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#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 {
    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        = __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)
{
    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, state, format...)        \
({                                \
    int rtn = 0;                        \
    if (unlikely(__ratelimit(state)))            \
        rtn = WARN(condition, format);            \
    rtn;                            \
})

#define WARN_RATELIMIT(condition, format...)            \
({                                \
    static DEFINE_RATELIMIT_STATE(_rs,            \
                      DEFAULT_RATELIMIT_INTERVAL,    \
                      DEFAULT_RATELIMIT_BURST);    \
    __WARN_RATELIMIT(condition, &_rs, format);        \
})

#else

#define WARN_ON_RATELIMIT(condition, state)            \
    WARN_ON(condition)

#define __WARN_RATELIMIT(condition, state, format...)        \
({                                \
    int rtn = WARN(condition, format);            \
    rtn;                            \
})

#define WARN_RATELIMIT(condition, format...)            \
({                                \
    int rtn = WARN(condition, format);            \
    rtn;                            \
})

#endif

#endif /* _LINUX_RATELIMIT_H */

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