linux-kernel - [RESEND] [PATCH] memcg: Fix build warning and avoid checking for mem != null again and again

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Message-Id: <200905281420.44338.knikanth@suse.de>
Date:	Thu, 28 May 2009 14:20:43 +0530
From:	Nikanth Karthikesan <knikanth@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	balbir@...ux.vnet.ibm.com, 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: [RESEND] [PATCH] memcg: Fix build warning and avoid checking for mem != null again and again


Resending the patch to Andrew for inclusion in -mm tree.

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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