linux-kernel - Re: [PATCH 01/10] Add iommu_init to x86_init

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Date:	Tue, 10 Nov 2009 05:45:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	penberg@...helsinki.fi, linux-kernel@...r.kernel.org,
	chrisw@...s-sol.org, dwmw2@...radead.org, joerg.roedel@....com
Subject: Re: [PATCH 01/10] Add iommu_init to x86_init_ops


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

> On Mon, 9 Nov 2009 22:02:24 +0200
> Pekka Enberg <penberg@...helsinki.fi> wrote:
> 
> > On Wed, Oct 28, 2009 at 8:47 AM, FUJITA Tomonori
> > <fujita.tomonori@....ntt.co.jp> wrote:
> > > We call the detections functions of all the IOMMUs then all their
> > > initialization functions. THe latter is pointless since we don't
> > > detect multiple different IOMMUs. What we need to do is calling the
> > > initialization function of the detected IOMMU.
> > >
> > > This adds iommu_init hook to x86_init_ops so if an IOMMU detection
> > > function can set its initialization function to the hook.
> > >
> > > Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > > ---
> > > ?arch/x86/include/asm/iommu.h ? ?| ? ?1 +
> > > ?arch/x86/include/asm/x86_init.h | ? ?9 +++++++++
> > > ?arch/x86/kernel/pci-dma.c ? ? ? | ? ?2 ++
> > > ?arch/x86/kernel/x86_init.c ? ? ?| ? ?5 +++++
> > > ?4 files changed, 17 insertions(+), 0 deletions(-)
> > >
> > > diff --git a/arch/x86/include/asm/iommu.h b/arch/x86/include/asm/iommu.h
> > > index fd6d21b..42aa977 100644
> > > --- a/arch/x86/include/asm/iommu.h
> > > +++ b/arch/x86/include/asm/iommu.h
> > > @@ -3,6 +3,7 @@
> > >
> > > ?extern void pci_iommu_shutdown(void);
> > > ?extern void no_iommu_init(void);
> > > +static inline int iommu_init_noop(void) { return 0; }
> > 
> > Why is this function not put in x86_init.c?
> 
> If it's fine by x86 maintainers, I'll do in the next version.

Sure, that looks good to me.

	Ingo
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