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 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