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    Subject[PATCH] memcg: use ifdef for mem_cgroup_is_obsolete()
    From: Pekka Enberg <penberg@cs.helsinki.fi>

    When CONFIG_DEBUG_VM is disabled, I get the following warning:

    CC mm/memcontrol.o
    mm/memcontrol.c:318: warning: ‘mem_cgroup_is_obsolete’ defined but not
    used

    Fix that up by wrapping mem_cgroup_is_obsolete() in an ifdef.

    Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
    ---
    mm/memcontrol.c | 2 ++
    1 files changed, 2 insertions(+), 0 deletions(-)

    diff --git a/mm/memcontrol.c b/mm/memcontrol.c
    index 01c2d8f..51f2dbd 100644
    --- a/mm/memcontrol.c
    +++ b/mm/memcontrol.c
    @@ -314,12 +314,14 @@ static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
    return mem;
    }

    +#ifdef CONFIG_DEBUG_VM
    static bool mem_cgroup_is_obsolete(struct mem_cgroup *mem)
    {
    if (!mem)
    return true;
    return css_is_removed(&mem->css);
    }
    +#endif


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