* [PATCH tip/core/rcu 09/15] powerpc: Fix smp_mb__before_spinlock()
[not found] ` <1431466701-653-1-git-send-email-paulmck@linux.vnet.ibm.com>
@ 2015-05-12 21:38 ` Paul E. McKenney
0 siblings, 0 replies; only message in thread
From: Paul E. McKenney @ 2015-05-12 21:38 UTC (permalink / raw)
To: linux-kernel
Cc: tglx, laijs, bobby.prani, peterz, fweisbec, dvhart, josh, rostedt,
oleg, dhowells, edumazet, mathieu.desnoyers, akpm,
Paul E. McKenney, linuxppc-dev, mingo
From: "Paul E. McKenney" <paulmck@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@linux.vnet.ibm.com>
Cc: <linuxppc-dev@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
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2015-05-12 21:38 ` [PATCH tip/core/rcu 09/15] powerpc: Fix smp_mb__before_spinlock() Paul E. McKenney
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