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kernel/linux-rt-4.4.41/arch/x86/include/asm/cmpxchg_64.h 486 Bytes
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  #ifndef _ASM_X86_CMPXCHG_64_H
  #define _ASM_X86_CMPXCHG_64_H
  
  static inline void set_64bit(volatile u64 *ptr, u64 val)
  {
  	*ptr = val;
  }
  
  #define cmpxchg64(ptr, o, n)						\
  ({									\
  	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\
  	cmpxchg((ptr), (o), (n));					\
  })
  
  #define cmpxchg64_local(ptr, o, n)					\
  ({									\
  	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\
  	cmpxchg_local((ptr), (o), (n));					\
  })
  
  #define system_has_cmpxchg_double() cpu_has_cx16
  
  #endif /* _ASM_X86_CMPXCHG_64_H */