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From: Catalin Marinas on 15 Jul 2010 11:10
The pointer to the page_cgroup table allocated in
init_section_page_cgroup() is stored in section->page_cgroup as (base -
pfn). Since this value does not point to the beginning or inside the
allocated memory block, kmemleak reports a false positive.

Signed-off-by: Catalin Marinas <catalin.marinas(a)arm.com>
Reported-by: Adrien Dessemond <adrien.dessemond(a)gmail.com>
Cc: Pekka Enberg <penberg(a)cs.helsinki.fi>
Cc: Andrew Morton <akpm(a)linux-foundation.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu(a)jp.fujitsu.com>
---
mm/page_cgroup.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 6c00814..5bffada 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -9,6 +9,7 @@
#include <linux/vmalloc.h>
#include <linux/cgroup.h>
#include <linux/swapops.h>
+#include <linux/kmemleak.h>

static void __meminit
__init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
@@ -126,6 +127,12 @@ static int __init_refok init_section_page_cgroup(unsigned long pfn)
if (!base)
base = vmalloc(table_size);
}
+ /*
+ * The value stored in section->page_cgroup is (base - pfn)
+ * and it does not point to the memory block allocated above,
+ * causing kmemleak false positives.
+ */
+ kmemleak_not_leak(base);
} else {
/*
* We don't have to allocate page_cgroup again, but

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