Re: [PATCH 1/3][-mm] add class_reclassify macro

From: Greg KH
Date: Tue May 20 2008 - 13:26:23 EST

On Tue, May 20, 2008 at 03:02:32AM -0700, Andrew Morton wrote:
> On Tue, 20 May 2008 17:55:54 +0800 Dave Young <hidave.darkstar@xxxxxxxxx> 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?

Um, no, that's a "feature" that some types of hardware and interfaces

This is one reason I really don't like this type of conversion, it's
causing lots of problems for no known gain.

So I would just recommend dropping this patch set, the current "convert
class semaphore to a mutex" patch in the -mm tree is already causing
lockdep warnings, and trying to do something like this isn't really
going to solve the root problem here.


greg k-h
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