From: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Date: Wed, 15 Mar 2023 11:31:31 +0000 (+0300)
Subject: mm/slub: fix MAX_ORDER usage in calculate_order()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7a16d7c7619b26e5e9bfc1360de0d02a94f7d9eb;p=linux.git

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 39327e98fce34..32eb6b50fe186 100644
--- 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;