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Date: Mon, 15 Sep 2014 18:39:59 -0400 From: Naoya Horiguchi <n-horiguchi@...jp.nec.com> To: Andrew Morton <akpm@...ux-foundation.org>, Hugh Dickins <hughd@...gle.com> Cc: David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Naoya Horiguchi <nao.horiguchi@...il.com>, <stable@...r.kernel.org> Subject: [PATCH v3 5/5] mm/hugetlb: add migration entry check in __unmap_hugepage_range If __unmap_hugepage_range() tries to unmap the address range over which hugepage migration is on the way, we get the wrong page because pte_page() doesn't work for migration entries. This patch simply clears the pte for migration entries as we do for hwpoison entries. Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com> Cc: <stable@...r.kernel.org> # [2.6.36+] --- ChangeLog v4: - check hwpoisoned hugepage and migrating hugepage with the same check instead of doing separately --- mm/hugetlb.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git mmotm-2014-09-09-14-42.orig/mm/hugetlb.c mmotm-2014-09-09-14-42/mm/hugetlb.c index 461ee1e10067..1ecb625bc498 100644 --- mmotm-2014-09-09-14-42.orig/mm/hugetlb.c +++ mmotm-2014-09-09-14-42/mm/hugetlb.c @@ -2653,9 +2653,10 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, goto unlock; /* - * HWPoisoned hugepage is already unmapped and dropped reference + * Migrating hugepage or HWPoisoned hugepage is already + * unmapped and its refcount is dropped, so just clear pte here. */ - if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) { + if (unlikely(!pte_present(pte))) { huge_pte_clear(mm, address, ptep); goto unlock; } -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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