include/linux/jump_label_ref.h

   1 #ifndef _LINUX_JUMP_LABEL_REF_H
   2 #define _LINUX_JUMP_LABEL_REF_H
   3
   4 #include <linux/jump_label.h>
   5 #include <asm/atomic.h>
   6
   7 #ifdef HAVE_JUMP_LABEL
   8
   9 static inline void jump_label_inc(atomic_t *key)
  10 {
  11         if (atomic_add_return(1, key) == 1)
  12                 jump_label_enable(key);
  13 }
  14
  15 static inline void jump_label_dec(atomic_t *key)
  16 {
  17         if (atomic_dec_and_test(key))
  18                 jump_label_disable(key);
  19 }
  20
  21 #else /* !HAVE_JUMP_LABEL */
  22
  23 static inline void jump_label_inc(atomic_t *key)
  24 {
  25         atomic_inc(key);
  26 }
  27
  28 static inline void jump_label_dec(atomic_t *key)
  29 {
  30         atomic_dec(key);
  31 }
  32
  33 #undef JUMP_LABEL
  34 #define JUMP_LABEL(key, label)                                          \
  35 do {                                                                    \
  36         if (unlikely(__builtin_choose_expr(                             \
  37               __builtin_types_compatible_p(typeof(key), atomic_t *),    \
  38               atomic_read((atomic_t *)(key)), *(key))))                 \
  39                 goto label;                                             \
  40 } while (0)
  41
  42 #endif /* HAVE_JUMP_LABEL */
  43
  44 #endif /* _LINUX_JUMP_LABEL_REF_H */