#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 */