[BUGFIX][PATCH] memcg: memory hotplug fix

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

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@jp.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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