Re: [Xenomai-help] spurious interrupt with latest release

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

stephane ancelot wrote:
> Le Thu, 04 Sep 2008 11:05:05 +0200, Gilles Chanteperdrix  
> <gilles.chanteperdrix@xenomai.org> a écrit:
> 
>> stephane ancelot wrote:
>>> Hi,
>>> Finally since I did not understand why this happened and to inhibit any
>>> driver writing related problems,I made the following architecture :
>>>
>>> a single 5ms task triggs a PLX 9050 INTCSR software register to activate
>>> INTA  (level irq)
>>>
>>> the rtdm interupt handler checks if IT comes from the PLX, disable PLX  
>>> IT,
>>> resets the software register , reenable PLX it,
>>> and ack irq rtdm
>>>
>>> However at random time , I have always spurious interrupt in this  
>>> handler.
>>> The time it occurs is random .
>>>
>>> attached my kernel config.gz
>> Hi,
>>
>> Did you check the differences in masking/acking/unmasking interrupts for
>> the interrupt controller you use between the I-pipe patch that works and
>> the I-pipe patch that does not work ?
>>
> 
> I know that it rocks with
> kernel 2.6.24.2 and  adeos-ipipe-2.6.24-x86-2.0-03.patch
> 
> it does not with :
> kernel 2.6.26.2 and adeos-ipipe-2.6.26-x86-2.0-09.patch

Well, it would be nice to try 2.6.25.

> Having a look at the patch I did not manage to find big differencies only  
> in entry_32.S sysenter for enabling hw it, but I am not sure if this part  
> of code may be related to my problem
> 
> The routed IRQ number is 18d
> 
> enabling ipipe and kernel debugging options does not help.
> 
> 
> It would be useful , if I could reproduce the problem using a standard  
> component of the PC to trig an IT like the PLX soft register, in order  
> produce a regression test and some people being able to reproduce  
> it.Supposing the same problem should appear :-)

And if you run cat /proc/interrupts on the two kernels, do you observe
any difference, as for instance, irqs changing from edge to level, or
from local-apic to IO-apic or to fasteoi, or whatever ?

-- 
                                                 Gilles.