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SubjectRe: [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@hp.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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