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Commit 003472a9 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin
Browse files

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: default avatarMichael S. Tsirkin <mst@redhat.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarBoqun Feng <boqun.feng@gmail.com>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
parent a9e4252a

arch/powerpc/include/asm/barrier.h

+8 −16
Original line number Diff line number Diff line
@@ -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;								\

})