Re: [PATCH tip/core/rcu 1/9] rcu: Upgrade rcu_swap_protected() to rcu_replace()

[David Howells]

paulmck@xxxxxxxxxx wrote:

> +#define rcu_replace(rcu_ptr, ptr, c)					\
> +({									\
> +	typeof(ptr) __tmp = rcu_dereference_protected((rcu_ptr), (c));	\
> +	rcu_assign_pointer((rcu_ptr), (ptr));				\
> +	__tmp;								\
> +})

Does it make sense to actually use xchg() if that's supported by the arch?

David