linux-kernel - Re: mmotm: mm-slub-optimize-alloc-free-fastpath-by-removing-preemption-on-off.patch is causing preemptible splats

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Message-ID: <20150122015123.GB21444@js1304-P5Q-DELUXE>
Date:	Thu, 22 Jan 2015 10:51:23 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Krzysztof Kozłowski <k.kozlowski.k@...il.com>,
	Christoph Lameter <cl@...ux.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: mmotm:
 mm-slub-optimize-alloc-free-fastpath-by-removing-preemption-on-off.patch is
 causing preemptible splats

On Wed, Jan 21, 2015 at 02:21:07PM -0800, Andrew Morton wrote:
> On Wed, 21 Jan 2015 15:11:38 +0100 Michal Hocko <mhocko@...e.cz> wrote:
> 
> > On Wed 21-01-15 15:06:03, Krzysztof Koz__owski wrote:
> > [...]
> > > Same here :) [1] . So actually only ARM seems affected (both armv7 and
> > > armv8) because it is the only one which uses smp_processor_id() in
> > > my_cpu_offset.
> > 
> > This was on x86_64 with CONFIG_DEBUG_PREEMPT so it is not only ARM
> > specific.
> >  
> 
> Hopefully
> mm-slub-optimize-alloc-free-fastpath-by-removing-preemption-on-off-v3.patch
> will fix this.

Yes, it will fix this error.

> The most recent -mmotm was a bit of a trainwreck.  I'm scrambling to
> get the holes plugged so I can get another mmotm out today.

Another mmotm will fix many issues from me. :/

Thanks.

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