ [KNL]
	6141	+ Set the hard lockup detector stall duration
	6142	+ threshold in seconds. The soft lockup detector
	6143	+ threshold is set to twice the value. A value of 0
	6144	+ disables both lockup detectors. Default is 10
	6145	+ seconds.
5235	6146
5236	6147	workqueue.watchdog_thresh=
5237	6148	If CONFIG_WQ_WATCHDOG is configured, workqueue can
..	..	@@ -5311,18 +6222,32 @@
5311	6222	panic() code such as dumping handler.
5312	6223
5313	6224	xen_nopvspin [X86,XEN]
5314		- Disables the ticketlock slowpath using Xen PV
5315		- optimizations.
	6225	+ Disables the qspinlock slowpath using Xen PV optimizations.
	6226	+ This parameter is obsoleted by "nopvspin" parameter, which
	6227	+ has equivalent effect for XEN platform.
5316	6228
5317	6229	xen_nopv [X86]
5318	6230	Disables the PV optimizations forcing the HVM guest to
5319	6231	run as generic HVM guest with no PV drivers.
	6232	+ This option is obsoleted by the "nopv" option, which
	6233	+ has equivalent effect for XEN platform.
	6234	+
	6235	+ xen_no_vector_callback
	6236	+ [KNL,X86,XEN] Disable the vector callback for Xen
	6237	+ event channel interrupts.
5320	6238
5321	6239	xen_scrub_pages= [XEN]
5322	6240	Boolean option to control scrubbing pages before giving them back
5323	6241	to Xen, for use by other domains. Can be also changed at runtime
5324	6242	with /sys/devices/system/xen_memory/xen_memory0/scrub_pages.
5325	6243	Default value controlled with CONFIG_XEN_SCRUB_PAGES_DEFAULT.
	6244	+
	6245	+ xen_timer_slop= [X86-64,XEN]
	6246	+ Set the timer slop (in nanoseconds) for the virtual Xen
	6247	+ timers (default is 100000). This adjusts the minimum
	6248	+ delta of virtualized Xen timers, where lower values
	6249	+ improve timer resolution at the expense of processing
	6250	+ more timer interrupts.
5326	6251
5327	6252	xen.balloon_boot_timeout= [XEN]
5328	6253	The time (in seconds) to wait before giving up to boot
..	..	@@ -5339,11 +6264,56 @@
5339	6264	After which time (jiffies) the event handling loop
5340	6265	should start to delay EOI handling. Default is 2.
5341	6266
	6267	+ xen.fifo_events= [XEN]
	6268	+ Boolean parameter to disable using fifo event handling
	6269	+ even if available. Normally fifo event handling is
	6270	+ preferred over the 2-level event handling, as it is
	6271	+ fairer and the number of possible event channels is
	6272	+ much higher. Default is on (use fifo events).
	6273	+
	6274	+ nopv= [X86,XEN,KVM,HYPER_V,VMWARE]
	6275	+ Disables the PV optimizations forcing the guest to run
	6276	+ as generic guest with no PV drivers. Currently support
	6277	+ XEN HVM, KVM, HYPER_V and VMWARE guest.
	6278	+
	6279	+ nopvspin [X86,XEN,KVM]
	6280	+ Disables the qspinlock slow path using PV optimizations
	6281	+ which allow the hypervisor to 'idle' the guest on lock
	6282	+ contention.
	6283	+
5342	6284	xirc2ps_cs= [NET,PCMCIA]
5343	6285	Format:
5344	6286	<irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
	6287	+
	6288	+ xive= [PPC]
	6289	+ By default on POWER9 and above, the kernel will
	6290	+ natively use the XIVE interrupt controller. This option
	6291	+ allows the fallback firmware mode to be used:
	6292	+
	6293	+ off Fallback to firmware control of XIVE interrupt
	6294	+ controller on both pseries and powernv
	6295	+ platforms. Only useful on POWER9 and above.
5345	6296
5346	6297	xhci-hcd.quirks [USB,KNL]
5347	6298	A hex value specifying bitmask with supplemental xhci
5348	6299	host controller quirks. Meaning of each bit can be
5349	6300	consulted in header drivers/usb/host/xhci.h.
	6301	+
	6302	+ xmon [PPC]
	6303	+ Format: { early \| on \| rw \| ro \| off }
	6304	+ Controls if xmon debugger is enabled. Default is off.
	6305	+ Passing only "xmon" is equivalent to "xmon=early".
	6306	+ early Call xmon as early as possible on boot; xmon
	6307	+ debugger is called from setup_arch().
	6308	+ on xmon debugger hooks will be installed so xmon
	6309	+ is only called on a kernel crash. Default mode,
	6310	+ i.e. either "ro" or "rw" mode, is controlled
	6311	+ with CONFIG_XMON_DEFAULT_RO_MODE.
	6312	+ rw xmon debugger hooks will be installed so xmon
	6313	+ is called only on a kernel crash, mode is write,
	6314	+ meaning SPR registers, memory and, other data
	6315	+ can be written using xmon commands.
	6316	+ ro same as "rw" option above but SPR registers,
	6317	+ memory, and other data can't be written using
	6318	+ xmon commands.
	6319	+ off xmon is disabled.