LCOV - code coverage report
Current view: top level - include/linux - ratelimit.h (source / functions) Hit Total Coverage
Test: fstests of 6.5.0-rc3-achx @ Mon Jul 31 20:08:12 PDT 2023 Lines: 6 7 85.7 %
Date: 2023-07-31 20:08:12 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : #ifndef _LINUX_RATELIMIT_H
       3             : #define _LINUX_RATELIMIT_H
       4             : 
       5             : #include <linux/ratelimit_types.h>
       6             : #include <linux/sched.h>
       7             : #include <linux/spinlock.h>
       8             : 
       9      150787 : static inline void ratelimit_state_init(struct ratelimit_state *rs,
      10             :                                         int interval, int burst)
      11             : {
      12      150787 :         memset(rs, 0, sizeof(*rs));
      13             : 
      14      150787 :         raw_spin_lock_init(&rs->lock);
      15      150786 :         rs->interval = interval;
      16      150786 :         rs->burst    = burst;
      17      150786 : }
      18             : 
      19             : static inline void ratelimit_default_init(struct ratelimit_state *rs)
      20             : {
      21             :         return ratelimit_state_init(rs, DEFAULT_RATELIMIT_INTERVAL,
      22             :                                         DEFAULT_RATELIMIT_BURST);
      23             : }
      24             : 
      25             : static inline void ratelimit_state_exit(struct ratelimit_state *rs)
      26             : {
      27             :         if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE))
      28             :                 return;
      29             : 
      30             :         if (rs->missed) {
      31             :                 pr_warn("%s: %d output lines suppressed due to ratelimiting\n",
      32             :                         current->comm, rs->missed);
      33             :                 rs->missed = 0;
      34             :         }
      35             : }
      36             : 
      37             : static inline void
      38             : ratelimit_set_flags(struct ratelimit_state *rs, unsigned long flags)
      39             : {
      40           0 :         rs->flags = flags;
      41             : }
      42             : 
      43             : extern struct ratelimit_state printk_ratelimit_state;
      44             : 
      45             : #ifdef CONFIG_PRINTK
      46             : 
      47             : #define WARN_ON_RATELIMIT(condition, state)     ({              \
      48             :         bool __rtn_cond = !!(condition);                        \
      49             :         WARN_ON(__rtn_cond && __ratelimit(state));              \
      50             :         __rtn_cond;                                             \
      51             : })
      52             : 
      53             : #define WARN_RATELIMIT(condition, format, ...)                  \
      54             : ({                                                              \
      55             :         static DEFINE_RATELIMIT_STATE(_rs,                      \
      56             :                                       DEFAULT_RATELIMIT_INTERVAL,       \
      57             :                                       DEFAULT_RATELIMIT_BURST); \
      58             :         int rtn = !!(condition);                                \
      59             :                                                                 \
      60             :         if (unlikely(rtn && __ratelimit(&_rs)))                     \
      61             :                 WARN(rtn, format, ##__VA_ARGS__);               \
      62             :                                                                 \
      63             :         rtn;                                                    \
      64             : })
      65             : 
      66             : #else
      67             : 
      68             : #define WARN_ON_RATELIMIT(condition, state)                     \
      69             :         WARN_ON(condition)
      70             : 
      71             : #define WARN_RATELIMIT(condition, format, ...)                  \
      72             : ({                                                              \
      73             :         int rtn = WARN(condition, format, ##__VA_ARGS__);       \
      74             :         rtn;                                                    \
      75             : })
      76             : 
      77             : #endif
      78             : 
      79             : #endif /* _LINUX_RATELIMIT_H */

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