linux/arch/alpha/lib/dec_and_lock.c
Adrian Bunk 3ff6eecca4 remove __attribute_used__
Remove the deprecated __attribute_used__.

[Introduce __section in a few places to silence checkpatch /sam]

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2008-01-28 23:21:18 +01:00

42 lines
809 B
C

/*
* arch/alpha/lib/dec_and_lock.c
*
* ll/sc version of atomic_dec_and_lock()
*
*/
#include <linux/spinlock.h>
#include <asm/atomic.h>
asm (".text \n\
.global _atomic_dec_and_lock \n\
.ent _atomic_dec_and_lock \n\
.align 4 \n\
_atomic_dec_and_lock: \n\
.prologue 0 \n\
1: ldl_l $1, 0($16) \n\
subl $1, 1, $1 \n\
beq $1, 2f \n\
stl_c $1, 0($16) \n\
beq $1, 4f \n\
mb \n\
clr $0 \n\
ret \n\
2: br $29, 3f \n\
3: ldgp $29, 0($29) \n\
br $atomic_dec_and_lock_1..ng \n\
.subsection 2 \n\
4: br 1b \n\
.previous \n\
.end _atomic_dec_and_lock");
static int __used atomic_dec_and_lock_1(atomic_t *atomic, spinlock_t *lock)
{
/* Slow path */
spin_lock(lock);
if (atomic_dec_and_test(atomic))
return 1;
spin_unlock(lock);
return 0;
}