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/[email protected]
Signed-off-by: Punit Agrawal <[email protected]>
Acked-by: Steve Capper <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Hillf Danton <[email protected]>
Cc: Aneesh Kumar K.V <[email protected]>
Cc: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/mm/rmap.c b/mm/rmap.c
index 130c238f..b2557433 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
