linux-kernel - [PATCH 1/3] memblock: Make a boundary tighter in memblock_add

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Date:   Fri, 13 Jan 2023 16:26:57 +0800
From:   Peng Zhang <zhangpeng.00@...edance.com>
To:     rppt@...nel.org, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Peng Zhang <zhangpeng.00@...edance.com>
Subject: [PATCH 1/3] memblock: Make a boundary tighter in memblock_add_range().

When type->cnt * 2 + 1 is less than or equal to type->max, there is
enough empty regions to insert.

Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>
---
 mm/memblock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index 511d4783dcf1..6eedcfc5dcc1 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -601,11 +601,11 @@ static int __init_memblock memblock_add_range(struct memblock_type *type,
 	/*
 	 * The worst case is when new range overlaps all existing regions,
 	 * then we'll need type->cnt + 1 empty regions in @type. So if
-	 * type->cnt * 2 + 1 is less than type->max, we know
+	 * type->cnt * 2 + 1 is less than or equal to type->max, we know
 	 * that there is enough empty regions in @type, and we can insert
 	 * regions directly.
 	 */
-	if (type->cnt * 2 + 1 < type->max)
+	if (type->cnt * 2 + 1 <= type->max)
 		insert = true;
 
 repeat:
-- 
2.20.1