locking/rwsem: Add CONFIG_RWSEM_SPIN_ON_OWNER
authorDavidlohr Bueso <davidlohr@hp.com>
Fri, 11 Jul 2014 21:00:06 +0000 (14:00 -0700)
committerIngo Molnar <mingo@kernel.org>
Wed, 16 Jul 2014 12:57:13 +0000 (14:57 +0200)
commit5db6c6fefb1ca0e81e3bd6dd8998bf51c453d823
treedde571797891c57f73656cbbde9bc950831ef6a0
parent4badad352a6bb202ec68afa7a574c0bb961e5ebc
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>
include/linux/rwsem.h
kernel/Kconfig.locks
kernel/locking/rwsem-xadd.c
kernel/locking/rwsem.c