linux-kernel - Re: [PATCH] powerpc: use local var instead of local_paca->irq_happened directly in __check_irq

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Date:	Fri, 04 May 2012 10:10:07 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Wang Sheng-Hui <shhuiw@...il.com>
Cc:	Milton Miller <miltonm@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Anton Blanchard <anton@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: use local var instead of
 local_paca->irq_happened directly in __check_irq_replay

On Fri, 2012-05-04 at 07:35 +0800, Wang Sheng-Hui wrote:
> > No, Only comment the test, you must absolutely leave the
> > __hard_irq_disable() call ! That's the whole point of the test, make
> > sure we unconditionally disable to see if that fixes the problem, in
> > which case that will tell us that we somewhere accidentally leave
> > irq_happened set to 0x01 while irqs are hard enabled.
> 
> It can work.
> My system has been running for about 15 hours without crash.

Ok, so now we need to understand under what circumstances we end up
in a situation where paca->irq_happened is 0x01 and IRQs are hard
enabled. I have a few ideas of things to look at but I'm also off
for the week-end.

I'll have a look next week.

Cheers,
Ben.


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