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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>
This commit is contained in:
Naoya Horiguchi 2012-12-12 13:52:28 -08:00 committed by Linus Torvalds
parent 4128997b5f
commit 8c4894c6bc
1 changed files with 3 additions and 1 deletions
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4
mm/hugetlb.c
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@ -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);
/*