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mips: define __smp_xxx

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This defines __smp_xxx barriers for mips,
for use by virtualization.

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

Note: the only exception is smp_mb__before_llsc which is mips-specific.
We define both the __smp_mb__before_llsc variant (for use in
asm/barriers.h) and smp_mb__before_llsc (for use elsewhere on this
architecture).

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
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 afc22de0c0
commit a60514bae7
1 changed files with 14 additions and 12 deletions
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26
arch/mips/include/asm/barrier.h
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@ -85,20 +85,20 @@
#define wmb() fast_wmb()
#define rmb() fast_rmb()
#if defined(CONFIG_WEAK_ORDERING) && defined(CONFIG_SMP)
#if defined(CONFIG_WEAK_ORDERING)
# ifdef CONFIG_CPU_CAVIUM_OCTEON
# define smp_mb() __sync()
# define smp_rmb() barrier()
# define smp_wmb() __syncw()
# define __smp_mb() __sync()
# define __smp_rmb() barrier()
# define __smp_wmb() __syncw()
# else
# define smp_mb() __asm__ __volatile__("sync" : : :"memory")
# define smp_rmb() __asm__ __volatile__("sync" : : :"memory")
# define smp_wmb() __asm__ __volatile__("sync" : : :"memory")
# define __smp_mb() __asm__ __volatile__("sync" : : :"memory")
# define __smp_rmb() __asm__ __volatile__("sync" : : :"memory")
# define __smp_wmb() __asm__ __volatile__("sync" : : :"memory")
# endif
#else
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define __smp_mb() barrier()
#define __smp_rmb() barrier()
#define __smp_wmb() barrier()
#endif
#if defined(CONFIG_WEAK_REORDERING_BEYOND_LLSC) && defined(CONFIG_SMP)
@ -111,6 +111,7 @@
#ifdef CONFIG_CPU_CAVIUM_OCTEON
#define smp_mb__before_llsc() smp_wmb()
#define __smp_mb__before_llsc() __smp_wmb()
/* Cause previous writes to become visible on all CPUs as soon as possible */
#define nudge_writes() __asm__ __volatile__(".set push\n\t" \
".set arch=octeon\n\t" \
@ -118,11 +119,12 @@
".set pop" : : : "memory")
#else
#define smp_mb__before_llsc() smp_llsc_mb()
#define __smp_mb__before_llsc() smp_llsc_mb()
#define nudge_writes() mb()
#endif
#define smp_mb__before_atomic() smp_mb__before_llsc()
#define smp_mb__after_atomic() smp_llsc_mb()
#define __smp_mb__before_atomic() __smp_mb__before_llsc()
#define __smp_mb__after_atomic() smp_llsc_mb()
#include <asm-generic/barrier.h>