Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _LINUX_RATELIMIT_H
2#define _LINUX_RATELIMIT_H
3
4#include <linux/param.h>
5#include <linux/spinlock.h>
6
7#define DEFAULT_RATELIMIT_INTERVAL (5 * HZ)
8#define DEFAULT_RATELIMIT_BURST 10
9
10struct ratelimit_state {
11 raw_spinlock_t lock; /* protect the state */
12
13 int interval;
14 int burst;
15 int printed;
16 int missed;
17 unsigned long begin;
18};
19
20#define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \
21 \
22 struct ratelimit_state name = { \
23 .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
24 .interval = interval_init, \
25 .burst = burst_init, \
26 }
27
28static inline void ratelimit_state_init(struct ratelimit_state *rs,
29 int interval, int burst)
30{
31 raw_spin_lock_init(&rs->lock);
32 rs->interval = interval;
33 rs->burst = burst;
34 rs->printed = 0;
35 rs->missed = 0;
36 rs->begin = 0;
37}
38
39extern struct ratelimit_state printk_ratelimit_state;
40
41extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
42#define __ratelimit(state) ___ratelimit(state, __func__)
43
44#ifdef CONFIG_PRINTK
45
46#define WARN_ON_RATELIMIT(condition, state) \
47 WARN_ON((condition) && __ratelimit(state))
48
49#define WARN_RATELIMIT(condition, format, ...) \
50({ \
51 static DEFINE_RATELIMIT_STATE(_rs, \
52 DEFAULT_RATELIMIT_INTERVAL, \
53 DEFAULT_RATELIMIT_BURST); \
54 int rtn = !!(condition); \
55 \
56 if (unlikely(rtn && __ratelimit(&_rs))) \
57 WARN(rtn, format, ##__VA_ARGS__); \
58 \
59 rtn; \
60})
61
62#else
63
64#define WARN_ON_RATELIMIT(condition, state) \
65 WARN_ON(condition)
66
67#define WARN_RATELIMIT(condition, format, ...) \
68({ \
69 int rtn = WARN(condition, format, ##__VA_ARGS__); \
70 rtn; \
71})
72
73#endif
74
75#endif /* _LINUX_RATELIMIT_H */