Re: [PATCH 2/2] target: use RCU_INIT_POINTER() when NULLing.

[Christoph Hellwig]

On Mon, May 02, 2016 at 10:57:38AM -0700, Paul E. McKenney wrote:
> -#define rcu_assign_pointer(p, v) smp_store_release(&p, RCU_INITIALIZER(v))
> +#define rcu_assign_pointer(p, v) \
> +({ \
> +	uintptr_t _r_a_p__v = (uintptr_t)(v); \
> +	\
> +	if (__builtin_constant_p(v) && (_r_a_p__v) == (uintptr_t)NULL) \
> +		WRITE_ONCE((p), (typeof(p))(_r_a_p__v)); \
> +	else \
> +		smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
> +	_r_a_p__v; \
> +})

Can't we turn it into an inline (would need different calling
conventions for p, though).