tools/include/asm-generic/barrier.h

   1 /*
   2  * Copied from the kernel sources to tools/perf/:
   3  *
   4  * Generic barrier definitions.
   5  *
   6  * It should be possible to use these on really simple architectures,
   7  * but it serves more as a starting point for new ports.
   8  *
   9  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  10  * Written by David Howells (dhowells@redhat.com)
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public Licence
  14  * as published by the Free Software Foundation; either version
  15  * 2 of the Licence, or (at your option) any later version.
  16  */
  17 #ifndef __TOOLS_LINUX_ASM_GENERIC_BARRIER_H
  18 #define __TOOLS_LINUX_ASM_GENERIC_BARRIER_H
  19
  20 #ifndef __ASSEMBLY__
  21
  22 #include <linux/compiler.h>
  23
  24 /*
  25  * Force strict CPU ordering. And yes, this is required on UP too when we're
  26  * talking to devices.
  27  *
  28  * Fall back to compiler barriers if nothing better is provided.
  29  */
  30
  31 #ifndef mb
  32 #define mb()    barrier()
  33 #endif
  34
  35 #ifndef rmb
  36 #define rmb()   mb()
  37 #endif
  38
  39 #ifndef wmb
  40 #define wmb()   mb()
  41 #endif
  42
  43 #endif /* !__ASSEMBLY__ */
  44 #endif /* __TOOLS_LINUX_ASM_GENERIC_BARRIER_H */