Re: [PATCH] objtool/rust: add one more `noreturn` Rust function

On Tue, Aug 18, 2026 at 6:38 PM Gary Guo <[email protected]> wrote:
>
> I am seeing this function causing issue on my 1.85.1 -Os build, although the
> error message is different this time:
>
> rust/kernel.o: warning: objtool: _RNvXs2_NtNtCsaNryh1j6xD7_4core3str6traitseINtNtNtB9_3ops5index5IndexINtNtBJ_5range9RangeFromjEE5indexCsldbe0TGTmNx_6kernel+0x1d: stack state mismatch: cfa1=4+8 cfa2=4+16
>
> Disassembly shows that the function call before the warning location is a call
> to _4core3str16slice_error_fail, and objtool thought it can return (which will
> end up with a unbalanced stack if it does return).
>
> Applying the patch fixes the issue.

Thanks Gary, then I will pick it up.

Cheers,
Miguel