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Commit e121d64e authored by Byungchul Park's avatar Byungchul Park Committed by Ingo Molnar
Browse files

locking/lockdep: Introduce CONFIG_BOOTPARAM_LOCKDEP_CROSSRELEASE_FULLSTACK=y 



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

Suggested-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarByungchul 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: default avatarIngo Molnar <mingo@kernel.org>
parent 2dcd5adf

kernel/locking/lockdep.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

lib/Kconfig.debug

+15 −0
Original line number Diff line number Diff line
@@ -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