1 #ifndef __ARCH_H8300_ATOMIC__
2 #define __ARCH_H8300_ATOMIC__
4 #include <linux/types.h>
5 #include <asm/cmpxchg.h>
8 * Atomic operations that C can't guarantee us. Useful for
9 * resource counting etc..
12 #define ATOMIC_INIT(i) { (i) }
14 #define atomic_read(v) READ_ONCE((v)->counter)
15 #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i))
17 #include <linux/kernel.h>
19 #define ATOMIC_OP_RETURN(op, c_op) \
20 static inline int atomic_##op##_return(int i, atomic_t *v) \
25 flags = arch_local_irq_save(); \
26 ret = v->counter c_op i; \
27 arch_local_irq_restore(flags); \
31 #define ATOMIC_OP(op, c_op) \
32 static inline void atomic_##op(int i, atomic_t *v) \
36 flags = arch_local_irq_save(); \
38 arch_local_irq_restore(flags); \
41 ATOMIC_OP_RETURN(add, +=)
42 ATOMIC_OP_RETURN(sub, -=)
48 #undef ATOMIC_OP_RETURN
51 #define atomic_add(i, v) (void)atomic_add_return(i, v)
52 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
54 #define atomic_sub(i, v) (void)atomic_sub_return(i, v)
55 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
57 #define atomic_inc_return(v) atomic_add_return(1, v)
58 #define atomic_dec_return(v) atomic_sub_return(1, v)
60 #define atomic_inc(v) (void)atomic_inc_return(v)
61 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
63 #define atomic_dec(v) (void)atomic_dec_return(v)
64 #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
66 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
71 flags = arch_local_irq_save();
73 if (likely(ret == old))
75 arch_local_irq_restore(flags);
79 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
84 flags = arch_local_irq_save();
88 arch_local_irq_restore(flags);
92 #endif /* __ARCH_H8300_ATOMIC __ */