Message-ID: <3FAFC1D1.3090309@colorfullife.com>
Date: Mon, 10 Nov 2003 17:50:25 +0100
From: Manfred Spraul <manfred@colorfullife.com>
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To: Dave Jones <davej@redhat.com>
CC: Petr Vandrovec <vandrove@vc.cvut.cz>, linux-kernel@vger.kernel.org
Subject: Re: EFAULT reading /dev/mem... - broken x86info
References: <20031108162737.GB26350@vana.vc.cvut.cz> <20031110161114.GM10144@redhat.com>
In-Reply-To: <20031110161114.GM10144@redhat.com>
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Dave Jones wrote:

>I don't really have much insight into the behind the scenes going on's of
>DEBUG_PAGEALLOC, so I don't know if your suggestion has merit or not.
>Maybe Manfred can shed some insight?
>
DEBUG_PAGEALLOC is not the only user of change_page_attr: gart also 
removes it's pages from the linear mapping.
I think x86info should accept the -EFAULT as an indication that the 
targeted page is in use for other purpose, and definitively doesn't 
contain a mptable. The other option would be to change both 
DEBUG_PAGEALLOC and the AGP gart driver

>  This does seem to be a regression IMO
>(Though I am somewhat biased as this breaks my app 8-)
>
It breaks either your app or your AGP driver - what's simpler to fix? 
I'm biased, because if you update the AGP driver, then I must figure out 
how to fix DEBUG_PAGEALLOC 8-)

--
    Manfred

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