Merge HEAD from ../linux-2.6

1 files changed, 16 insertions, 6 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 954981b14303..b21869a39f0b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -330,9 +330,19 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
         int err;
         struct vm_area_struct *first, *vma, *prev;
 
-        /* Clear the LRU lists so pages can be isolated */
-        if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
+        if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {
+                /* Must have swap device for migration */
+                if (nr_swap_pages <= 0)
+                        return ERR_PTR(-ENODEV);
+
+                /*
+                 * Clear the LRU lists so pages can be isolated.
+                 * Note that pages may be moved off the LRU after we have
+                 * drained them. Those pages will fail to migrate like other
+                 * pages that may be busy.
+                 */
                 lru_add_drain_all();
+        }
 
         first = find_vma(mm, start);
         if (!first)
@@ -748,7 +758,7 @@ long do_mbind(unsigned long start, unsigned long len,
                                       MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
             || mode > MPOL_MAX)
                 return -EINVAL;
-        if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_RESOURCE))
+        if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE))
                 return -EPERM;
 
         if (start & ~PAGE_MASK)
@@ -942,20 +952,20 @@ asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode,
          */
         if ((current->euid != task->suid) && (current->euid != task->uid) &&
             (current->uid != task->suid) && (current->uid != task->uid) &&
-            !capable(CAP_SYS_ADMIN)) {
+            !capable(CAP_SYS_NICE)) {
                 err = -EPERM;
                 goto out;
         }
 
         task_nodes = cpuset_mems_allowed(task);
         /* Is the user allowed to access the target nodes? */
-        if (!nodes_subset(new, task_nodes) && !capable(CAP_SYS_ADMIN)) {
+        if (!nodes_subset(new, task_nodes) && !capable(CAP_SYS_NICE)) {
                 err = -EPERM;
                 goto out;
         }
 
         err = do_migrate_pages(mm, &old, &new,
-                capable(CAP_SYS_ADMIN) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE);
+                capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE);
 out:
         mmput(mm);
         return err;