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

Ingo Molnar
2005-06-28T09:12:57Z

* Ingo Molnar <mingo@elte.hu> wrote:

> * Steven Rostedt <rostedt@goodmis.org> 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