mm: memcontrol: let mem_cgroup_move_account() have effect only if MMU enabled
When !MMU, it will report warning. The related warning with allmodconfig under c6x: CC mm/memcontrol.o mm/memcontrol.c:2802:12: warning: 'mem_cgroup_move_account' defined but not used [-Wunused-function] static int mem_cgroup_move_account(struct page *page, ^ Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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