compiler: introduce __used and __maybe_unused

[powerpc.git] / mm / mempolicy.c

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 259a706..d76e8eb 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -144,7 +144,7 @@ static struct zonelist *bind_zonelist(nodemask_t *nodes)
        max++;                  /* space for zlcache_ptr (see mmzone.h) */
        zl = kmalloc(sizeof(struct zone *) * max, GFP_KERNEL);
        if (!zl)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
        zl->zlcache_ptr = NULL;
        num = 0;
        /* First put in the highest zones from all nodes, then all the next 
@@ -162,6 +162,10 @@ static struct zonelist *bind_zonelist(nodemask_t *nodes)
                        break;
                k--;
        }
+       if (num == 0) {
+               kfree(zl);
+               return ERR_PTR(-EINVAL);
+       }
        zl->zones[num] = NULL;
        return zl;
 }
@@ -193,9 +197,10 @@ static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
                break;
        case MPOL_BIND:
                policy->v.zonelist = bind_zonelist(nodes);
-               if (policy->v.zonelist == NULL) {
+               if (IS_ERR(policy->v.zonelist)) {
+                       void *error_code = policy->v.zonelist;
                        kmem_cache_free(policy_cache, policy);
-                       return ERR_PTR(-ENOMEM);
+                       return error_code;
                }
                break;
        }
@@ -316,15 +321,6 @@ static inline int check_pgd_range(struct vm_area_struct *vma,
        return 0;
 }
 
-/* Check if a vma is migratable */
-static inline int vma_migratable(struct vm_area_struct *vma)
-{
-       if (vma->vm_flags & (
-               VM_LOCKED|VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
-               return 0;
-       return 1;
-}
-
 /*
  * Check if all pages in a range are on a set of nodes.
  * If pagelist != NULL then isolate pages from the LRU and
@@ -1667,7 +1663,7 @@ void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *newmask)
                 * then zonelist_policy() will "FALL THROUGH" to MPOL_DEFAULT.
                 */
 
-               if (zonelist) {
+               if (!IS_ERR(zonelist)) {
                        /* Good - got mem - substitute new zonelist */
                        kfree(pol->v.zonelist);
                        pol->v.zonelist = zonelist;