include/linux/atmapi.h

   1 /* atmapi.h - ATM API user space/kernel compatibility */
   2
   3 /* Written 1999,2000 by Werner Almesberger, EPFL ICA */
   4
   5
   6 #ifndef _LINUX_ATMAPI_H
   7 #define _LINUX_ATMAPI_H
   8
   9 #if defined(__sparc__) || defined(__ia64__)
  10 /* such alignment is not required on 32 bit sparcs, but we can't
  11    figure that we are on a sparc64 while compiling user-space programs. */
  12 #define __ATM_API_ALIGN __attribute__((aligned(8)))
  13 #else
  14 #define __ATM_API_ALIGN
  15 #endif
  16
  17
  18 /*
  19  * Opaque type for kernel pointers. Note that _ is never accessed. We need
  20  * the struct in order hide the array, so that we can make simple assignments
  21  * instead of being forced to use memcpy. It also improves error reporting for
  22  * code that still assumes that we're passing unsigned longs.
  23  *
  24  * Convention: NULL pointers are passed as a field of all zeroes.
  25  */
  26
  27 typedef struct { unsigned char _[8]; } __ATM_API_ALIGN atm_kptr_t;
  28
  29 #endif