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-rw-r--r--mm/mempolicy.c61
1 files changed, 36 insertions, 25 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 83c69f8..8d246c3 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -116,22 +116,51 @@ static void mpol_rebind_policy(struct mempolicy *pol,
/* Do sanity checking on a policy */
static int mpol_check_policy(int mode, nodemask_t *nodes)
{
- int empty = nodes_empty(*nodes);
+ int was_empty, is_empty;
+
+ if (!nodes)
+ return 0;
+
+ /*
+ * "Contextualize" the in-coming nodemast for cpusets:
+ * Remember whether in-coming nodemask was empty, If not,
+ * restrict the nodes to the allowed nodes in the cpuset.
+ * This is guaranteed to be a subset of nodes with memory.
+ */
+ cpuset_update_task_memory_state();
+ is_empty = was_empty = nodes_empty(*nodes);
+ if (!was_empty) {
+ nodes_and(*nodes, *nodes, cpuset_current_mems_allowed);
+ is_empty = nodes_empty(*nodes); /* after "contextualization" */
+ }
switch (mode) {
case MPOL_DEFAULT:
- if (!empty)
+ /*
+ * require caller to specify an empty nodemask
+ * before "contextualization"
+ */
+ if (!was_empty)
return -EINVAL;
break;
case MPOL_BIND:
case MPOL_INTERLEAVE:
- /* Preferred will only use the first bit, but allow
- more for now. */
- if (empty)
+ /*
+ * require at least 1 valid node after "contextualization"
+ */
+ if (is_empty)
+ return -EINVAL;
+ break;
+ case MPOL_PREFERRED:
+ /*
+ * Did caller specify invalid nodes?
+ * Don't silently accept this as "local allocation".
+ */
+ if (!was_empty && is_empty)
return -EINVAL;
break;
}
- return nodes_subset(*nodes, node_states[N_HIGH_MEMORY]) ? 0 : -EINVAL;
+ return 0;
}
/* Generate a custom zonelist for the BIND policy. */
@@ -188,8 +217,6 @@ static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
switch (mode) {
case MPOL_INTERLEAVE:
policy->v.nodes = *nodes;
- nodes_and(policy->v.nodes, policy->v.nodes,
- node_states[N_HIGH_MEMORY]);
if (nodes_weight(policy->v.nodes) == 0) {
kmem_cache_free(policy_cache, policy);
return ERR_PTR(-EINVAL);
@@ -421,18 +448,6 @@ static int mbind_range(struct vm_area_struct *vma, unsigned long start,
return err;
}
-static int contextualize_policy(int mode, nodemask_t *nodes)
-{
- if (!nodes)
- return 0;
-
- cpuset_update_task_memory_state();
- if (!cpuset_nodes_subset_current_mems_allowed(*nodes))
- return -EINVAL;
- return mpol_check_policy(mode, nodes);
-}
-
-
/*
* Update task->flags PF_MEMPOLICY bit: set iff non-default
* mempolicy. Allows more rapid checking of this (combined perhaps
@@ -468,7 +483,7 @@ static long do_set_mempolicy(int mode, nodemask_t *nodes)
{
struct mempolicy *new;
- if (contextualize_policy(mode, nodes))
+ if (mpol_check_policy(mode, nodes))
return -EINVAL;
new = mpol_new(mode, nodes);
if (IS_ERR(new))
@@ -915,10 +930,6 @@ asmlinkage long sys_mbind(unsigned long start, unsigned long len,
err = get_nodes(&nodes, nmask, maxnode);
if (err)
return err;
-#ifdef CONFIG_CPUSETS
- /* Restrict the nodes to the allowed nodes in the cpuset */
- nodes_and(nodes, nodes, current->mems_allowed);
-#endif
return do_mbind(start, len, mode, &nodes, flags);
}
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