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powerpc: reuse asm-generic/barrier.h 

On powerpc read_barrier_depends, smp_read_barrier_depends
smp_store_mb(), smp_mb__before_atomic and smp_mb__after_atomic match the
asm-generic variants exactly. Drop the local definitions and pull in
asm-generic/barrier.h instead.

This is in preparation to refactoring this code area.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Michael S. Tsirkin 2015-12-21 09:22:18 +02:00
parent 53a05ac15e
commit fbd7ec0236
1 changed files with 2 additions and 7 deletions
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9
arch/powerpc/include/asm/barrier.h
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@ -34,8 +34,6 @@
#define rmb() __asm__ __volatile__ ("sync" : : : "memory")
#define wmb() __asm__ __volatile__ ("sync" : : : "memory")
#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); smp_mb(); } while (0)
#ifdef __SUBARCH_HAS_LWSYNC
# define SMPWMB LWSYNC
#else
@ -60,9 +58,6 @@
#define smp_wmb() barrier()
#endif /* CONFIG_SMP */
#define read_barrier_depends() do { } while (0)
#define smp_read_barrier_depends() do { } while (0)
/*
* This is a barrier which prevents following instructions from being
* started until the value of the argument x is known. For example, if
@ -87,8 +82,8 @@ do { \
___p1; \
})
#define smp_mb__before_atomic() smp_mb()
#define smp_mb__after_atomic() smp_mb()
#define smp_mb__before_spinlock() smp_mb()
#include <asm-generic/barrier.h>
#endif /* _ASM_POWERPC_BARRIER_H */