linux-kernel - Re: [PATCH 1/1] x86-64: introduce struct pci_sysdata to facilitate sharing of ->sysdata

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Message-ID: <20070712091029.GH4189@rhun.haifa.ibm.com>
Date:	Thu, 12 Jul 2007 12:10:29 +0300
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andi Kleen <ak@...e.de>, Jeff Garzik <jeff@...zik.org>,
	Yinghai Lu <Yinghai.Lu@....COM>, Andrew Morton <akpm@...l.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Jon Mason <jdmason@...il.com>
Subject: Re: [PATCH 1/1] x86-64: introduce struct pci_sysdata to facilitate sharing of ->sysdata

On Thu, Jul 12, 2007 at 09:17:31AM +0800, Arjan van de Ven wrote:
> On Wed, 2007-07-11 at 16:45 +0300, Muli Ben-Yehuda wrote:
> > Andi, please consider applying for 2.6.23. Applies on top of the
> > Calgary update I just sent out ("Calgary: more updates for 2.6.23").
> > 
> > This patch introduces struct pci_sysdata to x86 and x86-64, and
> > converts the existing two users (NUMA, Calgary) to use it.
> > 
> > This lays the groundwork for having other users of sysdata, such as
> > the PCI domains work.
> > 
> > The Calgary bits are tested, the NUMA bits just look ok.
> 
> I very much start to dislike the untyped "sysdata"... I much rather
> have separate fields for the different uses (like a IOMMU field)
> that aren't going to share ever. Possibly even typed, but for IOMMU
> that may be tricky....

Could you elaborate on what you mean here?

If you mean instead of hanging a pci_sysdata off of struct pci_bus,
hang a 'void *iommu' and an 'int node' directly off of the pci_bus,
that looks like a lot of churn (most architecture use sysdata as an
opaque pointer to an arch specific structure) and bloat (you would
need to hang off pci_bus everything that is in every arch's use of
sysdata!) for very little type safety.

Cheers,
Muli
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