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