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_FETCH_OP(op, c_op) \
32 static inline int atomic_fetch_##op(int i, atomic_t *v) \
37 flags = arch_local_irq_save(); \
40 arch_local_irq_restore(flags); \
44 #define ATOMIC_OP(op, c_op) \
45 static inline void atomic_##op(int i, atomic_t *v) \
49 flags = arch_local_irq_save(); \
51 arch_local_irq_restore(flags); \
54 ATOMIC_OP_RETURN(add, +=)
55 ATOMIC_OP_RETURN(sub, -=)
57 #define ATOMIC_OPS(op, c_op) \
59 ATOMIC_FETCH_OP(op, c_op)
68 #undef ATOMIC_OP_RETURN
71 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
72 #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0)
74 #define atomic_inc_return(v) atomic_add_return(1, v)
75 #define atomic_dec_return(v) atomic_sub_return(1, v)
77 #define atomic_inc(v) (void)atomic_inc_return(v)
78 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
80 #define atomic_dec(v) (void)atomic_dec_return(v)
81 #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0)
83 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
88 flags = arch_local_irq_save();
90 if (likely(ret == old))
92 arch_local_irq_restore(flags);
96 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
101 flags = arch_local_irq_save();
105 arch_local_irq_restore(flags);
109 #endif /* __ARCH_H8300_ATOMIC __ */