[PATCH] objtool/rust: add one more `noreturn` Rust function for Rust 1.99.0

[PATCH] objtool/rust: add one more `noreturn` Rust function for Rust 1.99.0

[Miguel Ojeda]

Starting with Rust 1.99.0 (expected 2026-10-01), under
`CONFIG_RUST_DEBUG_ASSERTIONS=y`, `objtool` may report:

    rust/kernel.o: warning: objtool: _R..._6kernel12module_param9set_paramaEB4_()
    falls through to next function _R..._6kernel12module_param9set_paramhEB4_()

(and many others) due to calls to the `noreturn` symbol [1]:

    core::panicking::panic_null_reference_constructed

Thus add the mangled one to the list so that `objtool` knows it is
actually `noreturn`.

See commit 56d680dd23c3 ("objtool/rust: list `noreturn` Rust functions")
for more details.

Cc: stable@vger.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs).
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Pavlu <petr.pavlu@suse.com>
Link: https://github.com/rust-lang/rust/pull/158796 [1]
Reported-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/rust-for-linux/alEBInX9gD1M5NAr@google.com/
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 tools/objtool/check.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 10b18cf9c360..f03dd59e7fca 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -206,6 +206,7 @@ static bool is_rust_noreturn(const struct symbol *func)
 	       str_ends_with(func->name, "_4core9panicking18panic_nounwind_fmt")			||
 	       str_ends_with(func->name, "_4core9panicking19assert_failed_inner")			||
 	       str_ends_with(func->name, "_4core9panicking30panic_null_pointer_dereference")		||
+	       str_ends_with(func->name, "_4core9panicking32panic_null_reference_constructed")		||
 	       str_ends_with(func->name, "_4core9panicking36panic_misaligned_pointer_dereference")	||
 	       str_ends_with(func->name, "_7___rustc17rust_begin_unwind")				||
 	       strstr(func->name, "_4core9panicking13assert_failed")					||

base-commit: 22ed4af6f0a9f55e6900b69708d3359a01d65b2d
--
2.55.0

Re: [PATCH] objtool/rust: add one more `noreturn` Rust function for Rust 1.99.0

[Miguel Ojeda]

On Fri, Jul 10, 2026 at 7:33 PM Miguel Ojeda <ojeda@kernel.org> wrote:
>
> Starting with Rust 1.99.0 (expected 2026-10-01), under
> `CONFIG_RUST_DEBUG_ASSERTIONS=y`, `objtool` may report:
>
>     rust/kernel.o: warning: objtool: _R..._6kernel12module_param9set_paramaEB4_()
>     falls through to next function _R..._6kernel12module_param9set_paramhEB4_()
>
> (and many others) due to calls to the `noreturn` symbol [1]:
>
>     core::panicking::panic_null_reference_constructed
>
> Thus add the mangled one to the list so that `objtool` knows it is
> actually `noreturn`.
>
> See commit 56d680dd23c3 ("objtool/rust: list `noreturn` Rust functions")
> for more details.
>
> Cc: stable@vger.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs).
> Cc: Josh Poimboeuf <jpoimboe@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Petr Pavlu <petr.pavlu@suse.com>
> Link: https://github.com/rust-lang/rust/pull/158796 [1]
> Reported-by: Alice Ryhl <aliceryhl@google.com>
> Link: https://lore.kernel.org/rust-for-linux/alEBInX9gD1M5NAr@google.com/
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Applied to `rust-fixes` -- thanks!

I changed a Link: to Closes:

Tags still welcome for a day or so.

Cheers,
Miguel

Re: [PATCH] objtool/rust: add one more `noreturn` Rust function for Rust 1.99.0

[Alice Ryhl]

On Fri, Jul 10, 2026 at 07:32:52PM +0200, Miguel Ojeda wrote:
> Starting with Rust 1.99.0 (expected 2026-10-01), under
> `CONFIG_RUST_DEBUG_ASSERTIONS=y`, `objtool` may report:
> 
>     rust/kernel.o: warning: objtool: _R..._6kernel12module_param9set_paramaEB4_()
>     falls through to next function _R..._6kernel12module_param9set_paramhEB4_()
> 
> (and many others) due to calls to the `noreturn` symbol [1]:
> 
>     core::panicking::panic_null_reference_constructed
> 
> Thus add the mangled one to the list so that `objtool` knows it is
> actually `noreturn`.
> 
> See commit 56d680dd23c3 ("objtool/rust: list `noreturn` Rust functions")
> for more details.
> 
> Cc: stable@vger.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs).
> Cc: Josh Poimboeuf <jpoimboe@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Petr Pavlu <petr.pavlu@suse.com>
> Link: https://github.com/rust-lang/rust/pull/158796 [1]
> Reported-by: Alice Ryhl <aliceryhl@google.com>
> Link: https://lore.kernel.org/rust-for-linux/alEBInX9gD1M5NAr@google.com/
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Tested-by: Alice Ryhl <aliceryhl@google.com>