linux-kernel - RE: [PATCH] printk: fixing the deadlock when calling printk in nmi handle

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Message-ID: <1341410957.2507.120.camel@laptop>
Date:	Wed, 04 Jul 2012 16:09:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
Cc:	"'linux-kernel@...r.kernel.org' (linux-kernel@...r.kernel.org)" 
	<linux-kernel@...r.kernel.org>, "kay@...y.org" <kay@...y.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"mingo@...e.hu" <mingo@...e.hu>
Subject: RE: [PATCH] printk: fixing the deadlock when calling printk in nmi
 handle

On Wed, 2012-07-04 at 15:39 +0200, Peter Zijlstra wrote:
> > Anyway, in nmi handler, calling printk is dangerous. This patch is for this case.
> 
> But its ugly and decreases reliability..  Your 'solution' is to
> basically ignore serialization and pray, that's not a solution, that's
> gambling. 

If you want to fix it, do something like:

  http://marc.info/?l=linux-kernel&m=132446646923333

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