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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/init/Kconfig
....@@ -1,3 +1,4 @@
1
+# SPDX-License-Identifier: GPL-2.0-only
12 config DEFCONFIG_LIST
23 	string
34 	depends on !UML
....@@ -5,19 +6,39 @@
56 	default "/lib/modules/$(shell,uname -r)/.config"
67 	default "/etc/kernel-config"
78 	default "/boot/config-$(shell,uname -r)"
8
-	default ARCH_DEFCONFIG
9
-	default "arch/$(ARCH)/defconfig"
9
+	default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
10
+
11
+config CC_VERSION_TEXT
12
+	string
13
+	default "$(CC_VERSION_TEXT)"
14
+	help
15
+	  This is used in unclear ways:
16
+
17
+	  - Re-run Kconfig when the compiler is updated
18
+	    The 'default' property references the environment variable,
19
+	    CC_VERSION_TEXT so it is recorded in include/config/auto.conf.cmd.
20
+	    When the compiler is updated, Kconfig will be invoked.
21
+
22
+	  - Ensure full rebuild when the compier is updated
23
+	    include/linux/kconfig.h contains this option in the comment line so
24
+	    fixdep adds include/config/cc/version/text.h into the auto-generated
25
+	    dependency. When the compiler is updated, syncconfig will touch it
26
+	    and then every file will be rebuilt.
1027 
1128 config CC_IS_GCC
12
-	def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
29
+	def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q gcc)
1330 
1431 config GCC_VERSION
1532 	int
16
-	default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC
33
+	default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC
1734 	default 0
1835 
36
+config LD_VERSION
37
+	int
38
+	default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh)
39
+
1940 config CC_IS_CLANG
20
-	def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
41
+	def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q clang)
2142 
2243 config LD_IS_LLD
2344 	def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD)
....@@ -30,11 +51,33 @@
3051 	int
3152 	default $(shell,$(srctree)/scripts/lld-version.sh $(LD))
3253 
54
+config CC_CAN_LINK
55
+	bool
56
+	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m64-flag)) if 64BIT
57
+	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m32-flag))
58
+
59
+config CC_CAN_LINK_STATIC
60
+	bool
61
+	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m64-flag) -static) if 64BIT
62
+	default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m32-flag) -static)
63
+
3364 config CC_HAS_ASM_GOTO
3465 	def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC))
3566 
67
+config CC_HAS_ASM_GOTO_OUTPUT
68
+	depends on CC_HAS_ASM_GOTO
69
+	def_bool $(success,echo 'int foo(int x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | $(CC) -x c - -c -o /dev/null)
70
+
71
+config CC_HAS_ASM_GOTO_TIED_OUTPUT
72
+	depends on CC_HAS_ASM_GOTO_OUTPUT
73
+	# Detect buggy gcc and clang, fixed in gcc-11 clang-14.
74
+	def_bool $(success,echo 'int foo(int *x) { asm goto (".long (%l[bar]) - .": "+m"(*x) ::: bar); return *x; bar: return 0; }' | $CC -x c - -c -o /dev/null)
75
+
3676 config TOOLS_SUPPORT_RELR
3777 	def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
78
+
79
+config CC_HAS_ASM_INLINE
80
+	def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
3881 
3982 config CONSTRUCTORS
4083 	bool
....@@ -43,7 +86,7 @@
4386 config IRQ_WORK
4487 	bool
4588 
46
-config BUILDTIME_EXTABLE_SORT
89
+config BUILDTIME_TABLE_SORT
4790 	bool
4891 
4992 config THREAD_INFO_IN_TASK
....@@ -88,6 +131,30 @@
88131 	  here. If you are a user/distributor, say N here to exclude useless
89132 	  drivers to be distributed.
90133 
134
+config WERROR
135
+	bool "Compile the kernel with warnings as errors"
136
+	default y
137
+	help
138
+	  A kernel build should not cause any compiler warnings, and this
139
+	  enables the '-Werror' flag to enforce that rule by default.
140
+
141
+	  However, if you have a new (or very old) compiler with odd and
142
+	  unusual warnings, or you have some architecture with problems,
143
+	  you may need to disable this config option in order to
144
+	  successfully build the kernel.
145
+
146
+	  If in doubt, say Y.
147
+
148
+config UAPI_HEADER_TEST
149
+	bool "Compile test UAPI headers"
150
+	depends on HEADERS_INSTALL && CC_CAN_LINK
151
+	help
152
+	  Compile test headers exported to user-space to ensure they are
153
+	  self-contained, i.e. compilable as standalone units.
154
+
155
+	  If you are a developer or tester and want to ensure the exported
156
+	  headers are self-contained, say Y here. Otherwise, choose N.
157
+
91158 config LOCALVERSION
92159 	string "Local version - append to kernel release"
93160 	help
....@@ -120,13 +187,13 @@
120187 	  which is done within the script "scripts/setlocalversion".)
121188 
122189 config BUILD_SALT
123
-       string "Build ID Salt"
124
-       default ""
125
-       help
126
-          The build ID is used to link binaries and their debug info. Setting
127
-          this option will use the value in the calculation of the build id.
128
-          This is mostly useful for distributions which want to ensure the
129
-          build is unique between builds. It's safe to leave the default.
190
+	string "Build ID Salt"
191
+	default ""
192
+	help
193
+	  The build ID is used to link binaries and their debug info. Setting
194
+	  this option will use the value in the calculation of the build id.
195
+	  This is mostly useful for distributions which want to ensure the
196
+	  build is unique between builds. It's safe to leave the default.
