Messages in this thread Patch in this message | | | From | Naoya Horiguchi <> | Subject | [PATCH 1/7] hugetlb: check swap entry in follow_hugetlb_page() | Date | Fri, 21 Jan 2011 15:28:54 +0900 |
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KVM host calls follow_hugetlb_page() in HVA-PFN translation (through get_user_pages(),) so we need to have it handle swap entry to detect HWPOISONed or migrating hugepages.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> --- mm/hugetlb.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git v2.6.38-rc1/mm/hugetlb.c v2.6.38-rc1/mm/hugetlb.c index bb0b7c1..97c7471 100644 --- v2.6.38-rc1/mm/hugetlb.c +++ v2.6.38-rc1/mm/hugetlb.c @@ -2731,6 +2731,7 @@ int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, while (vaddr < vma->vm_end && remainder) { pte_t *pte; int absent; + int swap; struct page *page; /* @@ -2740,6 +2741,7 @@ int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, */ pte = huge_pte_offset(mm, vaddr & huge_page_mask(h)); absent = !pte || huge_pte_none(huge_ptep_get(pte)); + swap = !absent && !pte_present(*pte); /* * When coredumping, it suits get_dump_page if we just return @@ -2754,7 +2756,7 @@ int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, break; } - if (absent || + if (absent || swap || ((flags & FOLL_WRITE) && !pte_write(huge_ptep_get(pte)))) { int ret; -- 1.7.3.4
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