From: "Magnus Damm" <magnus.damm@gmail.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Fastboot] [PATCH] kexec: Avoid migration of already disabled irqs (ia64)
Date: Wed, 31 Jan 2007 05:57:54 +0000 [thread overview]
Message-ID: <aec7e5c30701302157r3432d681wae1485fc07ceebe9@mail.gmail.com> (raw)
In-Reply-To: <45C005C1.5010606@sgi.com>
Hi Nan hai,
On 1/31/07, Zou, Nanhai <nanhai.zou@intel.com> wrote:
> > On 1/31/07, Jay Lan <jlan@sgi.com> 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
next prev parent reply other threads:[~2007-01-31 5:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-31 2:58 [Fastboot] [PATCH] kexec: Avoid migration of already disabled Jay Lan
2007-01-31 3:49 ` [Fastboot] [PATCH] kexec: Avoid migration of already disabled irqs (ia64) Magnus Damm
2007-01-31 4:54 ` Zou, Nanhai
2007-01-31 5:57 ` Magnus Damm [this message]
2007-01-31 6:07 ` Zou, Nanhai
2007-01-31 18:09 ` [Fastboot] [PATCH] kexec: Avoid migration of already disabled Jay Lan
2007-02-01 6:02 ` [Fastboot] [PATCH] kexec: Avoid migration of already disabled irqs (ia64) Magnus Damm
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