https://github.com/torvalds/linux
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Tip revision: 99abfeafb5f2eea1bb481330ff37343e1133c924 authored by Linus Torvalds on 25 January 2007, 02:19:28 UTC
Linux 2.6.20-rc6
Tip revision: 99abfea
atomic-irq.h
#ifndef __ASM_SH_ATOMIC_IRQ_H
#define __ASM_SH_ATOMIC_IRQ_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.
 */
static inline void atomic_add(int i, atomic_t *v)
{
	unsigned long flags;

	local_irq_save(flags);
	*(long *)v += i;
	local_irq_restore(flags);
}

static inline void atomic_sub(int i, atomic_t *v)
{
	unsigned long flags;

	local_irq_save(flags);
	*(long *)v -= i;
	local_irq_restore(flags);
}

static inline int atomic_add_return(int i, atomic_t *v)
{
	unsigned long temp, flags;

	local_irq_save(flags);
	temp = *(long *)v;
	temp += i;
	*(long *)v = temp;
	local_irq_restore(flags);

	return temp;
}

static inline int atomic_sub_return(int i, atomic_t *v)
{
	unsigned long temp, flags;

	local_irq_save(flags);
	temp = *(long *)v;
	temp -= i;
	*(long *)v = temp;
	local_irq_restore(flags);

	return temp;
}

static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
{
	unsigned long flags;

	local_irq_save(flags);
	*(long *)v &= ~mask;
	local_irq_restore(flags);
}

static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
{
	unsigned long flags;

	local_irq_save(flags);
	*(long *)v |= mask;
	local_irq_restore(flags);
}

#endif /* __ASM_SH_ATOMIC_IRQ_H */
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