| 1 | #ifndef _LINUX_RATELIMIT_H
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| 2 | #define _LINUX_RATELIMIT_H
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| 3 |
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| 4 | #include <linux/param.h>
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| 5 | #include <linux/spinlock.h>
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| 6 |
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| 7 | #define DEFAULT_RATELIMIT_INTERVAL (5 * HZ)
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| 8 | #define DEFAULT_RATELIMIT_BURST 10
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| 9 |
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| 10 | struct ratelimit_state {
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| 11 | raw_spinlock_t lock;
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| 12 |
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| 13 | int interval;
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| 14 | int burst;
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| 15 | int printed;
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| 16 | int missed;
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| 17 | unsigned long begin;
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| 18 | };
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| 19 |
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| 20 | #define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \
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| 21 | \
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| 22 | struct ratelimit_state name = { \
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| 23 | .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
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| 24 | .interval = interval_init, \
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| 25 | .burst = burst_init, \
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| 26 | }
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| 27 |
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| 28 | static inline void ratelimit_state_init(struct ratelimit_state *rs,
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| 29 | int interval, int burst)
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| 30 | {
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| 31 | raw_spin_lock_init(&rs->lock);
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| 32 | rs->interval = interval;
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| 33 | rs->burst = burst;
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| 34 | rs->printed = 0;
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| 35 | rs->missed = 0;
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| 36 | rs->begin = 0;
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| 37 | }
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| 38 |
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| 39 | extern struct ratelimit_state printk_ratelimit_state;
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| 40 |
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| 41 | extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
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| 42 | #define __ratelimit(state) ___ratelimit(state, __func__)
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| 43 |
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| 44 | #ifdef CONFIG_PRINTK
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| 45 |
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| 46 | #define WARN_ON_RATELIMIT(condition, state) \
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| 47 | WARN_ON((condition) && __ratelimit(state))
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| 48 |
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| 49 | #define WARN_RATELIMIT(condition, format, ...) \
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| 50 | ({ \
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| 51 | static DEFINE_RATELIMIT_STATE(_rs, \
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| 52 | DEFAULT_RATELIMIT_INTERVAL, \
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| 53 | DEFAULT_RATELIMIT_BURST); \
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| 54 | int rtn = !!(condition); \
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| 55 | \
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| 56 | if (unlikely(rtn && __ratelimit(&_rs))) \
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| 57 | WARN(rtn, format, ##__VA_ARGS__); \
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| 58 | \
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| 59 | rtn; \
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| 60 | })
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| 61 |
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| 62 | #else
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| 63 |
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| 64 | #define WARN_ON_RATELIMIT(condition, state) \
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| 65 | WARN_ON(condition)
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| 66 |
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| 67 | #define WARN_RATELIMIT(condition, format, ...) \
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| 68 | ({ \
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| 69 | int rtn = WARN(condition, format, ##__VA_ARGS__); \
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| 70 | rtn; \
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| 71 | })
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| 72 |
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| 73 | #endif
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| 74 |
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| 75 | #endif
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