文件操作 - cmpxchg-irq.h

文件: /usr/src/linux-headers-5.15.0-113/arch/sh/include/asm/cmpxchg-irq.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_SH_CMPXCHG_IRQ_H
#define __ASM_SH_CMPXCHG_IRQ_H

#include <linux/irqflags.h>

static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
{
	unsigned long flags, retval;

local_irq_save(flags);
	retval = *m;
	*m = val;
	local_irq_restore(flags);
	return retval;
}

static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val)
{
	unsigned long flags, retval;

local_irq_save(flags);
	retval = *m;
	*m = val;
	local_irq_restore(flags);
	return retval;
}

static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
{
	unsigned long flags, retval;

local_irq_save(flags);
	retval = *m;
	*m = val & 0xff;
	local_irq_restore(flags);
	return retval;
}

static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
	unsigned long new)
{
	__u32 retval;
	unsigned long flags;

local_irq_save(flags);
	retval = *m;
	if (retval == old)
		*m = new;
	local_irq_restore(flags);       /* implies memory barrier  */
	return retval;
}

#endif /* __ASM_SH_CMPXCHG_IRQ_H */