Eric Lee / linux-smarc-t335x-v3.2

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include/linux/jump_label_ref.h 878 Bytes
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8b92538d8   Peter Zijlstra   jump_label: Add a... 
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  #ifndef _LINUX_JUMP_LABEL_REF_H
  #define _LINUX_JUMP_LABEL_REF_H
  
  #include <linux/jump_label.h>
  #include <asm/atomic.h>
  
  #ifdef HAVE_JUMP_LABEL
  
  static inline void jump_label_inc(atomic_t *key)
  {
  	if (atomic_add_return(1, key) == 1)
  		jump_label_enable(key);
  }
  
  static inline void jump_label_dec(atomic_t *key)
  {
  	if (atomic_dec_and_test(key))
  		jump_label_disable(key);
  }
  
  #else /* !HAVE_JUMP_LABEL */
  
  static inline void jump_label_inc(atomic_t *key)
  {
  	atomic_inc(key);
  }
  
  static inline void jump_label_dec(atomic_t *key)
  {
  	atomic_dec(key);
  }
  
  #undef JUMP_LABEL
  #define JUMP_LABEL(key, label)						\
  do {									\
  	if (unlikely(__builtin_choose_expr(				\
  	      __builtin_types_compatible_p(typeof(key), atomic_t *),	\
  	      atomic_read((atomic_t *)(key)), *(key))))			\
  		goto label;						\
  } while (0)
  
  #endif /* HAVE_JUMP_LABEL */
  
  #endif /* _LINUX_JUMP_LABEL_REF_H */