1 /* See include/linux/lglock.h for description */
2 #include <linux/module.h>
3 #include <linux/lglock.h>
5 #include <linux/string.h>
8 * Note there is no uninit, so lglocks cannot be defined in
9 * modules (but it's fine to use them from there)
10 * Could be added though, just undo lg_lock_init
13 void lg_lock_init(struct lglock
*lg
, char *name
)
15 LOCKDEP_INIT_MAP(&lg
->lock_dep_map
, name
, &lg
->lock_key
, 0);
17 EXPORT_SYMBOL(lg_lock_init
);
19 void lg_local_lock(struct lglock
*lg
)
21 arch_spinlock_t
*lock
;
24 lock_acquire_shared(&lg
->lock_dep_map
, 0, 0, NULL
, _RET_IP_
);
25 lock
= this_cpu_ptr(lg
->lock
);
28 EXPORT_SYMBOL(lg_local_lock
);
30 void lg_local_unlock(struct lglock
*lg
)
32 arch_spinlock_t
*lock
;
34 lock_release(&lg
->lock_dep_map
, 1, _RET_IP_
);
35 lock
= this_cpu_ptr(lg
->lock
);
36 arch_spin_unlock(lock
);
39 EXPORT_SYMBOL(lg_local_unlock
);
41 void lg_local_lock_cpu(struct lglock
*lg
, int cpu
)
43 arch_spinlock_t
*lock
;
46 lock_acquire_shared(&lg
->lock_dep_map
, 0, 0, NULL
, _RET_IP_
);
47 lock
= per_cpu_ptr(lg
->lock
, cpu
);
50 EXPORT_SYMBOL(lg_local_lock_cpu
);
52 void lg_local_unlock_cpu(struct lglock
*lg
, int cpu
)
54 arch_spinlock_t
*lock
;
56 lock_release(&lg
->lock_dep_map
, 1, _RET_IP_
);
57 lock
= per_cpu_ptr(lg
->lock
, cpu
);
58 arch_spin_unlock(lock
);
61 EXPORT_SYMBOL(lg_local_unlock_cpu
);
63 void lg_double_lock(struct lglock
*lg
, int cpu1
, int cpu2
)
67 /* lock in cpu order, just like lg_global_lock */
72 lock_acquire_shared(&lg
->lock_dep_map
, 0, 0, NULL
, _RET_IP_
);
73 arch_spin_lock(per_cpu_ptr(lg
->lock
, cpu1
));
74 arch_spin_lock(per_cpu_ptr(lg
->lock
, cpu2
));
77 void lg_double_unlock(struct lglock
*lg
, int cpu1
, int cpu2
)
79 lock_release(&lg
->lock_dep_map
, 1, _RET_IP_
);
80 arch_spin_unlock(per_cpu_ptr(lg
->lock
, cpu1
));
81 arch_spin_unlock(per_cpu_ptr(lg
->lock
, cpu2
));
85 void lg_global_lock(struct lglock
*lg
)
90 lock_acquire_exclusive(&lg
->lock_dep_map
, 0, 0, NULL
, _RET_IP_
);
91 for_each_possible_cpu(i
) {
92 arch_spinlock_t
*lock
;
93 lock
= per_cpu_ptr(lg
->lock
, i
);
97 EXPORT_SYMBOL(lg_global_lock
);
99 void lg_global_unlock(struct lglock
*lg
)
103 lock_release(&lg
->lock_dep_map
, 1, _RET_IP_
);
104 for_each_possible_cpu(i
) {
105 arch_spinlock_t
*lock
;
106 lock
= per_cpu_ptr(lg
->lock
, i
);
107 arch_spin_unlock(lock
);
111 EXPORT_SYMBOL(lg_global_unlock
);