130197 
131198 config HAVE_KERNEL_GZIP
132199 	bool
....@@ -146,13 +213,16 @@
146213 config HAVE_KERNEL_LZ4
147214 	bool
148215 
216
+config HAVE_KERNEL_ZSTD
217
+	bool
218
+
149219 config HAVE_KERNEL_UNCOMPRESSED
150220 	bool
151221 
152222 choice
153223 	prompt "Kernel compression mode"
154224 	default KERNEL_GZIP
155
-	depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_UNCOMPRESSED
225
+	depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_ZSTD || HAVE_KERNEL_UNCOMPRESSED
156226 	help
157227 	  The linux kernel is a kind of self-extracting executable.
158228 	  Several compression algorithms are available, which differ
....@@ -231,6 +301,16 @@
231301 	  is about 8% bigger than LZO. But the decompression speed is
232302 	  faster than LZO.
233303 
304
+config KERNEL_ZSTD
305
+	bool "ZSTD"
306
+	depends on HAVE_KERNEL_ZSTD
307
+	help
308
+	  ZSTD is a compression algorithm targeting intermediate compression
309
+	  with fast decompression speed. It will compress better than GZIP and
310
+	  decompress around the same speed as LZO, but slower than LZ4. You
311
+	  will need at least 192 KB RAM or more for booting. The zstd command
312
+	  line tool is required for compression.
313
+
234314 config KERNEL_UNCOMPRESSED
235315 	bool "None"
236316 	depends on HAVE_KERNEL_UNCOMPRESSED
....@@ -242,6 +322,16 @@
242322 	  and jump right at uncompressed kernel image.
243323 
244324 endchoice
325
+
326
+config DEFAULT_INIT
327
+	string "Default init path"
328
+	default ""
329
+	help
330
+	  This option determines the default init for the system if no init=
331
+	  option is passed on the kernel command line. If the requested path is
332
+	  not present, we will still then move on to attempting further
333
+	  locations (e.g. /sbin/init, etc). If this is empty, we will just use
334
+	  the fallback list when init= is not passed.
245335 
246336 config DEFAULT_HOSTNAME
247337 	string "Default hostname"
....@@ -271,7 +361,7 @@
271361 
272362 config SYSVIPC
273363 	bool "System V IPC"
274
-	---help---
364
+	help
275365 	  Inter Process Communication is a suite of library functions and
276366 	  system calls which let processes (running programs) synchronize and
277367 	  exchange information. It is generally considered to be a good thing,
....@@ -293,7 +383,7 @@
293383 config POSIX_MQUEUE
294384 	bool "POSIX Message Queues"
295385 	depends on NET
296
-	---help---
386
+	help
297387 	  POSIX variant of message queues is a part of IPC. In POSIX message
298388 	  queues every message has a priority which decides about succession
299389 	  of receiving it by a process. If you want to compile and run
....@@ -311,6 +401,18 @@
311401 	depends on POSIX_MQUEUE
312402 	depends on SYSCTL
313403 	default y
404
+
405
+config WATCH_QUEUE
406
+	bool "General notification queue"
407
+	default n
408
+	help
409
+
410
+	  This is a general notification queue for the kernel to pass events to
411
+	  userspace by splicing them into pipes.  It can be used in conjunction
412
+	  with watches for key/keyring change notifications and device
413
+	  notifications.
414
+
415
+	  See Documentation/watch_queue.rst
314416 
315417 config CROSS_MEMORY_ATTACH
316418 	bool "Enable process_vm_readv/writev syscalls"
....@@ -338,29 +440,15 @@
338440 	help
339441 	  Enable auditing infrastructure that can be used with another
340442 	  kernel subsystem, such as SELinux (which requires this for
341
-	  logging of avc messages output). Does not do system-call
342
-	  auditing without CONFIG_AUDITSYSCALL.
443
+	  logging of avc messages output).  System call auditing is included
444
+	  on architectures which support it.
343445 
344446 config HAVE_ARCH_AUDITSYSCALL
345447 	bool
346448 
347449 config AUDITSYSCALL
348
-	bool "Enable system-call auditing support"
450
+	def_bool y
349451 	depends on AUDIT && HAVE_ARCH_AUDITSYSCALL
350
-	default y if SECURITY_SELINUX
351
-	help
352
-	  Enable low-overhead system-call auditing infrastructure that
353
-	  can be used independently or with another kernel subsystem,
354
-	  such as SELinux.
355
-
356
-config AUDIT_WATCH
357
-	def_bool y
358
-	depends on AUDITSYSCALL
359
-	select FSNOTIFY
360
-
361
-config AUDIT_TREE
362
-	def_bool y
363
-	depends on AUDITSYSCALL
364452 	select FSNOTIFY
365453 
366454 source "kernel/irq/Kconfig"
....@@ -405,6 +493,7 @@
405493 	bool "Full dynticks CPU time accounting"
406494 	depends on HAVE_CONTEXT_TRACKING
407495 	depends on HAVE_VIRT_CPU_ACCOUNTING_GEN
496
+	depends on GENERIC_CLOCKEVENTS
408497 	select VIRT_CPU_ACCOUNTING
409498 	select CONTEXT_TRACKING
410499 	help
....@@ -436,6 +525,25 @@
436525 	def_bool y
437526 	depends on IRQ_TIME_ACCOUNTING || PARAVIRT_TIME_ACCOUNTING
438527 	depends on SMP
528
+
529
+config SCHED_THERMAL_PRESSURE
530
+	bool
531
+	default y if ARM && ARM_CPU_TOPOLOGY
532
+	default y if ARM64
533
+	depends on SMP
534
+	depends on CPU_FREQ_THERMAL
535
+	help
536
+	  Select this option to enable thermal pressure accounting in the
537
+	  scheduler. Thermal pressure is the value conveyed to the scheduler
538
+	  that reflects the reduction in CPU compute capacity resulted from
539
+	  thermal throttling. Thermal throttling occurs when the performance of
540
+	  a CPU is capped due to high operating temperatures.
