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authorCatalin Marinas <catalin.marinas@arm.com>2010-07-19 11:54:14 +0100
committerCatalin Marinas <catalin.marinas@arm.com>2010-07-19 11:54:14 +0100
commit7952f98818d561ed0e11434a7a16acd9a7bae859 (patch)
treeb8e74d8a3aa9ac6939889487b8c46ce098c7d9f3 /mm
parent815c4163b6c8ebf8152f42b0a5fd015cfdcedc78 (diff)
downloadkernel-7952f98818d561ed0e11434a7a16acd9a7bae859.tar.gz
kmemleak: Annotate false positive in init_section_page_cgroup()
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. This was reported in bugzilla.kernel.org as #16297. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Adrien Dessemond <adrien.dessemond@gmail.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_cgroup.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 6c0081441a32..5bffada7cde1 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