arch/metag/include/asm/cmpxchg_irq.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_METAG_CMPXCHG_IRQ_H
   3 #define __ASM_METAG_CMPXCHG_IRQ_H
   4
   5 #include <linux/irqflags.h>
   6
   7 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
   8 {
   9         unsigned long flags, retval;
  10
  11         local_irq_save(flags);
  12         retval = *m;
  13         *m = val;
  14         local_irq_restore(flags);
  15         return retval;
  16 }
  17
  18 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
  19 {
  20         unsigned long flags, retval;
  21
  22         local_irq_save(flags);
  23         retval = *m;
  24         *m = val & 0xff;
  25         local_irq_restore(flags);
  26         return retval;
  27 }
  28
  29 static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
  30                                           unsigned long new)
  31 {
  32         __u32 retval;
  33         unsigned long flags;
  34
  35         local_irq_save(flags);
  36         retval = *m;
  37         if (retval == old)
  38                 *m = new;
  39         local_irq_restore(flags);       /* implies memory barrier  */
  40         return retval;
  41 }
  42
  43 #endif /* __ASM_METAG_CMPXCHG_IRQ_H */