[PATCH] Fix sys_migrate_pages: Move all pages when invoked from root

Currently sys_migrate_pages only moves pages belonging to a process.  This
is okay when invoked from a regular user.  But if invoked from root it
should move all pages as documented in the migrate_pages manpage.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 67af4ce..5643cfe 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -954,7 +954,8 @@ asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode,
                goto out;
        }
 
-       err = do_migrate_pages(mm, &old, &new, MPOL_MF_MOVE);
+       err = do_migrate_pages(mm, &old, &new,
+               capable(CAP_SYS_ADMIN) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE);
 out:
        mmput(mm);
        return err;