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
10 struct 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
ratelimit_state_init(struct ratelimit_state * rs,int interval,int burst)28 static 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
39 extern struct ratelimit_state printk_ratelimit_state;
40
41 extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
42 #define __ratelimit(state) ___ratelimit(state, __func__)
43
44 #endif /* _LINUX_RATELIMIT_H */
45