kvm: arm64: Convert kvm_set_s2pte_readonly() from inline asm to cmpxchg()
To take advantage of the LSE atomic instructions and also make the code cleaner, convert the kvm_set_s2pte_readonly() function to use the more generic cmpxchg(). Cc: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by:Will Deacon <will.deacon@arm.com> Reviewed-by:
Christoffer Dall <christoffer.dall@linaro.org> Acked-by:
Mark Rutland <mark.rutland@arm.com> Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com>
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