linux-kernel - Re: [PATCH v2] MIPS: SMP-CPS: fix build error when HOTPLUG

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Date:   Sun, 19 Feb 2023 09:30:39 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Dengcheng Zhu <dzhu@...ecomp.com>,
        Paul Burton <paulburton@...nel.org>,
        linux-mips@...r.kernel.org,
        Sergei Shtylyov <sergei.shtylyov@...il.com>
Subject: Re: [PATCH v2] MIPS: SMP-CPS: fix build error when HOTPLUG_CPU not
 set

On Fri, Feb 17, 2023 at 12:07:49PM -0800, Randy Dunlap wrote:
> When MIPS_CPS=y, MIPS_CPS_PM is not set, HOTPLUG_CPU is not set, and
> KEXEC=y, cps_shutdown_this_cpu() attempts to call cps_pm_enter_state(),
> which is not built when MIPS_CPS_PM is not set.
> Conditionally execute the else branch based on CONFIG_HOTPLUG_CPU
> to remove the build error.
> This build failure is from a randconfig file.
> 
> mips-linux-ld: arch/mips/kernel/smp-cps.o: in function `$L162':
> smp-cps.c:(.text.cps_kexec_nonboot_cpu+0x31c): undefined reference to `cps_pm_enter_state'
> 
> Fixes: 1447864bee4c ("MIPS: kexec: CPS systems to halt nonboot CPUs")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Dengcheng Zhu <dzhu@...ecomp.com>
> Cc: Paul Burton <paulburton@...nel.org>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> Cc: linux-mips@...r.kernel.org
> Cc: Sergei Shtylyov <sergei.shtylyov@...il.com>
> ---
> v2: use IS_ENABLED() instead of #ifdef-ery (Sergei)
> 
>  arch/mips/kernel/smp-cps.c |    8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff -- a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
> --- a/arch/mips/kernel/smp-cps.c
> +++ b/arch/mips/kernel/smp-cps.c
> @@ -424,9 +424,11 @@ static void cps_shutdown_this_cpu(enum c
>  			wmb();
>  		}
>  	} else {
> -		pr_debug("Gating power to core %d\n", core);
> -		/* Power down the core */
> -		cps_pm_enter_state(CPS_PM_POWER_GATED);
> +		if (IS_ENABLED(CONFIG_HOTPLUG_CPU)) {
> +			pr_debug("Gating power to core %d\n", core);
> +			/* Power down the core */
> +			cps_pm_enter_state(CPS_PM_POWER_GATED);
> +		}
>  	}
>  }
>  

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]