541
+
542
+	  If selected, the scheduler will be able to balance tasks accordingly,
543
+	  i.e. put less load on throttled CPUs than on non/less throttled ones.
544
+
545
+	  This requires the architecture to implement
546
+	  arch_set_thermal_pressure() and arch_get_thermal_pressure().
439547 
440548 config BSD_PROCESS_ACCT
441549 	bool "BSD Process Accounting"
....@@ -522,7 +630,7 @@
522630 	  have cpu.pressure, memory.pressure, and io.pressure files,
523631 	  which aggregate pressure stalls for the grouped tasks only.
524632 
525
-	  For more details see Documentation/accounting/psi.txt.
633
+	  For more details see Documentation/accounting/psi.rst.
526634 
527635 	  Say N if unsure.
528636 
....@@ -568,8 +676,7 @@
568676 
569677 config IKCONFIG
570678 	tristate "Kernel .config support"
571
-	select BUILD_BIN2C
572
-	---help---
679
+	help
573680 	  This option enables the complete Linux kernel ".config" file
574681 	  contents to be saved in the kernel. It provides documentation
575682 	  of which kernel options are used in a running kernel or in an
....@@ -582,7 +689,7 @@
582689 config IKCONFIG_PROC
583690 	bool "Enable access to .config through /proc/config.gz"
584691 	depends on IKCONFIG && PROC_FS
585
-	---help---
692
+	help
586693 	  This option enables access to the kernel configuration file
587694 	  through /proc/config.gz.
588695 
....@@ -634,7 +741,7 @@
634741 	  with more CPUs. Therefore this value is used only when the sum of
635742 	  contributions is greater than the half of the default kernel ring
636743 	  buffer as defined by LOG_BUF_SHIFT. The default values are set
637
-	  so that more than 64 CPUs are needed to trigger the allocation.
744
+	  so that more than 16 CPUs are needed to trigger the allocation.
638745 
639746 	  Also this option is ignored when "log_buf_len" kernel parameter is
640747 	  used as it forces an exact (power of two) size of the ring buffer.
....@@ -754,6 +861,9 @@
754861 config ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
755862 	bool
756863 
864
+config CC_HAS_INT128
865
+	def_bool !$(cc-option,$(m64-flag) -D__SIZEOF_INT128__=0) && 64BIT
866
+
757867 #
758868 # For architectures that know their GCC __int128 support is sound
759869 #
....@@ -794,8 +904,8 @@
794904 	  use with process control subsystems such as Cpusets, CFS, memory
795905 	  controls or device isolation.
796906 	  See
797
-		- Documentation/scheduler/sched-design-CFS.txt	(CFS)
798
-		- Documentation/cgroup-v1/ (features for grouping, isolation
907
+		- Documentation/scheduler/sched-design-CFS.rst	(CFS)
908
+		- Documentation/admin-guide/cgroup-v1/ (features for grouping, isolation
799909 					  and resource control)
800910 
801911 	  Say N if unsure.
....@@ -803,7 +913,7 @@
803913 if CGROUPS
804914 
805915 config PAGE_COUNTER
806
-       bool
916
+	bool
807917 
808918 config MEMCG
809919 	bool "Memory controller"
....@@ -813,24 +923,9 @@
813923 	  Provides control over the memory footprint of tasks in a cgroup.
814924 
815925 config MEMCG_SWAP
816
-	bool "Swap controller"
926
+	bool
817927 	depends on MEMCG && SWAP
818
-	help
819
-	  Provides control over the swap space consumed by tasks in a cgroup.
820
-
821
-config MEMCG_SWAP_ENABLED
822
-	bool "Swap controller enabled by default"
823
-	depends on MEMCG_SWAP
824928 	default y
825
-	help
826
-	  Memory Resource Controller Swap Extension comes with its price in
827
-	  a bigger memory consumption. General purpose distribution kernels
828
-	  which want to enable the feature but keep it disabled by default
829
-	  and let the user enable it by swapaccount=1 boot command line
830
-	  parameter should have this option unselected.
831
-	  For those who want to have the feature enabled by default should
832
-	  select this option (if, for some reason, they need to disable it
833
-	  then swapaccount=0 does the trick).
834929 
835930 config MEMCG_KMEM
836931 	bool
....@@ -841,7 +936,7 @@
841936 	bool "IO controller"
842937 	depends on BLOCK
843938 	default n
844
-	---help---
939
+	help
845940 	Generic block IO controller cgroup interface. This is the common
846941 	cgroup interface which should be used by various IO controlling
847942 	policies.
....@@ -854,18 +949,10 @@
854949 	This option only enables generic Block IO controller infrastructure.
855950 	One needs to also enable actual IO controlling logic/policy. For
856951 	enabling proportional weight division of disk bandwidth in CFQ, set
857
-	CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
952
+	CONFIG_BFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
858953 	CONFIG_BLK_DEV_THROTTLING=y.
859954 
860
-	See Documentation/cgroup-v1/blkio-controller.txt for more information.
861
-
862
-config DEBUG_BLK_CGROUP
863
-	bool "IO controller debugging"
864
-	depends on BLK_CGROUP
865
-	default n
866
-	---help---
867
-	Enable some debugging help. Currently it exports additional stat
868
-	files in a cgroup which can be useful for debugging.
955
+	See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
869956 
870957 config CGROUP_WRITEBACK
871958 	bool
....@@ -895,7 +982,7 @@
895982 	  tasks running within the fair group scheduler.  Groups with no limit
896983 	  set are considered to be unconstrained and will run with no
897984 	  restriction.
898
-	  See Documentation/scheduler/sched-bwc.txt for more information.
