linux-kernel - Re: [PATCH] drm/i915: disable cpu relocs on ilk and earlier

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Message-ID: <20121015151119.GB30606@kroah.com>
Date:	Mon, 15 Oct 2012 08:11:19 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...il.com>,
	Chris Wilson <chris@...is-wilson.co.uk>, stable@...r.kernel.org
Subject: Re: [PATCH] drm/i915: disable cpu relocs on ilk and earlier

On Mon, Oct 15, 2012 at 10:11:22AM +0200, Daniel Vetter wrote:
> Hi Greg&stable-team,
> 
> The below patch papers over a graphics corruption issue in 3.5/3.6. The
> regression happened due to pwrite tunings in 3.5, which made cpu relocations
> much more likely.
> 
> The issue seems to have disappeared in 3.7-rc1, but it takes a few days to test
> a patch, so we haven't figured out what exactly fixed things. Now users are
> taking out their pitchforks already, so instead of wasting more days (maybe
> weeks?) to fully understand the bug before backporting the fix, we've opted for
> the below disable patch, which should have minimal impact (at most it undoes the
> tuning improvements in 3.5).
> 
> Patch is tested by reporters & acked by all relevant ppl, please apply to
> 3.5/3.6 series kernels.

No, I'd really like to wait until you figure out what is happening in
3.7-rc1 right now before applying the patch.  We have the rule, "it must
be in Linus's tree first" for a very good reason :)

So, I'll hold onto this until you say what's up with 3.7-rc1, ok?

thanks,

greg k-h
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