Messages in this thread Patch in this message | | | From | Naoya Horiguchi <> | Subject | [PATCH 2/3] HWPOISON, hugetlbfs: fix "bad pmd" warning in unmapping hwpoisoned hugepage | Date | Wed, 5 Dec 2012 16:47:37 -0500 |
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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> --- mm/hugetlb.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git v3.7-rc8.orig/mm/hugetlb.c v3.7-rc8/mm/hugetlb.c index e61a749..fe7c2a7 100644 --- v3.7-rc8.orig/mm/hugetlb.c +++ v3.7-rc8/mm/hugetlb.c @@ -2387,8 +2387,10 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, /* * 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); /* -- 1.7.11.7
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