On Mon, Aug 03, 2015 at 06:02:24PM +0100, Will Deacon wrote:
> +/*
> + * The idea here is to build acquire/release variants by adding explicit
> + * barriers on top of the relaxed variant. In the case where the relaxed
> + * variant is already fully ordered, no additional barriers are needed.
> + */
> +#define __atomic_op_acquire(ret_t, op, ...) \
> +({ \
> + ret_t __ret = op##_relaxed(__VA_ARGS__); \
Do you really need ret_t? Can't we use typeof() on the expression?
> + smp_mb__after_atomic(); \
> + __ret; \
> +})
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