#ifndef __ASM_GENERIC_SHMBUF_H
  #define __ASM_GENERIC_SHMBUF_H
  
  #include <asm/bitsperlong.h>
  
  /*
   * The shmid64_ds structure for x86 architecture.
   * Note extra padding because this structure is passed back and forth
   * between kernel and user space.
   *
   * shmid64_ds was originally meant to be architecture specific, but
   * everyone just ended up making identical copies without specific
   * optimizations, so we may just as well all use the same one.
   *
   * 64 bit architectures typically define a 64 bit __kernel_time_t,
   * so they do not need the first two padding words.
   * On big-endian systems, the padding is in the wrong place.
   *
   *
   * Pad space is left for:
   * - 64-bit time_t to solve y2038 problem
   * - 2 miscellaneous 32-bit values
   */
  
  struct shmid64_ds {
  	struct ipc64_perm	shm_perm;	/* operation perms */
  	size_t			shm_segsz;	/* size of segment (bytes) */
  	__kernel_time_t		shm_atime;	/* last attach time */
  #if __BITS_PER_LONG != 64
  	unsigned long		__unused1;
  #endif
  	__kernel_time_t		shm_dtime;	/* last detach time */
  #if __BITS_PER_LONG != 64
  	unsigned long		__unused2;
  #endif
  	__kernel_time_t		shm_ctime;	/* last change time */
  #if __BITS_PER_LONG != 64
  	unsigned long		__unused3;
  #endif
  	__kernel_pid_t		shm_cpid;	/* pid of creator */
  	__kernel_pid_t		shm_lpid;	/* pid of last operator */
  	__kernel_ulong_t	shm_nattch;	/* no. of current attaches */
  	__kernel_ulong_t	__unused4;
  	__kernel_ulong_t	__unused5;
  };
  
  struct shminfo64 {
  	__kernel_ulong_t	shmmax;
  	__kernel_ulong_t	shmmin;
  	__kernel_ulong_t	shmmni;
  	__kernel_ulong_t	shmseg;
  	__kernel_ulong_t	shmall;
  	__kernel_ulong_t	__unused1;
  	__kernel_ulong_t	__unused2;
  	__kernel_ulong_t	__unused3;
  	__kernel_ulong_t	__unused4;
  };
  
  #endif /* __ASM_GENERIC_SHMBUF_H */