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I've noticed that __memcg_kmem_charge() and __memcg_kmem_uncharge() are
not used anywhere except memcontrol.c.  Yet they are not declared as
non-static and are declared in memcontrol.h.

This patch makes them static.

Link: https://lkml.kernel.org/r/20210108020332.4096911-1-guro@fb.com

Signed-off-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>