bitmap_find_free_region man page on Oracle

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

NAME
       bitmap_find_free_region - find a contiguous aligned mem region

SYNOPSIS
       int bitmap_find_free_region(unsigned long * bitmap, int bits,
				   int order);

ARGUMENTS
       bitmap
	   array of unsigned longs corresponding to the bitmap

       bits
	   number of bits in the bitmap

       order
	   region size (log base 2 of number of bits) to find

DESCRIPTION
       Find a region of free (zero) bits in a bitmap of bits bits and allocate
       them (set them to one). Only consider regions of length a power (order)
       of two, aligned to that power of two, which makes the search algorithm
       much faster.

       Return the bit offset in bitmap of the allocated region, or -errno on
       failure.

COPYRIGHT
Kernel Hackers Manual 3.8.	   June 2014	       BITMAP_FIND_FREE_REG(9)
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