1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_JUMP_LABEL_RATELIMIT_H
3 #define _LINUX_JUMP_LABEL_RATELIMIT_H
4
5 #include <linux/jump_label.h>
6 #include <linux/workqueue.h>
7
8 #if defined(CONFIG_JUMP_LABEL)
9 struct static_key_deferred {
10 struct static_key key;
11 unsigned long timeout;
12 struct delayed_work work;
13 };
14
15 struct static_key_true_deferred {
16 struct static_key_true key;
17 unsigned long timeout;
18 struct delayed_work work;
19 };
20
21 struct static_key_false_deferred {
22 struct static_key_false key;
23 unsigned long timeout;
24 struct delayed_work work;
25 };
26
27 #define static_key_slow_dec_deferred(x) \
28 __static_key_slow_dec_deferred(&(x)->key, &(x)->work, (x)->timeout)
29 #define static_branch_slow_dec_deferred(x) \
30 __static_key_slow_dec_deferred(&(x)->key.key, &(x)->work, (x)->timeout)
31
32 #define static_key_deferred_flush(x) \
33 __static_key_deferred_flush((x), &(x)->work)
34
35 extern void
36 __static_key_slow_dec_deferred(struct static_key *key,
37 struct delayed_work *work,
38 unsigned long timeout);
39 extern void __static_key_deferred_flush(void *key, struct delayed_work *work);
40 extern void
41 jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
42
43 extern void jump_label_update_timeout(struct work_struct *work);
44
45 #define DEFINE_STATIC_KEY_DEFERRED_TRUE(name, rl) \
46 struct static_key_true_deferred name = { \
47 .key = { STATIC_KEY_INIT_TRUE }, \
48 .timeout = (rl), \
49 .work = __DELAYED_WORK_INITIALIZER((name).work, \
50 jump_label_update_timeout, \
51 0), \
52 }
53
54 #define DEFINE_STATIC_KEY_DEFERRED_FALSE(name, rl) \
55 struct static_key_false_deferred name = { \
56 .key = { STATIC_KEY_INIT_FALSE }, \
57 .timeout = (rl), \
58 .work = __DELAYED_WORK_INITIALIZER((name).work, \
59 jump_label_update_timeout, \
60 0), \
61 }
62
63 #else /* !CONFIG_JUMP_LABEL */
64 struct static_key_deferred {
65 struct static_key key;
66 };
67 struct static_key_true_deferred {
68 struct static_key_true key;
69 };
70 struct static_key_false_deferred {
71 struct static_key_false key;
72 };
73 #define DEFINE_STATIC_KEY_DEFERRED_TRUE(name, rl) \
74 struct static_key_true_deferred name = { STATIC_KEY_TRUE_INIT }
75 #define DEFINE_STATIC_KEY_DEFERRED_FALSE(name, rl) \
76 struct static_key_false_deferred name = { STATIC_KEY_FALSE_INIT }
77
78 #define static_branch_slow_dec_deferred(x) static_branch_dec(&(x)->key)
79
80 static inline void static_key_slow_dec_deferred(struct static_key_deferred *key)
81 {
82 STATIC_KEY_CHECK_USE(key);
83 static_key_slow_dec(&key->key);
84 }
85 static inline void static_key_deferred_flush(void *key)
86 {
87 STATIC_KEY_CHECK_USE(key);
88 }
89 static inline void
90 jump_label_rate_limit(struct static_key_deferred *key,
91 unsigned long rl)
92 {
93 STATIC_KEY_CHECK_USE(key);
94 }
95 #endif /* CONFIG_JUMP_LABEL */
96
97 #define static_branch_deferred_inc(x) static_branch_inc(&(x)->key)
98
99 #endif /* _LINUX_JUMP_LABEL_RATELIMIT_H */
100
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