linux-kernel - Re: [PATCH v3 1/6] memcg: fix error code in hugetlb_force_memcg

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Message-Id: <20120511141754.e0719c26.akpm@linux-foundation.org>
Date:	Fri, 11 May 2012 14:17:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Han Ying <yinghan@...gle.com>,
	Glauber Costa <glommer@...allels.com>,
	Tejun Heo <tj@...nel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/6] memcg: fix error code in
 hugetlb_force_memcg_empty()

On Fri, 11 May 2012 18:45:18 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> The conditions are handled as -EBUSY, _now_.

The changelog is poor.  I rewrote it to

: hugetlb_force_memcg_empty() incorrectly returns 0 (success) when the
: cgroup is found to be busy.  Return -EBUSY instead.

But it still doesn't tell us the end-user-visible effects of the bug. 
It should.

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