49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_SCORE_CMPXCHG_H
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#define _ASM_SCORE_CMPXCHG_H
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#include <linux/irqflags.h>
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struct __xchg_dummy { unsigned long a[100]; };
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#define __xg(x) ((struct __xchg_dummy *)(x))
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static inline
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unsigned long __xchg(volatile unsigned long *m, unsigned long val)
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{
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unsigned long 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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*m = val;
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local_irq_restore(flags);
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return retval;
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}
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#define xchg(ptr, v) \
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((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr), \
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(unsigned long)(v)))
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static inline unsigned long __cmpxchg(volatile unsigned long *m,
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unsigned long old, unsigned long new)
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{
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unsigned long 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);
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return retval;
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}
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#define cmpxchg(ptr, o, n) \
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((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
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(unsigned long)(o), \
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(unsigned long)(n)))
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#include <asm-generic/cmpxchg-local.h>
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#endif /* _ASM_SCORE_CMPXCHG_H */
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