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| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2012-12-12 13:52:28 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-12 17:38:35 -0800 |
| commit | 8c4894c6bc790d0e31e072202939ac6747bbe7ac (patch) | |
| tree | 9ebb05f3ccb1e5f810f25916cf61a8913eaca1fe /mm/hugetlb.c | |
| parent | 4128997b5f0e7ad583a5f3990051b8188b39055c (diff) | |
| download | lwn-8c4894c6bc790d0e31e072202939ac6747bbe7ac.tar.gz lwn-8c4894c6bc790d0e31e072202939ac6747bbe7ac.zip | |
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>
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 4 |
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); /* |