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

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Date:	Wed, 16 Jan 2008 09:11:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Johannes Berg <johannes@...solutions.net>,
	Dave Young <hidave.darkstar@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>
Subject: Re: 2.6.24-rc7 lockdep warning when poweroff


* Peter Zijlstra <peterz@...radead.org> wrote:

> > > The patch looks ok, one important thing to note is that it means 
> > > that all workqueues instantiated by the same __create_workqueue() 
> > > call-site share lock dependency chains - I'm unsure if that might 
> > > get us into trouble or not.
> > 
> > It doesn't seem to have so far ;) I don't think it should. If some 
> > code allocates a per-instance workqueue that's much like having an 
> > inode lock or so.
> 
> We had to split up the inode lock to per filesystem classes, just 
> because the lock chains were conflicting between them...

i.e. filesystems can legally have different locking rules wrt. i_lock. I 
dont really like it (we should have as simple locking rules as possible) 
but it is the VFS status quo :)

	Ingo
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