atomic.h: add atomic64 cmpxchg, xchg and add_unless to alpha

	return result;

}

#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))

#define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))

#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))

#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))

#define atomic_xchg(v, new) (xchg(&((v)->counter), new))

/**

 * atomic_add_unless - add unless the number is a given value

 * @v: pointer of type atomic_t

 * @a: the amount to add to v...

 * @u: ...unless v is equal to u.

 *

 * Atomically adds @a to @v, so long as it was not @u.

 * Returns non-zero if @v was not @u, and zero otherwise.

 */

#define atomic_add_unless(v, a, u)				\

({								\

	int c, old;						\

	__typeof__((v)->counter) c, old;			\

	c = atomic_read(v);					\

	while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \

	for (;;) {						\

		if (unlikely(c == (u)))				\

			break;					\

		old = atomic_cmpxchg((v), c, c + (a));		\

		if (likely(old == c))				\

			break;					\

		c = old;					\

	}							\

	c != (u);						\

})

#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)

/**

 * atomic64_add_unless - add unless the number is a given value

 * @v: pointer of type atomic64_t

 * @a: the amount to add to v...

 * @u: ...unless v is equal to u.

 *

 * Atomically adds @a to @v, so long as it was not @u.

 * Returns non-zero if @v was not @u, and zero otherwise.

 */

#define atomic64_add_unless(v, a, u)				\

({								\

	__typeof__((v)->counter) c, old;			\

	c = atomic64_read(v);					\

	for (;;) {						\

		if (unlikely(c == (u)))				\

			break;					\

		old = atomic64_cmpxchg((v), c, c + (a));	\

		if (likely(old == c))				\

			break;					\

		c = old;					\

	}							\

	c != (u);						\

})

#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)

#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)

#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)