memory controller BUG_ON()

[safe/jmp/linux-2.6] / mm / mempolicy.c

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 568152a..83c69f8 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -78,6 +78,7 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/module.h>
+#include <linux/nsproxy.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/compat.h>
@@ -721,12 +722,29 @@ out:
 
 }
 
+/*
+ * Allocate a new page for page migration based on vma policy.
+ * Start assuming that page is mapped by vma pointed to by @private.
+ * Search forward from there, if not.  N.B., this assumes that the
+ * list of pages handed to migrate_pages()--which is how we get here--
+ * is in virtual address order.
+ */
 static struct page *new_vma_page(struct page *page, unsigned long private, int **x)
 {
        struct vm_area_struct *vma = (struct vm_area_struct *)private;
+       unsigned long uninitialized_var(address);
+
+       while (vma) {
+               address = page_address_in_vma(page, vma);
+               if (address != -EFAULT)
+                       break;
+               vma = vma->vm_next;
+       }
 
-       return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma,
-                                       page_address_in_vma(page, vma));
+       /*
+        * if !vma, alloc_page_vma() will use task or system default policy
+        */
+       return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
 }
 #else
 
@@ -940,7 +958,7 @@ asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode,
 
        /* Find the mm_struct */
        read_lock(&tasklist_lock);
-       task = pid ? find_task_by_pid(pid) : current;
+       task = pid ? find_task_by_vpid(pid) : current;
        if (!task) {
                read_unlock(&tasklist_lock);
                return -ESRCH;
@@ -1388,7 +1406,6 @@ EXPORT_SYMBOL(alloc_pages_current);
  * keeps mempolicies cpuset relative after its cpuset moves.  See
  * further kernel/cpuset.c update_nodemask().
  */
-void *cpuset_being_rebound;
 
 /* Slow path of a mempolicy copy */
 struct mempolicy *__mpol_copy(struct mempolicy *old)
@@ -2019,4 +2036,3 @@ out:
                m->version = (vma != priv->tail_vma) ? vma->vm_start : 0;
        return 0;
 }
-