netdev - [PATCH net-next 4/7] page_pool: change BIAS

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Date:   Wed, 22 Sep 2021 17:41:28 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...neuler.org>, <hawk@...nel.org>,
        <ilias.apalodimas@...aro.org>, <jonathan.lemon@...il.com>,
        <alobakin@...me>, <willemb@...gle.com>, <cong.wang@...edance.com>,
        <pabeni@...hat.com>, <haokexin@...il.com>, <nogikh@...gle.com>,
        <elver@...gle.com>, <memxor@...il.com>, <edumazet@...gle.com>,
        <alexander.duyck@...il.com>, <dsahern@...il.com>
Subject: [PATCH net-next 4/7] page_pool: change BIAS_MAX to support incrementing

As the page->pp_frag_count need incrementing for pp page
tracking support, so change BIAS_MAX to (LONG_MAX / 2) to
avoid overflowing.

Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
---
 net/core/page_pool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 357fb53343a0..e9516477f9d2 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -24,7 +24,7 @@
 #define DEFER_TIME (msecs_to_jiffies(1000))
 #define DEFER_WARN_INTERVAL (60 * HZ)
 
-#define BIAS_MAX	LONG_MAX
+#define BIAS_MAX	(LONG_MAX / 2)
 
 static int page_pool_init(struct page_pool *pool,
 			  const struct page_pool_params *params)
-- 
2.33.0