arm64: kconfig: select HAVE_CMPXCHG_LOCAL
We implement an optimised cmpxchg_local macro, so let the kernel know. Reviewed-by: NSteve Capper <steve.capper@arm.com> Acked-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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