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

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Message-Id: <20091110051037B.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 10 Nov 2009 05:11:20 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	penberg@...helsinki.fi
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	chrisw@...s-sol.org, dwmw2@...radead.org, joerg.roedel@....com,
	mingo@...e.hu
Subject: Re: [PATCH 01/10] Add iommu_init to x86_init_ops

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.
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