985
+	  See Documentation/scheduler/sched-bwc.rst for more information.
899986 
900987 config RT_GROUP_SCHED
901988 	bool "Group scheduling for SCHED_RR/FIFO"
....@@ -906,7 +993,7 @@
906993 	  to task groups. If enabled, it will also make it impossible to
907994 	  schedule realtime tasks for non-root users until you allocate
908995 	  realtime bandwidth for them.
909
-	  See Documentation/scheduler/sched-rt-group.txt for more information.
996
+	  See Documentation/scheduler/sched-rt-group.rst for more information.
910997 
911998 endif #CGROUP_SCHED
912999 
....@@ -944,7 +1031,7 @@
9441031 	  PIDs controller is designed to stop this from happening.
9451032 
9461033 	  It should be noted that organisational operations (such as attaching
947
-	  to a cgroup hierarchy will *not* be blocked by the PIDs controller),
1034
+	  to a cgroup hierarchy) will *not* be blocked by the PIDs controller,
9481035 	  since the PIDs limit only affects a process's ability to fork, not to
9491036 	  attach to a cgroup.
9501037 
....@@ -1019,7 +1106,8 @@
10191106 	help
10201107 	  This option extends the perf per-cpu mode to restrict monitoring
10211108 	  to threads which belong to the cgroup specified and run on the
1022
-	  designated cpu.
1109
+	  designated cpu.  Or this can be used to have cgroup ID in samples
1110
+	  so that it can monitor performance events among cgroups.
10231111 
10241112 	  Say N if unsure.
10251113 
....@@ -1073,6 +1161,14 @@
10731161 	  In this namespace tasks see different info provided with the
10741162 	  uname() system call
10751163 
1164
+config TIME_NS
1165
+	bool "TIME namespace"
1166
+	depends on GENERIC_VDSO_TIME_NS
1167
+	default y
1168
+	help
1169
+	  In this namespace boottime and monotonic clocks can be set.
1170
+	  The time will keep going with the same pace.
1171
+
10761172 config IPC_NS
10771173 	bool "IPC namespace"
10781174 	depends on (SYSVIPC || POSIX_MQUEUE)
....@@ -1116,6 +1212,7 @@
11161212 config CHECKPOINT_RESTORE
11171213 	bool "Checkpoint/restore support"
11181214 	select PROC_CHILDREN
1215
+	select KCMP
11191216 	default n
11201217 	help
11211218 	  Enables additional kernel features in a sake of checkpoint/restore.
....@@ -1137,29 +1234,16 @@
11371234 	  desktop applications.  Task group autogeneration is currently based
11381235 	  upon task session.
11391236 
1140
-config SCHED_TUNE
1141
-	bool "Boosting for CFS tasks (EXPERIMENTAL)"
1142
-	depends on !UCLAMP_TASK
1143
-	depends on SMP
1144
-	help
1145
-	  This option enables support for task classification using a new
1146
-	  cgroup controller, schedtune. Schedtune allows tasks to be given
1147
-	  a boost value and marked as latency-sensitive or not. This option
1148
-	  provides the "schedtune" controller.
1149
-
1150
-	  This new controller:
1151
-	  1. allows only a two layers hierarchy, where the root defines the
1152
-	     system-wide boost value and its direct childrens define each one a
1153
-	     different "class of tasks" to be boosted with a different value
1154
-	  2. supports up to 16 different task classes, each one which could be
1155
-	     configured with a different boost value
1156
-
1157
-	  Latency-sensitive tasks are not subject to energy-aware wakeup
1158
-	  task placement. The boost value assigned to tasks is used to
1159
-	  influence task placement and CPU frequency selection (if
1160
-	  utilization-driven frequency selection is in use).
1161
-
1162
-	  If unsure, say N.
1237
+config RT_SOFTINT_OPTIMIZATION
1238
+       bool "Improve RT scheduling during long softint execution"
1239
+       depends on ARM64
1240
+       depends on SMP
1241
+       default n
1242
+       help
1243
+         Enable an optimization which tries to avoid placing RT tasks on CPUs
1244
+	 occupied by nonpreemptible tasks, such as a long softint, or CPUs
1245
+	 which may soon block preemptions, such as a CPU running a ksoftirq
1246
+	 thread which handles slow softints.
11631247 
11641248 config SYSFS_DEPRECATED
11651249 	bool "Enable deprecated sysfs features to support old userspace tools"
....@@ -1232,16 +1316,9 @@
12321316 
12331317 config INITRD_ASYNC
12341318 	bool "Initrd async"
1319
+	depends on NO_GKI
12351320 	help
12361321 	  Init ramdisk async, can reduce kernel init time.
1237
-
1238
-config ROCKCHIP_ONE_INITRD
1239
-	bool "Detect only one initrd"
1240
-	depends on ARCH_ROCKCHIP
1241
-	default ARCH_ROCKCHIP
1242
-	help
1243
-	  RK bootloader does not put a correct size to cmdline.
1244
-	  Directly return when we get a good initrd.
12451322 
12461323 endif
12471324 
....@@ -1254,24 +1331,41 @@
12541331 	  initcall_nr_threads default is 0, which disable intcall async.
12551332 	  initcall_nr_threads=-1, auto selected the number of threads.
12561333 
1334
+config BOOT_CONFIG
1335
+	bool "Boot config support"
1336
+	select BLK_DEV_INITRD
1337
+	help
1338
+	  Extra boot config allows system admin to pass a config file as
1339
+	  complemental extension of kernel cmdline when booting.
1340
+	  The boot config file must be attached at the end of initramfs
1341
+	  with checksum, size and magic word.
1342
+	  See <file:Documentation/admin-guide/bootconfig.rst> for details.
