[PATCH 22/25] fs/fbatch: drop_caches invalidate_bh_lrus() not lru_add_drain_all()

drop_caches has no good reason to lru_add_drain_all(), now that the
per-cpu fbatch references are gone; but it may have good reason to
do the invalidate_bh_lrus() part of it.

Signed-off-by: Hugh Dickins <[email protected]>
---
 fs/drop_caches.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 49f56a598ecb..054af78e6a2e 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -10,7 +10,7 @@
 #include <linux/writeback.h>
 #include <linux/sysctl.h>
 #include <linux/gfp.h>
-#include <linux/swap.h>
+#include <linux/buffer_head.h>
 #include "internal.h"
 
 /* A global variable is a bit ugly, but it keeps the code simple */
@@ -60,7 +60,7 @@ static int drop_caches_sysctl_handler(const struct ctl_table *table, int write,
 		static int stfu;
 
 		if (sysctl_drop_caches & 1) {
-			lru_add_drain_all();
+			invalidate_bh_lrus();
 			iterate_supers(drop_pagecache_sb, NULL);
 			count_vm_event(DROP_PAGECACHE);
 		}
-- 
2.51.0