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    Subject[PATCH 05/11] memcg: add null check to page_cgroup_zoneinfo()
    Date
    if CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y, page_cgroup::mem_cgroup can be NULL.
    Therefore null checking is better.

    latter patch use this function.


    Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    ---
    mm/memcontrol.c | 3 +++
    1 file changed, 3 insertions(+)

    Index: b/mm/memcontrol.c
    ===================================================================
    --- a/mm/memcontrol.c
    +++ b/mm/memcontrol.c
    @@ -231,6 +231,9 @@ page_cgroup_zoneinfo(struct page_cgroup
    int nid = page_cgroup_nid(pc);
    int zid = page_cgroup_zid(pc);

    + if (!mem)
    + return NULL;
    +
    return mem_cgroup_zoneinfo(mem, nid, zid);
    }




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