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TOMOYO Linux Cross Reference
Linux/include/linux/ratelimit.h

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  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 #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 
 84 #endif /* _LINUX_RATELIMIT_H */
 85 

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