linux-kernel - Re: [PATCH 00/10] printk: Avoid deadlock in NMI + vprintk

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Message-ID: <alpine.LNX.2.00.1506021152270.16120@pobox.suse.cz>
Date:	Tue, 2 Jun 2015 11:52:53 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	"long.wanglong" <long.wanglong@...wei.com>
cc:	Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
	Petr Mladek <pmladek@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Dave Anderson <anderson@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Kay Sievers <kay@...y.org>, Michal Hocko <mhocko@...e.cz>,
	linux-kernel@...r.kernel.org, peifeiyue@...wei.com,
	dzickus@...hat.com, morgan.wang@...wei.com, sasha.levin@...cle.com,
	xuhanbing@...wei.com
Subject: Re: [PATCH 00/10] printk: Avoid deadlock in NMI + vprintk_emit()
 cleanup

On Tue, 2 Jun 2015, long.wanglong wrote:

> How about replacing printk function earlier? we can replace printk 
> function before we calling default_do_nmi(arch/x86/kernel/nmi.c) and 
> replace back after calling.
> 
> Is it a feasible solution? or does it introduce other problems?

This has been already discussed in the past when we were fixing the 
NMI-based stackdumping. See

	http://marc.info/?l=linux-kernel&m=141640218702588&w=2

-- 
Jiri Kosina
SUSE Labs
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