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Given that this atomic operation will be used by both risc-v and aarch64, let's not duplicate code across the two targets. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20180508151437.4232-5-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>