include/asm-sparc/atops.h

   1 /* atops.h: Atomic SPARC operations.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   4  */
   5 #ifndef _SPARC_ATOPS_H
   6 #define _SPARC_ATOPS_H
   7
   8 #ifdef __SMP__
   9
  10 extern __inline__ __volatile__ unsigned char ldstub(volatile unsigned char *lock)
  11 {
  12         volatile unsigned char retval;
  13
  14         __asm__ __volatile__("ldstub [%1], %0\n\t" :
  15                              "=&r" (retval) :
  16                              "r" (lock));
  17         return retval;
  18 }
  19
  20 #endif
  21
  22 #endif