linux-kernel - Re: [PATCH] add iommu_num

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Message-Id: <20080730221540S.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 30 Jul 2008 22:16:05 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	davem@...emloft.net, sfr@...b.auug.org.au,
	fujita.tomonori@....ntt.co.jp, mingo@...e.hu, mingo@...hat.com,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, bhavna.sarathy@....com,
	robert.richter@....com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, jbarnes@...tuousgeek.org,
	linux-next@...r.kernel.org
Subject: Re: [PATCH] add iommu_num_pages helper function

On Wed, 30 Jul 2008 14:18:05 +0200
Joerg Roedel <joerg.roedel@....com> wrote:

> On Tue, Jul 29, 2008 at 03:10:05AM -0700, David Miller wrote:
> > From: Joerg Roedel <joerg.roedel@....com>
> > Date: Tue, 29 Jul 2008 11:50:27 +0200
> > 
> > > I think moving that function to x86-only code is the best solution for
> > > now. Before moving it back to generic code we need an architecture
> > > independent way to find out the IOMMU page size.
> > 
> > My suggestion (again) is to pass it in as a "const unsigned long
> > io_page_size" argument and update the callers.
> 
> Ok, after setting up cross compile environments for sparc64 and
> powerpc64 I wrote a patch which adds the io_page_size argument to the
> iommu_num pages function and moves the function back to
> lib/iommu-helper.c.

You need ia64, parisc, and alpha too. :) 

I have cross compile environments for them so I can take care of them
if you like.


> The patch touches all 3 architectures and can not be
> split in a bisectable way.

How about naming a new helper function iommu_nr_pages (or something)?

Then you can do the conversion independently. If we like, we use
iommu_num_pages name after the conversion.


> Who is the best person to send this patch to?

The -mm is an appropriate tree, I think.
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