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FRV: Don't make smp_{r, w, }mb() interpolate MEMBAR when CONFIG_SMP=n [try #2]

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Don't make smp_{r,w,}mb() interpolate a MEMBAR instruction when CONFIG_SMP=n as
SMP memory barries on UP systems should interpolate a compiler barrier only.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2008-04-10 16:11:05 +01:00 committed by Linus Torvalds
parent ed9b949f55
commit f17520e1f1
1 changed files with 15 additions and 6 deletions
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21
include/asm-frv/system.h
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@ -179,14 +179,23 @@ do { \
#define mb() asm volatile ("membar" : : :"memory")
#define rmb() asm volatile ("membar" : : :"memory")
#define wmb() asm volatile ("membar" : : :"memory")
#define set_mb(var, value) do { var = value; mb(); } while (0)
#define read_barrier_depends() barrier()
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#define read_barrier_depends() do {} while(0)
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#define smp_read_barrier_depends() read_barrier_depends()
#define set_mb(var, value) \
do { xchg(&var, (value)); } while (0)
#else
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define smp_read_barrier_depends() do {} while(0)
#define set_mb(var, value) \
do { var = (value); barrier(); } while (0)
#endif
#define HARD_RESET_NOW() \
do { \