[PATCH 2/2] locking/rwsem: Disable optimistic spinning for PA-RISC

Davidlohr Bueso
2014-06-06T15:56:25Z

PA-RISC's cmpxchg is not save against normal stores and the code used
for optimistic spinning is known broken because of this.

Disable for now.

[Changelog from PeterZ]
Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
---
kernel/Kconfig.locks | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index e4c3162..125c77a 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -226,7 +226,7 @@ config MUTEX_SPIN_ON_OWNER

config RWSEM_SPIN_ON_OWNER
def_bool y
- depends on SMP && RWSEM_XCHGADD_ALGORITHM
+ depends on SMP && RWSEM_XCHGADD_ALGORITHM && !PARISC

config ARCH_USE_QUEUE_RWLOCK
bool
--
1.8.1.4