On Wed, Dec 23, 2015 at 04:35:19PM -0500, Tejun Heo wrote:
> Hello, Ross.
>
> On Wed, Dec 23, 2015 at 02:30:40PM -0700, Ross Zwisler wrote:
> > static int mem_cgroup_can_attach(struct cgroup_taskset *tset)
> > {
> > struct cgroup_subsys_state *css;
> > - struct mem_cgroup *memcg;
> > + struct mem_cgroup *memcg = NULL;
>
> It's one thing to add spurious init to shut up gcc
>
> > @@ -4805,7 +4805,7 @@ static int mem_cgroup_can_attach(struct
> > cgroup_taskset *tset)
> > p = leader;
> > memcg = mem_cgroup_from_css(css);
> > }
> > - if (!p)
> > + if (!p || !memcg)
>
> and to another to add an additional processing on it.
Do you believe that the additional processing is incorrect? If somehow we
*do* get through the above loop without setting memcg, the next deref will
OOPs the kernel...
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