Re: Mitigation of license for the symbol __rt_mutex_init and more

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On Mon, Aug 08, 2011 at 01:10:22AM +0200, Andrey Gursky wrote:
> Hi!
> 
> Since coming of the linux-3.0-rt patch I've decided to try to switch
> to that kernel, especially the goal of the RT_PREEMPT claims to make a
> desktop kernel become a realtime one. Thanks to all rt-developers for
> this opportunity!
> 
> I'm testing it on 3 platforms:
> 1) notebook Core2Duo T7250,
> 2) old Pentium 4 3.2 GHz with an old passive ISDN hisax-card,
> 3) even older AthlonXP 2.8 GHz with TV-tuner.
> 
> The first desktop problem is:
> the symbol __rt_mutex_init is exported as GPL-only. This make the
> usage of proprietary nvidia driver impossible, while the normal
> __mutex_init is not only GPL. Could you change the license also for
> the rt_mutex_init (...and maybe few more if they being linked with
> nvidia/ati(?) driver just as with the vanilla "desktop" kernel)?
> 
> The next issue is more complicated. On the P4 (platform 2) I use an
> ISDN-hisax modem card and per-second internet account. After a timeout
> the connection is being hung up. In firefox I have a lot of tabs. Some
> web pages are "active". They try to call back on their own. While this
> is happening my gnome freezes sometimes. SysRq-R helps sometimes to
> switch back to the console. But the gdm doesn't start anymore. Is this
> a relevant issue for the rt-project? What'd be the first place to look
> at to debug this behavior?
enable PROVE_LOCKING and see if that claims to find something. You might
have to setup netconsole for that to work.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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