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authorHugh Dickins <hugh.dickins@tiscali.co.uk>2009-10-26 16:49:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-10-29 07:39:24 -0700
commit92f7ba70eecf4da8264a767b181cc2090f62d4ad (patch)
treec8e0fe4239efcf114a01896e3836b30cddf0ba1b /mm
parentcpufreq: add cpufreq_get() stub for CONFIG_CPU_FREQ=n (diff)
downloadlinux-dev-92f7ba70eecf4da8264a767b181cc2090f62d4ad.tar.xz
linux-dev-92f7ba70eecf4da8264a767b181cc2090f62d4ad.zip
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. We could fix it for 2.6.32 at the KSM end, by putting a dummy anon_vma pointer in there; but that would get harder next time, when KSM will put a pointer to something else there (and I'm not currently planning to do any work to open that up to memory_failure). So I would prefer this simple PageKsm test, until the other exceptions are handled. Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--mm/memory-failure.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 729d4b15b645..7fc2130d2737 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>
@@ -661,7 +662,7 @@ 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;
if (!PageLRU(p))