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
31