bitmap_find_free_region(9) centos man page | unix.com

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 3.10					     June 2014						   BITMAP_FIND_FREE_REG(9)