Hi Nan hai,
On 1/31/07, Zou, Nanhai <[EMAIL PROTECTED]> wrote:
> On 1/31/07, Jay Lan <[EMAIL PROTECTED]> wrote:
> > Magnus Damm wrote:
> > > kexec: Avoid migration of already disabled irqs (ia64)
> > >
> > > This patch fixes up ia64 kexec support for HP rx2620 hardware. It does
this
> > > by skipping migration of already disabled irqs. This is most likely a
problem
> > > on other ia64 platforms as well, but I've only tested this on one machine
> > > so far.
> >
> > I have not seen this problem on SN systems.
>
> Ok, thanks. Let me give you more details.
>
> When I perform "kexec -e" the following output appears on my serial
> console (with my patch applied).
This patch is correct I think. I assume you will also see this bug when trying to
offline a CPU by echo 0 > /sys/devices/system/cpu/cpuX/online
You are right, I can trigger the bug that way too.
And the bug goes away with the patch. Excellent!
However it will not be triggered in crash dump case which has been tested
heavily on different kind of platforms. We do not migrate IRQ at the time of
crash. I guess that is why Jay has never seen it on SN platforms.
Booting into a crash kernel does not seem to work on this ia64 box
unfortunately. I'm about to investigate why, but I thought trying and
fixing kexec was a good first step.
Thanks for the help!
/ magnus
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