linux-kernel - Re: [PATCH v2] kernel/padata.c: share code between CPU_ONLINE and CPU_DOWN_FAILED, same to CPU_DOWN_PREPARE and CPU_UP

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Date:	Fri, 23 Aug 2013 11:46:59 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
CC:	linux-crypto@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] kernel/padata.c: share code between CPU_ONLINE and
 CPU_DOWN_FAILED, same to CPU_DOWN_PREPARE and CPU_UP_CANCELED

On 08/22/2013 02:43 PM, Chen Gang wrote:
> Share code between CPU_ONLINE and CPU_DOWN_FAILED, same to
> CPU_DOWN_PREPARE and CPU_UP_CANCELED.
> 
> It will fix 2 bugs:
> 
>   "not check the return value of __padata_remove_cpu() and __padata_add_cpu()".
>   "need add 'break' between CPU_UP_CANCELED and CPU_DOWN_FAILED".
> 

Do we need more details descriptions ?

If so, could Steffen give more expert details information ?

Thanks.

> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  kernel/padata.c |   20 ++++----------------
>  1 files changed, 4 insertions(+), 16 deletions(-)
> 
> diff --git a/kernel/padata.c b/kernel/padata.c
> index 072f4ee..2f0037a 100644
> --- a/kernel/padata.c
> +++ b/kernel/padata.c
> @@ -846,6 +846,8 @@ static int padata_cpu_callback(struct notifier_block *nfb,
>  	switch (action) {
>  	case CPU_ONLINE:
>  	case CPU_ONLINE_FROZEN:
> +	case CPU_DOWN_FAILED:
> +	case CPU_DOWN_FAILED_FROZEN:
>  		if (!pinst_has_cpu(pinst, cpu))
>  			break;
>  		mutex_lock(&pinst->lock);
> @@ -857,6 +859,8 @@ static int padata_cpu_callback(struct notifier_block *nfb,
>  
>  	case CPU_DOWN_PREPARE:
>  	case CPU_DOWN_PREPARE_FROZEN:
> +	case CPU_UP_CANCELED:
> +	case CPU_UP_CANCELED_FROZEN:
>  		if (!pinst_has_cpu(pinst, cpu))
>  			break;
>  		mutex_lock(&pinst->lock);
> @@ -865,22 +869,6 @@ static int padata_cpu_callback(struct notifier_block *nfb,
>  		if (err)
>  			return notifier_from_errno(err);
>  		break;
> -
> -	case CPU_UP_CANCELED:
> -	case CPU_UP_CANCELED_FROZEN:
> -		if (!pinst_has_cpu(pinst, cpu))
> -			break;
> -		mutex_lock(&pinst->lock);
> -		__padata_remove_cpu(pinst, cpu);
> -		mutex_unlock(&pinst->lock);
> -
> -	case CPU_DOWN_FAILED:
> -	case CPU_DOWN_FAILED_FROZEN:
> -		if (!pinst_has_cpu(pinst, cpu))
> -			break;
> -		mutex_lock(&pinst->lock);
> -		__padata_add_cpu(pinst, cpu);
> -		mutex_unlock(&pinst->lock);
>  	}
>  
>  	return NOTIFY_OK;
> 


-- 
Chen Gang
--
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