linux-kernel - Re: [PATCH 2/2] pidns 2/2: rewrite copy_pid_ns()

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Message-ID: <20090508191922.GB28885@us.ibm.com>
Date:	Fri, 8 May 2009 14:19:22 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	akpm@...ux-foundation.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, xemul@...allels.com
Subject: Re: [PATCH 2/2] pidns 2/2: rewrite copy_pid_ns()

Quoting Alexey Dobriyan (adobriyan@...il.com):
> copy_pid_ns() is a perfect example of a case where unwinding leads to more
> code and makes it less clear. Watch the diffstat.
> 
> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>

Nice.

Reviewed-by: Serge Hallyn <serue@...ibm.com>

thanks,
-serge

> ---
>  kernel/pid_namespace.c |   18 +++---------------
>  1 files changed, 3 insertions(+), 15 deletions(-)
> 
> diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
> index 495d5de..821722a 100644
> --- a/kernel/pid_namespace.c
> +++ b/kernel/pid_namespace.c
> @@ -116,23 +116,11 @@ static void destroy_pid_namespace(struct pid_namespace *ns)
> 
>  struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *old_ns)
>  {
> -	struct pid_namespace *new_ns;
> -
> -	BUG_ON(!old_ns);
> -	new_ns = get_pid_ns(old_ns);
>  	if (!(flags & CLONE_NEWPID))
> -		goto out;
> -
> -	new_ns = ERR_PTR(-EINVAL);
> +		return get_pid_ns(old_ns);
>  	if (flags & CLONE_THREAD)
> -		goto out_put;
> -
> -	new_ns = create_pid_namespace(old_ns);
> -
> -out_put:
> -	put_pid_ns(old_ns);
> -out:
> -	return new_ns;
> +		return ERR_PTR(-EINVAL);
> +	return create_pid_namespace(old_ns);
>  }
> 
>  void free_pid_ns(struct kref *kref)
> _______________________________________________
> Containers mailing list
> Containers@...ts.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/containers
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