From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH] cgroup: Fix uninitialized variable warning
Date: Mon, 28 Dec 2015 10:45:03 -0500
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References: <1450907607-5060-1-git-send-email-ross.zwisler@linux.intel.com>
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To: Ross Zwisler <ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Cc: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>, Daniel Wagner <daniel.wagner-98C5kh4wR6ohFhg+JK9F0w@public.gmane.org>, Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Dave Jones <davej-rdkfGonbjUTCLXcRTR1eJlpr/1R2p/CL@public.gmane.org>, kernel-team-b10kYP2dOMg@public.gmane.org, Aleksa Sarai <cyphar-gVpy/LI/lHzQT0dZR+AlfA@public.gmane.org>, Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Ingo Molnar <mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, Neil Horman <nhorman-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org>

On Wed, Dec 23, 2015 at 02:53:27PM -0700, Ross Zwisler wrote:
> Commit 1f7dd3e5a6e4 ("cgroup: fix handling of multi-destination migra=
tion
> from subtree_control enabling") introduced the following compiler war=
ning:
>=20
> mm/memcontrol.c: In function =E2=80=98mem_cgroup_can_attach=E2=80=99:
> mm/memcontrol.c:4790:9: warning: =E2=80=98memcg=E2=80=99 may be used =
uninitialized in this function [-Wmaybe-uninitialized]
>    mc.to =3D memcg;
>          ^
>=20
> Fix this by initializing 'memcg' to NULL.
>=20
> This was found using gcc (GCC) 4.9.2 20150212 (Red Hat 4.9.2-6).
>=20
> Signed-off-by: Ross Zwisler <ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

Applied to cgroup/for-4.5.

Thanks.

--=20
tejun