linux-kernel - Re: [PATCH 2/3] percpu counter: cast this_cpu

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Date:	Sun, 27 Oct 2013 09:00:36 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Greg Thelen <gthelen@...gle.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	handai.szj@...bao.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/3] percpu counter: cast this_cpu_sub() adjustment

On Sun, Oct 27, 2013 at 05:04:29AM -0700, Andrew Morton wrote:
> On Sun, 27 Oct 2013 07:22:55 -0400 Tejun Heo <tj@...nel.org> wrote:
> 
> > We probably want to cc stable for this and the next one.  How should
> > these be routed?  I can take these through percpu tree or mm works
> > too.  Either way, it'd be best to route them together.
> 
> Yes, all three look like -stable material to me.  I'll grab them later
> in the week if you haven't ;)

Tried to apply to percpu but the third one is a fix for a patch which
was added to -mm during v3.12-rc1, so these are yours. :)

> The names of the first two patches distress me.  They rather clearly
> assert that the code affects percpu_counter.[ch], but that is not the case. 
> Massaging is needed to fix that up.

Yeah, something like the following would be better

 percpu: add test module for various percpu operations
 percpu: fix this_cpu_sub() subtrahend casting for unsigneds
 memcg: use __this_cpu_sub() to dec stats to avoid incorrect subtrahend casting

Thanks.

-- 
tejun
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