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1 | /* See include/linux/lglock.h for description */ |
2 | #include <linux/module.h> |
3 | #include <linux/lglock.h> |
4 | #include <linux/cpu.h> |
5 | #include <linux/string.h> |
6 | |
7 | /* |
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 |
11 | */ |
12 | |
13 | void lg_lock_init(struct lglock *lg, char *name) |
14 | { |
15 | LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0); |
16 | } |
17 | EXPORT_SYMBOL(lg_lock_init); |
18 | |
19 | void lg_local_lock(struct lglock *lg) |
20 | { |
21 | arch_spinlock_t *lock; |
22 | |
23 | preempt_disable(); |
24 | rwlock_acquire_read(&lg->lock_dep_map, 0, 0, _RET_IP_); |
25 | lock = this_cpu_ptr(lg->lock); |
26 | arch_spin_lock(lock); |
27 | } |
28 | EXPORT_SYMBOL(lg_local_lock); |
29 | |
30 | void lg_local_unlock(struct lglock *lg) |
31 | { |
32 | arch_spinlock_t *lock; |
33 | |
34 | rwlock_release(&lg->lock_dep_map, 1, _RET_IP_); |
35 | lock = this_cpu_ptr(lg->lock); |
36 | arch_spin_unlock(lock); |
37 | preempt_enable(); |
38 | } |
39 | EXPORT_SYMBOL(lg_local_unlock); |
40 | |
41 | void lg_local_lock_cpu(struct lglock *lg, int cpu) |
42 | { |
43 | arch_spinlock_t *lock; |
44 | |
45 | preempt_disable(); |
46 | rwlock_acquire_read(&lg->lock_dep_map, 0, 0, _RET_IP_); |
47 | lock = per_cpu_ptr(lg->lock, cpu); |
48 | arch_spin_lock(lock); |
49 | } |
50 | EXPORT_SYMBOL(lg_local_lock_cpu); |
51 | |
52 | void lg_local_unlock_cpu(struct lglock *lg, int cpu) |
53 | { |
54 | arch_spinlock_t *lock; |
55 | |
56 | rwlock_release(&lg->lock_dep_map, 1, _RET_IP_); |
57 | lock = per_cpu_ptr(lg->lock, cpu); |
58 | arch_spin_unlock(lock); |
59 | preempt_enable(); |
60 | } |
61 | EXPORT_SYMBOL(lg_local_unlock_cpu); |
62 | |
63 | void lg_global_lock(struct lglock *lg) |
64 | { |
65 | int i; |
66 | |
67 | preempt_disable(); |
68 | rwlock_acquire(&lg->lock_dep_map, 0, 0, _RET_IP_); |
69 | for_each_possible_cpu(i) { |
70 | arch_spinlock_t *lock; |
71 | lock = per_cpu_ptr(lg->lock, i); |
72 | arch_spin_lock(lock); |
73 | } |
74 | } |
75 | EXPORT_SYMBOL(lg_global_lock); |
76 | |
77 | void lg_global_unlock(struct lglock *lg) |
78 | { |
79 | int i; |
80 | |
81 | rwlock_release(&lg->lock_dep_map, 1, _RET_IP_); |
82 | for_each_possible_cpu(i) { |
83 | arch_spinlock_t *lock; |
84 | lock = per_cpu_ptr(lg->lock, i); |
85 | arch_spin_unlock(lock); |
86 | } |
87 | preempt_enable(); |
88 | } |
89 | EXPORT_SYMBOL(lg_global_unlock); |
90 |
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