linux-kernel - Re: [PATCH, RESEND] microblaze: Fix level interrupt ACKing

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Date:	Tue, 24 Nov 2009 13:45:22 +0100
From:	Michal Simek <michal.simek@...alogix.com>
To:	steve@...idescorp.com
CC:	monstr@...str.eu, microblaze-uclinux@...e.uq.edu.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH, RESEND] microblaze: Fix level interrupt ACKing

Steven J. Magnani wrote:
> On Fri, 2009-11-20 at 12:07 +0100, Michal Simek wrote:
>> Hi Steve,
>>
>> steve@...idescorp.com wrote:
>>> Level interrupts need to be ack'd in the unmask handler, as in powerpc. 
>>> Among other issues, this bug causes the system clock to appear to run at 
>>> double-speed.
>> Can you send me any step-by-step manual how to demonstrate me this 
>> fault? If system clock runs at double-speed, then I should be able able 
>> to see that time is two times faster. Or do you mean different behavior?
> 
> Unless there's a way to read jiffies_64 in userspace, the easiest way I
> know of is to use the debugger. Stop the kernel soon after you boot it,
> and read jiffies_64. Continue execution for some known amount of
> wall-clock time, then stop the kernel again and recheck jiffies_64.
> Without the patch, the number of elapsed jiffies is twice what you'd
> expect based on HZ.

yes, I saw that behavior. Just thinking what caused that jiffies was two 
times faster.

But anyway. I added this patch to next branch.

Thanks,
Michal

> 
>> Thanks,
>> Michal
> 
> Regards,
> ------------------------------------------------------------------------
>  Steven J. Magnani               "I claim this network for MARS!
>  www.digidescorp.com              Earthling, return my space modulator!"
> 
>  #include <standard.disclaimer>
> 
> 
> 
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-- 
Michal Simek, Ing. (M.Eng)
PetaLogix - Linux Solutions for a Reconfigurable World
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