arm64: cmpxchg: 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 cmpxchg primitives so that
the LSE cas instruction is used instead.

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 2015-04-23 20:08:49 +01:00

parent c8366ba0fb

commit c342f78217

4 changed files with 98 additions and 66 deletions

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3

arch/arm64/include/asm/atomic.h

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38

arch/arm64/include/asm/atomic_ll_sc.h

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39

arch/arm64/include/asm/atomic_lse.h

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84

arch/arm64/include/asm/cmpxchg.h

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