memory_hotplug: drop spurious calls to flush_scheduled_work()

lru_add_drain_all() uses schedule_on_each_cpu() which is synchronous.
There is no reason to call flush_scheduled_work() after
lru_add_drain_all().  Drop the spurious calls.

This is to prepare for the deprecation and removal of
flush_scheduled_work().

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>

1 files changed, 0 insertions, 2 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index dd186c1a5d53..d4e940a26945 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -840,7 +840,6 @@ repeat:
         ret = 0;
         if (drain) {
                 lru_add_drain_all();
-                flush_scheduled_work();
                 cond_resched();
                 drain_all_pages();
         }
@@ -862,7 +861,6 @@ repeat:
         }
         /* drain all zone's lru pagevec, this is asyncronous... */
         lru_add_drain_all();
-        flush_scheduled_work();
         yield();
         /* drain pcp pages , this is synchrouns. */
         drain_all_pages();