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38 lines
1.2 KiB
38 lines
1.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_GENERIC_BITS_PER_LONG |
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#define __ASM_GENERIC_BITS_PER_LONG |
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#include <uapi/asm-generic/bitsperlong.h> |
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#ifdef CONFIG_64BIT |
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#define BITS_PER_LONG 64 |
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#else |
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#define BITS_PER_LONG 32 |
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#endif /* CONFIG_64BIT */ |
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/* |
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* FIXME: The check currently breaks x86-64 build, so it's |
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* temporarily disabled. Please fix x86-64 and reenable |
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*/ |
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#if 0 && BITS_PER_LONG != __BITS_PER_LONG |
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#error Inconsistent word size. Check asm/bitsperlong.h |
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#endif |
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#ifndef BITS_PER_LONG_LONG |
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#define BITS_PER_LONG_LONG 64 |
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#endif |
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/* |
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* small_const_nbits(n) is true precisely when it is known at compile-time |
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* that BITMAP_SIZE(n) is 1, i.e. 1 <= n <= BITS_PER_LONG. This allows |
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* various bit/bitmap APIs to provide a fast inline implementation. Bitmaps |
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* of size 0 are very rare, and a compile-time-known-size 0 is most likely |
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* a sign of error. They will be handled correctly by the bit/bitmap APIs, |
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* but using the out-of-line functions, so that the inline implementations |
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* can unconditionally dereference the pointer(s). |
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*/ |
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#define small_const_nbits(nbits) \ |
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(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG && (nbits) > 0) |
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#endif /* __ASM_GENERIC_BITS_PER_LONG */
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