Re: [PATCH, RESEND] microblaze: Fix level interrupt ACKing
From: Michal Simek
Date: Tue Nov 24 2009 - 07:45:37 EST
Steven J. Magnani wrote:
On Fri, 2009-11-20 at 12:07 +0100, Michal Simek wrote:
Hi Steve,
steve@xxxxxxxxxxxxxxx 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)
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