linux-kernel - Re: [PATCH -mmotm] build fix for memcg-move-charges-of-anonymous-swap.patch

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Date:	Thu, 7 Jan 2010 14:07:58 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH -mmotm] build fix for
 memcg-move-charges-of-anonymous-swap.patch

On Thu, 7 Jan 2010 13:30:26 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Thu, 7 Jan 2010 13:06:09 +0900
> Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:
> 
> > build fix in !CONFIG_SWAP case.
> > 
> >   CC      mm/memcontrol.o
> > mm/memcontrol.c: In function 'is_target_pte_for_mc':
> > mm/memcontrol.c:3648: error: implicit declaration of function 'mem_cgroup_count_swap_user'
> > make[1]: *** [mm/memcontrol.o] Error 1
> > make: *** [mm] Error 2
> > 
> > Reported-by: Randy Dunlap <randy.dunlap@...cle.com>
> > Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > Signed-off-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
> 
> Hmm, this doesn't seem include fix for CONFIG_CGROUP_MEM_RES_CTLR_SWAP=n
> ==
> static int is_target_pte_for_mc(struct vm_area_struct *vma,
>                 unsigned long addr, pte_t ptent, union mc_target *target)
> {
> ....
>                 else if (is_swap_pte(ptent)) {
>                         ent = pte_to_swp_entry(ptent);
>                         if (!move_anon || non_swap_entry(ent))
>                                 return 0;
>                         usage_count = mem_cgroup_count_swap_user(ent, &page);
>                 }
> ==
> At least, !do_swap_account check is necessary, I think.
> I'm sorry if I miss something...
> 

Get follwoing after this patch with !CONFIG_SWAP case.
==
mm/built-in.o: In function `is_target_pte_for_mc':
/home/kamezawa/Kernel/ref-mmotm/mm/memcontrol.c:3985: undefined reference to `mem_cgroup_count_swap_user'


I think !do_swap_count check in is_target_pte_for_mc() should be added.

Thanks,
-Kame


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