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 int ___ratelimit(struct ratelimit_state *rs, const char *func); 40#define __ratelimit(state) ___ratelimit(state, __func__) 41 42#endif /* _LINUX_RATELIMIT_H */ 43