linux-kernel - Re: [PATCH] Fix build warning and avoid checking for mem != null twice

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Date:	Tue, 26 May 2009 20:02:00 +0530
From:	Nikanth Karthikesan <knikanth@...e.de>
To:	balbir@...ux.vnet.ibm.com
Cc:	Pavel Emelyanov <xemul@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH] Fix build warning and avoid checking for mem != null twice

On Tuesday 26 May 2009 19:00:50 Balbir Singh wrote:
> * Nikanth Karthikesan <knikanth@...e.de> [2009-05-26 18:44:32]:
> > Fix build warning, "mem_cgroup_is_obsolete defined but not used" when
> > CONFIG_DEBUG_VM is not set. Also avoid checking for !mem twice.
> >
> > Signed-off-by: Nikanth Karthikesan <knikanth@...e.de>
>
> I thought we fixed this, could you check the latest mmotm please!

I am unable to find this in mmotm. Also the !mem check can be avoided even in
the VM_BUG_ON as we check for it just before that. If it is not fixed already,
please take this else ignore.

Thanks
Nikanth

Fix build warning, "mem_cgroup_is_obsolete defined but not used" when
CONFIG_DEBUG_VM is not set. Also avoid checking for !mem again and again.

Signed-off-by: Nikanth Karthikesan <knikanth@...e.de>
Acked-by: Pekka Enberg <penberg@...helsinki.fi>

---

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 01c2d8f..d253846 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -314,14 +314,6 @@ static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
 	return mem;
 }
 
-static bool mem_cgroup_is_obsolete(struct mem_cgroup *mem)
-{
-	if (!mem)
-		return true;
-	return css_is_removed(&mem->css);
-}
-
-
 /*
  * Call callback function against all cgroup under hierarchy tree.
  */
@@ -932,7 +924,7 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
 	if (unlikely(!mem))
 		return 0;
 
-	VM_BUG_ON(!mem || mem_cgroup_is_obsolete(mem));
+	VM_BUG_ON(css_is_removed(&mem->css));
 
 	while (1) {
 		int ret;

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