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

[Stephen Rothwell]

Hi all,

On Mon, 17 Nov 2025 10:23:10 +1100 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>
> 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.

I am still reverting those commits.

-- 
Cheers,
Stephen Rothwell

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