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

From: Stephen Rothwell <[email-masked]>
Date: Mon, 17 Nov 2025 10:23:10 +1100

Hi all,

After merging the mm-nonmm-unstable tree, today's linux-next build
(x86_64 allmodconfig) failed like this:

error[E0425]: cannot find function `rb_first` in crate `bindings`
   --> rust/kernel/rbtree.rs:209:42
    |
209 |                 next: unsafe { bindings::rb_first(&self.root) },
    |                                          ^^^^^^^^ not found in `bindings`

error[E0425]: cannot find function `rb_first` in crate `bindings`
   --> rust/kernel/rbtree.rs:224:42
    |
224 |                 next: unsafe { bindings::rb_first(from_mut(&mut self.root)) },
    |                                          ^^^^^^^^ not found in `bindings`

error[E0425]: cannot find function `rb_first` in crate `bindings`
   --> rust/kernel/rbtree.rs:249:42
    |
249 |         let current = unsafe { bindings::rb_first(root) };
    |                                          ^^^^^^^^ not found in `bindings`

error[E0425]: cannot find function `rb_last` in crate `bindings`
     --> rust/kernel/rbtree.rs:264:42
      |
264   |         let current = unsafe { bindings::rb_last(root) };
      |                                          ^^^^^^^ help: a function with a similar name exists: `sg_last`
      |
     ::: rust/bindings/bindings_generated.rs:90155:5
      |
90155 |     pub fn sg_last(s: *mut scatterlist, arg1: ffi::c_uint) -> *mut scatterlist;
      |     --------------------------------------------------------------------------- similarly named function `sg_last` defined here

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0425`.

Caused by commit

  84aa8c5fc414 ("rbtree: inline rb_first()")

I have reverted that commit and the following one for today.

-- 
Cheers,
Stephen Rothwell