linux-kernel - Re: [PATCH][BUGFIX] memcg: fix page

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Date:	Wed, 22 Oct 2008 09:42:41 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH][BUGFIX] memcg: fix page_cgroup allocation

>> --- linux-2.6.orig/mm/page_cgroup.c
>> +++ linux-2.6/mm/page_cgroup.c
>> @@ -4,7 +4,12 @@
>>  #include <linux/bit_spinlock.h>
>>  #include <linux/page_cgroup.h>
>>  #include <linux/hash.h>
>> +#include <linux/slab.h>
>>  #include <linux/memory.h>
>> +#include <linux/cgroup.h>
>> +
>> +extern struct cgroup_subsys	mem_cgroup_subsys;
> 
> no no bad! evil! unclean!
> 
> Didn't the linux/cgroup.h -> linux/cgroup_subsys..h inclusion already
> declare this for us?
> 

Yes, I think just include <linux/cgroup.h> is enough.

#define SUBSYS(_x) extern struct cgroup_subsys _x ## _subsys;
#include <linux/cgroup_subsys.h>
#undef SUBSYS

and will be expanded to:

extern struct cgroup_subsys cpu_subsys;
extern struct cgroup_subsys cpuset_subsys;
extern struct cgroup_subsys memory_cgroup_subsys;
...

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