1343
+
1344
+	  If unsure, say Y.
1345
+
12571346 choice
12581347 	prompt "Compiler optimization level"
12591348 	default CC_OPTIMIZE_FOR_PERFORMANCE
12601349 
12611350 config CC_OPTIMIZE_FOR_PERFORMANCE
1262
-	bool "Optimize for performance"
1351
+	bool "Optimize for performance (-O2)"
12631352 	help
12641353 	  This is the default optimization level for the kernel, building
12651354 	  with the "-O2" compiler flag for best performance and most
12661355 	  helpful compile-time warnings.
12671356 
1268
-config CC_OPTIMIZE_FOR_SIZE
1269
-	bool "Optimize for size"
1357
+config CC_OPTIMIZE_FOR_PERFORMANCE_O3
1358
+	bool "Optimize more for performance (-O3)"
1359
+	depends on ARC
12701360 	help
1271
-	  Enabling this option will pass "-Os" instead of "-O2" to
1272
-	  your compiler resulting in a smaller kernel.
1361
+	  Choosing this option will pass "-O3" to your compiler to optimize
1362
+	  the kernel yet more for performance.
12731363 
1274
-	  If unsure, say N.
1364
+config CC_OPTIMIZE_FOR_SIZE
1365
+	bool "Optimize for size (-Os)"
1366
+	help
1367
+	  Choosing this option will pass "-Os" to your compiler resulting
1368
+	  in a smaller kernel.
12751369 
12761370 endchoice
12771371 
....@@ -1289,7 +1383,6 @@
12891383 	bool "Dead code and data elimination (EXPERIMENTAL)"
12901384 	depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION
12911385 	depends on EXPERT
1292
-	depends on !(FUNCTION_TRACER && CC_IS_GCC && GCC_VERSION < 40800)
12931386 	depends on $(cc-option,-ffunction-sections -fdata-sections)
12941387 	depends on $(ld-option,--gc-sections)
12951388 	help
....@@ -1303,6 +1396,12 @@
13031396 	  silently broken kernel if the required annotations are not
13041397 	  present. This option is not well tested yet, so use at your
13051398 	  own risk.
1399
+
1400
+config LD_ORPHAN_WARN
1401
+	def_bool y
1402
+	depends on ARCH_WANT_LD_ORPHAN_WARN
1403
+	depends on !LD_IS_LLD || LLD_VERSION >= 110000
1404
+	depends on $(ld-option,--orphan-handling=warn)
13061405 
13071406 config SYSCTL
13081407 	bool
....@@ -1343,9 +1442,9 @@
13431442 	select DEBUG_KERNEL
13441443 	help
13451444 	  This option allows certain base kernel options and settings
1346
-          to be disabled or tweaked. This is for specialized
1347
-          environments which can tolerate a "non-standard" kernel.
1348
-          Only use this if you really know what you are doing.
1445
+	  to be disabled or tweaked. This is for specialized
1446
+	  environments which can tolerate a "non-standard" kernel.
1447
+	  Only use this if you really know what you are doing.
13491448 
13501449 config UID16
13511450 	bool "Enable 16-bit UID system calls" if EXPERT
....@@ -1371,7 +1470,7 @@
13711470 config SGETMASK_SYSCALL
13721471 	bool "sgetmask/ssetmask syscalls support" if EXPERT
13731472 	def_bool PARISC || M68K || PPC || MIPS || X86 || SPARC || MICROBLAZE || SUPERH
1374
-	---help---
1473
+	help
13751474 	  sys_sgetmask and sys_ssetmask are obsolete system calls
13761475 	  no longer supported in libc but still enabled by default in some
13771476 	  architectures.
....@@ -1381,29 +1480,12 @@
13811480 config SYSFS_SYSCALL
13821481 	bool "Sysfs syscall support" if EXPERT
13831482 	default y
1384
-	---help---
1483
+	help
13851484 	  sys_sysfs is an obsolete system call no longer supported in libc.
13861485 	  Note that disabling this option is more secure but might break
13871486 	  compatibility with some systems.
13881487 
13891488 	  If unsure say Y here.
1390
-
1391
-config SYSCTL_SYSCALL
1392
-	bool "Sysctl syscall support" if EXPERT
1393
-	depends on PROC_SYSCTL
1394
-	default n
1395
-	select SYSCTL
1396
-	---help---
1397
-	  sys_sysctl uses binary paths that have been found challenging
1398
-	  to properly maintain and use.  The interface in /proc/sys
1399
-	  using paths with ascii names is now the primary path to this
1400
-	  information.
1401
-
1402
-	  Almost nothing using the binary sysctl interface so if you are
1403
-	  trying to save some space it is probably safe to disable this,
1404
-	  making your kernel marginally smaller.
1405
-
1406
-	  If unsure say N here.
14071489 
14081490 config FHANDLE
14091491 	bool "open by fhandle syscalls" if EXPERT
....@@ -1455,11 +1537,11 @@
14551537 	bool "BUG() support" if EXPERT
14561538 	default y
14571539 	help
1458
-          Disabling this option eliminates support for BUG and WARN, reducing
1459
-          the size of your kernel image and potentially quietly ignoring
1460
-          numerous fatal conditions. You should only consider disabling this
1461
-          option for embedded systems with no facilities for reporting errors.
1462
-          Just say Y.
1540
+	  Disabling this option eliminates support for BUG and WARN, reducing
1541
+	  the size of your kernel image and potentially quietly ignoring
1542
+	  numerous fatal conditions. You should only consider disabling this
1543
+	  option for embedded systems with no facilities for reporting errors.
1544
+	  Just say Y.
