1/*
2 * arch/alpha/lib/dec_and_lock.c
3 *
4 * ll/sc version of atomic_dec_and_lock()
5 *
6 */
7
8#include <linux/spinlock.h>
9#include <linux/atomic.h>
10
11  asm (".text					\n\
12	.global _atomic_dec_and_lock		\n\
13	.ent _atomic_dec_and_lock		\n\
14	.align	4				\n\
15_atomic_dec_and_lock:				\n\
16	.prologue 0				\n\
171:	ldl_l	$1, 0($16)			\n\
18	subl	$1, 1, $1			\n\
19	beq	$1, 2f				\n\
20	stl_c	$1, 0($16)			\n\
21	beq	$1, 4f				\n\
22	mb					\n\
23	clr	$0				\n\
24	ret					\n\
252:	br	$29, 3f				\n\
263:	ldgp	$29, 0($29)			\n\
27	br	$atomic_dec_and_lock_1..ng	\n\
28	.subsection 2				\n\
294:	br	1b				\n\
30	.previous				\n\
31	.end _atomic_dec_and_lock");
32
33static int __used atomic_dec_and_lock_1(atomic_t *atomic, spinlock_t *lock)
34{
35	/* Slow path */
36	spin_lock(lock);
37	if (atomic_dec_and_test(atomic))
38		return 1;
39	spin_unlock(lock);
40	return 0;
41}
42