linux-kernel - Re: 2.6.24-rc6-mm1

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Date:	Wed, 09 Jan 2008 09:54:45 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	akpm@...ux-foundation.org
Cc:	fujita.tomonori@....ntt.co.jp, mingo@...e.hu,
	just.for.lkml@...glemail.com, tomof@....org, jarkao2@...il.com,
	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 Tue, 8 Jan 2008 16:27:39 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Wed, 09 Jan 2008 08:57:53 +0900
> FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
> > Andrew, can you replace
> > 
> > iommu-sg-add-iommu-helper-functions-for-the-free-area-management.patch
> > 
> > with the updated patch:
> > 
> > http://ozlabs.org/pipermail/linuxppc-dev/2007-December/048997.html
> > 
> > For your convenience I've attached the updated patch too.
> 
> <generates the incremental>

Thanks for putting the fix to -mm.


> > --- a/lib/iommu-helper.c~a
> > +++ a/lib/iommu-helper.c
> > @@ -8,15 +8,20 @@
> >  static unsigned long find_next_zero_area(unsigned long *map,
> >  					 unsigned long size,
> >  					 unsigned long start,
> > -					 unsigned int nr)
> > +					 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;
> 
> The ALIGN() macro is the approved way of doing this.
> 
> (I don't think ALIGN adds much value really, especially given that you've
> commented what's going on, but I guess it does make reviewing and reading a
> little easier).

Would be better to use __ALIGN_MASK? I can find only one user who
directly use __ALIGN_MASK. The POWER IOMMU calculates align_mask by
itself so it's easier to pass align_mask as an argument.
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