linux-kernel - [PATCH 5/9] mm, memory_hotplug: remove explicit build_all_zonelists from try_online

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Message-Id: <20170721143915.14161-6-mhocko@kernel.org>
Date:   Fri, 21 Jul 2017 16:39:11 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Mel Gorman <mgorman@...e.de>, Johannes Weiner <hannes@...xchg.org>,
        Vlastimil Babka <vbabka@...e.cz>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>, Toshi Kani <toshi.kani@....com>
Subject: [PATCH 5/9] mm, memory_hotplug: remove explicit build_all_zonelists from try_online_node

From: Michal Hocko <mhocko@...e.com>

try_online_node calls hotadd_new_pgdat which already calls
build_all_zonelists. So the additional call is redundant.  Even though
hotadd_new_pgdat will only initialize zonelists of the new node this is
the right thing to do because such a node doesn't have any memory so
other zonelists would ignore all the zones from this node anyway.

Cc: Toshi Kani <toshi.kani@....com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 mm/memory_hotplug.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 639b8af37c45..0d2f6a11075c 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1104,13 +1104,6 @@ int try_online_node(int nid)
 	node_set_online(nid);
 	ret = register_one_node(nid);
 	BUG_ON(ret);
-
-	if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
-		mutex_lock(&zonelists_mutex);
-		build_all_zonelists(NULL);
-		mutex_unlock(&zonelists_mutex);
-	}
-
 out:
 	mem_hotplug_done();
 	return ret;
-- 
2.11.0