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Dave Young717115e2008-07-25 01:45:58 -07001#ifndef _LINUX_RATELIMIT_H
2#define _LINUX_RATELIMIT_H
Dave Young717115e2008-07-25 01:45:58 -07003
Ingo Molnar979f6932009-09-22 14:44:11 +02004#include <linux/param.h>
OGAWA Hirofumif40c3962010-05-24 14:33:11 -07005#include <linux/spinlock.h>
Ingo Molnar979f6932009-09-22 14:44:11 +02006
7#define DEFAULT_RATELIMIT_INTERVAL (5 * HZ)
8#define DEFAULT_RATELIMIT_BURST 10
Dave Young717115e2008-07-25 01:45:58 -07009
10struct ratelimit_state {
Thomas Gleixner07354eb2009-07-25 17:50:36 +020011 raw_spinlock_t lock; /* protect the state */
Ingo Molnar979f6932009-09-22 14:44:11 +020012
13 int interval;
14 int burst;
15 int printed;
16 int missed;
17 unsigned long begin;
Dave Young717115e2008-07-25 01:45:58 -070018};
19
Ingo Molnar979f6932009-09-22 14:44:11 +020020#define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \
21 \
22 struct ratelimit_state name = { \
Thomas Gleixner07354eb2009-07-25 17:50:36 +020023 .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
Ingo Molnar979f6932009-09-22 14:44:11 +020024 .interval = interval_init, \
25 .burst = burst_init, \
26 }
Dave Young717115e2008-07-25 01:45:58 -070027
OGAWA Hirofumif40c3962010-05-24 14:33:11 -070028static inline void ratelimit_state_init(struct ratelimit_state *rs,
29 int interval, int burst)
30{
Thomas Gleixner07354eb2009-07-25 17:50:36 +020031 raw_spin_lock_init(&rs->lock);
OGAWA Hirofumif40c3962010-05-24 14:33:11 -070032 rs->interval = interval;
33 rs->burst = burst;
34 rs->printed = 0;
35 rs->missed = 0;
36 rs->begin = 0;
37}
38
Namhyung Kimf5d87d82010-10-26 14:22:49 -070039extern struct ratelimit_state printk_ratelimit_state;
40
Christian Borntraeger5c828712009-10-23 14:58:11 +020041extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
42#define __ratelimit(state) ___ratelimit(state, __func__)
Ingo Molnar979f6932009-09-22 14:44:11 +020043
David S. Miller86e4ca62011-05-26 15:00:31 -040044#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
Ingo Molnar979f6932009-09-22 14:44:11 +020084#endif /* _LINUX_RATELIMIT_H */