Subject: Re: linux-next: build failure after merge of the mm-nonmm-unstable tree

From: Miguel Ojeda <[email-masked]>
Date: Thu, 20 Nov 2025 09:55:18 +0100

On Wed, 19 Nov 2025 15:48:24 -0800 Andrew Morton <[email-masked]> wrote:
>
> Thanks, I'll disable them for now.
>
> Alice, can you please help us with a fix?  Simple patch follows:

Something like this should work (I would suggest adding each helper into
the right commit that performs each move to the header):

diff --git a/rust/helpers/rbtree.c b/rust/helpers/rbtree.c
index 6d404b84a9b5..2a0eabbb4160 100644
--- a/rust/helpers/rbtree.c
+++ b/rust/helpers/rbtree.c
@@ -7,3 +7,13 @@ void rust_helper_rb_link_node(struct rb_node *node, struct rb_node *parent,
 {
        rb_link_node(node, parent, rb_link);
 }
+
+struct rb_node *rust_helper_rb_first(const struct rb_root *root)
+{
+       return rb_first(root);
+}
+
+struct rb_node *rust_helper_rb_last(const struct rb_root *root)
+{
+       return rb_last(root);
+}

Cheers,
Miguel