linux-kernel - Re: [PATCHSET v3 driver-core-next] kernfs, sysfs, driver-core: implement synchronous self-removal

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Message-ID: <20140113211715.GB3480@mtj.dyndns.org>
Date:	Mon, 13 Jan 2014 16:17:15 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, stern@...land.harvard.edu,
	JBottomley@...allels.com, bhelgaas@...gle.com
Subject: Re: [PATCHSET v3 driver-core-next] kernfs, sysfs, driver-core:
 implement synchronous self-removal

On Sat, Jan 11, 2014 at 01:45:13PM -0500, Tejun Heo wrote:
> Hey, Greg.
> 
> On Fri, Jan 10, 2014 at 04:19:53PM -0800, Greg KH wrote:
> > > It's really late in the -rc cycle for me to take this for 3.14, but I
> > > see patch 1 is a good one to have, so I'll take that now, and queue the
> > > rest up for after 3.14-rc1 is out for 3.15.  Is that ok with you, or do
> > > you have patches that depend on this series for 3.14?
> > 
> > Oh nevermind, these are all good, now applied :)
> 
> I don't have anything depending on the series for the up coming merge
> window so 3.15 merge window would have been fine but 3.14 merge
> windows wokrs too. :)

Greg, I'm sorry but can you please revert the whole series?
get_active() waiting while a node is deactivated has potential to lead
to deadlock and that deactivate/reactivate interface is something
fundamentally flawed and that cgroup will have to work with the
remove_self() like everybody else.  IOW, I think the first posting was
correct.

I think we better defer this to the next window and I'll do the whole
thing - kernfs updates & cgroup conversion - together and then push
out patches so that I don't repeat these mistakes.

Sorry about the mess.  I got tunnel-visioned thinking about cgroup
semantics too much.

Thank you.

-- 
tejun
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