summaryrefslogtreecommitdiffstats
path: root/include/uapi/asm-generic/bitsperlong.h
blob: 352cb81947b87697960486e4af4e48313e891d3d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI__ASM_GENERIC_BITS_PER_LONG
#define _UAPI__ASM_GENERIC_BITS_PER_LONG

#ifndef __BITS_PER_LONG
/*
 * In order to keep safe and avoid regression, only unify uapi
 * bitsperlong.h for some archs which are using newer toolchains
 * that have the definitions of __CHAR_BIT__ and __SIZEOF_LONG__.
 * See the following link for more info:
 * https://lore.kernel.org/linux-arch/b9624545-2c80-49a1-ac3c-39264a591f7b@app.fastmail.com/
 */
#if defined(__CHAR_BIT__) && defined(__SIZEOF_LONG__)
#define __BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__)
#else
/*
 * There seems to be no way of detecting this automatically from user
 * space, so 64 bit architectures should override this in their
 * bitsperlong.h. In particular, an architecture that supports
 * both 32 and 64 bit user space must not rely on CONFIG_64BIT
 * to decide it, but rather check a compiler provided macro.
 */
#define __BITS_PER_LONG 32
#endif
#endif

#endif /* _UAPI__ASM_GENERIC_BITS_PER_LONG */