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Filename/usr/src/linux-headers-3.13.0-24/arch/sh/include/asm/cmpxchg-irq.h
Size825
Permissionrw-r--r--
Ownerroot : root
Create time27-Apr-2025 09:50
Last modified20-Jan-2014 10:40
Last accessed06-Jul-2025 21:59
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#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_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 */