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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
c31ae4bb AB |
2 | #ifndef __ASM_GENERIC_BITS_PER_LONG |
3 | #define __ASM_GENERIC_BITS_PER_LONG | |
4 | ||
8a1ab315 | 5 | #include <uapi/asm-generic/bitsperlong.h> |
c31ae4bb | 6 | |
c31ae4bb AB |
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 | ||
133fd9f5 DV |
22 | #ifndef BITS_PER_LONG_LONG |
23 | #define BITS_PER_LONG_LONG 64 | |
24 | #endif | |
25 | ||
586eaebe YN |
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 | ||
c31ae4bb | 38 | #endif /* __ASM_GENERIC_BITS_PER_LONG */ |