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 raw_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 RATELIMIT_STATE_INIT(name, interval_init, burst_init) { \ 21 .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \ 22 .interval = interval_init, \ 23 .burst = burst_init, \ 24 } 25 26 #define RATELIMIT_STATE_INIT_DISABLED \ 27 RATELIMIT_STATE_INIT(ratelimit_state, 0, DEFAULT_RATELIMIT_BURST) 28 29 #define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \ 30 \ 31 struct ratelimit_state name = \ 32 RATELIMIT_STATE_INIT(name, interval_init, burst_init) \ 33 34 static inline void ratelimit_state_init(struct ratelimit_state *rs, 35 int interval, int burst) 36 { 37 raw_spin_lock_init(&rs->lock); 38 rs->interval = interval; 39 rs->burst = burst; 40 rs->printed = 0; 41 rs->missed = 0; 42 rs->begin = 0; 43 } 44 45 extern struct ratelimit_state printk_ratelimit_state; 46 47 extern int ___ratelimit(struct ratelimit_state *rs, const char *func); 48 #define __ratelimit(state) ___ratelimit(state, __func__) 49 50 #ifdef CONFIG_PRINTK 51 52 #define WARN_ON_RATELIMIT(condition, state) \ 53 WARN_ON((condition) && __ratelimit(state)) 54 55 #define WARN_RATELIMIT(condition, format, ...) \ 56 ({ \ 57 static DEFINE_RATELIMIT_STATE(_rs, \ 58 DEFAULT_RATELIMIT_INTERVAL, \ 59 DEFAULT_RATELIMIT_BURST); \ 60 int rtn = !!(condition); \ 61 \ 62 if (unlikely(rtn && __ratelimit(&_rs))) \ 63 WARN(rtn, format, ##__VA_ARGS__); \ 64 \ 65 rtn; \ 66 }) 67 68 #else 69 70 #define WARN_ON_RATELIMIT(condition, state) \ 71 WARN_ON(condition) 72 73 #define WARN_RATELIMIT(condition, format, ...) \ 74 ({ \ 75 int rtn = WARN(condition, format, ##__VA_ARGS__); \ 76 rtn; \ 77 }) 78 79 #endif 80 81 #endif /* _LINUX_RATELIMIT_H */ 82