linux-kernel - Re: [crash, PATCH] Revert "drm/radeon/kms: move radeon KMS on/off switch out of staging."

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Message-ID: <21d7e9971002041314yf8c55p4a7cb638efa0d24a@mail.gmail.com>
Date:	Fri, 5 Feb 2010 07:14:38 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Dave Airlie <airlied@...ux.ie>, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, dri-devel@...ts.sf.net
Subject: Re: [crash, PATCH] Revert "drm/radeon/kms: move radeon KMS on/off 
	switch out of staging."

On Fri, Feb 5, 2010 at 6:46 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Dave Airlie <airlied@...il.com> wrote:
>
>> On Wed, Feb 3, 2010 at 1:44 AM, Ingo Molnar <mingo@...e.hu> wrote:
>> >
>> > * Dave Airlie <airlied@...ux.ie> wrote:
>> >
>> >> > It's the moving of radeom KMS out of staging after -rc6 that causes it,
>> >> > because it brought it into the scope of my testing:
>> >> >
>> >> > ?f71d018: drm/radeon/kms: move radeon KMS on/off switch out of staging.
>> >> >
>> >> > So at least on this box it's clearly not ready for mainline enablement
>> >> > yet. I've attached the revert patch further below.
>> >>
>> >> Its not enabled by default so reverting this doesn't make much sense.
>> >
>> > I boot allyesconfig kernels regularly, which testing method works fine
>> > with another 2000+ upstream drivers. (including the dozens of drivers
>> > which match to active hardware components on that box)
>>
>> Okay this was something I wondered about, since these are *not*
>> allyesconfig .configs, I've generated some and CONFIG_FB_RADEON is always
>> on here, and you seem to not have that enabled (not that enabling it is a
>> good idea it is in fact a really bad idea).
>
> These were random configs - the size doesnt match an allyesconfig, those are
> way bigger. My above comment related to the first crash, and to my argument
> that all other drivers are fine during bootup - and there's a lot of them.
>
>> So do you have something you are running after allyesconfig to fix things?
>> or have you just got a config that is close enough to allyesconfig.
>>
>> I'm building kernels with your .config now and boot testing them on the
>> full range of hardware I have/
>
> Thanks. Is there something i can enable to get a better log for you to find
> out where (and why) it's hanging? It's still early during bootup so the box
> is not particularly debuggable - so i'm not sure i can get a task list dump,
> etc., unfortunately.
>

Do you have NMI watchdog enabled? (does it work that early)

a backtrace of where it hangs would be nice,

Also a dmesg from booting with drm.debug=15 might help narrow it down
also.

Dave.

>        Ingo
>
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