slub: enforce MAX_ORDER

slub_max_order may not be equal to or greater than MAX_ORDER.

Additionally, if a single object cannot be placed in a slab of
slub_max_order, it still must allocate slabs below MAX_ORDER.

Acked-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

diff --git a/mm/slub.c b/mm/slub.c
index 7ab54ec..0e1247e 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1909,7 +1909,7 @@ static inline int calculate_order(int size)
         * Doh this slab cannot be placed using slub_max_order.
         */
        order = slab_order(size, 1, MAX_ORDER, 1);
-       if (order <= MAX_ORDER)
+       if (order < MAX_ORDER)
                return order;
        return -ENOSYS;
 }
@@ -2522,6 +2522,7 @@ __setup("slub_min_order=", setup_slub_min_order);
 static int __init setup_slub_max_order(char *str)
 {
        get_option(&str, &slub_max_order);
+       slub_max_order = min(slub_max_order, MAX_ORDER - 1);
 
        return 1;
 }