diff --git a/mm/truncate.c b/mm/truncate.c
index f4edbc179d14423e1f3acf9555b96bc9795b37bc..fca28839c46e895e6d137ca7497c98736be348bd 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -396,6 +396,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
 		pagevec_release(&pvec);
 		cond_resched();
 	}
+	WARN_ON_ONCE(ret);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);