linux-kernel - Re: [PATCH] mm/memcg: wrap mem_cgroup_from

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Date:	Thu, 19 Jul 2012 12:45:54 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Gavin Shan <shangw@...ux.vnet.ibm.com>
Cc:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWAHiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/memcg: wrap mem_cgroup_from_css function

On Thu, Jul 19, 2012 at 05:38:35PM +0800, Gavin Shan wrote:
> On Thu, Jul 19, 2012 at 05:23:09PM +0800, Wanpeng Li wrote:
> >On Thu, Jul 19, 2012 at 12:14:20PM +0300, Kirill A. Shutemov wrote:
> >>On Wed, Jul 18, 2012 at 11:05:30AM +0800, Wanpeng Li wrote:
> >>> wrap mem_cgroup_from_css function to clarify get mem cgroup
> >>> from cgroup_subsys_state.
> >>> 
> >>> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
> >>> Cc: Michal Hocko <mhocko@...e.cz>
> >>> Cc: Johannes Weiner <hannes@...xchg.org>
> >>> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> >>> Cc: Andrew Morton <akpm@...ux-foundation.org>
> >>> Cc: Gavin Shan <shangw@...ux.vnet.ibm.com>
> >>> Cc: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
> >>> Cc: linux-kernel@...r.kernel.org
> >>> ---
> >>>  mm/memcontrol.c |   14 ++++++++++----
> >>>  1 files changed, 10 insertions(+), 4 deletions(-)
> >>> 
> >>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> >>> index 58a08fc..20f6a15 100644
> >>> --- a/mm/memcontrol.c
> >>> +++ b/mm/memcontrol.c
> >>> @@ -396,6 +396,12 @@ static void mem_cgroup_put(struct mem_cgroup *memcg);
> >>>  #include <net/sock.h>
> >>>  #include <net/ip.h>
> >>>  
> >>> +static inline
> >>> +struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *s)
> >>> +{
> >>> +	return container_of(s, struct mem_cgroup, css);
> >>> +}
> >>> +
> >>>  static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
> >>>  void sock_update_memcg(struct sock *sk)
> >>>  {
> >>> @@ -820,7 +826,7 @@ static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
> >>>  
> >>>  struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
> >>>  {
> >>> -	return container_of(cgroup_subsys_state(cont,
> >>> +	return mem_cgroup_from_css(cgroup_subsys_state(cont,
> >>>  				mem_cgroup_subsys_id), struct mem_cgroup,
> >>>  				css);
> >>
> >>Hm?.. Here and below too many args to mem_cgroup_from_css().
> >>Have you tested the code?
> >
> >Hi, what's the meaning of "two many"?
> >
> 
> It might be the typo for "two" here.

Oops.. You're right.

-- 
 Kirill A. Shutemov
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