arch/arc/include/asm/barrier.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef __ASM_BARRIER_H
  10 #define __ASM_BARRIER_H
  11
  12 #ifndef __ASSEMBLY__
  13
  14 /* TODO-vineetg: Need to see what this does, don't we need sync anywhere */
  15 #define mb() __asm__ __volatile__ ("" : : : "memory")
  16 #define rmb() mb()
  17 #define wmb() mb()
  18 #define set_mb(var, value)  do { var = value; mb(); } while (0)
  19 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
  20 #define read_barrier_depends()  mb()
  21
  22 /* TODO-vineetg verify the correctness of macros here */
  23 #ifdef CONFIG_SMP
  24 #define smp_mb()        mb()
  25 #define smp_rmb()       rmb()
  26 #define smp_wmb()       wmb()
  27 #else
  28 #define smp_mb()        barrier()
  29 #define smp_rmb()       barrier()
  30 #define smp_wmb()       barrier()
  31 #endif
  32
  33 #define smp_mb__before_atomic_dec()     barrier()
  34 #define smp_mb__after_atomic_dec()      barrier()
  35 #define smp_mb__before_atomic_inc()     barrier()
  36 #define smp_mb__after_atomic_inc()      barrier()
  37
  38 #define smp_read_barrier_depends()      do { } while (0)
  39
  40 #endif
  41
  42 #endif