linux-kernel - Re: [patch 3/4] mempolicy: add MPOL_F_STATIC

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Date:	Tue, 12 Feb 2008 16:57:01 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Jackson <pj@....com>,
	Christoph Lameter <clameter@....com>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 3/4] mempolicy: add MPOL_F_STATIC_NODES flag

On Tue, 12 Feb 2008, Lee Schermerhorn wrote:

> PATCH mempolicy - consolidate mpol_new() error paths
> 
> Use common error path in mpol_new() for errors that we discover
> after allocation the new mempolicy structure.  Free the mempolicy
> in the common error path.
> 
> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@...com>
> 
>  mm/mempolicy.c |   16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
> 
> Index: Linux/mm/mempolicy.c
> ===================================================================
> --- Linux.orig/mm/mempolicy.c	2008-02-12 15:18:12.000000000 -0700
> +++ Linux/mm/mempolicy.c	2008-02-12 15:22:07.000000000 -0700
> @@ -156,6 +156,7 @@ static struct mempolicy *mpol_new(enum m
>  {
>  	struct mempolicy *policy;
>  	nodemask_t cpuset_context_nmask;
> +	void *error_code = ERR_PTR(-EINVAL);
>  
>  	pr_debug("setting mode %d flags %d nodes[0] %lx\n",
>  		 mode, flags, nodes ? nodes_addr(*nodes)[0] : -1);
> @@ -172,8 +173,7 @@ static struct mempolicy *mpol_new(enum m
>  	switch (mode) {
>  	case MPOL_INTERLEAVE:
>  		if (nodes_empty(*nodes) || nodes_empty(cpuset_context_nmask)) {
> -			kmem_cache_free(policy_cache, policy);
> -			return ERR_PTR(-EINVAL);
> +			goto free_mpol;
>  		}
>  		policy->v.nodes = cpuset_context_nmask;
>  		break;

You can also get rid of the parentheses to make checkpatch.pl happy, too.

> @@ -184,14 +184,12 @@ static struct mempolicy *mpol_new(enum m
>  		break;
>  	case MPOL_BIND:
>  		if (nodes_empty(*nodes)) {
> -			kmem_cache_free(policy_cache, policy);
> -			return ERR_PTR(-EINVAL);
> +			goto free_mpol;
>  		}
>  		policy->v.zonelist = bind_zonelist(&cpuset_context_nmask);
>  		if (IS_ERR(policy->v.zonelist)) {
> -			void *error_code = policy->v.zonelist;
> -			kmem_cache_free(policy_cache, policy);
> -			return error_code;
> +			error_code = policy->v.zonelist;
> +			goto free_mpol;
>  		}
>  		break;
>  	default:
> @@ -201,6 +199,10 @@ static struct mempolicy *mpol_new(enum m
>  	policy->cpuset_mems_allowed = cpuset_mems_allowed(current);
>  	policy->user_nodemask = *nodes;
>  	return policy;
> +
> +free_mpol:
> +	kmem_cache_free(policy_cache, policy);
> +	return error_code;
>  }
>  
>  static void gather_stats(struct page *, void *, int pte_dirty);
> 

I'll fold this into my patchset when I repost it, thanks.

		David
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