arm64: bitops: patch in lse instructions when supported by the CPU

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On CPUs which support the LSE atomic instructions introduced in ARMv8.1,
it makes sense to use them in preference to ll/sc sequences.

This patch introduces runtime patching of our bitops functions so that
LSE atomic instructions are used instead.

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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This commit is contained in:

Will Deacon 2015-02-12 04:17:37 +00:00

parent 81bb5c6420

commit 084f903727

2 changed files with 45 additions and 21 deletions

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23

arch/arm64/include/asm/lse.h

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43

arch/arm64/lib/bitops.S

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