atomics: Add header comment so spin_unlock_wait()

	raw_spin_trylock_irqsave(spinlock_check(lock), flags); \

})

/**

 * spin_unlock_wait - Interpose between successive critical sections

 * @lock: the spinlock whose critical sections are to be interposed.

 *

 * Semantically this is equivalent to a spin_lock() immediately

 * followed by a spin_unlock().  However, most architectures have

 * more efficient implementations in which the spin_unlock_wait()

 * cannot block concurrent lock acquisition, and in some cases

 * where spin_unlock_wait() does not write to the lock variable.

 * Nevertheless, spin_unlock_wait() can have high overhead, so if

 * you feel the need to use it, please check to see if there is

 * a better way to get your job done.

 *

 * The ordering guarantees provided by spin_unlock_wait() are:

 *

 * 1.  All accesses preceding the spin_unlock_wait() happen before

 *     any accesses in later critical sections for this same lock.

 * 2.  All accesses following the spin_unlock_wait() happen after

 *     any accesses in earlier critical sections for this same lock.

 */

static __always_inline void spin_unlock_wait(spinlock_t *lock)

{

	raw_spin_unlock_wait(&lock->rlock);