linux-kernel - Re: [tip:core/ipi] generic-ipi: eliminate spurious pointless WARN

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Date:	Fri, 13 Mar 2009 10:31:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	jbeulich@...ell.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/ipi] generic-ipi: eliminate spurious pointless
	WARN_ON()s


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Fri, 2009-03-13 at 01:39 +0000, Jan Beulich wrote:
> > Commit-ID:  6a09dfa870ba0ed21b1124539968a36b42660661
> > Gitweb:     http://git.kernel.org/tip/6a09dfa870ba0ed21b1124539968a36b42660661
> > Author:     Jan Beulich <jbeulich@...ell.com>
> > AuthorDate: Thu, 12 Mar 2009 13:21:50 +0000
> > Commit:     Ingo Molnar <mingo@...e.hu>
> > CommitDate: Fri, 13 Mar 2009 02:14:41 +0100
> > 
> > generic-ipi: eliminate spurious pointless WARN_ON()s
> > 
> > Namely during early boot, the panic() or BUG() paths may end up in
> > smp_call_function_*() with just a single online CPU. In that situation
> > the warnings generated are not only meaningless, but also result in
> > relevant output being cluttered.
> > 
> > Therefore, defer the WARN_ON() checks until after the (unaffected from
> > the problem that is being attempted to be detected here) cases have
> > been handled.
> > 
> > Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> > LKML-Reference: <49B91A7E.76E4.0078.0@...ell.com>
> > Signed-off-by: Ingo Molnar <mingo@...e.hu>
> 
> I don't really like this,.. it moves the WARN_ON to weird 
> locations without an explanatory comment.

ok, i've reverted it for now.

	Ingo
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