[LAU] rt audio with kernel 3.0 - looking good

[hermann]

Am Mittwoch, den 10.08.2011, 02:56 +0000 schrieb sonofzev at iinet.net.au:
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> On Wed Aug 10 12:31 , Oon-Ee Ng  sent:
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> >
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> >On Aug 10, 2011 9:11 AM, "sonofzev at iinet.net.au" <sonofzev at iinet.net.au> wrote:
> >
> >>
> >
> >>
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> >> On Wed Aug 10  8:43 , Arve Barsnes  sent:
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> >> >On 9 August 2011 21:54, Atte André Jensen atte at email.dk> wrote:
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> >> >> On 08/09/2011 09:03 PM, david wrote:
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> >> >>
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> >> >>> My brief experience with Kernel 3.0 came with the discovery that it
> >
> >> >>> doesn't support the NV video driver,
> >
> >> >>
> >
> >> >> That doesn't sound good...
> >
> >> >>
> >
> >> >Is that with a rt kernel or vanilla? Remember, you need to patch the
> >
> >> >nvidia drivers to function with the later rt kernels.
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> >> >
> >
> >> >Arve
> >
> >> I had this pain with the rt kernel.. (only).. can someone point out a link to the
> >
> >> patch for the nvidia-drivers...
> >I asked about that on the rt list, but some symbols are exported GPL by the
> rt-patch which disallows their use by the nvidia binary. Patching that would
> probably violate the GPL.
> >
> Ouch.. 
> 
> It does seem there is a way around the problem so if there isn't an available
> diff, are there some manual instructions anywhere that allow them to cooperate? 
> 
> 
as far I know you need to convert 3 symbols to EXPORT_SYMBOL instead
EXPORT_SYMBOL_GPL. That are 

__rt_mutex_init
migrate_enable
migrate_disable

You could find them in the source by

grep 'EXPORT_SYMBOL_GPL(migrate_disable)' -R ./ 

./kernel/sched.c:EXPORT_SYMBOL_GPL(migrate_disable);

grep 'EXPORT_SYMBOL_GPL(migrate_enable)' -R ./ 

./kernel/sched.c:EXPORT_SYMBOL_GPL(migrate_enable); 

grep 'EXPORT_SYMBOL_GPL(__rt_mutex_init)' -R ./ 

/kernel/rtmutex.c:EXPORT_SYMBOL_GPL(__rt_mutex_init)

With a proper sed you could replace it, or do it by hand.
But I'm no Nvidia user, cant promise that this is right. 
That is just what I've heard.
Note, doing this as end user didn't violate the GPL.

greats
hermann