linux-kernel - RE: [RFC][PATCH -next] make pstore/kmsg_dump run after stopping other cpus in panic path

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Date:	Mon, 17 Oct 2011 09:56:50 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Don Zickus <dzickus@...hat.com>,
	Seiji Aguchi <seiji.aguchi@....com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"Chen, Gong" <gong.chen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Brown, Len" <len.brown@...el.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"hughd@...omium.org" <hughd@...omium.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"namhyung@...il.com" <namhyung@...il.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: RE: [RFC][PATCH -next] make pstore/kmsg_dump run after stopping
 other cpus in panic path

> All this lock busting probably isn't pretty and causes one to reflect what
> is going on here.  But as long as we are going to keep the kmsg_dump
> design, changes like this seem necessary to make sure the locking stays
> sane(r) for now.

So should we let the back-end know that locks have been busted?  I worry
that we'll get through the pstore layer by blasting away at any locks that
get in our way - but then the backend (which may well have been written on
the assumption that pstore serialized calls to it) will not do anything
useful (and may cause its own hang).

-Tony
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