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Date: Tue, 28 Jun 2005 11:12:22 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Daniel Walker <dwalker@mvista.com>, Chuck Harding <charding@llnl.gov>,
       Linux Kernel Discussion List <linux-kernel@vger.kernel.org>
Subject: Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24
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* 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