On Wed, 21 May 2014, John Blackwood wrote:

I'm not 100% sure that the patch below will fix your problem, but we
saw something that sounds pretty familiar to your issue involving the
nvidia driver and the preempt-rt patch.  The nvidia driver uses the
completion support to create their own driver's notion of an internally
used semaphore.

And why should we care about that? If they abuse the completion code
then it's their problem. And it has nothing to do at all with the
problem Austin is observing.
 

Some tasks were failing to ever wakeup from wait_for_completion() calls
due to a race in the underlying do_wait_for_common() routine.

Why are you not fixing the nvidia crap instead of hacking utter shite
into the core kernel?

Thanks,

	tglx

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