linux-kernel - Re: [PATCH 2/8] memcg: get rid of mem_cgroup_root_css for !CONFIG

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Message-ID: <20150708154111.GB2436@esperanza>
Date:	Wed, 8 Jul 2015 18:41:12 +0300
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Michal Hocko <mhocko@...nel.org>
CC:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Greg Thelen <gthelen@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	<linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/8] memcg: get rid of mem_cgroup_root_css for
 !CONFIG_MEMCG

On Wed, Jul 08, 2015 at 02:27:46PM +0200, Michal Hocko wrote:
> The only user is cgwb_bdi_init and that one depends on
> CONFIG_CGROUP_WRITEBACK which in turn depends on CONFIG_MEMCG
> so it doesn't make much sense to definte an empty stub for
> !CONFIG_MEMCG. Moreover ERR_PTR(-EINVAL) is ugly and would lead
> to runtime crashes if used in unguarded code paths. Better fail
> during compilation.
> 
> Signed-off-by: Michal Hocko <mhocko@...nel.org>

Reviewed-by: Vladimir Davydov <vdavydov@...allels.com>
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