Release 4.14 arch/alpha/lib/dec_and_lock.c

// SPDX-License-Identifier: GPL-2.0
/*
 * arch/alpha/lib/dec_and_lock.c
 *
 * ll/sc version of atomic_dec_and_lock()
 * 
 */

#include <linux/spinlock.h>
#include <linux/atomic.h>
#include <linux/export.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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
33
84.62%
1
33.33%
Richard Henderson
5
12.82%
1
33.33%
Adrian Bunk
1
2.56%
1
33.33%
Total
39
100.00%
3
100.00%


EXPORT_SYMBOL(_atomic_dec_and_lock);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
40
71.43%
2
28.57%
Al Viro
8
14.29%
1
14.29%
Richard Henderson
5
8.93%
1
14.29%
Adrian Bunk
1
1.79%
1
14.29%
Greg Kroah-Hartman
1
1.79%
1
14.29%
Arun Sharma
1
1.79%
1
14.29%
Total
56
100.00%
7
100.00%
Directory: arch/alpha/lib

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.