linux-kernel - Re: [PATCH v4 7/9] devcg: split single exception copy from dev_exceptions

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Date:	Wed, 30 Jan 2013 20:42:40 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	aris@...hat.com
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Tejun Heo <tj@...nel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH v4 7/9] devcg: split single exception copy from
 dev_exceptions_copy()

Quoting aris@...hat.com (aris@...hat.com):
> This patch is in preparation for hierarchy support
> 
> This patch doesn't introduce any functional changes.
> 
> Acked-by: Tejun Heo <tj@...nel.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Serge Hallyn <serge.hallyn@...onical.com>

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>

> Signed-off-by: Aristeu Rozanski <aris@...hat.com>
> 
> ---
>  security/device_cgroup.c |   18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
> 
> --- github.orig/security/device_cgroup.c	2013-01-29 11:49:16.076677425 -0500
> +++ github/security/device_cgroup.c	2013-01-29 11:49:16.374681863 -0500
> @@ -89,20 +89,30 @@ static int devcgroup_can_attach(struct c
>  	return 0;
>  }
>  
> +static int dev_exception_copy(struct list_head *dest,
> +			      struct dev_exception_item *ex)
> +{
> +	struct dev_exception_item *new;
> +
> +	new = kmemdup(ex, sizeof(*ex), GFP_KERNEL);
> +	if (!new)
> +		return -ENOMEM;
> +	list_add_tail(&new->list, dest);
> +	return 0;
> +}
> +
>  /*
>   * called under devcgroup_mutex
>   */
>  static int dev_exceptions_copy(struct list_head *dest, struct list_head *orig)
>  {
> -	struct dev_exception_item *ex, *tmp, *new;
> +	struct dev_exception_item *ex, *tmp;
>  
>  	lockdep_assert_held(&devcgroup_mutex);
>  
>  	list_for_each_entry(ex, orig, list) {
> -		new = kmemdup(ex, sizeof(*ex), GFP_KERNEL);
> -		if (!new)
> +		if (dev_exception_copy(dest, ex))
>  			goto free_and_exit;
> -		list_add_tail(&new->list, dest);
>  	}
>  
>  	return 0;
> 
> --
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