| 1 |
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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
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| 13 |
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| 14 | |
| 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 |
| 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 | #if __CHAR_BIT__ * __SIZEOF_LONG__ != __BITS_PER_LONG
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| 23 | #error Inconsistent word size. Check asm/bitsperlong.h
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| 24 | #endif
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| 25 |
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| 26 | #ifndef __ASSEMBLER__
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| 27 | _Static_assert(sizeof(long) * 8 == __BITS_PER_LONG,
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| 28 | "Inconsistent word size. Check asm/bitsperlong.h");
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| 29 | #endif
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| 30 |
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| 31 | #ifndef BITS_PER_LONG_LONG
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| 32 | #define BITS_PER_LONG_LONG 64
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| 33 | #endif
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| 34 |
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| 35 | |
| 36 | * small_const_nbits(n) is true precisely when it is known at compile-time
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| 37 | * that BITMAP_SIZE(n) is 1, i.e. 1 <= n <= BITS_PER_LONG. This allows
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| 38 | * various bit/bitmap APIs to provide a fast inline implementation. Bitmaps
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| 39 | * of size 0 are very rare, and a compile-time-known-size 0 is most likely
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| 40 | * a sign of error. They will be handled correctly by the bit/bitmap APIs,
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| 41 | * but using the out-of-line functions, so that the inline implementations
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| 42 | * can unconditionally dereference the pointer(s).
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| 43 |
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| 44 | #define small_const_nbits(nbits) \
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| 45 | (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG && (nbits) > 0)
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| 46 |
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| 47 | #endif
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