mm: memcontrol: quarantine the mem_cgroup_[node_]nr_lru_pages() API

Only memcg_numa_stat_show() uses those wrappers and the lru bitmasks,
group them together.

Link: http://lkml.kernel.org/r/20190228163020.24100-7-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Roman Gushchin <guro@fb.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/mmzone.h

@@ -247,11 +247,6 @@ struct lruvec {
 #endif
 };
 
-/* Mask used at gathering information at once (see memcontrol.c) */
-#define LRU_ALL_FILE (BIT(LRU_INACTIVE_FILE) | BIT(LRU_ACTIVE_FILE))
-#define LRU_ALL_ANON (BIT(LRU_INACTIVE_ANON) | BIT(LRU_ACTIVE_ANON))
-#define LRU_ALL	     ((1 << NR_LRU_LISTS) - 1)
-
 /* Isolate unmapped file */
 #define ISOLATE_UNMAPPED	((__force isolate_mode_t)0x2)
 /* Isolate for asynchronous migration */

mm/memcontrol.c

@@ -725,37 +725,6 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
 	__this_cpu_add(memcg->stat_cpu->nr_page_events, nr_pages);
 }
 
-static unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
-					   int nid, unsigned int lru_mask)
-{
-	struct lruvec *lruvec = mem_cgroup_lruvec(NODE_DATA(nid), memcg);
-	unsigned long nr = 0;
-	enum lru_list lru;
-
-	VM_BUG_ON((unsigned)nid >= nr_node_ids);
-
-	for_each_lru(lru) {
-		if (!(BIT(lru) & lru_mask))
-			continue;
-		nr += lruvec_page_state(lruvec, NR_LRU_BASE + lru);
-	}
-	return nr;
-}
-
-static unsigned long mem_cgroup_nr_lru_pages(struct mem_cgroup *memcg,
-			unsigned int lru_mask)
-{
-	unsigned long nr = 0;
-	enum lru_list lru;
-
-	for_each_lru(lru) {
-		if (!(BIT(lru) & lru_mask))
-			continue;
-		nr += memcg_page_state(memcg, NR_LRU_BASE + lru);
-	}
-	return nr;
-}
-
 static bool mem_cgroup_event_ratelimit(struct mem_cgroup *memcg,
 				       enum mem_cgroup_events_target target)
 {
@@ -3338,6 +3307,42 @@ static int mem_cgroup_move_charge_write(struct cgroup_subsys_state *css,
 #endif
 
 #ifdef CONFIG_NUMA
+
+#define LRU_ALL_FILE (BIT(LRU_INACTIVE_FILE) | BIT(LRU_ACTIVE_FILE))
+#define LRU_ALL_ANON (BIT(LRU_INACTIVE_ANON) | BIT(LRU_ACTIVE_ANON))
+#define LRU_ALL	     ((1 << NR_LRU_LISTS) - 1)
+
+static unsigned long mem_cgroup_node_nr_lru_pages(struct mem_cgroup *memcg,
+					   int nid, unsigned int lru_mask)
+{
+	struct lruvec *lruvec = mem_cgroup_lruvec(NODE_DATA(nid), memcg);
+	unsigned long nr = 0;
+	enum lru_list lru;
+
+	VM_BUG_ON((unsigned)nid >= nr_node_ids);
+
+	for_each_lru(lru) {
+		if (!(BIT(lru) & lru_mask))
+			continue;
+		nr += lruvec_page_state(lruvec, NR_LRU_BASE + lru);
+	}
+	return nr;
+}
+
+static unsigned long mem_cgroup_nr_lru_pages(struct mem_cgroup *memcg,
+					     unsigned int lru_mask)
+{
+	unsigned long nr = 0;
+	enum lru_list lru;
+
+	for_each_lru(lru) {
+		if (!(BIT(lru) & lru_mask))
+			continue;
+		nr += memcg_page_state(memcg, NR_LRU_BASE + lru);
+	}
+	return nr;
+}
+
 static int memcg_numa_stat_show(struct seq_file *m, void *v)
 {
 	struct numa_stat {