[PATCH] USB: Fix warning in drivers/usb/media/ov511.c
[linux-2.6.git] / include / asm-ia64 / atomic.h
1 #ifndef _ASM_IA64_ATOMIC_H
2 #define _ASM_IA64_ATOMIC_H
3
4 /*
5  * Atomic operations that C can't guarantee us.  Useful for
6  * resource counting etc..
7  *
8  * NOTE: don't mess with the types below!  The "unsigned long" and
9  * "int" types were carefully placed so as to ensure proper operation
10  * of the macros.
11  *
12  * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co
13  *      David Mosberger-Tang <davidm@hpl.hp.com>
14  */
15 #include <linux/types.h>
16
17 #include <asm/intrinsics.h>
18
19 /*
20  * On IA-64, counter must always be volatile to ensure that that the
21  * memory accesses are ordered.
22  */
23 typedef struct { volatile __s32 counter; } atomic_t;
24 typedef struct { volatile __s64 counter; } atomic64_t;
25
26 #define ATOMIC_INIT(i)          ((atomic_t) { (i) })
27 #define ATOMIC64_INIT(i)        ((atomic64_t) { (i) })
28
29 #define atomic_read(v)          ((v)->counter)
30 #define atomic64_read(v)        ((v)->counter)
31
32 #define atomic_set(v,i)         (((v)->counter) = (i))
33 #define atomic64_set(v,i)       (((v)->counter) = (i))
34
35 static __inline__ int
36 ia64_atomic_add (int i, atomic_t *v)
37 {
38         __s32 old, new;
39         CMPXCHG_BUGCHECK_DECL
40
41         do {
42                 CMPXCHG_BUGCHECK(v);
43                 old = atomic_read(v);
44                 new = old + i;
45         } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
46         return new;
47 }
48
49 static __inline__ int
50 ia64_atomic64_add (__s64 i, atomic64_t *v)
51 {
52         __s64 old, new;
53         CMPXCHG_BUGCHECK_DECL
54
55         do {
56                 CMPXCHG_BUGCHECK(v);
57                 old = atomic_read(v);
58                 new = old + i;
59         } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
60         return new;
61 }
62
63 static __inline__ int
64 ia64_atomic_sub (int i, atomic_t *v)
65 {
66         __s32 old, new;
67         CMPXCHG_BUGCHECK_DECL
68
69         do {
70                 CMPXCHG_BUGCHECK(v);
71                 old = atomic_read(v);
72                 new = old - i;
73         } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
74         return new;
75 }
76
77 static __inline__ int
78 ia64_atomic64_sub (__s64 i, atomic64_t *v)
79 {
80         __s64 old, new;
81         CMPXCHG_BUGCHECK_DECL
82
83         do {
84                 CMPXCHG_BUGCHECK(v);
85                 old = atomic_read(v);
86                 new = old - i;
87         } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
88         return new;
89 }
90
91 #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
92 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
93
94 #define atomic_add_unless(v, a, u)                              \
95 ({                                                              \
96         int c, old;                                             \
97         c = atomic_read(v);                                     \
98         while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
99                 c = old;                                        \
100         c != (u);                                               \
101 })
102 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
103
104 #define atomic_add_return(i,v)                                          \
105 ({                                                                      \
106         int __ia64_aar_i = (i);                                         \
107         (__builtin_constant_p(i)                                        \
108          && (   (__ia64_aar_i ==  1) || (__ia64_aar_i ==   4)           \
109              || (__ia64_aar_i ==  8) || (__ia64_aar_i ==  16)           \
110              || (__ia64_aar_i == -1) || (__ia64_aar_i ==  -4)           \
111              || (__ia64_aar_i == -8) || (__ia64_aar_i == -16)))         \
112                 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter)       \
113                 : ia64_atomic_add(__ia64_aar_i, v);                     \
114 })
115
116 #define atomic64_add_return(i,v)                                        \
117 ({                                                                      \
118         long __ia64_aar_i = (i);                                        \
119         (__builtin_constant_p(i)                                        \
120          && (   (__ia64_aar_i ==  1) || (__ia64_aar_i ==   4)           \
121              || (__ia64_aar_i ==  8) || (__ia64_aar_i ==  16)           \
122              || (__ia64_aar_i == -1) || (__ia64_aar_i ==  -4)           \
123              || (__ia64_aar_i == -8) || (__ia64_aar_i == -16)))         \
124                 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter)       \
125                 : ia64_atomic64_add(__ia64_aar_i, v);                   \
126 })
127
128 /*
129  * Atomically add I to V and return TRUE if the resulting value is
130  * negative.
