kernel-ark/include/linux/ratelimit.h
Thomas Gleixner 07354eb1a7 locking, printk: Annotate logbuf_lock as raw
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>
2011-09-13 11:11:54 +02:00

85 lines
1.8 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, 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 */