linux-kernel - Re: [BUG objtool,x86] Missing __noreturn annotation in acpi_processor_ffh_play

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Message-ID: <20250228191213.7drb265s7jrrjf7b@jpoimboe>
Date: Fri, 28 Feb 2025 11:12:13 -0800
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: patryk.wlazlyn@...ux.intel.com, artem.bityutskiy@...ux.intel.com,
	dave.hansen@...ux.intel.com, gautham.shenoy@....com,
	rafael.j.wysocki@...el.com, linux-kernel@...r.kernel.org,
	sfr@...b.auug.org.au, peterz@...radead.org
Subject: Re: [BUG objtool,x86] Missing __noreturn annotation in
 acpi_processor_ffh_play_dead()

On Fri, Feb 28, 2025 at 11:00:07AM -0800, Paul E. McKenney wrote:
> Hello!
> 
> My recent -next testing hits this objtool complaint:
> 
> vmlinux.o: warning: objtool: acpi_idle_play_dead+0x3c: acpi_processor_ffh_play_dead() is missing a __noreturn annotation
> 
> My attempts to silence this by adding the suggested __noreturn annotations
> didn't help, and often got me compiler warnings about __noreturn functions
> actually returning.  So I bisected, which converges on this innocent-looking
> commit:
> 
> a7dd183f0b38 ("x86/smp: Allow calling mwait_play_dead with an arbitrary hint")
> 
> Several runs verified that this really is the commit that objtool is
> complaining about.  Unfortunately, this commit does not revert cleanly.
> 
> This is from builds using clang version 19.1.5 (CentOS 19.1.5-2.el9).
> 
> Help?

I can take a look.  Is it LLVM defconfig?  Otherwise can you send the
.config?

-- 
Josh