linux-kernel - Re: agp: two-stage page destruction issue

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Message-Id: <485A4715.76E4.0078.0@novell.com>
Date:	Thu, 19 Jun 2008 10:46:29 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Dave Airlie" <airlied@...il.com>
Cc:	"Dave Airlie" <airlied@...ux.ie>, <linux-kernel@...r.kernel.org>
Subject: Re: agp: two-stage page destruction issue

>>> "Dave Airlie" <airlied@...il.com> 19.06.08 01:57 >>>
>On Wed, Jun 18, 2008 at 6:28 PM, Jan Beulich <jbeulich@...ell.com> wrote:
>> Dave,
>>
>> besides it apparently being useful only in 2.6.24 (the changes in 2.6.25
>> really mean that it could be converted back to a single-stage mechanism),
>> I'm seeing an issue in Xen Dom0 kernels, which is caused by the calling
>> of gart_to_virt() in the second stage invocations of the destroy function.
>> I think that besides this being a real issue with Xen (where
>> unmap_page_from_agp() is not just a page table attribute change), this
>> also is invalid from a theoretical perspective: One should not assume that
>> gart_to_virt() is still valid after unmapping a page. So minimally (keeping
>> the 2-stage mechanism) a patch like the one below would be needed.
>>
>
>Looks good to me, its the simpler change for 2.6.26 at this point.
>
>Dave.

So if you're considering it even for 2.6.26, will you push it to Linus? That's
how I understand the process would generally work, or should I push it
in this case (in which case it might be good to know whether your above
statement should be translated into an Acked-by or Signed-off-by)?

Thanks, Jan

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