Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24

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On Tue, 28 Jun 2005, Chuck Harding wrote:


On Tue, 28 Jun 2005, Ingo Molnar wrote:



* Ingo Molnar <[email protected]> wrote:


* Steven Rostedt <[email protected]> wrote:


Although turning off apm works, this is a fix to the symptom and not a
cure.  Has someone already taken a look at this code? Since
apm_bios_call_simple calls local_save_flags and afterwards
raw_lock_irq_restore is then called.  Shouldn't that have been
raw_local_save_flags?


ah, indeed. I fixed this bug and have uploaded the -50-26 patch.
Chuck, does this fix the APM problems for you?


i've also uploaded -50-27 in which i've improved the irq-flags debugging
code. They are activated if CONFIG_DEBUG_PREEMPT is enabled, and can
come in two variants of kernel messages:

BUG: bad raw irq-flag value 80000000, test/3810!
BUG: bad soft irq-flag value 00000202, test/3810!

so we should now be able to detect mismatches of irq flags right where
they occur.

	Ingo


Ack!! I didn't have that enabled so I am rebuilding again. One thing I've
noticed is that sox seems to be hanging when it is trying to play a .wav
file (for system beeps) and there aren't any error messages about what
might be going on.




More info - sox is locked up so tight that no kill can stop it. I'm not
seeing any of the BUG messages either even though I enabled CONFIG_DEBUG_PREEMPT. 

--
Charles D. (Chuck) Harding <[email protected]>  Voice: 925-423-8879
Senior Computer Associate         ICCD            Fax: 925-423-6961
Lawrence Livermore National Laboratory      Computation Directorate
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