| 1 |
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| 2 | #ifndef _LINUX_RATELIMIT_H
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| 3 | #define _LINUX_RATELIMIT_H
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| 4 |
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| 5 | #include <linux/ratelimit_types.h>
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| 6 | #include <linux/sched.h>
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| 7 | #include <linux/spinlock.h>
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| 8 |
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| 9 | static inline void ratelimit_state_init(struct ratelimit_state *rs,
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| 10 | int interval, int burst)
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| 11 | {
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| 12 | memset(rs, 0, sizeof(*rs));
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| 13 |
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| 14 | raw_spin_lock_init(&rs->lock);
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| 15 | rs->interval = interval;
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| 16 | rs->burst = burst;
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| 17 | }
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| 18 |
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| 19 | static inline void ratelimit_default_init(struct ratelimit_state *rs)
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| 20 | {
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| 21 | return ratelimit_state_init(rs, DEFAULT_RATELIMIT_INTERVAL,
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| 22 | DEFAULT_RATELIMIT_BURST);
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| 23 | }
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| 24 |
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| 25 | static inline void ratelimit_state_inc_miss(struct ratelimit_state *rs)
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| 26 | {
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| 27 | atomic_inc(&rs->missed);
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| 28 | }
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| 29 |
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| 30 | static inline int ratelimit_state_get_miss(struct ratelimit_state *rs)
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| 31 | {
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| 32 | return atomic_read(&rs->missed);
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| 33 | }
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| 34 |
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| 35 | static inline int ratelimit_state_reset_miss(struct ratelimit_state *rs)
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| 36 | {
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| 37 | return atomic_xchg_relaxed(&rs->missed, 0);
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| 38 | }
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| 39 |
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| 40 | static inline void ratelimit_state_reset_interval(struct ratelimit_state *rs, int interval_init)
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| 41 | {
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| 42 | unsigned long flags;
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| 43 |
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| 44 | raw_spin_lock_irqsave(&rs->lock, flags);
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| 45 | rs->interval = interval_init;
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| 46 | rs->flags &= ~RATELIMIT_INITIALIZED;
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| 47 | atomic_set(&rs->rs_n_left, rs->burst);
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| 48 | ratelimit_state_reset_miss(rs);
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| 49 | raw_spin_unlock_irqrestore(&rs->lock, flags);
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| 50 | }
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| 51 |
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| 52 | static inline void ratelimit_state_exit(struct ratelimit_state *rs)
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| 53 | {
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| 54 | int m;
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| 55 |
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| 56 | if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE))
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| 57 | return;
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| 58 |
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| 59 | m = ratelimit_state_reset_miss(rs);
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| 60 | if (m)
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| 61 | pr_warn("%s: %d output lines suppressed due to ratelimiting\n", current->comm, m);
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| 62 | }
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| 63 |
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| 64 | static inline void
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| 65 | ratelimit_set_flags(struct ratelimit_state *rs, unsigned long flags)
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| 66 | {
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| 67 | rs->flags = flags;
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| 68 | }
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| 69 |
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| 70 | extern struct ratelimit_state printk_ratelimit_state;
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| 71 |
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| 72 | #ifdef CONFIG_PRINTK
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| 73 |
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| 74 | #define WARN_ON_RATELIMIT(condition, state) ({ \
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| 75 | bool __rtn_cond = !!(condition); \
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| 76 | WARN_ON(__rtn_cond && __ratelimit(state)); \
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| 77 | __rtn_cond; \
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| 78 | })
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| 79 |
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| 80 | #define WARN_RATELIMIT(condition, format, ...) \
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| 81 | ({ \
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| 82 | static DEFINE_RATELIMIT_STATE(_rs, \
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| 83 | DEFAULT_RATELIMIT_INTERVAL, \
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| 84 | DEFAULT_RATELIMIT_BURST); \
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| 85 | int rtn = !!(condition); \
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| 86 | \
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| 87 | if (unlikely(rtn && __ratelimit(&_rs))) \
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| 88 | WARN(rtn, format, ##__VA_ARGS__); \
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| 89 | \
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| 90 | rtn; \
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| 91 | })
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| 92 |
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| 93 | #else
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| 94 |
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| 95 | #define WARN_ON_RATELIMIT(condition, state) \
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| 96 | WARN_ON(condition)
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| 97 |
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| 98 | #define WARN_RATELIMIT(condition, format, ...) \
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| 99 | ({ \
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| 100 | int rtn = WARN(condition, format, ##__VA_ARGS__); \
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| 101 | rtn; \
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| 102 | })
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| 103 |
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| 104 | #endif
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| 105 |
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| 106 | #endif
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