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, unsigned 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 4.8.                 January 2017                   BITMAP_FIND_FREE_REG(9)