linux-kernel - Re: [PATCH 1/3][-mm] add class

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Message-Id: <20080520103045.2bb0a033.akpm@linux-foundation.org>
Date:	Tue, 20 May 2008 10:30:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Dave Young" <hidave.darkstar@...il.com>
Cc:	greg@...ah.com, matthew@....cx, kay.sievers@...y.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 1/3][-mm] add class_reclassify macro

On Tue, 20 May 2008 19:05:21 +0800 "Dave Young" <hidave.darkstar@...il.com> wrote:

> On Tue, May 20, 2008 at 6:02 PM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> > On Tue, 20 May 2008 17:55:54 +0800 Dave Young <hidave.darkstar@...il.com> wrote:
> >
> >> Converting class semaphore to mutex cause lockdep warnings due to
> >> class_interface_register/unregister will possible call device_add/del
> >
> > Shouldn't we just fix that?
> 
> Andrew, could you tell more?

Well what are these lockdep warnings?  Normally such a warning means that
we have a locking bug. I _assume_ that you've determined that the warnings
are false-positives?

The warning which Mariusz Kozlowski discovered ("Subject: Re:
2.6.26-rc2-mm1: possible circular locking dependency detected") was
triggered by the "class semaphore to mutex" conversion and it looks
like a real bug to me.  Would your patch prevent warnings such as that
one from being available to us?

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