Release 4.14 arch/h8300/include/asm/atomic.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ARCH_H8300_ATOMIC__

#define __ARCH_H8300_ATOMIC__

#include <linux/types.h>
#include <asm/cmpxchg.h>

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 */


#define ATOMIC_INIT(i)	{ (i) }


#define atomic_read(v)		READ_ONCE((v)->counter)

#define atomic_set(v, i)	WRITE_ONCE(((v)->counter), (i))

#include <linux/kernel.h>


#define ATOMIC_OP_RETURN(op, c_op)				\
static inline int atomic_##op##_return(int i, atomic_t *v)      \
{                                                               \
        h8300flags flags;                                       \
        int ret;                                                \
                                                                \
        flags = arch_local_irq_save();                          \
        ret = v->counter c_op i;                                \
        arch_local_irq_restore(flags);                          \
        return ret;                                             \
}


#define ATOMIC_FETCH_OP(op, c_op)				\
static inline int atomic_fetch_##op(int i, atomic_t *v)         \
{                                                               \
        h8300flags flags;                                       \
        int ret;                                                \
                                                                \
        flags = arch_local_irq_save();                          \
        ret = v->counter;                                       \
        v->counter c_op i;                                      \
        arch_local_irq_restore(flags);                          \
        return ret;                                             \
}


#define ATOMIC_OP(op, c_op)					\
static inline void atomic_##op(int i, atomic_t *v)              \
{                                                               \
        h8300flags flags;                                       \
                                                                \
        flags = arch_local_irq_save();                          \
        v->counter c_op i;                                      \
        arch_local_irq_restore(flags);                          \
}

ATOMIC_OP_RETURN(add, +=)
ATOMIC_OP_RETURN(sub, -=)


#define ATOMIC_OPS(op, c_op)					\
	ATOMIC_OP(op, c_op)                                     \
        ATOMIC_FETCH_OP(op, c_op)

ATOMIC_OPS(and, &=)
ATOMIC_OPS(or,  |=)
ATOMIC_OPS(xor, ^=)
ATOMIC_OPS(add, +=)
ATOMIC_OPS(sub, -=)


#undef ATOMIC_OPS

#undef ATOMIC_OP_RETURN

#undef ATOMIC_OP


#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)

#define atomic_sub_and_test(i, v)	(atomic_sub_return(i, v) == 0)


#define atomic_inc_return(v)		atomic_add_return(1, v)

#define atomic_dec_return(v)		atomic_sub_return(1, v)


#define atomic_inc(v)			(void)atomic_inc_return(v)

#define atomic_inc_and_test(v)		(atomic_inc_return(v) == 0)


#define atomic_dec(v)			(void)atomic_dec_return(v)

#define atomic_dec_and_test(v)		(atomic_dec_return(v) == 0)



static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
	int ret;
	h8300flags flags;

	flags = arch_local_irq_save();
	ret = v->counter;
	if (likely(ret == old))
		v->counter = new;
	arch_local_irq_restore(flags);
	return ret;
}

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static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
	int ret;
	h8300flags flags;

	flags = arch_local_irq_save();
	ret = v->counter;
	if (ret != u)
		v->counter += a;
	arch_local_irq_restore(flags);
	return ret;
}

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#endif /* __ARCH_H8300_ATOMIC __ */
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Peter Zijlstra
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Greg Kroah-Hartman
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305
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Directory: arch/h8300/include/asm

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