linux-kernel - [PATCH 01/10] sparc/mm: Fix MAX_ORDER usage in tsb

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Date:   Wed, 15 Mar 2023 14:31:24 +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>,
        sparclinux@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: [PATCH 01/10] sparc/mm: Fix MAX_ORDER usage in tsb_grow()

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

Fix MAX_ORDER usage in tsb_grow().

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: sparclinux@...r.kernel.org
Cc: David Miller <davem@...emloft.net>
---
 arch/sparc/mm/tsb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c
index 912205787161..dba8dffe2113 100644
--- a/arch/sparc/mm/tsb.c
+++ b/arch/sparc/mm/tsb.c
@@ -402,8 +402,8 @@ void tsb_grow(struct mm_struct *mm, unsigned long tsb_index, unsigned long rss)
 	unsigned long new_rss_limit;
 	gfp_t gfp_flags;
 
-	if (max_tsb_size > (PAGE_SIZE << MAX_ORDER))
-		max_tsb_size = (PAGE_SIZE << MAX_ORDER);
+	if (max_tsb_size > (PAGE_SIZE << (MAX_ORDER - 1)))
+		max_tsb_size = (PAGE_SIZE << (MAX_ORDER - 1));
 
 	new_cache_index = 0;
 	for (new_size = 8192; new_size < max_tsb_size; new_size <<= 1UL) {
-- 
2.39.2