Re: [BUGFIX][PATCH -mm] fix bad call of memcg_oom_recover at cancel move.

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Fri, 18 Jun 2010 10:57:41 +0900
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:

> > May I recommend the following change instead
> > 
> > 
> > Don't crash on a null memcg being passed, check if memcg
> > is NULL and handle the condition gracefully
> > 
> > Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
> > ---
> >  mm/memcontrol.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > index c6ece0a..d71c488 100644
> > --- a/mm/memcontrol.c
> > +++ b/mm/memcontrol.c
> > @@ -1370,7 +1370,7 @@ static void memcg_wakeup_oom(struct mem_cgroup *mem)
> >  
> >  static void memcg_oom_recover(struct mem_cgroup *mem)
> >  {
> > -	if (mem->oom_kill_disable && atomic_read(&mem->oom_lock))
> > +	if (mem && mem->oom_kill_disable && atomic_read(&mem->oom_lock))
> >  		memcg_wakeup_oom(mem);
> >  }
> >  
> I agree to this fix.
> 
> Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
> 

I tend to dislike band-aid in callee. but it's not important here.

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>




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