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authorPunit Agrawal <punit.agrawal@arm.com>2017-07-06 15:39:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-06 16:24:34 -0700
commit5fd27b8e7dbcab0dc5a1346305679ba4bcc20977 (patch)
tree08bddd63da8eee5cc5d021c12b6a78401a17c4e8
parente5251fd43007f9e1155331f0fa30685604a8e3a1 (diff)
mm: rmap: use correct helper when poisoning hugepages
Using set_pte_at() does not do the right thing when putting down HWPOISON swap entries for hugepages on architectures that support contiguous ptes. Fix this problem by using set_huge_swap_pte_at() which was introduced to fix exactly this problem. Link: http://lkml.kernel.org/r/20170522133604.11392-7-punit.agrawal@arm.com Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> Acked-by: Steve Capper <steve.capper@arm.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/rmap.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index 130c238fe384..b255743351e5 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1367,15 +1367,18 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
update_hiwater_rss(mm);
if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) {
+ pteval = swp_entry_to_pte(make_hwpoison_entry(subpage));
if (PageHuge(page)) {
int nr = 1 << compound_order(page);
hugetlb_count_sub(nr, mm);
+ set_huge_swap_pte_at(mm, address,
+ pvmw.pte, pteval,
+ vma_mmu_pagesize(vma));
} else {
dec_mm_counter(mm, mm_counter(page));
+ set_pte_at(mm, address, pvmw.pte, pteval);
}
- pteval = swp_entry_to_pte(make_hwpoison_entry(subpage));
- set_pte_at(mm, address, pvmw.pte, pteval);
} else if (pte_unused(pteval)) {
/*
* The guest indicated that the page content is of no