[PATCH tip/core/rcu 09/15] powerpc: Fix smp_mb__before_spinlock()

[Paul E. McKenney]

From: "Paul E. McKenney" <paulmck at linux.vnet.ibm.com>

Currently, smp_mb__before_spinlock() is defined to be smp_wmb()
in core code, but this is not sufficient on PowerPC.  This patch
therefore supplies an override for the generic definition to
strengthen smp_mb__before_spinlock() to smp_mb(), as is needed
on PowerPC.

Signed-off-by: Paul E. McKenney <paulmck at linux.vnet.ibm.com>
Cc: <linuxppc-dev at lists.ozlabs.org>
---
 arch/powerpc/include/asm/barrier.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h
index a3bf5be111ff..1124f59b8df4 100644
--- a/arch/powerpc/include/asm/barrier.h
+++ b/arch/powerpc/include/asm/barrier.h
@@ -89,5 +89,6 @@ do {									\
 
 #define smp_mb__before_atomic()     smp_mb()
 #define smp_mb__after_atomic()      smp_mb()
+#define smp_mb__before_spinlock()   smp_mb()
 
 #endif /* _ASM_POWERPC_BARRIER_H */
-- 
1.8.1.5