include/linux/mm_inline.h: fold __update_lru_size() into its sole caller

All other references to the function were removed after commit
a892cb6 ("mm/vmscan.c: use update_lru_size() in update_lru_sizes()").

Link: https://lore.kernel.org/linux-mm/20201207220949.830352-10-yuzhao@google.com/
Link: https://lkml.kernel.org/r/20210122220600.906146-10-yuzhao@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/mm_inline.h

@@ -24,7 +24,7 @@ static inline int page_is_file_lru(struct page *page)
 	return !PageSwapBacked(page);
 }
 
-static __always_inline void __update_lru_size(struct lruvec *lruvec,
+static __always_inline void update_lru_size(struct lruvec *lruvec,
 				enum lru_list lru, enum zone_type zid,
 				int nr_pages)
 {
@@ -33,13 +33,6 @@ static __always_inline void __update_lru_size(struct lruvec *lruvec,
 	__mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
 	__mod_zone_page_state(&pgdat->node_zones[zid],
 				NR_ZONE_LRU_BASE + lru, nr_pages);
-}
-
-static __always_inline void update_lru_size(struct lruvec *lruvec,
-				enum lru_list lru, enum zone_type zid,
-				int nr_pages)
-{
-	__update_lru_size(lruvec, lru, zid, nr_pages);
 #ifdef CONFIG_MEMCG
 	mem_cgroup_update_lru_size(lruvec, lru, zid, nr_pages);
 #endif