linux-kernel - [PATCH 08/10] mm/slub: Fix MAX_ORDER usage in calculate

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Date:   Wed, 15 Mar 2023 14:31:31 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        David Hildenbrand <david@...hat.com>
Cc:     linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>
Subject: [PATCH 08/10] 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().

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Pekka Enberg <penberg@...nel.org>
---
 mm/slub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/slub.c b/mm/slub.c
index 39327e98fce3..32eb6b50fe18 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;
-- 
2.39.2