mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page()

[deliverable/linux.git] / include / linux / swap.h

diff --git a/include/linux/swap.h b/include/linux/swap.h
index b17cc4830fa670512abdc3987f58fc55e583f0bc..4a529c984a3fa5e67e3e1f5010c8b17666dab480 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -257,6 +257,7 @@ static inline void workingset_node_pages_inc(struct radix_tree_node *node)
 
 static inline void workingset_node_pages_dec(struct radix_tree_node *node)
 {
+       VM_BUG_ON(!workingset_node_pages(node));
        node->count--;
 }
 
@@ -272,6 +273,7 @@ static inline void workingset_node_shadows_inc(struct radix_tree_node *node)
 
 static inline void workingset_node_shadows_dec(struct radix_tree_node *node)
 {
+       VM_BUG_ON(!workingset_node_shadows(node));
        node->count -= 1U << RADIX_TREE_COUNT_SHIFT;
 }