linux-kernel - Re: [PATCH 0/4 V3] Print traces on softlockup

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Message-ID: <20140423192228.GY8488@redhat.com>
Date:	Wed, 23 Apr 2014 15:22:28 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	davem@...emloft.net, sparclinux@...r.kernel.org, mguzik@...hat.com
Subject: Re: [PATCH 0/4 V3] Print traces on softlockup

On Tue, Apr 22, 2014 at 11:28:28AM -0700, Andrew Morton wrote:
> On Tue, 22 Apr 2014 11:17:24 -0400 Don Zickus <dzickus@...hat.com> wrote:
> 
> > Added more patches to handle the 'uniprocessor' panic case by sending NMIs
> > to every cpu but self.  Only affects x86, sparc.
> > 
> 
> Looks OK to me.  A couple of things:
> 
> - Patches 1-3 should be combined so we don't create bisection holes
>   due to x86 and sparc build errors.
> 
> - Patch 4 adds stuff which is unusable on uniprocessor, especially
>   the presence of /proc/sys/kernel/softlockup_all_cpu_backtrace.  We
>   already have #ifdef CONFIG_SMP in kern_table, so do more of that?

Are you suggesting just add CONFIG_SMP to kern_table entry or all the
pieces in kernel/watchdog.c too?  I wasn't sure how messy I should make
this patch.

Cheers,
Don
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