## 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

`unsigned long * bitmap`

array of unsigned longs corresponding to the bitmap

`unsigned int bits`

number of bits in the bitmap

`int 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.