linux-kernel - Re: DRM Error on Acer Aspire One

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Message-ID: <AANLkTikM916RlCBudL9_Pw--cpiu5mg_xcLFG9N1l9tL@mail.gmail.com>
Date:	Wed, 12 May 2010 08:22:49 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jaswinder Singh Rajput <jaswinderlinux@...il.com>,
	dri-devel@...ts.freedesktop.org, Dave Airlie <airlied@...ux.ie>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Keith Packard <keithp@...thp.com>,
	Eric Anholt <eric@...olt.net>, Ingo Molnar <mingo@...e.hu>
Subject: Re: DRM Error on Acer Aspire One

On Wed, May 12, 2010 at 5:57 AM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> On Tue, 11 May 2010 12:10:01 -0700, Andrew Morton <akpm@...ux-foundation.org> wrote:
>> On Tue, 11 May 2010 19:52:31 +0100
>> Chris Wilson <chris@...is-wilson.co.uk> wrote:
>>
>> > On Tue, 11 May 2010 11:35:55 -0400, Andrew Morton <akpm@...ux-foundation.org> wrote:
>> > > No, io_mapping_map_atomic_wc() cannot be used from [soft]irq context:
>> > > it hardwires use of KM_USER0.  I suggest that io_mapping_create_wc(),
>> > > io_mapping_map_atomic_wc() etc be changed so that the caller passes in the
>> > > KM_foo kmap slot index.
>> >
>> > Argh, sorry for the noise, read the mail in the wrong order. Thanks for
>> > the review. It would be sensible to go with your simpler patch whilst
>> > io_mapping_map_atomic_wc() is improved.
>>
>> OK.  I'll be sending a bunch of fixes Linuswards in an hour or two.
>> Should I include this?
>
> Yes.
>
> Acked-by: Chris Wilson <chris@...is-wilson.co.uk>
>

I'm not sure pushing this in at this point is a good idea, if I'm
reading it correctly we've no idea what KM_IRQ is being used for, and
this codepath is called from non-irq contexts just as much as irq
contexts.

I'd rather we just backout the hangcheck stuff touching copies at all
at this point, and try again doing it properly with a slow work or
something for later.

Dave.
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