arm64: cmpxchg: avoid "cc" clobber in ll/sc routines

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We can perform the cmpxchg comparison using eor and cbnz which avoids
the "cc" clobber for the ll/sc case and consequently for the LSE case
where we may have to fall-back on the ll/sc code at runtime.

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 14:26:59 +01:00

parent e9a4b79565

commit 0bc671d3f4

2 changed files with 8 additions and 10 deletions

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14

arch/arm64/include/asm/atomic_ll_sc.h

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4

arch/arm64/include/asm/atomic_lse.h

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