[PATCH] Page migration: Fix vma flag checking

Currently we do not check for vma flags if sys_move_pages is called to move
individual pages.  If sys_migrate_pages is called to move pages then we
check for vm_flags that indicate a non migratable vma but that still
includes VM_LOCKED and we can migrate mlocked pages.

Extract the vma_migratable check from mm/mempolicy.c, fix it and put it
into migrate.h so that is can be used from both locations.

Problem was spotted by Lee Schermerhorn

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index e9b161bde95b..7a66ca25dc8a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -781,7 +781,7 @@ static int do_move_pages(struct mm_struct *mm, struct page_to_node *pm,
 
                 err = -EFAULT;
                 vma = find_vma(mm, pp->addr);
-                if (!vma)
+                if (!vma || !vma_migratable(vma))
                         goto set_status;
 
                 page = follow_page(vma, pp->addr, FOLL_GET);