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Diffstat (limited to 'arch/arc/include/asm/barrier.h')
| -rw-r--r-- | arch/arc/include/asm/barrier.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/arc/include/asm/barrier.h b/arch/arc/include/asm/barrier.h new file mode 100644 index 000000000000..f6cb7c4ffb35 --- /dev/null +++ b/arch/arc/include/asm/barrier.h @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * 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_BARRIER_H +#define __ASM_BARRIER_H + +#ifndef __ASSEMBLY__ + +/* TODO-vineetg: Need to see what this does, don't we need sync anywhere */ +#define mb() __asm__ __volatile__ ("" : : : "memory") +#define rmb() mb() +#define wmb() mb() +#define set_mb(var, value) do { var = value; mb(); } while (0) +#define set_wmb(var, value) do { var = value; wmb(); } while (0) +#define read_barrier_depends() mb() + +/* TODO-vineetg verify the correctness of macros here */ +#ifdef CONFIG_SMP +#define smp_mb() mb() +#define smp_rmb() rmb() +#define smp_wmb() wmb() +#else +#define smp_mb() barrier() +#define smp_rmb() barrier() +#define smp_wmb() barrier() +#endif + +#define smp_mb__before_atomic_dec() barrier() +#define smp_mb__after_atomic_dec() barrier() +#define smp_mb__before_atomic_inc() barrier() +#define smp_mb__after_atomic_inc() barrier() + +#define smp_read_barrier_depends() do { } while (0) + +#endif + +#endif |