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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/s390/include/asm/atomic.h
2 * Copyright IBM Corp. 1999, 2016
3 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
8 #ifndef __ARCH_S390_ATOMIC__
9 #define __ARCH_S390_ATOMIC__
11 #include <linux/compiler.h>
12 #include <linux/types.h>
13 #include <asm/atomic_ops.h>
14 #include <asm/barrier.h>
15 #include <asm/cmpxchg.h>
17 #define ATOMIC_INIT(i) { (i) }
19 static inline int atomic_read(const atomic_t
*v
)
25 : "=d" (c
) : "Q" (v
->counter
));
29 static inline void atomic_set(atomic_t
*v
, int i
)
33 : "=Q" (v
->counter
) : "d" (i
));
36 static inline int atomic_add_return(int i
, atomic_t
*v
)
38 return __atomic_add_barrier(i
, &v
->counter
) + i
;
41 static inline int atomic_fetch_add(int i
, atomic_t
*v
)
43 return __atomic_add_barrier(i
, &v
->counter
);
46 static inline void atomic_add(int i
, atomic_t
*v
)
48 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
49 if (__builtin_constant_p(i
) && (i
> -129) && (i
< 128)) {
50 __atomic_add_const(i
, &v
->counter
);
54 __atomic_add(i
, &v
->counter
);
57 #define atomic_add_negative(_i, _v) (atomic_add_return(_i, _v) < 0)
58 #define atomic_inc(_v) atomic_add(1, _v)
59 #define atomic_inc_return(_v) atomic_add_return(1, _v)
60 #define atomic_inc_and_test(_v) (atomic_add_return(1, _v) == 0)
61 #define atomic_sub(_i, _v) atomic_add(-(int)(_i), _v)
62 #define atomic_sub_return(_i, _v) atomic_add_return(-(int)(_i), _v)
63 #define atomic_fetch_sub(_i, _v) atomic_fetch_add(-(int)(_i), _v)
64 #define atomic_sub_and_test(_i, _v) (atomic_sub_return(_i, _v) == 0)
65 #define atomic_dec(_v) atomic_sub(1, _v)
66 #define atomic_dec_return(_v) atomic_sub_return(1, _v)
67 #define atomic_dec_and_test(_v) (atomic_sub_return(1, _v) == 0)
69 #define ATOMIC_OPS(op) \
70 static inline void atomic_##op(int i, atomic_t *v) \
72 __atomic_##op(i, &v->counter); \
74 static inline int atomic_fetch_##op(int i, atomic_t *v) \
76 return __atomic_##op##_barrier(i, &v->counter); \
85 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
87 static inline int atomic_cmpxchg(atomic_t
*v
, int old
, int new)
89 return __atomic_cmpxchg(&v
->counter
, old
, new);
92 static inline int __atomic_add_unless(atomic_t
*v
, int a
, int u
)
99 old
= atomic_cmpxchg(v
, c
, c
+ a
);
100 if (likely(old
== c
))
107 #define ATOMIC64_INIT(i) { (i) }
109 static inline long atomic64_read(const atomic64_t
*v
)
115 : "=d" (c
) : "Q" (v
->counter
));
119 static inline void atomic64_set(atomic64_t
*v
, long i
)
123 : "=Q" (v
->counter
) : "d" (i
));
126 static inline long atomic64_add_return(long i
, atomic64_t
*v
)
128 return __atomic64_add_barrier(i
, &v
->counter
) + i
;
131 static inline long atomic64_fetch_add(long i
, atomic64_t
*v
)
133 return __atomic64_add_barrier(i
, &v
->counter
);
136 static inline void atomic64_add(long i
, atomic64_t
*v
)
138 #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
139 if (__builtin_constant_p(i
) && (i
> -129) && (i
< 128)) {
140 __atomic64_add_const(i
, &v
->counter
);
144 __atomic64_add(i
, &v
->counter
);
147 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
149 static inline long atomic64_cmpxchg(atomic64_t
*v
, long old
, long new)
151 return __atomic64_cmpxchg(&v
->counter
, old
, new);
154 #define ATOMIC64_OPS(op) \
155 static inline void atomic64_##op(long i, atomic64_t *v) \
157 __atomic64_##op(i, &v->counter); \
159 static inline long atomic64_fetch_##op(long i, atomic64_t *v) \
161 return __atomic64_##op##_barrier(i, &v->counter); \
170 static inline int atomic64_add_unless(atomic64_t
*v
, long i
, long u
)
174 c
= atomic64_read(v
);
176 if (unlikely(c
== u
))
178 old
= atomic64_cmpxchg(v
, c
, c
+ i
);
179 if (likely(old
== c
))
186 static inline long atomic64_dec_if_positive(atomic64_t
*v
)
190 c
= atomic64_read(v
);
193 if (unlikely(dec
< 0))
195 old
= atomic64_cmpxchg((v
), c
, dec
);
196 if (likely(old
== c
))
203 #define atomic64_add_negative(_i, _v) (atomic64_add_return(_i, _v) < 0)
204 #define atomic64_inc(_v) atomic64_add(1, _v)
205 #define atomic64_inc_return(_v) atomic64_add_return(1, _v)
206 #define atomic64_inc_and_test(_v) (atomic64_add_return(1, _v) == 0)
207 #define atomic64_sub_return(_i, _v) atomic64_add_return(-(long)(_i), _v)
208 #define atomic64_fetch_sub(_i, _v) atomic64_fetch_add(-(long)(_i), _v)
209 #define atomic64_sub(_i, _v) atomic64_add(-(long)(_i), _v)
210 #define atomic64_sub_and_test(_i, _v) (atomic64_sub_return(_i, _v) == 0)
211 #define atomic64_dec(_v) atomic64_sub(1, _v)
212 #define atomic64_dec_return(_v) atomic64_sub_return(1, _v)
213 #define atomic64_dec_and_test(_v) (atomic64_sub_return(1, _v) == 0)
214 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
216 #endif /* __ARCH_S390_ATOMIC__ */