14631545 
14641546 config ELF_CORE
14651547 	depends on COREDUMP
....@@ -1475,8 +1557,8 @@
14751557 	select I8253_LOCK
14761558 	default y
14771559 	help
1478
-          This option allows to disable the internal PC-Speaker
1479
-          support, saving some memory.
1560
+	  This option allows to disable the internal PC-Speaker
1561
+	  support, saving some memory.
14801562 
14811563 config BASE_FULL
14821564 	default y
....@@ -1561,6 +1643,15 @@
15611643 	  by some high performance threaded applications. Disabling
15621644 	  this option saves about 7k.
15631645 
1646
+config IO_URING
1647
+	bool "Enable IO uring support" if EXPERT
1648
+	select IO_WQ
1649
+	default y
1650
+	help
1651
+	  This option enables support for the io_uring interface, enabling
1652
+	  applications to submit and complete IO through submission and
1653
+	  completion rings that are shared between the kernel and application.
1654
+
15641655 config ADVISE_SYSCALLS
15651656 	bool "Enable madvise/fadvise syscalls" if EXPERT
15661657 	default y
....@@ -1570,6 +1661,16 @@
15701661 	  usage, improving performance. If building an embedded system where no
15711662 	  applications use these syscalls, you can disable this option to save
15721663 	  space.
1664
+
1665
+config HAVE_ARCH_USERFAULTFD_WP
1666
+	bool
1667
+	help
1668
+	  Arch has userfaultfd write protection support
1669
+
1670
+config HAVE_ARCH_USERFAULTFD_MINOR
1671
+	bool
1672
+	help
1673
+	  Arch has userfaultfd minor fault support
15731674 
15741675 config MEMBARRIER
15751676 	bool "Enable membarrier() system call" if EXPERT
....@@ -1584,29 +1685,29 @@
15841685 	  If unsure, say Y.
15851686 
15861687 config KALLSYMS
1587
-	 bool "Load all symbols for debugging/ksymoops" if EXPERT
1588
-	 default y
1589
-	 help
1590
-	   Say Y here to let the kernel print out symbolic crash information and
1591
-	   symbolic stack backtraces. This increases the size of the kernel
1592
-	   somewhat, as all symbols have to be loaded into the kernel image.
1688
+	bool "Load all symbols for debugging/ksymoops" if EXPERT
1689
+	default y
1690
+	help
1691
+	  Say Y here to let the kernel print out symbolic crash information and
1692
+	  symbolic stack backtraces. This increases the size of the kernel
1693
+	  somewhat, as all symbols have to be loaded into the kernel image.
15931694 
15941695 config KALLSYMS_ALL
15951696 	bool "Include all symbols in kallsyms"
15961697 	depends on DEBUG_KERNEL && KALLSYMS
15971698 	help
1598
-	   Normally kallsyms only contains the symbols of functions for nicer
1599
-	   OOPS messages and backtraces (i.e., symbols from the text and inittext
1600
-	   sections). This is sufficient for most cases. And only in very rare
1601
-	   cases (e.g., when a debugger is used) all symbols are required (e.g.,
1602
-	   names of variables from the data sections, etc).
1699
+	  Normally kallsyms only contains the symbols of functions for nicer
1700
+	  OOPS messages and backtraces (i.e., symbols from the text and inittext
1701
+	  sections). This is sufficient for most cases. And only in very rare
1702
+	  cases (e.g., when a debugger is used) all symbols are required (e.g.,
1703
+	  names of variables from the data sections, etc).
16031704 
1604
-	   This option makes sure that all symbols are loaded into the kernel
1605
-	   image (i.e., symbols from all sections) in cost of increased kernel
1606
-	   size (depending on the kernel configuration, it may be 300KiB or
1607
-	   something like this).
1705
+	  This option makes sure that all symbols are loaded into the kernel
1706
+	  image (i.e., symbols from all sections) in cost of increased kernel
1707
+	  size (depending on the kernel configuration, it may be 300KiB or
1708
+	  something like this).
16081709 
1609
-	   Say N unless you really need all symbols.
1710
+	  Say N unless you really need all symbols.
16101711 
16111712 config KALLSYMS_ABSOLUTE_PERCPU
16121713 	bool
....@@ -1634,14 +1735,31 @@
16341735 # end of the "standard kernel features (expert users)" menu
16351736 
16361737 # syscall, maps, verifier
1738
+
1739
+config BPF_LSM
1740
+	bool "LSM Instrumentation with BPF"
1741
+	depends on BPF_EVENTS
1742
+	depends on BPF_SYSCALL
1743
+	depends on SECURITY
1744
+	depends on BPF_JIT
1745
+	help
1746
+	  Enables instrumentation of the security hooks with eBPF programs for
1747
+	  implementing dynamic MAC and Audit Policies.
1748
+
1749
+	  If you are unsure how to answer this question, answer N.
1750
+
16371751 config BPF_SYSCALL
16381752 	bool "Enable bpf() system call"
16391753 	select BPF
16401754 	select IRQ_WORK
1755
+	select TASKS_TRACE_RCU
16411756 	default n
16421757 	help
16431758 	  Enable the bpf() system call that allows to manipulate eBPF
16441759 	  programs and maps via file descriptors.
1760
+
1761
+config ARCH_WANT_DEFAULT_BPF_JIT
1762
+	bool
16451763 
16461764 config BPF_JIT_ALWAYS_ON
16471765 	bool "Permanently enable BPF JIT and remove BPF interpreter"
....@@ -1649,6 +1767,10 @@
16491767 	help
16501768 	  Enables BPF JIT and removes BPF interpreter to avoid
16511769 	  speculative execution of BPF instructions by the interpreter
1770
+
1771
+config BPF_JIT_DEFAULT_ON
1772
+	def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON
1773
+	depends on HAVE_EBPF_JIT && BPF_JIT
16521774 
16531775 config BPF_UNPRIV_DEFAULT_OFF
16541776 	bool "Disable unprivileged BPF by default"
....@@ -1659,6 +1781,8 @@
16591781 	  still reenable it by setting it to 0 later on, or permanently
16601782 	  disable it by setting it to 1 (from which no other transition to
16611783 	  0 is possible anymore).
