1 #ifndef __ASM_SH_ATOMIC_H
2 #define __ASM_SH_ATOMIC_H
5 * Atomic operations that C can't guarantee us. Useful for
6 * resource counting etc..
10 #include <linux/compiler.h>
11 #include <linux/types.h>
12 #include <asm/cmpxchg.h>
13 #include <asm/barrier.h>
15 #define ATOMIC_INIT(i) { (i) }
17 #define atomic_read(v) READ_ONCE((v)->counter)
18 #define atomic_set(v,i) WRITE_ONCE((v)->counter, (i))
20 #if defined(CONFIG_GUSA_RB)
21 #include <asm/atomic-grb.h>
22 #elif defined(CONFIG_CPU_SH4A)
23 #include <asm/atomic-llsc.h>
25 #include <asm/atomic-irq.h>
28 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
29 #define atomic_dec_return(v) atomic_sub_return(1, (v))
30 #define atomic_inc_return(v) atomic_add_return(1, (v))
31 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
32 #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
33 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
35 #define atomic_inc(v) atomic_add(1, (v))
36 #define atomic_dec(v) atomic_sub(1, (v))
38 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
39 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
42 * __atomic_add_unless - add unless the number is a given value
43 * @v: pointer of type atomic_t
44 * @a: the amount to add to v...
45 * @u: ...unless v is equal to u.
47 * Atomically adds @a to @v, so long as it was not @u.
48 * Returns the old value of @v.
50 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
55 if (unlikely(c == (u)))
57 old = atomic_cmpxchg((v), c, c + (a));
66 #endif /* __ASM_SH_ATOMIC_H */