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由 Will Deacon 提交于
The ARM v8.1 architecture introduces new atomic instructions to the A64 instruction set for things like cmpxchg, so advertise their availability to userspace using a hwcap. Reviewed-by: NSteve Capper <steve.capper@arm.com> Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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