arm64: cmpxchg: avoid memory barrier on comparison failure

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cmpxchg doesn't require memory barrier semantics when the value
comparison fails, so make the barrier conditional on success.

Reviewed-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Will Deacon 2015-05-29 14:47:59 +01:00

parent 0bc671d3f4

commit 4e39715f4b

1 changed files with 22 additions and 26 deletions

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48

arch/arm64/include/asm/atomic_ll_sc.h

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