linux-kernel - [PATCH resend 2/2] mm,memory_hotplug: Drop redundant hugepage_migration

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Message-Id: <20190320152658.10855-3-osalvador@suse.de>
Date:   Wed, 20 Mar 2019 16:26:58 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     akpm@...ux-foundation.org
Cc:     mhocko@...e.com, david@...hat.com, mike.kravetz@...cle.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Oscar Salvador <osalvador@...e.de>
Subject: [PATCH resend 2/2] mm,memory_hotplug: Drop redundant hugepage_migration_supported check

has_unmovable_pages() does alreay check whether the hugetlb page supports
migration, so all non-migrateable hugetlb pages should have been caught there.
Let us drop the check from scan_movable_pages() as is redundant.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
Acked-by: Michal Hocko <mhocko@...e.com>
Reviewed-by: David Hildenbrand <david@...hat.com>
---
 mm/memory_hotplug.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 02283732544e..37a83a83e8f8 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1340,8 +1340,7 @@ static unsigned long scan_movable_pages(unsigned long start, unsigned long end)
 		if (!PageHuge(page))
 			continue;
 		head = compound_head(page);
-		if (hugepage_migration_supported(page_hstate(head)) &&
-		    page_huge_active(head))
+		if (page_huge_active(head))
 			return pfn;
 		skip = (1 << compound_order(head)) - (page - head);
 		pfn += skip - 1;
-- 
2.13.7