linux-kernel - Re: 2.6.24-rc6-mm1

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Message-Id: <20080110095421R.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 10 Jan 2008 09:54:21 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	jarkao2@...il.com
Cc:	fujita.tomonori@....ntt.co.jp, mingo@...e.hu,
	akpm@...ux-foundation.org, just.for.lkml@...glemail.com,
	tomof@....org, herbert@...dor.apana.org.au,
	linux-kernel@...r.kernel.org, neilb@...e.de, bfields@...ldses.org,
	netdev@...r.kernel.org, tom@...ngridcomputing.com
Subject: Re: 2.6.24-rc6-mm1

On Wed, 9 Jan 2008 10:04:42 +0100
Jarek Poplawski <jarkao2@...il.com> wrote:

> 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 ?!

You are right. I did it only because I didn't want to change the
original code (iommu_range_alloc in arch/powerpc/kernel/iommu.c). I
thought that there might be a mysterious reason for it so I let it
alone since it's tiny loss.

Thanks,
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