RE: [PATCH] printk: fixing the deadlock when calling printk in nmihandle

From: Peter Zijlstra
Date: Wed Jul 04 2012 - 10:13:02 EST

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:

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

These would be the kmsg_dump users..

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