linux-kernel - Re: 2.6.24-rc7 lockdep warning when poweroff

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Message-Id: <1200441293.5887.158.camel@johannes.berg>
Date:	Wed, 16 Jan 2008 00:54:53 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Dave Young <hidave.darkstar@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Oleg Nesterov <oleg@...sign.ru>
Subject: Re: 2.6.24-rc7 lockdep warning when poweroff


> > Turns out that there are many users that give a dynamic string as the
> > workqueue name (only the first three are relevant for the problem at
> > hand because the others are single-threaded):
> 
> I'm not sure the single threadedness of a workqueue matters here.

Oh I should have explained this, missed it earlier. No, the
single-threadedness doesn't really matter for the problem, but the
warning Dave got couldn't possibly have triggered for a single-threaded
workqueue because it was from the CPU up/down code that spawns/stops the
new workqueue thread on a new/dying CPU.

johannes

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