linux-kernel - Re: [PATCH/RFC] powerpc: Fix mmap of PCI resource with hack for X

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Message-Id: <1163481386.5940.103.camel@localhost.localdomain>
Date:	Tue, 14 Nov 2006 16:16:26 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Miller <davem@...emloft.net>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	anton@...ba.org, airlied@...il.com, idr@...ibm.com,
	paulus@...ba.org
Subject: Re: [PATCH/RFC] powerpc: Fix mmap of PCI resource with hack for X

On Mon, 2006-11-13 at 21:07 -0800, David Miller wrote:
> From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Date: Tue, 14 Nov 2006 12:59:54 +1100
> 
> > If I "fix" the kernel to do the right thing, that is pass BAR values in
> > devices and expect BAR values in mmap, then I will break existing X
> > setups on machines where PCI is not mapped 1:1 (that is mostly CHRP
> > machines).
> > 
> > The problem I'm fixing in this patch is that while we were providing the
> > hacked up value in "devices", we were expecting the BAR value in mmap,
> > and there are apps expecting us to be consistent between the two, thus
> > the breakage.
> 
> Ok, I don't see much alternatives for you then.  I have no real
> objections to your patch.

Thanks. Fortunately, it's all going away soon :-)

Ben.


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