From: Peter Zijlstra <peterz@infradead.org>
To: "Liu, Chuansheng" <chuansheng.liu@intel.com>
Cc: "'linux-kernel@vger.kernel.org' (linux-kernel@vger.kernel.org)"
<linux-kernel@vger.kernel.org>, "kay@vrfy.org" <kay@vrfy.org>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"mingo@elte.hu" <mingo@elte.hu>
Subject: RE: [PATCH] printk: fixing the deadlock when calling printk in nmi handle
Date: Wed, 04 Jul 2012 16:12:51 +0200 [thread overview]
Message-ID: <1341411171.2507.123.camel@laptop> (raw)
In-Reply-To: <1341410957.2507.120.camel@laptop>
On Wed, 2012-07-04 at 16:09 +0200, Peter Zijlstra wrote:
> 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
Note that the one 'down' side of this is that the folks who care about
logbuf content might get upset since we don't put all msgs in there
anymore.
These would be the kmsg_dump users..
next prev parent reply other threads:[~2012-07-04 14:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-04 13:00 [PATCH] printk: fixing the deadlock when calling printk in nmi handle Liu, Chuansheng
2012-07-04 13:22 ` Peter Zijlstra
2012-07-04 13:30 ` Liu, Chuansheng
2012-07-04 13:39 ` Peter Zijlstra
2012-07-04 14:09 ` Peter Zijlstra
2012-07-04 14:12 ` Peter Zijlstra [this message]
2012-07-04 14:18 ` Liu, Chuansheng
2012-07-04 14:46 ` Liu, Chuansheng
2012-07-04 14:50 ` Peter Zijlstra
2012-07-04 14:52 ` Peter Zijlstra
2012-07-04 15:06 ` Liu, Chuansheng
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