LXR linux/arch/score/include/asm/cmpxchg.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_SCORE_CMPXCHG_H
   3#define _ASM_SCORE_CMPXCHG_H
   4
   5#include <linux/irqflags.h>
   6
   7struct __xchg_dummy { unsigned long a[100]; };
   8#define __xg(x) ((struct __xchg_dummy *)(x))
   9
  10static inline
  11unsigned long __xchg(volatile unsigned long *m, unsigned long val)
  12{
  13        unsigned long retval;
  14        unsigned long flags;
  15
  16        local_irq_save(flags);
  17        retval = *m;
  18        *m = val;
  19        local_irq_restore(flags);
  20        return retval;
  21}
  22
  23#define xchg(ptr, v)                                            \
  24        ((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr),    \
  25                                        (unsigned long)(v)))
  26
  27static inline unsigned long __cmpxchg(volatile unsigned long *m,
  28                                unsigned long old, unsigned long new)
  29{
  30        unsigned long retval;
  31        unsigned long flags;
  32
  33        local_irq_save(flags);
  34        retval = *m;
  35        if (retval == old)
  36                *m = new;
  37        local_irq_restore(flags);
  38        return retval;
  39}
  40
  41#define cmpxchg(ptr, o, n)                                      \
  42        ((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
  43                                        (unsigned long)(o),     \
  44                                        (unsigned long)(n)))
  45
  46#include <asm-generic/cmpxchg-local.h>
  47
  48#endif /* _ASM_SCORE_CMPXCHG_H */
  49