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powerpc: define __smp_xxx 

This defines __smp_xxx barriers for powerpc
for use by virtualization.

smp_xxx barriers are removed as they are
defined correctly by asm-generic/barriers.h

This reduces the amount of arch-specific boiler-plate code.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Boqun Feng <boqun.feng@gmail.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
This commit is contained in:
Michael S. Tsirkin 2015-12-27 15:04:42 +02:00
parent a9e4252a9b
commit 003472a93a
1 changed files with 8 additions and 16 deletions
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24
arch/powerpc/include/asm/barrier.h
View File

@ -44,19 +44,11 @@
#define dma_rmb() __lwsync()
#define dma_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory")
#ifdef CONFIG_SMP
#define smp_lwsync() __lwsync()
#define __smp_lwsync() __lwsync()
#define smp_mb() mb()
#define smp_rmb() __lwsync()
#define smp_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory")
#else
#define smp_lwsync() barrier()
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#endif /* CONFIG_SMP */
#define __smp_mb() mb()
#define __smp_rmb() __lwsync()
#define __smp_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory")
/*
* This is a barrier which prevents following instructions from being
@ -67,18 +59,18 @@
#define data_barrier(x) \
asm volatile("twi 0,%0,0; isync" : : "r" (x) : "memory");
#define smp_store_release(p, v) \
#define __smp_store_release(p, v) \
do { \
compiletime_assert_atomic_type(*p); \
smp_lwsync(); \
__smp_lwsync(); \
WRITE_ONCE(*p, v); \
} while (0)
#define smp_load_acquire(p) \
#define __smp_load_acquire(p) \
({ \
typeof(*p) ___p1 = READ_ONCE(*p); \
compiletime_assert_atomic_type(*p); \
smp_lwsync(); \
__smp_lwsync(); \
___p1; \
})