[patch 014/166] mm/migrate.c: check pagelist in move_pages_and_store_status()

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From: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Subject: mm/migrate.c: check pagelist in move_pages_and_store_status()

When pagelist is empty, it is not necessary to do the move and store. 
Also it consolidate the empty list check in one place.

Link: http://lkml.kernel.org/r/20200214003017.25558-4-richardw.yang@xxxxxxxxxxxxxxx
Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/migrate.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

--- a/mm/migrate.c~mm-migratec-check-pagelist-in-move_pages_and_store_status
+++ a/mm/migrate.c
@@ -1518,9 +1518,6 @@ static int do_move_pages_to_node(struct
 {
 	int err;
 
-	if (list_empty(pagelist))
-		return 0;
-
 	err = migrate_pages(pagelist, alloc_new_node_page, NULL, node,
 			MIGRATE_SYNC, MR_SYSCALL);
 	if (err)
@@ -1608,6 +1605,9 @@ static int move_pages_and_store_status(s
 {
 	int err;
 
+	if (list_empty(pagelist))
+		return 0;
+
 	err = do_move_pages_to_node(mm, pagelist, node);
 	if (err) {
 		/*
@@ -1705,9 +1705,6 @@ static int do_pages_move(struct mm_struc
 		current_node = NUMA_NO_NODE;
 	}
 out_flush:
-	if (list_empty(&pagelist))
-		return err;
-
 	/* Make sure we do not overwrite the existing error */
 	err1 = move_pages_and_store_status(mm, current_node, &pagelist,
 				status, start, i, nr_pages);
_




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