1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_GENERIC_BITS_PER_LONG
3#define __ASM_GENERIC_BITS_PER_LONG
4
5#include <uapi/asm-generic/bitsperlong.h>
6
7
8#ifdef CONFIG_64BIT
9#define BITS_PER_LONG 64
10#else
11#define BITS_PER_LONG 32
12#endif /* CONFIG_64BIT */
13
14/*
15 * FIXME: The check currently breaks x86-64 build, so it's
16 * temporarily disabled. Please fix x86-64 and reenable
17 */
18#if 0 && BITS_PER_LONG != __BITS_PER_LONG
19#error Inconsistent word size. Check asm/bitsperlong.h
20#endif
21
22#ifndef BITS_PER_LONG_LONG
23#define BITS_PER_LONG_LONG 64
24#endif
25
26/*
27 * small_const_nbits(n) is true precisely when it is known at compile-time
28 * that BITMAP_SIZE(n) is 1, i.e. 1 <= n <= BITS_PER_LONG. This allows
29 * various bit/bitmap APIs to provide a fast inline implementation. Bitmaps
30 * of size 0 are very rare, and a compile-time-known-size 0 is most likely
31 * a sign of error. They will be handled correctly by the bit/bitmap APIs,
32 * but using the out-of-line functions, so that the inline implementations
33 * can unconditionally dereference the pointer(s).
34 */
35#define small_const_nbits(nbits) \
36 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG && (nbits) > 0)
37
38#endif /* __ASM_GENERIC_BITS_PER_LONG */
39