1784
+
1785
+source "kernel/bpf/preload/Kconfig"
16621786 
16631787 config USERFAULTFD
16641788 	bool "Enable userfaultfd() system call"
....@@ -1672,6 +1796,16 @@
16721796 
16731797 config ARCH_HAS_MEMBARRIER_SYNC_CORE
16741798 	bool
1799
+
1800
+config KCMP
1801
+	bool "Enable kcmp() system call" if EXPERT
1802
+	help
1803
+	  Enable the kernel resource comparison system call. It provides
1804
+	  user-space with the ability to compare two processes to see if they
1805
+	  share a common resource, such as a file descriptor or even virtual
1806
+	  memory space.
1807
+
1808
+	  If unsure, say N.
16751809 
16761810 config RSEQ
16771811 	bool "Enable rseq() system call" if EXPERT
....@@ -1759,12 +1893,12 @@
17591893 	depends on PERF_EVENTS && DEBUG_KERNEL && !PPC
17601894 	select PERF_USE_VMALLOC
17611895 	help
1762
-	 Use vmalloc memory to back perf mmap() buffers.
1896
+	  Use vmalloc memory to back perf mmap() buffers.
17631897 
1764
-	 Mostly useful for debugging the vmalloc code on platforms
1765
-	 that don't require it.
1898
+	  Mostly useful for debugging the vmalloc code on platforms
1899
+	  that don't require it.
17661900 
1767
-	 Say N if unsure.
1901
+	  Say N if unsure.
17681902 
17691903 endmenu
17701904 
....@@ -1786,7 +1920,6 @@
17861920 	default y
17871921 	bool "Enable SLUB debugging support" if EXPERT
17881922 	depends on SLUB && SYSFS
1789
-	select SLUB_SYSFS
17901923 	help
17911924 	  SLUB has extensive debug support features. Disabling these can
17921925 	  result in significant savings in code size. This also disables
....@@ -1869,9 +2002,8 @@
18692002 	  command line.
18702003 
18712004 config SLAB_FREELIST_RANDOM
1872
-	default n
2005
+	bool "Randomize slab freelist"
18732006 	depends on SLAB || SLUB
1874
-	bool "SLAB freelist randomization"
18752007 	help
18762008 	  Randomizes the freelist order used on creating new pages. This
18772009 	  security feature reduces the predictability of the kernel slab
....@@ -1879,19 +2011,45 @@
18792011 
18802012 config SLAB_FREELIST_HARDENED
18812013 	bool "Harden slab freelist metadata"
1882
-	depends on SLUB
2014
+	depends on SLAB || SLUB
18832015 	help
18842016 	  Many kernel heap attacks try to target slab cache metadata and
18852017 	  other infrastructure. This options makes minor performance
1886
-	  sacrifies to harden the kernel slab allocator against common
1887
-	  freelist exploit methods.
2018
+	  sacrifices to harden the kernel slab allocator against common
2019
+	  freelist exploit methods. Some slab implementations have more
2020
+	  sanity-checking than others. This option is most effective with
2021
+	  CONFIG_SLUB.
2022
+
2023
+config SHUFFLE_PAGE_ALLOCATOR
2024
+	bool "Page allocator randomization"
2025
+	default SLAB_FREELIST_RANDOM && ACPI_NUMA
2026
+	help
2027
+	  Randomization of the page allocator improves the average
2028
+	  utilization of a direct-mapped memory-side-cache. See section
2029
+	  5.2.27 Heterogeneous Memory Attribute Table (HMAT) in the ACPI
2030
+	  6.2a specification for an example of how a platform advertises
2031
+	  the presence of a memory-side-cache. There are also incidental
2032
+	  security benefits as it reduces the predictability of page
2033
+	  allocations to compliment SLAB_FREELIST_RANDOM, but the
2034
+	  default granularity of shuffling on the "MAX_ORDER - 1" i.e,
2035
+	  10th order of pages is selected based on cache utilization
2036
+	  benefits on x86.
2037
+
2038
+	  While the randomization improves cache utilization it may
2039
+	  negatively impact workloads on platforms without a cache. For
2040
+	  this reason, by default, the randomization is enabled only
2041
+	  after runtime detection of a direct-mapped memory-side-cache.
2042
+	  Otherwise, the randomization may be force enabled with the
2043
+	  'page_alloc.shuffle' kernel command line parameter.
2044
+
2045
+	  Say Y if unsure.
18882046 
18892047 config SLUB_CPU_PARTIAL
18902048 	default y
18912049 	depends on SLUB && SMP
18922050 	bool "SLUB per cpu partial cache"
18932051 	help
1894
-	  Per cpu partial caches accellerate objects allocation and freeing
2052
+	  Per cpu partial caches accelerate objects allocation and freeing
18952053 	  that is local to a processor at the price of more indeterminism
18962054 	  in the latency of the free. On overflow these caches will be cleared
18972055 	  which requires the taking of locks that may cause latency spikes.
....@@ -1917,7 +2075,7 @@
19172075 	  userspace.  Since that isn't generally a problem on no-MMU systems,
19182076 	  it is normally safe to say Y here.
19192077 
1920
-	  See Documentation/nommu-mmap.txt for more information.
2078
+	  See Documentation/admin-guide/mm/nommu-mmap.rst for more information.
