mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/kernel/rcu/Kconfig.debug
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+# SPDX-License-Identifier: GPL-2.0-only
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 #
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 # RCU-related debugging configuration options
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 #
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 config PROVE_RCU
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 	def_bool PROVE_LOCKING
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+config PROVE_RCU_LIST
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+	bool "RCU list lockdep debugging"
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+	depends on PROVE_RCU && RCU_EXPERT
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+	default n
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+	help
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+	  Enable RCU lockdep checking for list usages. By default it is
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+	  turned off since there are several list RCU users that still
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+	  need to be converted to pass a lockdep expression. To prevent
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+	  false-positive splats, we keep it default disabled but once all
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+	  users are converted, we can remove this config option.
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+
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 config TORTURE_TEST
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 	tristate
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 	default n
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-config RCU_PERF_TEST
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+config RCU_SCALE_TEST
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 	tristate "performance tests for RCU"
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 	depends on DEBUG_KERNEL
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 	select TORTURE_TEST
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 	select SRCU
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 	select TASKS_RCU
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+	select TASKS_RUDE_RCU
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+	select TASKS_TRACE_RCU
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 	default n
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 	help
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 	  This option provides a kernel module that runs performance
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 	select TORTURE_TEST
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 	select SRCU
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 	select TASKS_RCU
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+	select TASKS_RUDE_RCU
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+	select TASKS_TRACE_RCU
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 	default n
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 	help
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 	  This option provides a kernel module that runs torture tests
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 	  Say Y here if you want RCU torture tests to be built into
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 	  the kernel.
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 	  Say M if you want the RCU torture tests to build as a module.
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+	  Say N if you are unsure.
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+
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+config RCU_REF_SCALE_TEST
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+	tristate "Scalability tests for read-side synchronization (RCU and others)"
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+	depends on DEBUG_KERNEL
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+	select TORTURE_TEST
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+	select SRCU
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+	select TASKS_RCU
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+	select TASKS_RUDE_RCU
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+	select TASKS_TRACE_RCU
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+	default n
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+	help
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+	  This option provides a kernel module that runs performance tests
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+	  useful comparing RCU with various read-side synchronization mechanisms.
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+	  The kernel module may be built after the fact on the running kernel to be
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+	  tested, if desired.
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+
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+	  Say Y here if you want these performance tests built into the kernel.
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+	  Say M if you want to build it as a module instead.
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 	  Say N if you are unsure.
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 config RCU_CPU_STALL_TIMEOUT
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 	  Say N here if you need ultimate kernel/user switch latencies
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 	  Say Y if you are unsure
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+config RCU_STRICT_GRACE_PERIOD
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+	bool "Provide debug RCU implementation with short grace periods"
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+	depends on DEBUG_KERNEL && RCU_EXPERT
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+	default n
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+	select PREEMPT_COUNT if PREEMPT=n
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+	help
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+	  Select this option to build an RCU variant that is strict about
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+	  grace periods, making them as short as it can.  This limits
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+	  scalability, destroys real-time response, degrades battery
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+	  lifetime and kills performance.  Don't try this on large
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+	  machines, as in systems with more than about 10 or 20 CPUs.
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+	  But in conjunction with tools like KASAN, it can be helpful
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+	  when looking for certain types of RCU usage bugs, for example,
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+	  too-short RCU read-side critical sections.
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+
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 endmenu # "RCU Debugging"