linux-kernel - Re: Linux 3.4-rc4

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Message-ID: <20120423024558.GD13840@phenom.dumpdata.com>
Date:	Sun, 22 Apr 2012 22:45:58 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Nick Bowler <nbowler@...iptictech.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Martin Peres <martin.peres@...ri.fr>,
	Ben Skeggs <bskeggs@...hat.com>,
	dri-devel@...ts.freedesktop.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 3.4-rc4

On Sun, Apr 22, 2012 at 08:05:54PM -0400, Nick Bowler wrote:
> On 2012-04-22 12:40 -0400, Nick Bowler wrote:
> > On 2012-04-21 21:51 -0700, Linus Torvalds wrote:
> > > Nick, I realize you had trouble with a bisection already, but it might
> > > really be worth trying again. Do a
> > > 
> > >     git bisect visualize
> > > 
> > > and try to pick a good commit (avoding the problems you hit) when you
> > > hit a problem, and then do
> > > 
> > >    git reset --hard <that-point>
> > > 
> > > to force bisection to try another place. That way you can sometimes
> > > avoid the problem spots, and continue the bisection.
> > 
> > Unfortunately, I think the whole swath of commits bisect wants to test
> > are broken (as in, they panic before I get to see whether or not the VGA
> > is working), because the commit from which most of the drm trees were
> > based appears to be broken.  Nevertheless, I've included the new bisect
> > log (four new commits marked skip as opposed to last time).  I've also
> > included the boot log from a crashing kernel, in case someone recognizes
> > how I can avoid this during bisection.  Note that this crash is *not* a
> > regression that exists in current mainline -- bisecting this issue was
> > the first time I had ever seen it.
> 
> Following up on the above, the commit which introduces the panics during
> boot is this one:

I think

dea7e0a ttm: fix agp since ttm tt rework

fixed that.
> 
> commit 8e7e70522d760c4ccd4cd370ebfa0ba69e006c6e
> Author: Jerome Glisse <jglisse@...hat.com>
> Date:   Wed Nov 9 17:15:26 2011 -0500
> 
>     drm/ttm: isolate dma data from ttm_tt V4
>     
>     Move dma data to a superset ttm_dma_tt structure which herit
>     from ttm_tt. This allow driver that don't use dma functionalities
>     to not have to waste memory for it.
>     
>     V2 Rebase on top of no memory account changes (where/when is my
>        delorean when i need it ?)
>     V3 Make sure page list is initialized empty
>     V4 typo/syntax fixes
>     
>     Signed-off-by: Jerome Glisse <jglisse@...hat.com>
>     Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
> 
> and the previous commit (3230cfc34fca: "drm/nouveau: enable the ttm dma
> pool when swiotlb is active V3") works properly.
> 
> Sometime this week I suppose I'll try to track down the commit which
> fixed the crashes...
> 
> Cheers,
> -- 
> Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
> 
> _______________________________________________
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> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
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