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MIPS: New macro smp_mb__before_llsc.

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Replace some instances of smp_llsc_mb() with a new macro
smp_mb__before_llsc().  It is used before ll/sc sequences that are
documented as needing write barrier semantics.

The default implementation of smp_mb__before_llsc() is just smp_llsc_mb(),
so there are no changes in semantics.

Also simplify definition of smp_mb(), smp_rmb(), and smp_wmb() to be just
barrier() in the non-SMP case.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/851/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney
2010-01-08 17:17:43 -08:00
committed by Ralf Baechle
parent ec5380c768
commit f252ffd50c
6 changed files with 32 additions and 25 deletions
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10
arch/mips/include/asm/cmpxchg.h
View File

@ -72,14 +72,14 @@
*/
extern void __cmpxchg_called_with_bad_pointer(void);
#define __cmpxchg(ptr, old, new, barrier) \
#define __cmpxchg(ptr, old, new, pre_barrier, post_barrier) \
({ \
__typeof__(ptr) __ptr = (ptr); \
__typeof__(*(ptr)) __old = (old); \
__typeof__(*(ptr)) __new = (new); \
__typeof__(*(ptr)) __res = 0; \
\
barrier; \
pre_barrier; \
\
switch (sizeof(*(__ptr))) { \
case 4: \
@ -96,13 +96,13 @@ extern void __cmpxchg_called_with_bad_pointer(void);
break; \
} \
\
barrier; \
post_barrier; \
\
__res; \
})
#define cmpxchg(ptr, old, new) __cmpxchg(ptr, old, new, smp_llsc_mb())
#define cmpxchg_local(ptr, old, new) __cmpxchg(ptr, old, new, )
#define cmpxchg(ptr, old, new) __cmpxchg(ptr, old, new, smp_mb__before_llsc(), smp_llsc_mb())
#define cmpxchg_local(ptr, old, new) __cmpxchg(ptr, old, new, , )
#define cmpxchg64(ptr, o, n) \
({ \