linux-kernel - [PATCH 2/4] mm: duplicate rmap reference for hugetlb pages as compound

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Date:	Tue,  3 Nov 2015 17:26:13 +0200
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 2/4] mm: duplicate rmap reference for hugetlb pages as compound

Naoya noticed that I wrongly duplicate rmap reference for hugetlb pages
in remove_migration_pte() as non-compound. Let's fix this.

The patch can be folded into
	"mm: rework mapcount accounting to enable 4k mapping of THPs"

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Reported-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---
 mm/migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 1ae0113559c9..b1034f9c77e7 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -165,7 +165,7 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
 		if (PageAnon(new))
 			hugepage_add_anon_rmap(new, vma, addr);
 		else
-			page_dup_rmap(new, false);
+			page_dup_rmap(new, true);
 	} else if (PageAnon(new))
 		page_add_anon_rmap(new, vma, addr, false);
 	else
-- 
2.6.1

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