projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |