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07354eb1a7
The logbuf_lock lock can be taken in atomic context and therefore cannot be preempted on -rt - annotate it. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> [ merged and fixed it ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
#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/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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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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};
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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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.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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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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raw_spin_lock_init(&rs->lock);
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rs->interval = interval;
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rs->burst = burst;
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rs->printed = 0;
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rs->missed = 0;
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rs->begin = 0;
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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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WARN_ON((condition) && __ratelimit(state))
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#define __WARN_RATELIMIT(condition, state, format...) \
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({ \
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int rtn = 0; \
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if (unlikely(__ratelimit(state))) \
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rtn = WARN(condition, format); \
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rtn; \
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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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__WARN_RATELIMIT(condition, &_rs, format); \
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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, state, format...) \
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({ \
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int rtn = WARN(condition, format); \
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rtn; \
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})
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#define WARN_RATELIMIT(condition, format...) \
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({ \
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int rtn = WARN(condition, format); \
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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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