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-rw-r--r--mm/khugepaged.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 87e1a7ca3846..2779c63bdea0 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1403,6 +1403,9 @@ static void collapse_shmem(struct mm_struct *mm,
spin_lock_irq(&mapping->tree_lock);
+ slot = radix_tree_lookup_slot(&mapping->page_tree, index);
+ VM_BUG_ON_PAGE(page != radix_tree_deref_slot_protected(slot,
+ &mapping->tree_lock), page);
VM_BUG_ON_PAGE(page_mapped(page), page);
/*
@@ -1426,6 +1429,7 @@ static void collapse_shmem(struct mm_struct *mm,
radix_tree_replace_slot(slot,
new_page + (index % HPAGE_PMD_NR));
+ slot = radix_tree_iter_next(&iter);
index++;
continue;
out_lru:
@@ -1537,6 +1541,7 @@ tree_unlocked:
putback_lru_page(page);
unlock_page(page);
spin_lock_irq(&mapping->tree_lock);
+ slot = radix_tree_iter_next(&iter);
}
VM_BUG_ON(nr_none);
spin_unlock_irq(&mapping->tree_lock);