Release 4.14 arch/sh/include/asm/atomic-irq.h

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

#define __ASM_SH_ATOMIC_IRQ_H

#include <linux/irqflags.h>

/*
 * To get proper branch prediction for the main line, we must branch
 * forward to code at the end of this object's .text section, then
 * branch back to restart the operation.
 */


#define ATOMIC_OP(op, c_op)						\
static inline void atomic_##op(int i, atomic_t *v)                      \
{                                                                       \
        unsigned long flags;                                            \
                                                                        \
        raw_local_irq_save(flags);                                      \
        v->counter c_op i;                                              \
        raw_local_irq_restore(flags);                                   \
}


#define ATOMIC_OP_RETURN(op, c_op)					\
static inline int atomic_##op##_return(int i, atomic_t *v)              \
{                                                                       \
        unsigned long temp, flags;                                      \
                                                                        \
        raw_local_irq_save(flags);                                      \
        temp = v->counter;                                              \
        temp c_op i;                                                    \
        v->counter = temp;                                              \
        raw_local_irq_restore(flags);                                   \
                                                                        \
        return temp;                                                    \
}


#define ATOMIC_FETCH_OP(op, c_op)					\
static inline int atomic_fetch_##op(int i, atomic_t *v)                 \
{                                                                       \
        unsigned long temp, flags;                                      \
                                                                        \
        raw_local_irq_save(flags);                                      \
        temp = v->counter;                                              \
        v->counter c_op i;                                              \
        raw_local_irq_restore(flags);                                   \
                                                                        \
        return temp;                                                    \
}


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

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


#undef ATOMIC_OPS

#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, ^=)


#undef ATOMIC_OPS

#undef ATOMIC_FETCH_OP

#undef ATOMIC_OP_RETURN

#undef ATOMIC_OP

#endif /* __ASM_SH_ATOMIC_IRQ_H */
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Peter Zijlstra
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David Howells
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Directory: arch/sh/include/asm

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