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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/include/asm/cmpxchg-irq.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __ASM_SH_CMPXCHG_IRQ_H

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#define __ASM_SH_CMPXCHG_IRQ_H

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#include <linux/irqflags.h>

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static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)

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{

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	unsigned long flags, retval;

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	local_irq_save(flags);

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	retval = *m;

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	*m = val;

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	local_irq_restore(flags);

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	return retval;

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}

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static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val)

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{

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	unsigned long flags, retval;

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	local_irq_save(flags);

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	retval = *m;

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	*m = val;

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	local_irq_restore(flags);

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	return retval;

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}

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static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)

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{

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	unsigned long flags, retval;

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	local_irq_save(flags);

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	retval = *m;

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	*m = val & 0xff;

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	local_irq_restore(flags);

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	return retval;

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}

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static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,

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	unsigned long new)

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{

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	__u32 retval;

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	unsigned long flags;

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	local_irq_save(flags);

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	retval = *m;

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	if (retval == old)

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		*m = new;

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	local_irq_restore(flags);       /* implies memory barrier  */

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	return retval;

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}

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#endif /* __ASM_SH_CMPXCHG_IRQ_H */

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