19212079 
19222080 config SYSTEM_DATA_VERIFICATION
19232081 	def_bool n
....@@ -1961,6 +2119,10 @@
19612119 	int
19622120 	default 0 if BASE_FULL
19632121 	default 1 if !BASE_FULL
2122
+
2123
+config MODULE_SIG_FORMAT
2124
+	def_bool n
2125
+	select SYSTEM_DATA_VERIFICATION
19642126 
19652127 menuconfig MODULES
19662128 	bool "Enable loadable module support"
....@@ -2021,6 +2183,14 @@
20212183 	  make them incompatible with the kernel you are running.  If
20222184 	  unsure, say N.
20232185 
2186
+config ASM_MODVERSIONS
2187
+	bool
2188
+	default HAVE_ASM_MODVERSIONS && MODVERSIONS
2189
+	help
2190
+	  This enables module versioning for exported symbols also from
2191
+	  assembly. This can be enabled only when the target architecture
2192
+	  supports it.
2193
+
20242194 config MODULE_REL_CRCS
20252195 	bool
20262196 	depends on MODVERSIONS
....@@ -2036,10 +2206,23 @@
20362206 	  the version).  With this option, such a "srcversion" field
20372207 	  will be created for all modules.  If unsure, say N.
20382208 
2209
+config MODULE_SCMVERSION
2210
+	bool "SCM version for modules"
2211
+	depends on LOCALVERSION_AUTO
2212
+	help
2213
+	  This enables the module attribute "scmversion" which can be used
2214
+	  by developers to identify the SCM version of a given module, e.g.
2215
+	  git sha1 or hg sha1. The SCM version can be queried by modinfo or
2216
+	  via the sysfs node: /sys/modules/MODULENAME/scmversion. This is
2217
+	  useful when the kernel or kernel modules are updated separately
2218
+	  since that causes the vermagic of the kernel and the module to
2219
+	  differ.
2220
+
2221
+	  If unsure, say N.
2222
+
20392223 config MODULE_SIG
20402224 	bool "Module signature verification"
2041
-	depends on MODULES
2042
-	select SYSTEM_DATA_VERIFICATION
2225
+	select MODULE_SIG_FORMAT
20432226 	help
20442227 	  Check modules for valid signatures upon load: the signature
20452228 	  is simply appended to the module. For more information see
....@@ -2048,6 +2231,11 @@
20482231 	  Note that this option adds the OpenSSL development packages as a
20492232 	  kernel build dependency so that the signing tool can use its crypto
20502233 	  library.
2234
+
2235
+	  You should enable this option if you wish to use either
2236
+	  CONFIG_SECURITY_LOCKDOWN_LSM or lockdown functionality imposed via
2237
+	  another LSM - otherwise unsigned modules will be loadable regardless
2238
+	  of the lockdown policy.
20512239 
20522240 	  !!!WARNING!!!  If you enable this option, you MUST make sure that the
20532241 	  module DOES NOT get stripped after being signed.  This includes the
....@@ -2115,7 +2303,6 @@
21152303 
21162304 config MODULE_COMPRESS
21172305 	bool "Compress modules on installation"
2118
-	depends on MODULES
21192306 	help
21202307 
21212308 	  Compresses kernel modules when 'make modules_install' is run; gzip or
....@@ -2151,9 +2338,38 @@
21512338 
21522339 endchoice
21532340 
2341
+config MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
2342
+	bool "Allow loading of modules with missing namespace imports"
2343
+	help
2344
+	  Symbols exported with EXPORT_SYMBOL_NS*() are considered exported in
2345
+	  a namespace. A module that makes use of a symbol exported with such a
2346
+	  namespace is required to import the namespace via MODULE_IMPORT_NS().
2347
+	  There is no technical reason to enforce correct namespace imports,
2348
+	  but it creates consistency between symbols defining namespaces and
2349
+	  users importing namespaces they make use of. This option relaxes this
2350
+	  requirement and lifts the enforcement when loading a module.
2351
+
2352
+	  If unsure, say N.
2353
+
2354
+config UNUSED_SYMBOLS
2355
+	bool "Enable unused/obsolete exported symbols"
2356
+	default y if X86
2357
+	help
2358
+	  Unused but exported symbols make the kernel needlessly bigger.  For
2359
+	  that reason most of these unused exports will soon be removed.  This
2360
+	  option is provided temporarily to provide a transition period in case
2361
+	  some external kernel module needs one of these symbols anyway. If you
2362
+	  encounter such a case in your module, consider if you are actually
2363
+	  using the right API.  (rationale: since nobody in the kernel is using
2364
+	  this in a module, there is a pretty good chance it's actually the
2365
+	  wrong interface to use).  If you really need the symbol, please send a
2366
+	  mail to the linux kernel mailing list mentioning the symbol and why
2367
+	  you really need it, and what the merge plan to the mainline kernel for
2368
+	  your module is.
2369
+
21542370 config TRIM_UNUSED_KSYMS
21552371 	bool "Trim unused exported kernel symbols"
2156
-	depends on MODULES && !UNUSED_SYMBOLS
2372
+	depends on !UNUSED_SYMBOLS
21572373 	help
21582374 	  The kernel and some modules make many symbols available for
21592375 	  other modules to use via EXPORT_SYMBOL() and variants. Depending
....@@ -2214,6 +2430,9 @@
22142430 
22152431 source "kernel/Kconfig.locks"
22162432 
2433
+config ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
2434
+	bool
2435
+
22172436 config ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
22182437 	bool
22192438 
....@@ -2227,4 +2446,6 @@
22272446 config ARCH_HAS_SYSCALL_WRAPPER
22282447 	def_bool n
22292448 
2449
+if !ROCKCHIP_MINI_KERNEL
22302450 source "init/Kconfig.gki"
2451
+endif