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| author | Davidlohr Bueso <davidlohr@hp.com> | 2014-07-11 14:00:06 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-07-16 14:57:13 +0200 |
| commit | 5db6c6fefb1ca0e81e3bd6dd8998bf51c453d823 (patch) | |
| tree | dde571797891c57f73656cbbde9bc950831ef6a0 /kernel/Kconfig.locks | |
| parent | 4badad352a6bb202ec68afa7a574c0bb961e5ebc (diff) | |
| download | lwn-5db6c6fefb1ca0e81e3bd6dd8998bf51c453d823.tar.gz lwn-5db6c6fefb1ca0e81e3bd6dd8998bf51c453d823.zip | |
locking/rwsem: Add CONFIG_RWSEM_SPIN_ON_OWNER
Just like with mutexes (CONFIG_MUTEX_SPIN_ON_OWNER),
encapsulate the dependencies for rwsem optimistic spinning.
No logical changes here as it continues to depend on both
SMP and the XADD algorithm variant.
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Acked-by: Jason Low <jason.low2@hp.com>
[ Also make it depend on ARCH_SUPPORTS_ATOMIC_RMW. ]
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1405112406-13052-2-git-send-email-davidlohr@hp.com
Cc: aswin@hp.com
Cc: Chris Mason <clm@fb.com>
Cc: Davidlohr Bueso <davidlohr@hp.com>
Cc: Josef Bacik <jbacik@fusionio.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Waiman Long <Waiman.Long@hp.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/Kconfig.locks')
| -rw-r--r-- | kernel/Kconfig.locks | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks index 81907941d921..76768ee812b2 100644 --- a/kernel/Kconfig.locks +++ b/kernel/Kconfig.locks @@ -227,6 +227,10 @@ config MUTEX_SPIN_ON_OWNER def_bool y depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW +config RWSEM_SPIN_ON_OWNER + def_bool y + depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW + config ARCH_USE_QUEUE_RWLOCK bool |