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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2012-12-12 13:52:28 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 17:38:35 -0800
commit8c4894c6bc790d0e31e072202939ac6747bbe7ac (patch)
tree9ebb05f3ccb1e5f810f25916cf61a8913eaca1fe
parent4128997b5f0e7ad583a5f3990051b8188b39055c (diff)
hwpoison, hugetlbfs: fix "bad pmd" warning in unmapping hwpoisoned hugepage
When a process which used a hwpoisoned hugepage tries to exit() or munmap(), the kernel can print out "bad pmd" message because page table walker in free_pgtables() encounters 'hwpoisoned entry' on pmd. This is because currently we fail to clear the hwpoisoned entry in __unmap_hugepage_range(), so this patch simply does it. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andi Kleen <andi.kleen@intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/hugetlb.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bd22bd89529..e53f39cd67d 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2386,8 +2386,10 @@ again:
/*
* HWPoisoned hugepage is already unmapped and dropped reference
*/
- if (unlikely(is_hugetlb_entry_hwpoisoned(pte)))
+ if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) {
+ pte_clear(mm, address, ptep);
continue;
+ }
page = pte_page(pte);
/*