linux-kernel - [PATCH 1/1] mm/migrate: do not call prep_transhuge_page if !thp_migration

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Date:   Mon, 20 Nov 2017 16:17:56 +0000
From:   Andrea Reale <ar@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, zi.yan@...rutgers.edu,
        n-horiguchi@...jp.nec.com
Cc:     akpm@...ux-foundation.org, jglisse@...hat.com, realean2@...ibm.com
Subject: [PATCH 1/1] mm/migrate: do not call prep_transhuge_page if
 !thp_migration_supported

new_page_nodemask in linux/migrate.h should not call prep_transhuge_page
if thp_migration_support is false.

Fixes commit 8135d8926c08 ("mm: memory_hotplug: memory hotremove supports
thp migration")

Signed-off-by: Andrea Reale <ar@...ux.vnet.ibm.com>
---
 include/linux/migrate.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 895ec0c..725eac5 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -54,7 +54,7 @@ static inline struct page *new_page_nodemask(struct page *page,
 	new_page = __alloc_pages_nodemask(gfp_mask, order,
 				preferred_nid, nodemask);
 
-	if (new_page && PageTransHuge(page))
+	if (thp_migration_supported() && new_page && PageTransHuge(page))
 		prep_transhuge_page(new_page);
 
 	return new_page;
-- 
2.7.4