linux-kernel - [BUGFIX][PATCH] memcg: memory hotplug fix

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Message-Id: <20081110183839.e551a52e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 10 Nov 2008 18:38:39 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>, pbadari@...ibm.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: [BUGFIX][PATCH] memcg: memory hotplug fix

This is a bug fix reported against 2.6.28-rc3 from Badari.
Badari, could you give me Ack or Tested-by ?

Thanks,
-Kame
==
start pfn calculation of page_cgroup's memory hotplug notifier chain
is wrong.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


 mm/page_cgroup.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: mmotm-2.6.28-Oct30/mm/page_cgroup.c
===================================================================
--- mmotm-2.6.28-Oct30.orig/mm/page_cgroup.c
+++ mmotm-2.6.28-Oct30/mm/page_cgroup.c
@@ -165,7 +165,7 @@ int online_page_cgroup(unsigned long sta
 	unsigned long start, end, pfn;
 	int fail = 0;
 
-	start = start_pfn & (PAGES_PER_SECTION - 1);
+	start = start_pfn & ~(PAGES_PER_SECTION - 1);
 	end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
 
 	for (pfn = start; !fail && pfn < end; pfn += PAGES_PER_SECTION) {
@@ -188,7 +188,7 @@ int offline_page_cgroup(unsigned long st
 {
 	unsigned long start, end, pfn;
 
-	start = start_pfn & (PAGES_PER_SECTION - 1);
+	start = start_pfn & ~(PAGES_PER_SECTION - 1);
 	end = ALIGN(start_pfn + nr_pages, PAGES_PER_SECTION);
 
 	for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION)

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