Divyesh Shah :
quoted text
> Hi Gui,
>     Thanks for the report. I can reproduce this and have a patch that
> fixes it and makes the warning go away. My understanding of what was
> happening is that the stats_lock for the root cfqg was not getting
> initialized and hence was missing the static lock_class_key
> declaration. This is because we call blkio_group_init() only when
> dynamically allocating new cfqg which does not cover the root cfqg.
> I'll send out the patch next.
> 

We just found out the cause and was about to make a fix. :)

-- Li
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