[PATCH 14/25] mm/fbatch: no lru_add_drain() nor _all() for memfd_wait_for_pins()

[Hugh Dickins]

memfd_tag_pins() used lru_add_drain(), memfd_wait_for_pins() then used
lru_add_drain_all(): remove those calls, no longer useful now that the
per-cpu fbatch references are gone.

Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
---
 mm/memfd.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/mm/memfd.c b/mm/memfd.c
index c708d92533f4..064f24dcddaa 100644
--- a/mm/memfd.c
+++ b/mm/memfd.c
@@ -40,8 +40,6 @@ static void memfd_tag_pins(struct xa_state *xas)
 	struct folio *folio;
 	int latency = 0;
 
-	lru_add_drain();
-
 	xas_lock_irq(xas);
 	xas_for_each(xas, folio, ULONG_MAX) {
 		if (!xa_is_value(folio) && memfd_folio_has_extra_refs(folio))
@@ -168,9 +166,7 @@ static int memfd_wait_for_pins(struct address_space *mapping)
 		if (!xas_marked(&xas, MEMFD_TAG_PINNED))
 			break;
 
-		if (!scan)
-			lru_add_drain_all();
-		else if (schedule_timeout_killable((HZ << scan) / 200))
+		if (scan && schedule_timeout_killable((HZ << scan) / 200))
 			scan = LAST_SCAN;
 
 		xas_set(&xas, 0);
-- 
2.51.0