[PATCH] migration: make sure there is no attempt to migrate reserved pages.

This ensures that reserved pages are not migrated.  Reserved pages
currently cause the WARN_ON to trigger in migrate_page_add()

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 1850d0aef4ac..b62cab575a84 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -208,6 +208,8 @@ static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
                 page = vm_normal_page(vma, addr, *pte);
                 if (!page)
                         continue;
+                if (PageReserved(page))
+                        continue;
                 nid = page_to_nid(page);
                 if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
                         continue;
@@ -290,7 +292,7 @@ static inline int check_pgd_range(struct vm_area_struct *vma,
 static inline int vma_migratable(struct vm_area_struct *vma)
 {
         if (vma->vm_flags & (
-                VM_LOCKED|VM_IO|VM_HUGETLB|VM_PFNMAP))
+                VM_LOCKED|VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
                 return 0;
         return 1;
 }