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cmpxchg-irq.h

#ifndef __ASM_SH_CMPXCHG_IRQ_H
#define __ASM_SH_CMPXCHG_IRQ_H

static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
{
      unsigned long flags, retval;

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

static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
{
      unsigned long flags, retval;

      local_irq_save(flags);
      retval = *m;
      *m = val & 0xff;
      local_irq_restore(flags);
      return retval;
}

static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
      unsigned long new)
{
      __u32 retval;
      unsigned long flags;

      local_irq_save(flags);
      retval = *m;
      if (retval == old)
            *m = new;
      local_irq_restore(flags);       /* implies memory barrier  */
      return retval;
}

#endif /* __ASM_SH_CMPXCHG_IRQ_H */

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