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Commit 2f03e3ca authored by Dave Hansen's avatar Dave Hansen Committed by Paul E. McKenney
Browse files

rcu: Consolidate debugging Kconfig options 



The RCU-related debugging Kconfig options are in two different places,
and consume too much screen real estate.  This commit therefore
consolidates them into their own menu.

Signed-off-by: default avatarDave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent b44f6656

lib/Kconfig.debug

+59 −55
Original line number Diff line number Diff line
@@ -605,61 +605,6 @@ config PROVE_LOCKING 


	 For more details, see Documentation/lockdep-design.txt.



config PROVE_RCU

	bool "RCU debugging: prove RCU correctness"

	depends on PROVE_LOCKING

	default n

	help

	 This feature enables lockdep extensions that check for correct

	 use of RCU APIs.  This is currently under development.  Say Y

	 if you want to debug RCU usage or help work on the PROVE_RCU

	 feature.



	 Say N if you are unsure.



config PROVE_RCU_REPEATEDLY

	bool "RCU debugging: don't disable PROVE_RCU on first splat"

	depends on PROVE_RCU

	default n

	help

	 By itself, PROVE_RCU will disable checking upon issuing the

	 first warning (or "splat").  This feature prevents such

	 disabling, allowing multiple RCU-lockdep warnings to be printed

	 on a single reboot.



	 Say Y to allow multiple RCU-lockdep warnings per boot.



	 Say N if you are unsure.



config PROVE_RCU_DELAY

	bool "RCU debugging: preemptible RCU race provocation"

	depends on DEBUG_KERNEL && PREEMPT_RCU

	default n

	help

	 There is a class of races that involve an unlikely preemption

	 of __rcu_read_unlock() just after ->rcu_read_lock_nesting has

	 been set to INT_MIN.  This feature inserts a delay at that

	 point to increase the probability of these races.



	 Say Y to increase probability of preemption of __rcu_read_unlock().



	 Say N if you are unsure.



config SPARSE_RCU_POINTER

	bool "RCU debugging: sparse-based checks for pointer usage"

	default n

	help

	 This feature enables the __rcu sparse annotation for

	 RCU-protected pointers.  This annotation will cause sparse

	 to flag any non-RCU used of annotated pointers.  This can be

	 helpful when debugging RCU usage.  Please note that this feature

	 is not intended to enforce code cleanliness; it is instead merely

	 a debugging aid.



	 Say Y to make sparse flag questionable use of RCU-protected pointers



	 Say N if you are unsure.



config LOCKDEP

	bool

	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
@@ -937,6 +882,63 @@ config BOOT_PRINTK_DELAY 
	  BOOT_PRINTK_DELAY also may cause LOCKUP_DETECTOR to detect

	  what it believes to be lockup conditions.



menu "RCU Debugging"



config PROVE_RCU

	bool "RCU debugging: prove RCU correctness"

	depends on PROVE_LOCKING

	default n

	help

	 This feature enables lockdep extensions that check for correct

	 use of RCU APIs.  This is currently under development.  Say Y

	 if you want to debug RCU usage or help work on the PROVE_RCU

	 feature.



	 Say N if you are unsure.



config PROVE_RCU_REPEATEDLY

	bool "RCU debugging: don't disable PROVE_RCU on first splat"

	depends on PROVE_RCU

	default n

	help

	 By itself, PROVE_RCU will disable checking upon issuing the

	 first warning (or "splat").  This feature prevents such

	 disabling, allowing multiple RCU-lockdep warnings to be printed

	 on a single reboot.



	 Say Y to allow multiple RCU-lockdep warnings per boot.



	 Say N if you are unsure.



config PROVE_RCU_DELAY

	bool "RCU debugging: preemptible RCU race provocation"

	depends on DEBUG_KERNEL && PREEMPT_RCU

	default n

	help

	 There is a class of races that involve an unlikely preemption

	 of __rcu_read_unlock() just after ->rcu_read_lock_nesting has

	 been set to INT_MIN.  This feature inserts a delay at that

	 point to increase the probability of these races.



	 Say Y to increase probability of preemption of __rcu_read_unlock().



	 Say N if you are unsure.



config SPARSE_RCU_POINTER

	bool "RCU debugging: sparse-based checks for pointer usage"

	default n

	help

	 This feature enables the __rcu sparse annotation for

	 RCU-protected pointers.  This annotation will cause sparse

	 to flag any non-RCU used of annotated pointers.  This can be

	 helpful when debugging RCU usage.  Please note that this feature

	 is not intended to enforce code cleanliness; it is instead merely

	 a debugging aid.



	 Say Y to make sparse flag questionable use of RCU-protected pointers



	 Say N if you are unsure.



config RCU_TORTURE_TEST

	tristate "torture tests for RCU"

	depends on DEBUG_KERNEL
@@ -1015,6 +1017,8 @@ config RCU_TRACE 
	  Say Y here if you want to enable RCU tracing

	  Say N if you are unsure.



endmenu # "RCU Debugging"



config KPROBES_SANITY_TEST

	bool "Kprobes sanity tests"

	depends on DEBUG_KERNEL