linux-kernel - [PATCH 1/3] mm/pagewalk.c: fix end address calculation in walk_page

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Date:	Wed, 26 Feb 2014 23:39:35 -0500
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] mm/pagewalk.c: fix end address calculation in walk_page_range()

When we try to walk over inside a vma, walk_page_range() tries to walk
until vma->vm_end even if a given end is before that point.
So this patch takes the smaller one as an end address.

Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---
 mm/pagewalk.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git next-20140220.orig/mm/pagewalk.c next-20140220/mm/pagewalk.c
index 416e981243b1..b418407ff4da 100644
--- next-20140220.orig/mm/pagewalk.c
+++ next-20140220/mm/pagewalk.c
@@ -321,8 +321,9 @@ int walk_page_range(unsigned long start, unsigned long end,
 			next = vma->vm_start;
 		} else { /* inside the found vma */
 			walk->vma = vma;
-			next = vma->vm_end;
-			err = walk_page_test(start, end, walk);
+			next = min_t(unsigned long, end, vma->vm_end);
+
+			err = walk_page_test(start, next, walk);
 			if (skip_lower_level_walking(walk))
 				continue;
 			if (err)
-- 
1.8.5.3

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