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

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Message-ID: <27240C0AC20F114CBF8149A2696CBE4A10C84B@SHSMSX101.ccr.corp.intel.com>
Date:	Wed, 4 Jul 2012 13:30:10 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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

> Yuck.. and no. This makes sane things like early 8250 serial console less
> reliable.
Peter, could you share more? I took many time to dig out this issue.
Anyway, in nmi handler, calling printk is dangerous. This patch is for this case.