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ARC: cmpxchg/xchg: implement relaxed variants (LLSC config only)

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It only makes sense to do this for the LLSC config

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
This commit is contained in:
Vineet Gupta 2020-05-09 00:15:36 -07:00
parent e188f3330a
commit ddc348c44d
1 changed files with 2 additions and 9 deletions
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11
arch/arc/include/asm/cmpxchg.h
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@ -38,7 +38,7 @@
_prev; \
})
#define arch_cmpxchg(ptr, old, new) \
#define arch_cmpxchg_relaxed(ptr, old, new) \
({ \
__typeof__(ptr) _p_ = (ptr); \
__typeof__(*(ptr)) _o_ = (old); \
@ -47,12 +47,7 @@
\
switch(sizeof((_p_))) { \
case 4: \
/* \
* Explicit full memory barrier needed before/after \
*/ \
smp_mb(); \
_prev_ = __cmpxchg(_p_, _o_, _n_); \
smp_mb(); \
break; \
default: \
BUILD_BUG(); \
@ -108,16 +103,14 @@
_val_; /* get old value */ \
})
#define arch_xchg(ptr, val) \
#define arch_xchg_relaxed(ptr, val) \
({ \
__typeof__(ptr) _p_ = (ptr); \
__typeof__(*(ptr)) _val_ = (val); \
\
switch(sizeof(*(_p_))) { \
case 4: \
smp_mb(); \
_val_ = __xchg(_p_, _val_); \
smp_mb(); \
break; \
default: \
BUILD_BUG(); \