From: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Date: Tue, 13 Oct 2009 14:02:11 +0000 (+0100)
Subject: HWPOISON: fix oops on ksm pages
X-Git-Tag: upstream/snapshot3+hdmi~16715^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=01e00f880ca700376e1845cf7a2524ebe68e47d6;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

HWPOISON: fix oops on ksm pages

Memory failure on a KSM page currently oopses on its NULL anon_vma in
page_lock_anon_vma(): that may not be much worse than the consequence
of ignoring it, but it is better to be consistent with how ZERO_PAGE
and hugetlb pages and other awkward cases are treated.  Just skip it.

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index e17ec3f..e354b9f 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -35,6 +35,7 @@
 #include <linux/mm.h>
 #include <linux/page-flags.h>
 #include <linux/sched.h>
+#include <linux/ksm.h>
 #include <linux/rmap.h>
 #include <linux/pagemap.h>
 #include <linux/swap.h>
@@ -644,7 +645,7 @@ static void hwpoison_user_mappings(struct page *p, unsigned long pfn,
 	int i;
 	int kill = 1;
 
-	if (PageReserved(p) || PageCompound(p) || PageSlab(p))
+	if (PageReserved(p) || PageCompound(p) || PageSlab(p) || PageKsm(p))
 		return;
 
 	/*