include/uapi/linux/atmapi.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /* atmapi.h - ATM API user space/kernel compatibility */
   3
   4 /* Written 1999,2000 by Werner Almesberger, EPFL ICA */
   5
   6
   7 #ifndef _LINUX_ATMAPI_H
   8 #define _LINUX_ATMAPI_H
   9
  10 #if defined(__sparc__) || defined(__ia64__)
  11 /* such alignment is not required on 32 bit sparcs, but we can't
  12    figure that we are on a sparc64 while compiling user-space programs. */
  13 #define __ATM_API_ALIGN __attribute__((aligned(8)))
  14 #else
  15 #define __ATM_API_ALIGN
  16 #endif
  17
  18
  19 /*
  20  * Opaque type for kernel pointers. Note that _ is never accessed. We need
  21  * the struct in order hide the array, so that we can make simple assignments
  22  * instead of being forced to use memcpy. It also improves error reporting for
  23  * code that still assumes that we're passing unsigned longs.
  24  *
  25  * Convention: NULL pointers are passed as a field of all zeroes.
  26  */
  27
  28 typedef struct { unsigned char _[8]; } __ATM_API_ALIGN atm_kptr_t;
  29
  30 #endif