linux-kernel - Re: [PATCH 10/25] s390/smp: Make cpu notifier symetric

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Date:   Fri, 4 Nov 2016 15:22:19 +0100
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, rt@...utronix.de,
        Thomas Gleixner <tglx@...utronix.de>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH 10/25] s390/smp: Make cpu notifier symetric

On Thu, Nov 03, 2016 at 03:50:06PM +0100, Sebastian Andrzej Siewior wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> There is no reason to remove the sysfs cpu files when the CPU is dead, they
> can be removed when the cpu is prepared to go down. Doing it at
> DOWN_PREPARE allows us to convert it to a symetric hotplug state in the
> next step.
> 
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: linux-s390@...r.kernel.org
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
>  arch/s390/kernel/smp.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
> index 35531fe1c5ea..1a21e66c484a 100644
> --- a/arch/s390/kernel/smp.c
> +++ b/arch/s390/kernel/smp.c
> @@ -1056,9 +1056,10 @@ static int smp_cpu_notify(struct notifier_block *self, unsigned long action,
>  
>  	switch (action & ~CPU_TASKS_FROZEN) {
>  	case CPU_ONLINE:
> +	case CPU_DOWN_FAILED:
>  		err = sysfs_create_group(&s->kobj, &cpu_online_attr_group);
>  		break;
> -	case CPU_DEAD:
> +	case CPU_DOWN_PREPARE::

This won't compile... even though it will be removed with the following
patch it would be good to fix this to keep this bisectable.