netdev - Re: [PATCH v6 net-next 3/5] netns-ipv4: reorganize netns

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Message-ID: <202311040337.CPhnv1CW-lkp@intel.com>
Date: Sat, 4 Nov 2023 04:00:10 +0800
From: kernel test robot <lkp@...el.com>
To: Coco Li <lixiaoyan@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Mubashir Adnan Qureshi <mubashirq@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
	Jonathan Corbet <corbet@....net>, David Ahern <dsahern@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>
Cc: oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
	Chao Wu <wwchao@...gle.com>, Wei Wang <weiwan@...gle.com>,
	Pradeep Nemavat <pnemavat@...gle.com>,
	Coco Li <lixiaoyan@...gle.com>
Subject: Re: [PATCH v6 net-next 3/5] netns-ipv4: reorganize netns_ipv4 fast
 path variables

Hi Coco,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Coco-Li/Documentations-Analyze-heavily-used-Networking-related-structs/20231030-133431
base:   net-next/main
patch link:    https://lore.kernel.org/r/20231030052550.3157719-4-lixiaoyan%40google.com
patch subject: [PATCH v6 net-next 3/5] netns-ipv4: reorganize netns_ipv4 fast path variables
config: i386-randconfig-013-20231101 (https://download.01.org/0day-ci/archive/20231104/202311040337.CPhnv1CW-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231104/202311040337.CPhnv1CW-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311040337.CPhnv1CW-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> net/core/net_namespace.c:1102:20: warning: 'netns_ipv4_struct_check' defined but not used [-Wunused-function]
    1102 | static void __init netns_ipv4_struct_check(void)
         |                    ^~~~~~~~~~~~~~~~~~~~~~~


vim +/netns_ipv4_struct_check +1102 net/core/net_namespace.c

  1101	
> 1102	static void __init netns_ipv4_struct_check(void)
  1103	{
  1104		/* TX readonly hotpath cache lines */
  1105		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1106					      sysctl_tcp_early_retrans);
  1107		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1108					      sysctl_tcp_tso_win_divisor);
  1109		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1110					      sysctl_tcp_tso_rtt_log);
  1111		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1112					      sysctl_tcp_autocorking);
  1113		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1114					      sysctl_tcp_min_snd_mss);
  1115		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1116					      sysctl_tcp_notsent_lowat);
  1117		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1118					      sysctl_tcp_limit_output_bytes);
  1119		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1120					      sysctl_tcp_min_rtt_wlen);
  1121		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1122					      sysctl_tcp_wmem);
  1123		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_tx,
  1124					      sysctl_ip_fwd_use_pmtu);
  1125		CACHELINE_ASSERT_GROUP_SIZE(struct netns_ipv4, netns_ipv4_read_tx, 33);
  1126	
  1127		/* TXRX readonly hotpath cache lines */
  1128		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_txrx,
  1129					      sysctl_tcp_moderate_rcvbuf);
  1130		CACHELINE_ASSERT_GROUP_SIZE(struct netns_ipv4, netns_ipv4_read_txrx, 1);
  1131	
  1132		/* RX readonly hotpath cache line */
  1133		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_rx,
  1134					      sysctl_ip_early_demux);
  1135		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_rx,
  1136					      sysctl_tcp_early_demux);
  1137		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_rx,
  1138					      sysctl_tcp_reordering);
  1139		CACHELINE_ASSERT_GROUP_MEMBER(struct netns_ipv4, netns_ipv4_read_rx,
  1140					      sysctl_tcp_rmem);
  1141		CACHELINE_ASSERT_GROUP_SIZE(struct netns_ipv4, netns_ipv4_read_rx, 18);
  1142	}
  1143	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki