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    SubjectRe: [PATCH v2] rbtree: fix the red root
    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()?

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