linux-kernel - [PATCH 2/9] mm, memory_hotplug: use node instead of zone in can_online_high

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Date:   Mon, 10 Apr 2017 13:03:44 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Yasuaki Ishimatsu <yasu.isimatu@...il.com>,
        qiuxishi@...wei.com, Kani Toshimitsu <toshi.kani@....com>,
        slaoub@...il.com, Joonsoo Kim <js1304@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH 2/9] mm, memory_hotplug: use node instead of zone in can_online_high_movable

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

the primary purpose of this helper is to query the node state so use
the node id directly. This is a preparatory patch for later changes.

This shouldn't introduce any functional change

Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 mm/memory_hotplug.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 9ed251811ec3..342332f29364 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -940,15 +940,15 @@ static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
  * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have
  * normal memory.
  */
-static bool can_online_high_movable(struct zone *zone)
+static bool can_online_high_movable(int nid)
 {
 	return true;
 }
 #else /* CONFIG_MOVABLE_NODE */
 /* ensure every online node has NORMAL memory */
-static bool can_online_high_movable(struct zone *zone)
+static bool can_online_high_movable(int nid)
 {
-	return node_state(zone_to_nid(zone), N_NORMAL_MEMORY);
+	return node_state(nid, N_NORMAL_MEMORY);
 }
 #endif /* CONFIG_MOVABLE_NODE */
 
@@ -1082,7 +1082,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
 
 	if ((zone_idx(zone) > ZONE_NORMAL ||
 	    online_type == MMOP_ONLINE_MOVABLE) &&
-	    !can_online_high_movable(zone))
+	    !can_online_high_movable(pfn_to_nid(pfn)))
 		return -EINVAL;
 
 	if (online_type == MMOP_ONLINE_KERNEL) {
-- 
2.11.0