linux-kernel - Re: [PATCH 6/9] cgroup_freezer: make freezer->state mask of flags

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Date:	Thu, 08 Nov 2012 14:00:34 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	lizefan@...wei.com, mhocko@...e.cz, rjw@...k.pl,
	linux-pm@...r.kernel.org, fweisbec@...il.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH 6/9] cgroup_freezer: make freezer->state mask of flags

(2012/11/08 13:42), Tejun Heo wrote:
> Hello, Kame.
>
> On Thu, Nov 08, 2012 at 01:37:50PM +0900, Kamezawa Hiroyuki wrote:
>> How about
>> enum {
>>     __CGROUP_FREEZING,
>>     __CGROUP_FROZEN,
>> };
>>
>> #define CGROUP_FREEZER_STATE_MASK  0x3
>> #define CGROUP_FREEZER_STATE(state)	((state) & CGROUP_FREEZER_STATE_MASK)
>> #define CGROUP_THAW(state)	(CGROUP_FREEZER_STATE(state) == 0)
>> #define CGROUP_FREEZING(state)	(CGROUP_FREEZER_STATE(state) == __CGROUP_FREEZING)
>> #define CGROUP_FROZEN(state)\
>> 	(CGROUP_FREEZER_STATE(state) == (__CGROUP_FREEZING | __CGROUP_FROZEN))
>
> I think it's a bit overdone and we have cases where we test for
> FREEZING regardless of FROZEN and cases where test for FREEZING &&
> !FROZEN.  We can have, say, CGROUP_FREZING() and then
> CGROUP_FREEZING_BUT_NOT_FROZEN(), but it feels more like obfuscation
> than anything else.
>

Hm, then, I'm glad if I can see what combinations of flags are valid and
meanings of them in source code comments.

Anyway,
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


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