76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
#ifndef _LINUX_RATELIMIT_H
|
|
#define _LINUX_RATELIMIT_H
|
|
|
|
#include <linux/param.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#define DEFAULT_RATELIMIT_INTERVAL (5 * HZ)
|
|
#define DEFAULT_RATELIMIT_BURST 10
|
|
|
|
struct ratelimit_state {
|
|
raw_spinlock_t lock; /* protect the state */
|
|
|
|
int interval;
|
|
int burst;
|
|
int printed;
|
|
int missed;
|
|
unsigned long begin;
|
|
};
|
|
|
|
#define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init) \
|
|
\
|
|
struct ratelimit_state name = { \
|
|
.lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
|
|
.interval = interval_init, \
|
|
.burst = burst_init, \
|
|
}
|
|
|
|
static inline void ratelimit_state_init(struct ratelimit_state *rs,
|
|
int interval, int burst)
|
|
{
|
|
raw_spin_lock_init(&rs->lock);
|
|
rs->interval = interval;
|
|
rs->burst = burst;
|
|
rs->printed = 0;
|
|
rs->missed = 0;
|
|
rs->begin = 0;
|
|
}
|
|
|
|
extern struct ratelimit_state printk_ratelimit_state;
|
|
|
|
extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
|
|
#define __ratelimit(state) ___ratelimit(state, __func__)
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
|
|
#define WARN_ON_RATELIMIT(condition, state) \
|
|
WARN_ON((condition) && __ratelimit(state))
|
|
|
|
#define WARN_RATELIMIT(condition, format, ...) \
|
|
({ \
|
|
static DEFINE_RATELIMIT_STATE(_rs, \
|
|
DEFAULT_RATELIMIT_INTERVAL, \
|
|
DEFAULT_RATELIMIT_BURST); \
|
|
int rtn = !!(condition); \
|
|
\
|
|
if (unlikely(rtn && __ratelimit(&_rs))) \
|
|
WARN(rtn, format, ##__VA_ARGS__); \
|
|
\
|
|
rtn; \
|
|
})
|
|
|
|
#else
|
|
|
|
#define WARN_ON_RATELIMIT(condition, state) \
|
|
WARN_ON(condition)
|
|
|
|
#define WARN_RATELIMIT(condition, format, ...) \
|
|
({ \
|
|
int rtn = WARN(condition, format, ##__VA_ARGS__); \
|
|
rtn; \
|
|
})
|
|
|
|
#endif
|
|
|
|
#endif /* _LINUX_RATELIMIT_H */
|