linux-kernel - Re: [PATCH 1/5] objtool/rust: add one more `noreturn` Rust function for Rust 1.87.0

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Message-ID: <devk5empq6e3fy4vp5mhxaznzrxfso6d4bqqzpzachlwy5w567@32tvtoddkn6p>
Date: Thu, 15 May 2025 09:18:34 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Timur Tabi <ttabi@...dia.com>
Cc: Joel Fernandes <joelagnelf@...dia.com>, 
	"gary@...yguo.net" <gary@...yguo.net>, "a.hindborg@...nel.org" <a.hindborg@...nel.org>, 
	"ojeda@...nel.org" <ojeda@...nel.org>, "boqun.feng@...il.com" <boqun.feng@...il.com>, 
	"patches@...ts.linux.dev" <patches@...ts.linux.dev>, "stable@...r.kernel.org" <stable@...r.kernel.org>, 
	"tmgross@...ch.edu" <tmgross@...ch.edu>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"alex.gaynor@...il.com" <alex.gaynor@...il.com>, "benno.lossin@...ton.me" <benno.lossin@...ton.me>, 
	John Hubbard <jhubbard@...dia.com>, 
	"rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>, "bjorn3_gh@...tonmail.com" <bjorn3_gh@...tonmail.com>, 
	"peterz@...radead.org" <peterz@...radead.org>, "aliceryhl@...gle.com" <aliceryhl@...gle.com>, 
	Alexandre Courbot <acourbot@...dia.com>, "dakr@...nel.org" <dakr@...nel.org>, 
	Alistair Popple <apopple@...dia.com>
Subject: Re: [PATCH 1/5] objtool/rust: add one more `noreturn` Rust function
 for Rust 1.87.0

On Wed, May 14, 2025 at 07:46:49PM +0000, Timur Tabi wrote:
> On Wed, 2025-05-14 at 12:14 -0700, Josh Poimboeuf wrote:
> > The above warning is in completely different code from the Rust one, so
> > they're likely unrelated.
> 
> True, but the fall-through is bogus in the C code as well.
> 
> > The fallthrough warnings are typically caused by either Clang undefined
> > behavior (usually potential divide by zero or negative shift), or a call
> > to an unannotated noreturn function.
> > 
> > Timur, can you share your .config and compiler version?
> 
> .config: https://pastebin.com/inDHfmbG
> 
> ttabi@...bi:~$ llvm-config --version
> 18.1.3
> ttabi@...bi:~$ gcc --version
> gcc (Ubuntu 14.2.0-4ubuntu2~24.04) 14.2.0
> 
> Since I build with LLVM=1, I'm assuming the answer is 18.1.3

I'm not able to recreate, can you run with OBJTOOL_VERBOSE=1 and paste
the output?

-- 
Josh