linux/include/linux/atmapi.h
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   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 
  27typedef struct { unsigned char _[8]; } __ATM_API_ALIGN atm_kptr_t;
  28
  29#endif
  30
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