arm64: locks: 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 locking functions so that
LSE atomic instructions are used for spinlocks and rwlocks.

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 2015-02-10 03:03:15 +00:00

parent c09d6a04d1

commit 81bb5c6420

1 changed files with 108 additions and 29 deletions

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137

arch/arm64/include/asm/spinlock.h

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