[PATCH] memcg: do not recalculate section unnecessarily ininit_section_page_cgroup

[Fernando Luis Vázquez Cao]

Signed-off-by: Fernando Luis Vazquez Cao <fernando@xxxxxxxxxxxxx>
---

diff -urNp linux-2.6.28-rc2-mm1-orig/mm/page_cgroup.c linux-2.6.28-rc2-mm1/mm/page_cgroup.c
--- linux-2.6.28-rc2-mm1-orig/mm/page_cgroup.c	2008-10-30 12:49:27.000000000 +0900
+++ linux-2.6.28-rc2-mm1/mm/page_cgroup.c	2008-10-30 12:52:41.000000000 +0900
@@ -99,13 +99,11 @@ struct page_cgroup *lookup_page_cgroup(s
 
 int __meminit init_section_page_cgroup(unsigned long pfn)
 {
-	struct mem_section *section;
+	struct mem_section *section = __pfn_to_section(pfn);
 	struct page_cgroup *base, *pc;
 	unsigned long table_size;
 	int nid, index;
 
-	section = __pfn_to_section(pfn);
-
 	if (section->page_cgroup)
 		return 0;
 
@@ -131,7 +129,6 @@ int __meminit init_section_page_cgroup(u
 		__init_page_cgroup(pc, pfn + index);
 	}
 
-	section = __pfn_to_section(pfn);
 	section->page_cgroup = base - pfn;
 	total_usage += table_size;
 	return 0;


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