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 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 = __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 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, state, format...) \
50({ \
51 int rtn = 0; \
52 if (unlikely(__ratelimit(state))) \
53 rtn = WARN(condition, format); \
54 rtn; \
55})
56
57#define WARN_RATELIMIT(condition, format...) \
58({ \
59 static DEFINE_RATELIMIT_STATE(_rs, \
60 DEFAULT_RATELIMIT_INTERVAL, \
61 DEFAULT_RATELIMIT_BURST); \
62 __WARN_RATELIMIT(condition, &_rs, format); \
63})
64
65#else
66
67#define WARN_ON_RATELIMIT(condition, state) \
68 WARN_ON(condition)
69
70#define __WARN_RATELIMIT(condition, state, format...) \
71({ \
72 int rtn = WARN(condition, format); \
73 rtn; \
74})
75
76#define WARN_RATELIMIT(condition, format...) \
77({ \
78 int rtn = WARN(condition, format); \
79 rtn; \
80})
81
82#endif
83
84#endif /* _LINUX_RATELIMIT_H */