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 2.6. July 2015 BITMAP_FIND_FREE_REG(9)