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Date:	Fri, 25 Sep 2015 09:49:09 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Theodore Ts'o <tytso@....edu>, axboe@...nel.dk,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	lizefan@...wei.com, cgroups@...r.kernel.org, hannes@...xchg.org,
	kernel-team@...com, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>
Subject: Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable
 cgroup writeback on traditional hierarchies

On Thu, 2015-09-24 at 16:45 -0400, Tejun Heo wrote:
> Hello, Artem.
> 
> On Thu, Sep 24, 2015 at 11:09:46AM +0300, Artem Bityutskiy wrote:
> > On Wed, 2015-09-23 at 17:07 -0400, Tejun Heo wrote:
> > > So, this should make the regression go away.  It doesn't fix the
> > > underlying bugs but they shouldn't get triggered by people not
> > > experimenting with cgroup.
> > 
> > this hits the nail on the head and makes the problem go away.
> 
> Yeah but there still is an underlying problem here.  I've been going
> through the sync path today but can't trigger or spot anything wrong.
> Can you please apply the patch at the end of this mail, trigger the
> failure and report the kernel log?
> 
> Thanks a lot.

Does not compile with multiple errors like

linux/fs/fs-writeback.c:799:10: error: ‘struct bdi_writeback’ has no member named ‘last_comp_gen’
   bdi->wb.last_comp_gen = bdi->wb.comp_gen;
          ^



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