Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_RATELIMIT_H
3#define _LINUX_RATELIMIT_H
4
5#include <linux/ratelimit_types.h>
6#include <linux/sched.h>
7#include <linux/spinlock.h>
8
9static inline void ratelimit_state_init(struct ratelimit_state *rs,
10 int interval, int burst)
11{
12 memset(rs, 0, sizeof(*rs));
13
14 raw_spin_lock_init(&rs->lock);
15 rs->interval = interval;
16 rs->burst = burst;
17}
18
19static inline void ratelimit_default_init(struct ratelimit_state *rs)
20{
21 return ratelimit_state_init(rs, DEFAULT_RATELIMIT_INTERVAL,
22 DEFAULT_RATELIMIT_BURST);
23}
24
25static inline void ratelimit_state_inc_miss(struct ratelimit_state *rs)
26{
27 atomic_inc(&rs->missed);
28}
29
30static inline int ratelimit_state_get_miss(struct ratelimit_state *rs)
31{
32 return atomic_read(&rs->missed);
33}
34
35static inline int ratelimit_state_reset_miss(struct ratelimit_state *rs)
36{
37 return atomic_xchg_relaxed(&rs->missed, 0);
38}
39
40static inline void ratelimit_state_reset_interval(struct ratelimit_state *rs, int interval_init)
41{
42 unsigned long flags;
43
44 raw_spin_lock_irqsave(&rs->lock, flags);
45 rs->interval = interval_init;
46 rs->flags &= ~RATELIMIT_INITIALIZED;
47 atomic_set(&rs->rs_n_left, rs->burst);
48 ratelimit_state_reset_miss(rs);
49 raw_spin_unlock_irqrestore(&rs->lock, flags);
50}
51
52static inline void ratelimit_state_exit(struct ratelimit_state *rs)
53{
54 int m;
55
56 if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE))
57 return;
58
59 m = ratelimit_state_reset_miss(rs);
60 if (m)
61 pr_warn("%s: %d output lines suppressed due to ratelimiting\n", current->comm, m);
62}
63
64static inline void
65ratelimit_set_flags(struct ratelimit_state *rs, unsigned long flags)
66{
67 rs->flags = flags;
68}
69
70extern struct ratelimit_state printk_ratelimit_state;
71
72#ifdef CONFIG_PRINTK
73
74#define WARN_ON_RATELIMIT(condition, state) ({ \
75 bool __rtn_cond = !!(condition); \
76 WARN_ON(__rtn_cond && __ratelimit(state)); \
77 __rtn_cond; \
78})
79
80#define WARN_RATELIMIT(condition, format, ...) \
81({ \
82 static DEFINE_RATELIMIT_STATE(_rs, \
83 DEFAULT_RATELIMIT_INTERVAL, \
84 DEFAULT_RATELIMIT_BURST); \
85 int rtn = !!(condition); \
86 \
87 if (unlikely(rtn && __ratelimit(&_rs))) \
88 WARN(rtn, format, ##__VA_ARGS__); \
89 \
90 rtn; \
91})
92
93#else
94
95#define WARN_ON_RATELIMIT(condition, state) \
96 WARN_ON(condition)
97
98#define WARN_RATELIMIT(condition, format, ...) \
99({ \
100 int rtn = WARN(condition, format, ##__VA_ARGS__); \
101 rtn; \
102})
103
104#endif
105
106#endif /* _LINUX_RATELIMIT_H */