arm64: cmpxchg_dbl: 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_double primitives
so that the LSE casp 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 2015-05-14 18:05:50 +01:00

parent c342f78217

commit e9a4b79565

3 changed files with 94 additions and 51 deletions

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34

arch/arm64/include/asm/atomic_ll_sc.h

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43

arch/arm64/include/asm/atomic_lse.h

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68

arch/arm64/include/asm/cmpxchg.h

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