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locking/lockdep: Introduce CONFIG_BOOTPARAM_LOCKDEP_CROSSRELEASE_FULLSTACK=y 

Add a Kconfig knob that enables the lockdep "crossrelease_fullstack" boot parameter.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Byungchul Park <byungchul.park@lge.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: amir73il@gmail.com
Cc: axboe@kernel.dk
Cc: darrick.wong@oracle.com
Cc: david@fromorbit.com
Cc: hch@infradead.org
Cc: idryomov@gmail.com
Cc: johan@kernel.org
Cc: johannes.berg@intel.com
Cc: kernel-team@lge.com
Cc: linux-block@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: linux-xfs@vger.kernel.org
Cc: oleg@redhat.com
Cc: tj@kernel.org
Link: http://lkml.kernel.org/r/1508921765-15396-7-git-send-email-byungchul.park@lge.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
hifive-unleashed-5.1
Byungchul Park 2017-10-25 17:56:02 +09:00 committed by Ingo Molnar
parent 2dcd5adfb7
commit e121d64e16
2 changed files with 19 additions and 0 deletions
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4
kernel/locking/lockdep.c
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@ -76,7 +76,11 @@ module_param(lock_stat, int, 0644);
#define lock_stat 0
#endif
#ifdef CONFIG_BOOTPARAM_LOCKDEP_CROSSRELEASE_FULLSTACK
static int crossrelease_fullstack = 1;
#else
static int crossrelease_fullstack;
#endif
static int __init allow_crossrelease_fullstack(char *str)
{
crossrelease_fullstack = 1;

15
lib/Kconfig.debug
View File

@ -1179,6 +1179,21 @@ config LOCKDEP_COMPLETIONS
A deadlock caused by wait_for_completion() and complete() can be
detected by lockdep using crossrelease feature.
config BOOTPARAM_LOCKDEP_CROSSRELEASE_FULLSTACK
bool "Enable the boot parameter, crossrelease_fullstack"
depends on LOCKDEP_CROSSRELEASE
default n
help
The lockdep "cross-release" feature needs to record stack traces
(of calling functions) for all acquisitions, for eventual later
use during analysis. By default only a single caller is recorded,
because the unwind operation can be very expensive with deeper
stack chains.
However a boot parameter, crossrelease_fullstack, was
introduced since sometimes deeper traces are required for full
analysis. This option turns on the boot parameter.
config DEBUG_LOCKDEP
bool "Lock dependency engine debugging"
depends on DEBUG_KERNEL && LOCKDEP