mm: vmscan: modify an easily misunderstood function name

When looking at the code in the memory part, I found that the purpose of
the function prepare_scan_countis very different from the function name. 
It is easy to misunderstand when reading.The function prepare_scan_count
mainly completes the assignment of the scan_control structure.Therefore, I
suggest that the function name can be changed to prepare_scan_control,
which is easier to understand.

Link: https://lkml.kernel.org/r/20230912085923.27238-1-liujinlong@kylinos.cnSigned-off-by: liujinlong <liujinlong@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/vmscan.c

@@ -2208,7 +2208,7 @@ enum scan_balance {
 	SCAN_FILE,
 };
 
-static void prepare_scan_count(pg_data_t *pgdat, struct scan_control *sc)
+static void prepare_scan_control(pg_data_t *pgdat, struct scan_control *sc)
 {
 	unsigned long file;
 	struct lruvec *target_lruvec;
@@ -5834,7 +5834,7 @@ static void shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 	nr_reclaimed = sc->nr_reclaimed;
 	nr_scanned = sc->nr_scanned;
 
-	prepare_scan_count(pgdat, sc);
+	prepare_scan_control(pgdat, sc);
 
 	shrink_node_memcgs(pgdat, sc);