LXR linux/include/linux/jump_label

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_JUMP_LABEL_RATELIMIT_H
   3#define _LINUX_JUMP_LABEL_RATELIMIT_H
   4
   5#include <linux/jump_label.h>
   6#include <linux/workqueue.h>
   7
   8#if defined(CONFIG_JUMP_LABEL)
   9struct static_key_deferred {
  10        struct static_key key;
  11        unsigned long timeout;
  12        struct delayed_work work;
  13};
  14
  15struct static_key_true_deferred {
  16        struct static_key_true key;
  17        unsigned long timeout;
  18        struct delayed_work work;
  19};
  20
  21struct static_key_false_deferred {
  22        struct static_key_false key;
  23        unsigned long timeout;
  24        struct delayed_work work;
  25};
  26
  27#define static_key_slow_dec_deferred(x)                                 \
  28        __static_key_slow_dec_deferred(&(x)->key, &(x)->work, (x)->timeout)
  29#define static_branch_slow_dec_deferred(x)                              \
  30        __static_key_slow_dec_deferred(&(x)->key.key, &(x)->work, (x)->timeout)
  31
  32#define static_key_deferred_flush(x)                                    \
  33        __static_key_deferred_flush((x), &(x)->work)
  34
  35extern void
  36__static_key_slow_dec_deferred(struct static_key *key,
  37                               struct delayed_work *work,
  38                               unsigned long timeout);
  39extern void __static_key_deferred_flush(void *key, struct delayed_work *work);
  40extern void
  41jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
  42
  43extern void jump_label_update_timeout(struct work_struct *work);
  44
  45#define DEFINE_STATIC_KEY_DEFERRED_TRUE(name, rl)                       \
  46        struct static_key_true_deferred name = {                        \
  47                .key =          { STATIC_KEY_INIT_TRUE },               \
  48                .timeout =      (rl),                                   \
  49                .work = __DELAYED_WORK_INITIALIZER((name).work,         \
  50                                                   jump_label_update_timeout, \
  51                                                   0),                  \
  52        }
  53
  54#define DEFINE_STATIC_KEY_DEFERRED_FALSE(name, rl)                      \
  55        struct static_key_false_deferred name = {                       \
  56                .key =          { STATIC_KEY_INIT_FALSE },              \
  57                .timeout =      (rl),                                   \
  58                .work = __DELAYED_WORK_INITIALIZER((name).work,         \
  59                                                   jump_label_update_timeout, \
  60                                                   0),                  \
  61        }
  62
  63#define static_branch_deferred_inc(x)   static_branch_inc(&(x)->key)
  64
  65#else   /* !CONFIG_JUMP_LABEL */
  66struct static_key_deferred {
  67        struct static_key  key;
  68};
  69struct static_key_true_deferred {
  70        struct static_key_true key;
  71};
  72struct static_key_false_deferred {
  73        struct static_key_false key;
  74};
  75#define DEFINE_STATIC_KEY_DEFERRED_TRUE(name, rl)       \
  76        struct static_key_true_deferred name = { STATIC_KEY_TRUE_INIT }
  77#define DEFINE_STATIC_KEY_DEFERRED_FALSE(name, rl)      \
  78        struct static_key_false_deferred name = { STATIC_KEY_FALSE_INIT }
  79
  80#define static_branch_slow_dec_deferred(x)      static_branch_dec(&(x)->key)
  81
  82static inline void static_key_slow_dec_deferred(struct static_key_deferred *key)
  83{
  84        STATIC_KEY_CHECK_USE(key);
  85        static_key_slow_dec(&key->key);
  86}
  87static inline void static_key_deferred_flush(void *key)
  88{
  89        STATIC_KEY_CHECK_USE(key);
  90}
  91static inline void
  92jump_label_rate_limit(struct static_key_deferred *key,
  93                unsigned long rl)
  94{
  95        STATIC_KEY_CHECK_USE(key);
  96}
  97#endif  /* CONFIG_JUMP_LABEL */
  98#endif  /* _LINUX_JUMP_LABEL_RATELIMIT_H */
  99