linux-kernel - [PATCH v2 3/5] mm, memory hotplug: small cleanup in online

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Date:	Mon,  8 Feb 2016 14:38:09 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Mel Gorman <mgorman@...hsingularity.net>,
	David Rientjes <rientjes@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH v2 3/5] mm, memory hotplug: small cleanup in online_pages()

We can reuse the nid we've determined instead of repeated pfn_to_nid() usages.
Also zone_to_nid() should be a bit cheaper in general than pfn_to_nid().

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/memory_hotplug.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 7aa7697fedd1..66064008a489 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1082,7 +1082,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
 	arg.nr_pages = nr_pages;
 	node_states_check_changes_online(nr_pages, zone, &arg);
 
-	nid = pfn_to_nid(pfn);
+	nid = zone_to_nid(zone);
 
 	ret = memory_notify(MEM_GOING_ONLINE, &arg);
 	ret = notifier_to_errno(ret);
@@ -1122,7 +1122,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
 	pgdat_resize_unlock(zone->zone_pgdat, &flags);
 
 	if (onlined_pages) {
-		node_states_set_node(zone_to_nid(zone), &arg);
+		node_states_set_node(nid, &arg);
 		if (need_zonelists_rebuild)
 			build_all_zonelists(NULL, NULL);
 		else
@@ -1134,7 +1134,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
 	init_per_zone_wmark_min();
 
 	if (onlined_pages) {
-		kswapd_run(zone_to_nid(zone));
+		kswapd_run(nid);
 		kcompactd_run(nid);
 	}
 
-- 
2.7.0