Date: Tue, 2 Jun 2015 11:52:53 +0200 (CEST)
From: Jiri Kosina <jkosina@suse.cz>
To: "long.wanglong" <long.wanglong@huawei.com>
cc: Jan Kara <jack@suse.cz>, Andrew Morton <akpm@linux-foundation.org>,
        Petr Mladek <pmladek@suse.cz>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Dave Anderson <anderson@redhat.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Kay Sievers <kay@vrfy.org>, Michal Hocko <mhocko@suse.cz>,
        linux-kernel@vger.kernel.org, peifeiyue@huawei.com, dzickus@redhat.com,
        morgan.wang@huawei.com, sasha.levin@oracle.com, xuhanbing@huawei.com
Subject: Re: [PATCH 00/10] printk: Avoid deadlock in NMI + vprintk_emit()
 cleanup
In-Reply-To: <556D7B74.2070007@huawei.com>
Message-ID: <alpine.LNX.2.00.1506021152270.16120@pobox.suse.cz>
References: <1432557993-20458-1-git-send-email-pmladek@suse.cz> <20150529135045.09d87c7ab98bf26dec95c8b3@linux-foundation.org> <20150601130616.GE20288@quack.suse.cz> <556D7B74.2070007@huawei.com>
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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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