[PATCH] cgroup: Fix uninitialized variable warning

From: Ross Zwisler
Date: Wed Dec 23 2015 - 16:54:32 EST


Commit 1f7dd3e5a6e4 ("cgroup: fix handling of multi-destination migration
from subtree_control enabling") introduced the following compiler warning:

mm/memcontrol.c: In function âmem_cgroup_can_attachâ:
mm/memcontrol.c:4790:9: warning: âmemcgâ may be used uninitialized in this function [-Wmaybe-uninitialized]
mc.to = memcg;
^

Fix this by initializing 'memcg' to NULL.

This was found using gcc (GCC) 4.9.2 20150212 (Red Hat 4.9.2-6).

Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 48b22c3..ffd9750 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4735,7 +4735,7 @@ static void mem_cgroup_clear_mc(void)
static int mem_cgroup_can_attach(struct cgroup_taskset *tset)
{
struct cgroup_subsys_state *css;
- struct mem_cgroup *memcg;
+ struct mem_cgroup *memcg = NULL; /* unneeded init to make gcc happy */
struct mem_cgroup *from;
struct task_struct *leader, *p;
struct mm_struct *mm;
--
2.6.3

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