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kernel/linux-rt-4.4.41/arch/avr32/include/asm/barrier.h 574 Bytes
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  /*
   * Copyright (C) 2004-2006 Atmel Corporation
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #ifndef __ASM_AVR32_BARRIER_H
  #define __ASM_AVR32_BARRIER_H
  
  /*
   * Weirdest thing ever.. no full barrier, but it has a write barrier!
   */
  #define wmb()	asm volatile("sync 0" : : : "memory")
  
  #ifdef CONFIG_SMP
  # error "The AVR32 port does not support SMP"
  #endif
  
  #include <asm-generic/barrier.h>
  
  #endif /* __ASM_AVR32_BARRIER_H */