1BITMAP_FIND_FREE_REG(9) Basic Kernel Library Functions BITMAP_FIND_FREE_REG(9)
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NAME

6       bitmap_find_free_region - find a contiguous aligned mem region
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SYNOPSIS

9       int bitmap_find_free_region(unsigned long * bitmap, int bits,
10                                   int order);
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ARGUMENTS

13       bitmap
14           array of unsigned longs corresponding to the bitmap
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16       bits
17           number of bits in the bitmap
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19       order
20           region size (log base 2 of number of bits) to find
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DESCRIPTION

23       Find a region of free (zero) bits in a bitmap of bits bits and allocate
24       them (set them to one). Only consider regions of length a power (order)
25       of two, aligned to that power of two, which makes the search algorithm
26       much faster.
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28       Return the bit offset in bitmap of the allocated region, or -errno on
29       failure.
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32Kernel Hackers Manual 3.10         June 2019           BITMAP_FIND_FREE_REG(9)
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