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>

1 files changed, 3 insertions, 1 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bd22bd895299..e53f39cd67db 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);
                 /*