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Commit c4a09ff7 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Remove the now-obsolete PROVE_RCU_REPEATEDLY Kconfig option 



The PROVE_RCU_REPEATEDLY Kconfig option was initially added due to
the volume of messages from PROVE_RCU: Doing just one per boot would
have required excessive numbers of boots to locate them all.  However,
PROVE_RCU messages are now relatively rare, so there is no longer any
reason to need more than one such message per boot.  This commit therefore
removes the PROVE_RCU_REPEATEDLY Kconfig option.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
parent 4e4bea74

kernel/locking/lockdep.c

+0 −4
Original line number Diff line number Diff line
@@ -4490,10 +4490,6 @@ void lockdep_rcu_suspicious(const char *file, const int line, const char *s) 
{

	struct task_struct *curr = current;



#ifndef CONFIG_PROVE_RCU_REPEATEDLY

	if (!debug_locks_off())

		return;

#endif /* #ifdef CONFIG_PROVE_RCU_REPEATEDLY */

	/* Note: the following can be executed concurrently, so be careful. */

	pr_warn("\n");

	pr_warn("=============================\n");

kernel/rcu/tree_plugin.h

+1 −3
Original line number Diff line number Diff line
@@ -79,9 +79,7 @@ static void __init rcu_bootup_announce_oddness(void) 
		pr_info("\tHierarchical RCU autobalancing is disabled.\n");

	if (IS_ENABLED(CONFIG_RCU_FAST_NO_HZ))

		pr_info("\tRCU dyntick-idle grace-period acceleration is enabled.\n");

	if (IS_ENABLED(CONFIG_PROVE_RCU_REPEATEDLY))

		pr_info("\tRCU lockdep checking is permanently enabled.\n");

	else if (IS_ENABLED(CONFIG_PROVE_RCU))

	if (IS_ENABLED(CONFIG_PROVE_RCU))

		pr_info("\tRCU lockdep checking is enabled.\n");

	if (RCU_NUM_LVLS >= 4)

		pr_info("\tFour(or more)-level hierarchy is enabled.\n");

lib/Kconfig.debug

+0 −14
Original line number Diff line number Diff line
@@ -1306,20 +1306,6 @@ menu "RCU Debugging" 
config PROVE_RCU

	def_bool PROVE_LOCKING



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 SPARSE_RCU_POINTER

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

	default n

tools/testing/selftests/rcutorture/configs/rcu/TINY02

+0 −1
Original line number Diff line number Diff line
@@ -8,7 +8,6 @@ CONFIG_NO_HZ_IDLE=n 
CONFIG_NO_HZ_FULL=n

CONFIG_RCU_TRACE=y

CONFIG_PROVE_LOCKING=y

CONFIG_PROVE_RCU_REPEATEDLY=y

#CHECK#CONFIG_PROVE_RCU=y

CONFIG_DEBUG_LOCK_ALLOC=y

CONFIG_DEBUG_OBJECTS=y

tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt

+0 −1
Original line number Diff line number Diff line
@@ -13,7 +13,6 @@ CONFIG_NO_HZ_FULL -- Do two, one with partial CPU enablement. 
CONFIG_PREEMPT -- Do half.  (First three and #8.)

CONFIG_PROVE_LOCKING -- Do several, covering CONFIG_DEBUG_LOCK_ALLOC=y and not.

CONFIG_PROVE_RCU -- Hardwired to CONFIG_PROVE_LOCKING.

CONFIG_PROVE_RCU_REPEATEDLY -- Do one.

CONFIG_RCU_BOOST -- one of PREEMPT_RCU.

CONFIG_RCU_FANOUT -- Cover hierarchy, but overlap with others.

CONFIG_RCU_FANOUT_LEAF -- Do one non-default.