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Date: Fri, 11 Apr 2008 00:14:13 -0700
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "Thomas Gleixner" <tglx@linutronix.de>
Subject: Re: regression caused by: genirq: do not leave interupts enabled on free_irq
Cc: "Andrew Morton" <akpm@linux-foundation.org>, "Ingo Molnar" <mingo@elte.hu>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       "Jeff Garzik" <jeff@garzik.org>, "Ayaz Abdulla" <aabdulla@nvidia.com>,
       LKML <linux-kernel@vger.kernel.org>
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On Fri, Apr 11, 2008 at 12:01 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
> On Thu, 10 Apr 2008, Yinghai Lu wrote:
>  > last week found:
>  > after latest kernel kexec RHEL 5.1 or other stack kernel, the nvidia
>  > forcedeth doesn't work anymore.
>  >
>  > I stared at forcedeth.c two days. and revert every patches about that
>  > doesn't help.
>
>  So forcedeth does not come up again, when you kexec from linus.git
>  into an older distro kernel. Or is it the other way round ?
RHEL 5.1 kexec RHEL 5.1 : works
RHEL 5.1 kexec linus kernel: works
linus (after -rc2) kexec linus tree: works:
linus  (after -rc2) kexec RHEL 5.1 : forcedeth will not come up
linus ( before -rc2 include rc2) kexec RHEL 5.1 works

>
>  Does a non kexec boot work ?

Yes

>
>
>  > and figure out 2.6.25-rc2 works.
>  >
>  > with git-bisect found
>  >
>  > commit 89d694b9dbe769ca1004e01db0ca43964806a611
>  > Author: Thomas Gleixner <tglx@linutronix.de>
>  > Date:   Mon Feb 18 18:25:17 2008 +0100
>  >
>  >     genirq: do not leave interupts enabled on free_irq
>  >
>
> > caused the regression.
>  >
>  > it affected all my servers that are using Nvidia MCP55.
>  >
>  > maybe we need to revert that patch.
>
>  Which causes an interrupt storm on the enabled irq line, when the
>  interrupt line is still active for whatever reason. So we trade one
>  badness vs. the other.
>
>  Reverting the patch is not going to give us any answer about the real
>  problem.

but that interrupt storm bug already happend from .21 to .24

>
>  Is there anything in dmesg, which might give us an hint about that ?

everything looks normal.

YH