On Fri, Jan 11, 2019 at 03:58:43PM -0500, Qian Cai wrote: > diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c > index b7055b2a07d3..afad0213a117 100644 > --- a/lib/rbtree_test.c > +++ b/lib/rbtree_test.c > @@ -345,6 +345,17 @@ static int __init rbtree_test_init(void) > check(0); > } > > + /* > + * a little regression test to catch a bug may be introduced by > + * 6d58452dc06 (rbtree: adjust root color in rb_insert_color() only when > + * necessary) > + */ > + insert(nodes, &root); > + nodes->rb.__rb_parent_color = RB_RED; > + insert(nodes + 1, &root); > + erase(nodes + 1, &root); > + erase(nodes, &root); That's not a fair test! You're poking around in the data structure to create the situation. This test would have failed before 6d58452dc06 too. How do we create a tree that has a red parent at root, only using insert() and erase()?
