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Date:	Thu, 20 Sep 2007 17:06:05 -0500
From:	Matt Mackall <>
To:	Dave Airlie <>
Cc:	Andi Kleen <>,
	Andrew Morton <>,
	Jiri Slaby <>,
Subject: Re: X-freeze after clflush changes [Was: 2.6.23-rc6-mm1]

On Thu, Sep 20, 2007 at 11:42:29AM +1000, Dave Airlie wrote:
> > The code is broken anyways. If you free pages without flushing
> > them first some other innocent user allocating them will end up
> > with possible uncached pages for some time.
> >
> > Does this simple patch help?
> >
> I've attached a more complicated patch that does a 2 stage effort to
> unmapping and freeing pages. My kernel no longer hangs with this
> patch...
> Jiri can you confirm?

It's broken for me.

2.6.23-rc3-mm1: solid lock on X shutdown (noticed when upgrading)
      -rc4-mm1: solid lock on X shutdown, random solid locks about
                once every four hours
      -rc6-mm1: solid lock on X startup
   +your patch: screen goes black, turns off and on a few times during
                startup, can reboot with sysrq-b

Video is:

01:00.0 VGA compatible controller: ATI Technologies Inc Radeon R250
[Mobility FireGL 9000] (rev 02)

Mathematics is the supreme nostalgia of our time.
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