linux-kernel - Re: [GIT *] iommu fixes for 2.6.28

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Message-Id: <20081024203705B.fujita.tomonori@lab.ntt.co.jp>
Date:	Fri, 24 Oct 2008 20:36:34 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	fujita.tomonori@....ntt.co.jp, dwmw2@...radead.org,
	torvalds@...ux-foundation.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, tony.luck@...el.com
Subject: Re: [GIT *] iommu fixes for 2.6.28

On Fri, 24 Oct 2008 13:22:17 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> * FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
> > On Fri, 24 Oct 2008 13:01:25 +0200
> > Ingo Molnar <mingo@...e.hu> wrote:
> > 
> > > 
> > > * David Woodhouse <dwmw2@...radead.org> wrote:
> > > 
> > > > This contains a few iommu-related fixes -- it restores DMA remapping 
> > > > on newer Intel hardware, which was disabled by the interrupt remapping 
> > > > patches, adds IA64 support for the Intel IOMMU, and some other small 
> > > > fixes.
> > > > 
> > > >  MAINTAINERS                      |    7 +
> > > >  arch/x86/kernel/amd_iommu_init.c |    2 +-
> > > >  arch/x86/kernel/pci-dma.c        |   16 ---
> > > >  drivers/pci/dmar.c               |  119 +++++++++++++-----
> > > >  drivers/pci/intel-iommu.c        |  250 ++++++++++++++++++++------------------
> > > >  drivers/pci/quirks.c             |   14 ++
> > > >  include/asm-x86/iommu.h          |    4 +
> > > >  include/linux/dma_remapping.h    |   27 ++--
> > > >  include/linux/intel-iommu.h      |   66 ++++++++---
> > > >  9 files changed, 305 insertions(+), 200 deletions(-)
> > > 
> > > hm, i just updated to v2.6.28-rc1, and these changes broke the x86 
> > > 32-bit build:
> > > 
> > >   arch/x86/kernel/built-in.o: In function `dma_supported':
> > >   (.text+0x5797): undefined reference to `forbid_dac'
> > >   arch/x86/kernel/built-in.o: In function `iommu_setup':
> > >   pci-dma.c:(.init.text+0x326c): undefined reference to `forbid_dac'
> > >   pci-dma.c:(.init.text+0x328b): undefined reference to `forbid_dac'
> > >   pci-dma.c:(.init.text+0x32aa): undefined reference to `forbid_dac'
> > > 
> > > seems to be caused by:
> > > 
> > >   5b6985c: intel-iommu: IA64 support
> > 
> > http://marc.info/?l=linux-kernel&m=122480590627590&w=2
> > 
> > 
> > Sharing forbid_dac between IA64 and X86 doesn't make sense and IA64 
> > doesn't even use forbid_dac... Reverting the forbid_dac relocation is 
> > the right fix, I think.
> 
> could you send a patch for it please? Commit 5b6985c does many things at 
> once so the revert is not trivial.

The above Fenghua's patch exactly does what I said (reverting the
forbid_dac relocation, which the commit 5b6985c did).
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