linux-kernel - Re: [PATCH 02/10] Driver core: Add iommu_ops to bus

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Date:	Fri, 23 Sep 2011 17:19:36 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Greg KH <gregkh@...e.de>
CC:	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	David Woodhouse <dwmw2@...radead.org>,
	David Brown <davidb@...eaurora.org>,
	"joro@...tes.org" <joro@...tes.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/10] Driver core: Add iommu_ops to bus_type

On Thu, Sep 22, 2011 at 04:11:55PM -0400, Greg KH wrote:
> On Thu, Sep 22, 2011 at 06:14:54PM +0200, Joerg Roedel wrote:
> > This is the starting point to make the iommu_ops used for
> > the iommu-api a per-bus-type structure. It is required to
> > easily implement bus-specific setup in the iommu-layer.
> > The first user will be the iommu-group attribute in sysfs.
> > 
> > Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> > ---
> >  drivers/base/bus.c     |   29 +++++++++++++++++++++++++++++
> >  drivers/iommu/iommu.c  |    4 ++++
> >  include/linux/device.h |   10 ++++++++++
> >  include/linux/iommu.h  |    2 ++
> >  4 files changed, 45 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/base/bus.c b/drivers/base/bus.c
> > index 000e7b2..b3014fe 100644
> > --- a/drivers/base/bus.c
> > +++ b/drivers/base/bus.c
> > @@ -1028,6 +1028,35 @@ void bus_sort_breadthfirst(struct bus_type *bus,
> >  }
> >  EXPORT_SYMBOL_GPL(bus_sort_breadthfirst);
> >  
> > +#ifdef CONFIG_IOMMU_API
> > +/**
> 
> This ifdef really isn't needed, is it?  I think you can remove it.

Actually, iommu_bus_init is only defined with CONFIG_IOMMU_API=y. But
you are right, the ifdef is not very nice here. I solved this situation
by moving the function into drivers/iommu/iommu.c which is only compiled
with CONFIG_IOMMU_API=y anyway, so no ifdef is required anymore.

> Other than that, looks much better, thanks.

Great, I sent a new round if these patches. Moving this function to
another file caused some changes in the following patches too during the
rebase.

Thanks,

	Joerg

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