linux-kernel - Re: [PATCH v3 3/3] Improve container_notify

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Date:	Thu, 01 Nov 2012 15:51:42 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Yinghai Lu <yinghai@...nel.org>, ZhangRui <rui.zhang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	Tang Chen <tangchen@...fujitsu.com>, bhelgaas@...gle.com,
	jiang.liu@...wei.com, izumi.taku@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] Improve container_notify_cb() to support
 container hot-remove.


> > >> Hi Yinghai,
> > >>
> > >> Per the following thread, the code seems to be written in this way to
> > >> allocate a separate lock_class_key for each work queue.  It should have
> > >> had some comment to explain this, though.
> > >>
> > >> https://lkml.org/lkml/2009/12/13/304
> > >
> > > The code has evolved since then, however, so that it doesn't make sense
> > > any more.
> > >
> > 
> > oh, no, that commit should not be reverted. instead we should add some
> > comment for it...
> > 
> > that mean : three path, will have three separated static lock dep key
> > from every INIT_WORK.
> 
> I see.
> 
> OK, I'll drop the patch removing it.
> 
> What about the following comment:
> 
> "To prevent lockdep from complaining unnecessarily, make sure that there
>  is a different static lockdep key created for each workqueue by using
>  INIT_WORK for each of them separately."

Looks good to me.

Thanks,
-Toshi


> 
> Thanks,
> Rafael
> 
> 


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