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       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