bitmap_find_free_region — find a contiguous aligned mem region
int bitmap_find_free_region ( | unsigned long * bitmap, |
| unsigned int bits, | |
int order); |
unsigned long * bitmaparray of unsigned longs corresponding to the bitmap
unsigned int bitsnumber of bits in the bitmap
int orderregion size (log base 2 of number of bits) to find
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.