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113 lines
2.6 KiB
113 lines
2.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_RATELIMIT_H |
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#define _LINUX_RATELIMIT_H |
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#include <linux/param.h> |
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#include <linux/sched.h> |
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#include <linux/spinlock.h> |
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#define DEFAULT_RATELIMIT_INTERVAL (5 * HZ) |
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#define DEFAULT_RATELIMIT_BURST 10 |
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/* issue num suppressed message on exit */ |
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#define RATELIMIT_MSG_ON_RELEASE BIT(0) |
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struct ratelimit_state { |
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raw_spinlock_t lock; /* protect the state */ |
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int interval; |
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int burst; |
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int printed; |
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int missed; |
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unsigned long begin; |
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unsigned long flags; |
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}; |
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#define RATELIMIT_STATE_INIT(name, interval_init, burst_init) { \ |
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.lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \ |
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.interval = interval_init, \ |
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.burst = burst_init, \ |
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} |
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#define RATELIMIT_STATE_INIT_DISABLED \ |
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RATELIMIT_STATE_INIT(ratelimit_state, 0, DEFAULT_RATELIMIT_BURST) |
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#define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \ |
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\ |
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struct ratelimit_state name = \ |
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RATELIMIT_STATE_INIT(name, interval_init, burst_init) \ |
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static inline void ratelimit_state_init(struct ratelimit_state *rs, |
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int interval, int burst) |
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{ |
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memset(rs, 0, sizeof(*rs)); |
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raw_spin_lock_init(&rs->lock); |
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rs->interval = interval; |
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rs->burst = burst; |
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} |
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static inline void ratelimit_default_init(struct ratelimit_state *rs) |
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{ |
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return ratelimit_state_init(rs, DEFAULT_RATELIMIT_INTERVAL, |
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DEFAULT_RATELIMIT_BURST); |
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} |
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static inline void ratelimit_state_exit(struct ratelimit_state *rs) |
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{ |
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if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE)) |
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return; |
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if (rs->missed) { |
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pr_warn("%s: %d output lines suppressed due to ratelimiting\n", |
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current->comm, rs->missed); |
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rs->missed = 0; |
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} |
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} |
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static inline void |
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ratelimit_set_flags(struct ratelimit_state *rs, unsigned long flags) |
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{ |
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rs->flags = flags; |
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} |
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extern struct ratelimit_state printk_ratelimit_state; |
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extern int ___ratelimit(struct ratelimit_state *rs, const char *func); |
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#define __ratelimit(state) ___ratelimit(state, __func__) |
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#ifdef CONFIG_PRINTK |
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#define WARN_ON_RATELIMIT(condition, state) ({ \ |
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bool __rtn_cond = !!(condition); \ |
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WARN_ON(__rtn_cond && __ratelimit(state)); \ |
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__rtn_cond; \ |
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}) |
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#define WARN_RATELIMIT(condition, format, ...) \ |
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({ \ |
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static DEFINE_RATELIMIT_STATE(_rs, \ |
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DEFAULT_RATELIMIT_INTERVAL, \ |
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DEFAULT_RATELIMIT_BURST); \ |
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int rtn = !!(condition); \ |
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\ |
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if (unlikely(rtn && __ratelimit(&_rs))) \ |
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WARN(rtn, format, ##__VA_ARGS__); \ |
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\ |
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rtn; \ |
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}) |
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#else |
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#define WARN_ON_RATELIMIT(condition, state) \ |
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WARN_ON(condition) |
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#define WARN_RATELIMIT(condition, format, ...) \ |
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({ \ |
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int rtn = WARN(condition, format, ##__VA_ARGS__); \ |
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rtn; \ |
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}) |
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#endif |
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#endif /* _LINUX_RATELIMIT_H */
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