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arm64: barrier: Implement smp_cond_load_relaxed

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We can provide an implementation of smp_cond_load_relaxed using READ_ONCE
and __cmpwait_relaxed.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: kdrag0n <dragon@khronodragon.com>
Signed-off-by: Danny Lin <danny@kdrag0n.dev>
This commit is contained in:
Will Deacon 2018-01-31 15:55:24 +00:00 committed by Adithya R
parent f1a4cb9827
commit 5f0386c971
1 changed files with 13 additions and 0 deletions
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13
arch/arm64/include/asm/barrier.h
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@ -127,6 +127,19 @@ do { \
__u.__val; \
})
#define smp_cond_load_relaxed(ptr, cond_expr) \
({ \
typeof(ptr) __PTR = (ptr); \
typeof(*ptr) VAL; \
for (;;) { \
VAL = READ_ONCE(*__PTR); \
if (cond_expr) \
break; \
__cmpwait_relaxed(__PTR, VAL); \
} \
VAL; \
})
#define smp_cond_load_acquire(ptr, cond_expr) \
({ \
typeof(ptr) __PTR = (ptr); \