Merge remote-tracking branches 'asoc/fix/tlv320aic3x' and 'asoc/fix/wm8962' into...
[deliverable/linux.git] / include / asm-generic / barrier.h
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1/*
2 * Generic barrier definitions, originally based on MN10300 definitions.
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3 *
4 * It should be possible to use these on really simple architectures,
5 * but it serves more as a starting point for new ports.
6 *
7 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
8 * Written by David Howells (dhowells@redhat.com)
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public Licence
12 * as published by the Free Software Foundation; either version
13 * 2 of the Licence, or (at your option) any later version.
14 */
15#ifndef __ASM_GENERIC_BARRIER_H
16#define __ASM_GENERIC_BARRIER_H
17
18#ifndef __ASSEMBLY__
19
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20#include <linux/compiler.h>
21
22#ifndef nop
23#define nop() asm volatile ("nop")
24#endif
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25
26/*
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27 * Force strict CPU ordering. And yes, this is required on UP too when we're
28 * talking to devices.
885df91c 29 *
93ea02bb 30 * Fall back to compiler barriers if nothing better is provided.
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31 */
32
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33#ifndef mb
34#define mb() barrier()
35#endif
36
37#ifndef rmb
885df91c 38#define rmb() mb()
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39#endif
40
41#ifndef wmb
42#define wmb() mb()
43#endif
44
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45#ifndef dma_rmb
46#define dma_rmb() rmb()
47#endif
48
49#ifndef dma_wmb
50#define dma_wmb() wmb()
51#endif
52
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53#ifndef read_barrier_depends
54#define read_barrier_depends() do { } while (0)
55#endif
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56
57#ifdef CONFIG_SMP
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58
59#ifndef smp_mb
885df91c 60#define smp_mb() mb()
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61#endif
62
63#ifndef smp_rmb
885df91c 64#define smp_rmb() rmb()
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65#endif
66
67#ifndef smp_wmb
885df91c 68#define smp_wmb() wmb()
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69#endif
70
71#ifndef smp_read_barrier_depends
93ea02bb 72#define smp_read_barrier_depends() read_barrier_depends()
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73#endif
74
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75#else /* !CONFIG_SMP */
76
470c27e4 77#ifndef smp_mb
885df91c 78#define smp_mb() barrier()
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79#endif
80
81#ifndef smp_rmb
885df91c 82#define smp_rmb() barrier()
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83#endif
84
85#ifndef smp_wmb
885df91c 86#define smp_wmb() barrier()
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87#endif
88
89#ifndef smp_read_barrier_depends
93ea02bb 90#define smp_read_barrier_depends() do { } while (0)
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91#endif
92
0890a264 93#endif /* CONFIG_SMP */
470c27e4 94
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95#ifndef smp_store_mb
96#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); mb(); } while (0)
93ea02bb 97#endif
885df91c 98
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99#ifndef smp_mb__before_atomic
100#define smp_mb__before_atomic() smp_mb()
101#endif
102
103#ifndef smp_mb__after_atomic
104#define smp_mb__after_atomic() smp_mb()
105#endif
106
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107#define smp_store_release(p, v) \
108do { \
109 compiletime_assert_atomic_type(*p); \
110 smp_mb(); \
76695af2 111 WRITE_ONCE(*p, v); \
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112} while (0)
113
114#define smp_load_acquire(p) \
115({ \
76695af2 116 typeof(*p) ___p1 = READ_ONCE(*p); \
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117 compiletime_assert_atomic_type(*p); \
118 smp_mb(); \
119 ___p1; \
120})
121
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122#endif /* !__ASSEMBLY__ */
123#endif /* __ASM_GENERIC_BARRIER_H */
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