linux-kernel - [PATCH v2.6.36-rc7] memory_hotplug: drop spurious calls to flush_scheduled

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Date:	Fri, 15 Oct 2010 17:25:15 +0200
From:	Tejun Heo <tj@...nel.org>
To:	lkml <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Michal Hocko <mhocko@...e.cz>
Subject: [PATCH v2.6.36-rc7] 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@...nel.org>
---
 mm/memory_hotplug.c |    2 --
 1 file changed, 2 deletions(-)

Index: work/mm/memory_hotplug.c
===================================================================
--- work.orig/mm/memory_hotplug.c
+++ work/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();
--
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