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locking/rwsem: Add CONFIG_RWSEM_SPIN_ON_OWNER

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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 <[email protected]>
Acked-by: Jason Low <[email protected]>
[ Also make it depend on ARCH_SUPPORTS_ATOMIC_RMW. ]
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Cc: [email protected]
Cc: Chris Mason <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Josef Bacik <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Waiman Long <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Davidlohr Bueso 2014-07-11 14:00:06 -07:00 • committed by Ingo Molnar
commit 5db6c6fefb
4 changed files with 11 additions and 5 deletions
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4
kernel/Kconfig.locks
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@ -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