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powerpc: Fix smp_mb__before_spinlock()

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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>
This commit is contained in:
Paul E. McKenney 2015-04-01 08:19:59 -07:00
parent 5ce035fb7d
commit a76ff6884b
1 changed files with 1 additions and 0 deletions
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arch/powerpc/include/asm/barrier.h
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@ -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 */