uapi/linux/atmapi.h

0001 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
0002 /* atmapi.h - ATM API user space/kernel compatibility */
0003
0004 /* Written 1999,2000 by Werner Almesberger, EPFL ICA */
0005
0006
0007 #ifndef _LINUX_ATMAPI_H
0008 #define _LINUX_ATMAPI_H
0009
0010 #if defined(__sparc__) || defined(__ia64__)
0011 /* such alignment is not required on 32 bit sparcs, but we can't
0012    figure that we are on a sparc64 while compiling user-space programs. */
0013 #define __ATM_API_ALIGN __attribute__((aligned(8)))
0014 #else
0015 #define __ATM_API_ALIGN
0016 #endif
0017
0018
0019 /*
0020  * Opaque type for kernel pointers. Note that _ is never accessed. We need
0021  * the struct in order hide the array, so that we can make simple assignments
0022  * instead of being forced to use memcpy. It also improves error reporting for
0023  * code that still assumes that we're passing unsigned longs.
0024  *
0025  * Convention: NULL pointers are passed as a field of all zeroes.
0026  */
0027
0028 typedef struct { unsigned char _[8]; } __ATM_API_ALIGN atm_kptr_t;
0029
0030 #endif