1 files changed, 10 insertions, 2 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 004c9c2aac78..b6c1ce3c53b5 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1162,7 +1162,12 @@ static void __split_huge_page_refcount(struct page *page)
                 /* after clearing PageTail the gup refcount can be released */
                 smp_mb();
 
-                page_tail->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
+                /*
+                 * retain hwpoison flag of the poisoned tail page:
+                 *   fix for the unsuitable process killed on Guest Machine(KVM)
+                 *   by the memory-failure.
+                 */
+                page_tail->flags &= ~PAGE_FLAGS_CHECK_AT_PREP | __PG_HWPOISON;
                 page_tail->flags |= (page->flags &
                                      ((1L << PG_referenced) |
                                       (1L << PG_swapbacked) |
@@ -1203,6 +1208,8 @@ static void __split_huge_page_refcount(struct page *page)
                 BUG_ON(!PageDirty(page_tail));
                 BUG_ON(!PageSwapBacked(page_tail));
 
+                mem_cgroup_split_huge_fixup(page, page_tail);
+
                 lru_add_page_tail(zone, page, page_tail);
         }
 
@@ -1837,9 +1844,9 @@ static void collapse_huge_page(struct mm_struct *mm,
         spin_lock(ptl);
         isolated = __collapse_huge_page_isolate(vma, address, pte);
         spin_unlock(ptl);
-        pte_unmap(pte);
 
         if (unlikely(!isolated)) {
+                pte_unmap(pte);
                 spin_lock(&mm->page_table_lock);
                 BUG_ON(!pmd_none(*pmd));
                 set_pmd_at(mm, address, pmd, _pmd);
@@ -1856,6 +1863,7 @@ static void collapse_huge_page(struct mm_struct *mm,
         anon_vma_unlock(vma->anon_vma);
 
         __collapse_huge_page_copy(pte, new_page, vma, address, ptl);
+        pte_unmap(pte);
         __SetPageUptodate(new_page);
         pgtable = pmd_pgtable(_pmd);
         VM_BUG_ON(page_count(pgtable) != 1);