memcg: make __mod_memcg_lruvec_state re-entrant safe against irqs

Let's make __mod_memcg_lruvec_state re-entrant safe and name it
mod_memcg_lruvec_state().  The only thing needed is to convert the usage
of __this_cpu_add() to this_cpu_add().  There are two callers of
mod_memcg_lruvec_state() and one of them i.e.  __mod_objcg_mlstate() will
be re-entrant safe as well, so, rename it mod_objcg_mlstate().  The last
caller __mod_lruvec_state() still calls __mod_node_page_state() which is
not re-entrant safe yet, so keep it as is.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Shakeel Butt <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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