SLUB: Tread Hugepages as GFP_MOVABLE pages

Do the same as hugetlb.c does: If the page order for a slab has been
set to the same order as hugetlb pages then use GFP_MOVABLE as an
allocation flag. This has the effect that

	slub_min_order=HUGE_ORDER

will avoid creating any RECLAIMABLE sections at all. The system
will only have MOVABLE and UNMOVABLE sections.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 mm/slub.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c	2008-01-09 23:56:10.511522745 -0800
+++ linux-2.6/mm/slub.c	2008-01-10 00:02:39.693136822 -0800
@@ -2372,6 +2372,11 @@ static int kmem_cache_open(struct kmem_c
 	if (s->flags & SLAB_CACHE_DMA)
 		s->allocflags |= SLUB_DMA;
 
+#ifdef CONFIG_HUGETLBFS
+	if (s->order == HPAGE_SHIFT - PAGE_SHIFT)
+		s->allocflags |= __GFP_MOVABLE;
+	else
+#endif
 	if (s->flags & SLAB_RECLAIM_ACCOUNT)
 		s->allocflags |= __GFP_RECLAIMABLE;