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

[David Howells]

paul...@kernel.org 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