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authorChristoph Lameter <clameter@engr.sgi.com>2006-01-06 03:11:20 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 11:33:29 -0500
commitd3cb487149bd706aa6aeb02042332a450978dc1c (patch)
tree69051e0f9853314cf275e4e800faad950e3053c3 /include/asm-generic/atomic.h
parent070f80326a215d8e6c4fd6f175e28eb446c492bc (diff)
[PATCH] atomic_long_t & include/asm-generic/atomic.h V2
Several counters already have the need to use 64 atomic variables on 64 bit platforms (see mm_counter_t in sched.h). We have to do ugly ifdefs to fall back to 32 bit atomic on 32 bit platforms. The VM statistics patch that I am working on will also make more extensive use of atomic64. This patch introduces a new type atomic_long_t by providing definitions in asm-generic/atomic.h that works similar to the c "long" type. Its 32 bits on 32 bit platforms and 64 bits on 64 bit platforms. Also cleans up the determination of the mm_counter_t in sched.h. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-generic/atomic.h')
-rw-r--r--include/asm-generic/atomic.h116
1 files changed, 116 insertions, 0 deletions
diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
new file mode 100644
index 000000000000..e0a28b925ef0
--- /dev/null
+++ b/include/asm-generic/atomic.h
@@ -0,0 +1,116 @@
1#ifndef _ASM_GENERIC_ATOMIC_H
2#define _ASM_GENERIC_ATOMIC_H
3/*
4 * Copyright (C) 2005 Silicon Graphics, Inc.
5 * Christoph Lameter <clameter@sgi.com>
6 *
7 * Allows to provide arch independent atomic definitions without the need to
8 * edit all arch specific atomic.h files.
9 */
10
11
12/*
13 * Suppport for atomic_long_t
14 *
15 * Casts for parameters are avoided for existing atomic functions in order to
16 * avoid issues with cast-as-lval under gcc 4.x and other limitations that the
17 * macros of a platform may have.
18 */
19
20#if BITS_PER_LONG == 64
21
22typedef atomic64_t atomic_long_t;
23
24#define ATOMIC_LONG_INIT(i) ATOMIC64_INIT(i)
25
26static inline long atomic_long_read(atomic_long_t *l)
27{
28 atomic64_t *v = (atomic64_t *)l;
29
30 return (long)atomic64_read(v);
31}
32
33static inline void atomic_long_set(atomic_long_t *l, long i)
34{
35 atomic64_t *v = (atomic64_t *)l;
36
37 atomic_set(v, i);
38}
39
40static inline void atomic_long_inc(atomic_long_t *l)
41{
42 atomic64_t *v = (atomic64_t *)l;
43
44 atomic64_inc(v);
45}
46
47static inline void atomic_long_dec(atomic_long_t *l)
48{
49 atomic64_t *v = (atomic64_t *)l;
50
51 atomic64_dec(v);
52}
53
54static inline void atomic_long_add(long i, atomic_long_t *l)
55{
56 atomic64_t *v = (atomic64_t *)l;
57
58 atomic64_add(i, v);
59}
60
61static inline void atomic_long_sub(long i, atomic_long_t *l)
62{
63 atomic64_t *v = (atomic64_t *)l;
64
65 atomic64_sub(i, v);
66}
67
68#else
69
70typedef atomic_t atomic_long_t;
71
72#define ATOMIC_LONG_INIT(i) ATOMIC_INIT(i)
73static inline long atomic_long_read(atomic_long_t *l)
74{
75 atomic_t *v = (atomic_t *)l;
76
77 return (long)atomic_read(v);
78}
79
80static inline void atomic_long_set(atomic_long_t *l, long i)
81{
82 atomic_t *v = (atomic_t *)l;
83
84 atomic_set(v, i);
85}
86
87static inline void atomic_long_inc(atomic_long_t *l)
88{
89 atomic_t *v = (atomic_t *)l;
90
91 atomic_inc(v);
92}
93
94static inline void atomic_long_dec(atomic_long_t *l)
95{
96 atomic_t *v = (atomic_t *)l;
97
98 atomic_dec(v);
99}
100
101static inline void atomic_long_add(long i, atomic_long_t *l)
102{
103 atomic_t *v = (atomic_t *)l;
104
105 atomic_add(i, v);
106}
107
108static inline void atomic_long_sub(long i, atomic_long_t *l)
109{
110 atomic_t *v = (atomic_t *)l;
111
112 atomic_sub(i, v);
113}
114
115#endif
116#endif