131  */
132 static __inline__ int
133 atomic_add_negative (int i, atomic_t *v)
134 {
135         return atomic_add_return(i, v) < 0;
136 }
137
138 static __inline__ int
139 atomic64_add_negative (__s64 i, atomic64_t *v)
140 {
141         return atomic64_add_return(i, v) < 0;
142 }
143
144 #define atomic_sub_return(i,v)                                          \
145 ({                                                                      \
146         int __ia64_asr_i = (i);                                         \
147         (__builtin_constant_p(i)                                        \
148          && (   (__ia64_asr_i ==   1) || (__ia64_asr_i ==   4)          \
149              || (__ia64_asr_i ==   8) || (__ia64_asr_i ==  16)          \
150              || (__ia64_asr_i ==  -1) || (__ia64_asr_i ==  -4)          \
151              || (__ia64_asr_i ==  -8) || (__ia64_asr_i == -16)))        \
152                 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter)      \
153                 : ia64_atomic_sub(__ia64_asr_i, v);                     \
154 })
155
156 #define atomic64_sub_return(i,v)                                        \
157 ({                                                                      \
158         long __ia64_asr_i = (i);                                        \
159         (__builtin_constant_p(i)                                        \
160          && (   (__ia64_asr_i ==   1) || (__ia64_asr_i ==   4)          \
161              || (__ia64_asr_i ==   8) || (__ia64_asr_i ==  16)          \
162              || (__ia64_asr_i ==  -1) || (__ia64_asr_i ==  -4)          \
163              || (__ia64_asr_i ==  -8) || (__ia64_asr_i == -16)))        \
164                 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter)      \
165                 : ia64_atomic64_sub(__ia64_asr_i, v);                   \
166 })
167
168 #define atomic_dec_return(v)            atomic_sub_return(1, (v))
169 #define atomic_inc_return(v)            atomic_add_return(1, (v))
170 #define atomic64_dec_return(v)          atomic64_sub_return(1, (v))
171 #define atomic64_inc_return(v)          atomic64_add_return(1, (v))
172
173 #define atomic_sub_and_test(i,v)        (atomic_sub_return((i), (v)) == 0)
174 #define atomic_dec_and_test(v)          (atomic_sub_return(1, (v)) == 0)
175 #define atomic_inc_and_test(v)          (atomic_add_return(1, (v)) == 0)
176 #define atomic64_sub_and_test(i,v)      (atomic64_sub_return((i), (v)) == 0)
177 #define atomic64_dec_and_test(v)        (atomic64_sub_return(1, (v)) == 0)
178 #define atomic64_inc_and_test(v)        (atomic64_add_return(1, (v)) == 0)
179
180 #define atomic_add(i,v)                 atomic_add_return((i), (v))
181 #define atomic_sub(i,v)                 atomic_sub_return((i), (v))
182 #define atomic_inc(v)                   atomic_add(1, (v))
183 #define atomic_dec(v)                   atomic_sub(1, (v))
184
185 #define atomic64_add(i,v)               atomic64_add_return((i), (v))
186 #define atomic64_sub(i,v)               atomic64_sub_return((i), (v))
187 #define atomic64_inc(v)                 atomic64_add(1, (v))
188 #define atomic64_dec(v)                 atomic64_sub(1, (v))
189
190 /* Atomic operations are already serializing */
191 #define smp_mb__before_atomic_dec()     barrier()
192 #define smp_mb__after_atomic_dec()      barrier()
193 #define smp_mb__before_atomic_inc()     barrier()
194 #define smp_mb__after_atomic_inc()      barrier()
195
196 #include <asm-generic/atomic.h>
197 #endif /* _ASM_IA64_ATOMIC_H */