memcg: rename mem variable to memcg
The memcg code sometimes uses "struct mem_cgroup *mem" and sometimes uses "struct mem_cgroup *memcg". Rename all mem variables to memcg in source file. Signed-off-by: NRaghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Acked-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: NMichal Hocko <mhocko@suse.cz> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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