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authorWaiman Long <longman@redhat.com>2019-05-20 16:59:00 -0400
committerIngo Molnar <mingo@kernel.org>2019-06-17 12:27:54 +0200
commitc71fd893f614f205dbc050d60299cc5496491c19 (patch)
treed1286d64684cbad1bf2ff02c55321bcac040b776 /lib/Kconfig.debug
parent69d927bba39517d0980462efc051875b7f4db185 (diff)
downloadlinux-c71fd893f614f205dbc050d60299cc5496491c19.tar.bz2
locking/rwsem: Make owner available even if !CONFIG_RWSEM_SPIN_ON_OWNER
The owner field in the rw_semaphore structure is used primarily for optimistic spinning. However, identifying the rwsem owner can also be helpful in debugging as well as tracing locking related issues when analyzing crash dump. The owner field may also store state information that can be important to the operation of the rwsem. So the owner field is now made a permanent member of the rw_semaphore structure irrespective of CONFIG_RWSEM_SPIN_ON_OWNER. Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Will Deacon <will.deacon@arm.com> Cc: huang ying <huang.ying.caritas@gmail.com> Link: https://lkml.kernel.org/r/20190520205918.22251-2-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug8
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index cbdfae379896..417bdd9e80fb 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1095,7 +1095,7 @@ config PROVE_LOCKING
select DEBUG_SPINLOCK
select DEBUG_MUTEXES
select DEBUG_RT_MUTEXES if RT_MUTEXES
- select DEBUG_RWSEMS if RWSEM_SPIN_ON_OWNER
+ select DEBUG_RWSEMS
select DEBUG_WW_MUTEX_SLOWPATH
select DEBUG_LOCK_ALLOC
select TRACE_IRQFLAGS
@@ -1199,10 +1199,10 @@ config DEBUG_WW_MUTEX_SLOWPATH
config DEBUG_RWSEMS
bool "RW Semaphore debugging: basic checks"
- depends on DEBUG_KERNEL && RWSEM_SPIN_ON_OWNER
+ depends on DEBUG_KERNEL
help
- This debugging feature allows mismatched rw semaphore locks and unlocks
- to be detected and reported.
+ This debugging feature allows mismatched rw semaphore locks
+ and unlocks to be detected and reported.
config DEBUG_LOCK_ALLOC
bool "Lock debugging: detect incorrect freeing of live locks"