BITMAP_FIND_FREE_REG(9) Basic Kernel Library Functions BITMAP_FIND_FREE_REG(9)NAMEbitmap_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.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 BITMAP_FIND_FREE_REG(9)