Re: Ingo's realtime_preempt patch causes kernel oops

[Sven-Thorsten Dietrich <sven@mvista.com>]

On Wed, 2006-05-24 at 18:55 +0200, Thomas Gleixner wrote:
> On Wed, 2006-05-24 at 12:38 -0400, Steven Rostedt wrote:
> > OK I haven't worked on arm much at all. Only had to port one board
> > before, and didn't need to get too involved.
> > 
> > Can't two devices share the same interrupt line? Not talking about a
> > cascading interrupt controller, but two actual devices that can trigger
> > a single interrupt line.  So, if this is the case, how do you disable a
> > particular source without going to the driver itself?
> 
> Yeah, the demux code has to go into the device driver to figure that
> out, which is not hard to do on SoC devices, as the peripherals are
> usually unique for a given SoC family.
> 
> PCI and other globally shared devices are completely differnt beasts and
> you would need a legion of hackers to fix that up.
> 

I am looking at a particular case where I am dealing with it on PCI, 
and sharing USB. 

In this particular case, the uhci USB driver is almost structured,
such that we can execute the lockless portion, and then run the locked
code in a thread...

Sven


> 	tglx
> 
> 
-- 
***********************************
Sven-Thorsten Dietrich
Real-Time Software Architect
MontaVista Software, Inc.
2901 Patrick Henry Drive, Suite 150
Santa Clara, CA 95054-1831 
 
Direct: 408.572.7870
Main: 408.572.8000
Fax: 408.572.8005

www.mvista.com
Platform To Innovate
***********************************