linux-kernel - Re: [PATCH v5 07/45] CPU hotplug: Provide APIs to prevent CPU offline from atomic context

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Message-ID: <87mwvsuw68.fsf@sejong.aot.lge.com>
Date:	Tue, 29 Jan 2013 19:21:19 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	mingo@...nel.org, akpm@...ux-foundation.org, rostedt@...dmis.org,
	wangyun@...ux.vnet.ibm.com, xiaoguangrong@...ux.vnet.ibm.com,
	rjw@...k.pl, sbw@....edu, fweisbec@...il.com,
	linux@....linux.org.uk, nikunj@...ux.vnet.ibm.com,
	linux-pm@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 07/45] CPU hotplug: Provide APIs to prevent CPU offline from atomic context

Hi Srivatsa,

On Tue, 22 Jan 2013 13:04:54 +0530, Srivatsa S. Bhat wrote:
> @@ -246,15 +291,21 @@ struct take_cpu_down_param {
>  static int __ref take_cpu_down(void *_param)
>  {
>  	struct take_cpu_down_param *param = _param;
> -	int err;
> +	unsigned long flags;
> +	int err = 0;

It seems no need to set 'err' to 0.

Thanks,
Namhyung

> +
> +	percpu_write_lock_irqsave(&hotplug_pcpu_rwlock, &flags);
>  
>  	/* Ensure this CPU doesn't handle any more interrupts. */
>  	err = __cpu_disable();
>  	if (err < 0)
> -		return err;
> +		goto out;
>  
>  	cpu_notify(CPU_DYING | param->mod, param->hcpu);
> -	return 0;
> +
> +out:
> +	percpu_write_unlock_irqrestore(&hotplug_pcpu_rwlock, &flags);
> +	return err;
>  }
>  
>  /* Requires cpu_add_remove_lock to be held */
>
> --
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