RfC: fueword(9) and casueword(9)

[Eric van Gyzen]

On 10/21/2014 05:45, Konstantin Belousov wrote:
> @@ -921,7 +933,9 @@ do_lock_normal(struct thread *td, struct umutex *m, uint32_t flags,
>  	 * can fault on any access.
>  	 */
>  	for (;;) {
> -		owner = fuword32(__DEVOLATILE(void *, &m->m_owner));
> +		rv = fueword32(__DEVOLATILE(void *, &m->m_owner), &owner);
> +		if (error == -1)
> +			return (EFAULT);

rv is assigned, but error is tested.

I only reviewed kern_umtx.c, and very quickly.  I'll try to review more
thoroughly later today.

Eric