mm/slub: fix MAX_ORDER usage in calculate_order()

MAX_ORDER is not inclusive: the maximum allocation order buddy allocator
can deliver is MAX_ORDER-1.

Fix MAX_ORDER usage in calculate_order().

Link: https://lkml.kernel.org/r/20230315113133.11326-9-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/slub.c b/mm/slub.c
index 39327e9..32eb6b5 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4171,7 +4171,7 @@ static inline int calculate_order(unsigned int size)
        /*
         * Doh this slab cannot be placed using slub_max_order.
         */
-       order = calc_slab_order(size, 1, MAX_ORDER, 1);
+       order = calc_slab_order(size, 1, MAX_ORDER - 1, 1);
        if (order < MAX_ORDER)
                return order;
        return -ENOSYS;