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)
9struct static_key_deferred {
10 struct static_key key;
11 unsigned long timeout;
12 struct delayed_work work;
13};
14
15struct static_key_true_deferred {
16 struct static_key_true key;
17 unsigned long timeout;
18 struct delayed_work work;
19};
20
21struct 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
35extern void
36__static_key_slow_dec_deferred(struct static_key *key,
37 struct delayed_work *work,
38 unsigned long timeout);
39extern void __static_key_deferred_flush(void *key, struct delayed_work *work);
40extern void
41jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
42
43extern 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 */
64struct static_key_deferred {
65 struct static_key key;
66};
67struct static_key_true_deferred {
68 struct static_key_true key;
69};
70struct 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
80static 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}
85static inline void static_key_deferred_flush(void *key)
86{
87 STATIC_KEY_CHECK_USE(key);
88}
89static inline void
90jump_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