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
   7 struct __xchg_dummy { unsigned long a[100]; };
   8 #define __xg(x) ((struct __xchg_dummy *)(x))
   9
  10 static inline
  11 unsigned 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
  27 static 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 */