linux-kernel - Re: [PATCH 05/30] nsproxy: add create

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Date:	Fri, 10 Apr 2009 17:33:18 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	akpm@...ux-foundation.org, containers@...ts.linux-foundation.org,
	xemul@...allels.com, dave@...ux.vnet.ibm.com, mingo@...e.hu,
	orenl@...columbia.edu, hch@...radead.org,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/30] nsproxy: add create_nsproxy()

Quoting Alexey Dobriyan (adobriyan@...il.com):
> clone_nsproxy() does useless copying of old nsproxy -- every pointer
> will be rewritten to new ns or to old ns.
> 
> Remove copying, rename clone_nsproxy(), it will be used by C/R code
> to create fresh nsproxy on restart.
> 
> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>

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

> ---
> 
>  kernel/nsproxy.c |   19 +++++++------------
>  1 file changed, 7 insertions(+), 12 deletions(-)
> 
> --- a/kernel/nsproxy.c
> +++ b/kernel/nsproxy.c
> @@ -26,19 +26,14 @@ static struct kmem_cache *nsproxy_cachep;
> 
>  struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy);
> 
> -/*
> - * creates a copy of "orig" with refcount 1.
> - */
> -static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig)
> +static inline struct nsproxy *create_nsproxy(void)
>  {
> -	struct nsproxy *ns;
> +	struct nsproxy *nsproxy;
> 
> -	ns = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
> -	if (ns) {
> -		memcpy(ns, orig, sizeof(struct nsproxy));
> -		atomic_set(&ns->count, 1);
> -	}
> -	return ns;
> +	nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
> +	if (nsproxy)
> +		atomic_set(&nsproxy->count, 1);
> +	return nsproxy;
>  }
> 
>  /*
> @@ -52,7 +47,7 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
>  	struct nsproxy *new_nsp;
>  	int err;
> 
> -	new_nsp = clone_nsproxy(tsk->nsproxy);
> +	new_nsp = create_nsproxy();
>  	if (!new_nsp)
>  		return ERR_PTR(-ENOMEM);
--
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