The patch titled
hwpoison: fix oops on ksm pages
has been added to the -mm tree. Its filename is
hwpoison-fix-oops-on-ksm-pages.patch
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------------------------------------------------------
Subject: hwpoison: fix oops on ksm pages
From: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN mm/memory-failure.c~hwpoison-fix-oops-on-ksm-pages mm/memory-failure.c
--- a/mm/memory-failure.c~hwpoison-fix-oops-on-ksm-pages
+++ a/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(struc
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))
_
Patches currently in -mm which might be from hugh.dickins@xxxxxxxxxxxxx are
hwpoison-fix-oops-on-ksm-pages.patch
hwpoison-fix-proc-meminfo-alignment.patch
mmap-dont-return-enomem-when-mapcount-is-temporarily-exceeded-in-munmap.patch
mmap-dont-return-enomem-when-mapcount-is-temporarily-exceeded-in-munmap-checkpatch-fixes.patch
elf-kill-use_elf_core_dump.patch
prio_tree-debugging-patch.patch
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