bitmap_find_free_region (9) Linux Manual Page
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.