linux-kernel - [PATCH 3.2 036/221] mm/hugetlb: add migration entry check in __unmap_hugepage

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Date:	Tue, 05 May 2015 02:16:39 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Johannes Weiner" <hannes@...xchg.org>,
	"Luiz Capitulino" <lcapitulino@...hat.com>,
	"Michal Hocko" <mhocko@...e.cz>,
	"Nishanth Aravamudan" <nacc@...ux.vnet.ibm.com>,
	"Hugh Dickins" <hughd@...gle.com>,
	"Andrea Arcangeli" <aarcange@...hat.com>,
	"Steve Capper" <steve.capper@...aro.org>,
	"Naoya Horiguchi" <n-horiguchi@...jp.nec.com>,
	"Mel Gorman" <mel@....ul.ie>,
	"James Hogan" <james.hogan@...tec.com>,
	"Rik van Riel" <riel@...hat.com>,
	"David Rientjes" <rientjes@...gle.com>,
	"Lee Schermerhorn" <lee.schermerhorn@...com>
Subject: [PATCH 3.2 036/221] mm/hugetlb: add migration entry check in
 __unmap_hugepage_range

3.2.69-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

commit 9fbc1f635fd0bd28cb32550211bf095753ac637a upstream.

If __unmap_hugepage_range() tries to unmap the address range over which
hugepage migration is on the way, we get the wrong page because pte_page()
doesn't work for migration entries.  This patch simply clears the pte for
migration entries as we do for hwpoison entries.

Fixes: 290408d4a2 ("hugetlb: hugepage migration core")
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: James Hogan <james.hogan@...tec.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Mel Gorman <mel@....ul.ie>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Rik van Riel <riel@...hat.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Luiz Capitulino <lcapitulino@...hat.com>
Cc: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
Cc: Lee Schermerhorn <lee.schermerhorn@...com>
Cc: Steve Capper <steve.capper@...aro.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[bwh: Backported to 3.2: adjust context and comment, as we're checking after
 the PTE has been cleared]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 mm/hugetlb.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2418,9 +2418,10 @@ void __unmap_hugepage_range(struct vm_ar
 			continue;
 
 		/*
-		 * HWPoisoned hugepage is already unmapped and dropped reference
+		 * Migrating hugepage or HWPoisoned hugepage is already
+		 * unmapped and its refcount is dropped
 		 */
-		if (unlikely(is_hugetlb_entry_hwpoisoned(pte)))
+		if (unlikely(!pte_present(pte)))
 			continue;
 
 		page = pte_page(pte);

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