linux-kernel - Re: [PATCH 12/22] powerpc/cpu: Mark start_secondary_resume() _

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Message-ID: <87v8kfdp7l.fsf@mpe.ellerman.id.au>
Date:   Mon, 06 Feb 2023 22:10:22 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Josh Poimboeuf <jpoimboe@...nel.org>, linux-kernel@...r.kernel.org
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Subject: Re: [PATCH 12/22] powerpc/cpu: Mark start_secondary_resume()
 __noreturn

Josh Poimboeuf <jpoimboe@...nel.org> writes:
> start_secondary_resume() doesn't return.  Annotate it as such.  By
> extension this also makes arch_cpu_idle_dead() noreturn.

Can we also mark arch_cpu_idle_dead() (the C function) __noreturn ?

Seems like it would be good documentation, even if it's not required
once the generic prototype is __noreturn.

But not a show-stopper.

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers

> diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h
> index f63505d74932..cfd42ca8765c 100644
> --- a/arch/powerpc/include/asm/smp.h
> +++ b/arch/powerpc/include/asm/smp.h
> @@ -66,7 +66,7 @@ void start_secondary(void *unused);
>  extern int smp_send_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us);
>  extern int smp_send_safe_nmi_ipi(int cpu, void (*fn)(struct pt_regs *), u64 delay_us);
>  extern void smp_send_debugger_break(void);
> -extern void start_secondary_resume(void);
> +extern void __noreturn start_secondary_resume(void);
>  extern void smp_generic_give_timebase(void);
>  extern void smp_generic_take_timebase(void);
>  
> -- 
> 2.39.0