[PATCH] Add tmpfs options for memory placement policies

[pandora-kernel.git] / mm / mempolicy.c

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index b62cab5..3171f88 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1359,6 +1359,30 @@ restart:
        return 0;
 }
 
+void mpol_shared_policy_init(struct shared_policy *info, int policy,
+                               nodemask_t *policy_nodes)
+{
+       info->root = RB_ROOT;
+       spin_lock_init(&info->lock);
+
+       if (policy != MPOL_DEFAULT) {
+               struct mempolicy *newpol;
+
+               /* Falls back to MPOL_DEFAULT on any error */
+               newpol = mpol_new(policy, policy_nodes);
+               if (!IS_ERR(newpol)) {
+                       /* Create pseudo-vma that contains just the policy */
+                       struct vm_area_struct pvma;
+
+                       memset(&pvma, 0, sizeof(struct vm_area_struct));
+                       /* Policy covers entire file */
+                       pvma.vm_end = TASK_SIZE;
+                       mpol_set_shared_policy(info, &pvma, newpol);
+                       mpol_free(newpol);
+               }
+       }
+}
+
 int mpol_set_shared_policy(struct shared_policy *info,
                        struct vm_area_struct *vma, struct mempolicy *npol)
 {