Subject: Re: 2.6.24-rc6-mm1

From: Jarek Poplawski <[email-masked]>
Date: Wed, 9 Jan 2008 10:04:42 +0100

On Wed, Jan 09, 2008 at 08:57:53AM +0900, FUJITA Tomonori wrote:
...
> diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
> new file mode 100644
> index 0000000..495575a
> --- /dev/null
> +++ b/lib/iommu-helper.c
> @@ -0,0 +1,80 @@
> +/*
> + * IOMMU helper functions for the free area management
> + */
> +
> +#include <linux/module.h>
> +#include <linux/bitops.h>
> +
> +static unsigned long find_next_zero_area(unsigned long *map,
> +					 unsigned long size,
> +					 unsigned long start,
> +					 unsigned int nr,
> +					 unsigned long align_mask)
> +{
> +	unsigned long index, end, i;
> +again:
> +	index = find_next_zero_bit(map, size, start);
> +
> +	/* Align allocation */
> +	index = (index + align_mask) & ~align_mask;
> +
> +	end = index + nr;
> +	if (end >= size)
> +		return -1;

This '>=' looks doubtful to me, e.g.:
map points to 0s only,  size = 64, nr = 64,
we get: index = 0; end = 64;
and: return -1 ?!

Regards,
Jarek P.