include/linux/ratelimit_types.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_RATELIMIT_TYPES_H
   3 #define _LINUX_RATELIMIT_TYPES_H
   4
   5 #include <linux/bits.h>
   6 #include <linux/param.h>
   7 #include <linux/spinlock_types.h>
   8
   9 #define DEFAULT_RATELIMIT_INTERVAL      (5 * HZ)
  10 #define DEFAULT_RATELIMIT_BURST         10
  11
  12 /* issue num suppressed message on exit */
  13 #define RATELIMIT_MSG_ON_RELEASE        BIT(0)
  14
  15 struct ratelimit_state {
  16         raw_spinlock_t  lock;           /* protect the state */
  17
  18         int             interval;
  19         int             burst;
  20         int             printed;
  21         int             missed;
  22         unsigned long   begin;
  23         unsigned long   flags;
  24 };
  25
  26 #define RATELIMIT_STATE_INIT(name, interval_init, burst_init) {         \
  27                 .lock           = __RAW_SPIN_LOCK_UNLOCKED(name.lock),  \
  28                 .interval       = interval_init,                        \
  29                 .burst          = burst_init,                           \
  30         }
  31
  32 #define RATELIMIT_STATE_INIT_DISABLED                                   \
  33         RATELIMIT_STATE_INIT(ratelimit_state, 0, DEFAULT_RATELIMIT_BURST)
  34
  35 #define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init)         \
  36                                                                         \
  37         struct ratelimit_state name =                                   \
  38                 RATELIMIT_STATE_INIT(name, interval_init, burst_init)   \
  39
  40 extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
  41 #define __ratelimit(state) ___ratelimit(state, __func__)
  42
  43 #endif /* _LINUX_RATELIMIT_TYPES_H */