linux-kernel - Re: [PATCH -v2 0/7] powerpc: use asm-generic/dma-mapping-common.h

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Date:	Thu, 13 Aug 2009 09:41:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	benh@...nel.crashing.org, linuxppc-dev@...ts.ozlabs.org,
	galak@...nel.crashing.orga, beckyb@...nel.crashing.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -v2 0/7] powerpc: use asm-generic/dma-mapping-common.h


* FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> On Thu, 13 Aug 2009 15:48:42 +1000
> Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> 
> > On Wed, 2009-08-05 at 14:08 +0900, FUJITA Tomonori wrote:
> > 
> > > The above swiotlb patchset was merged in -tip so I think that merging
> > > this patchset via -tip too is the easiest way to handle this patchset.
> > > 
> > > The patchset also is available via a git tree:
> > > 
> > > git://git.kernel.org/pub/scm/linux/kernel/git/tomo/linux-2.6-misc.git powerpc
> > 
> > Hi !
> > 
> > While I generally agree here with the patches, I'm not sure it should be
> > merged via -tip since it mostly touches arch/powerpc files (and I need
> > to review it a bit more carefully, hopefully you'll have Ack's hitting
> > your mailbox later today).
> 
> Thanks!
> 
> This patchset depends on my swiotlb cleanup patchset:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/tomo/linux-2.6-misc.git swiotlb
> 
> http://marc.info/?l=linux-ia64&m=124718816520156&w=2
> 
> My swiotlb cleanup patchset has been in -tip. It might be easier 
> to merge both the swiotlb patchset and this patchset in powerpc 
> tree?

Ben, what's your preference? I waited for your reaction with these 
bits, i.e. they are not in tip:core/iommu yet.

One variant would be what Fujita suggested: you could pull 
core/iommu as a basis (it's a well-tested, problem-free tree at the 
moment, with no big risky items), and then pull/apply the powerpc 
specific bits from Fujita.

A second variant would be that we could pull these bits into 
core/iommu ... albeit you are right that the PowerPC tree is much 
better at testing PowerPC patches.

A third variant would be to wait with these bits until the swiotlb 
bits in core/iommu hit upstream. This would increase patch latency.

Any of these variants is good to me. What Fujita suggests seems to 
be the best to me: #1 gets us the most testing and the lowest 
latency - at the cost of tree dependency. We wont rebase core/iommu.

[ We've got three good tree properties: "tree independence",
  "good testing", "low patch latency", but we cannot have all
  three at once, we must pick two of them ;-) ]

	Ingo
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