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: / lib / modules / 4.4.0-1128-aws / build / arch / score / include / asm /
Filename : cmpxchg.h
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#ifndef _ASM_SCORE_CMPXCHG_H
#define _ASM_SCORE_CMPXCHG_H

#include <linux/irqflags.h>

struct __xchg_dummy { unsigned long a[100]; };
#define __xg(x) ((struct __xchg_dummy *)(x))

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

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

#define xchg(ptr, v)						\
	((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr),	\
					(unsigned long)(v)))

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

	local_irq_save(flags);
	retval = *m;
	if (retval == old)
		*m = new;
	local_irq_restore(flags);
	return retval;
}

#define cmpxchg(ptr, o, n)					\
	((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr),	\
					(unsigned long)(o),	\
					(unsigned long)(n)))

#include <asm-generic/cmpxchg-local.h>

#endif /* _ASM_SCORE_CMPXCHG_H */