linux-kernel - [PATCH net-next -v5 2/4] page_pool: change BIAS

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Date:   Sat, 9 Oct 2021 17:37:22 +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>, <akpm@...ux-foundation.org>,
        <hawk@...nel.org>, <ilias.apalodimas@...aro.org>,
        <peterz@...radead.org>, <yuzhao@...gle.com>, <jhubbard@...dia.com>,
        <will@...nel.org>, <willy@...radead.org>, <jgg@...pe.ca>,
        <mcroce@...rosoft.com>, <willemb@...gle.com>,
        <cong.wang@...edance.com>, <pabeni@...hat.com>,
        <haokexin@...il.com>, <nogikh@...gle.com>, <elver@...gle.com>,
        <memxor@...il.com>, <vvs@...tuozzo.com>, <linux-mm@...ck.org>,
        <edumazet@...gle.com>, <alexander.duyck@...il.com>,
        <dsahern@...il.com>
Subject: [PATCH net-next -v5 2/4] page_pool: change BIAS_MAX to support incrementing

As the page->pp_frag_count need incrementing for pp page
frag 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 9b60e4301a44..2c643b72ce16 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