drm-next i915 regression? ( was: Re: PCI resources above 4GB)

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On Fri, 13 Apr 2012, 14:26:19 BST, Steven Newbury <steve@xxxxxxxxxxxxxxx> wrote:

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> On 13/04/12 13:49, Steven Newbury wrote:
> > On 13/04/12 12:58, Steven Newbury wrote:
> > 
> > > > It's not stable, crashes soon after GMA comes up. (Could be 
> > > > unrelated breakage in linus/master? Probably not but I will 
> > > > verify.)   I noticed the high allocations are occuring from the 
> > > > top of 64-bit address-space, whilst /proc/cpuinfo shows only
> > > > 48 bits of virtual addressing.   Could that be why..?
> > > To reply to myself again, I should have said crashes shortly
> > > after Xorg initialises using the intel driver, in both cases!
> > > I'm building a kernel now without the patch set to see if it's 
> > > unrelated.   If it still dies I'll try applying your patch set to
> > > a branch without the changes from linus/master... (should have
> > > done that anyway...)
> > 
> > Okay, I instead created a branch from an older 3.4-rc1+ kernel
> > tree, running it now, and it seems to be stable.   Something perhaps
> > in the newer tree not playing nicely.   I'll see if I can bisect it,
> > or at least base of rc2 if that works... (I'm a little wary of
> > crashing the system too much and losing my btrfs filesystem...)
> rc2 is fine as well.   Not sure what happened there, I need to be more
> careful about keeping a clean tree to work from.
I'm pretty sure the crash was a from a drm-next regression. I'll try bisecting it....
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