linux-kernel - [22/73] mm: fix dubious code in __count_immobile

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Message-Id: <20110305005636.735208441@clark.kroah.org>
Date:	Fri, 04 Mar 2011 16:55:27 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Namhyung Kim <namhyung@...il.com>
Subject: [22/73] mm: fix dubious code in __count_immobile_pages()

2.6.37-stable review patch.  If anyone has any objections, please let us know.

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

From: Namhyung Kim <namhyung@...il.com>

commit 29723fccc837d20039078f7a571e8d457eb0d6c6 upstream.

When pfn_valid_within() failed 'iter' was incremented twice.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 mm/page_alloc.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5335,10 +5335,9 @@ __count_immobile_pages(struct zone *zone
 	for (found = 0, iter = 0; iter < pageblock_nr_pages; iter++) {
 		unsigned long check = pfn + iter;
 
-		if (!pfn_valid_within(check)) {
-			iter++;
+		if (!pfn_valid_within(check))
 			continue;
-		}
+
 		page = pfn_to_page(check);
 		if (!page_count(page)) {
 			if (PageBuddy(page))


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