linux-kernel - Re: [PATCH net-next v22 2/2] mctp pcc: Implement MCTP over PCC Transport

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Message-ID: <202507111843.OV6uA3Jr-lkp@intel.com>
Date: Fri, 11 Jul 2025 19:02:47 +0800
From: kernel test robot <lkp@...el.com>
To: admiyo@...amperecomputing.com, Jeremy Kerr <jk@...econstruct.com.au>,
	Matt Johnston <matt@...econstruct.com.au>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Sudeep Holla <sudeep.holla@....com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Huisong Li <lihuisong@...wei.com>
Subject: Re: [PATCH net-next v22 2/2] mctp pcc: Implement MCTP over PCC
 Transport

Hi,

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/admiyo-os-amperecomputing-com/mailbox-pcc-support-mailbox-management-of-the-shared-buffer/20250711-031525
base:   net-next/main
patch link:    https://lore.kernel.org/r/20250710191209.737167-3-admiyo%40os.amperecomputing.com
patch subject: [PATCH net-next v22 2/2] mctp pcc: Implement MCTP over PCC Transport
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20250711/202507111843.OV6uA3Jr-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250711/202507111843.OV6uA3Jr-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/202507111843.OV6uA3Jr-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/net/mctp/mctp-pcc.c:71:8: warning: variable 'skb_buf' set but not used [-Wunused-but-set-variable]
      71 |         void *skb_buf;
         |               ^
   1 warning generated.


vim +/skb_buf +71 drivers/net/mctp/mctp-pcc.c

    65	
    66	static void *mctp_pcc_rx_alloc(struct mbox_client *c, int size)
    67	{
    68		struct mctp_pcc_mailbox *box;
    69		struct mctp_pcc_ndev *mctp_pcc_ndev;
    70		struct sk_buff *skb;
  > 71		void *skb_buf;
    72	
    73		box = container_of(c, struct mctp_pcc_mailbox, client);
    74		mctp_pcc_ndev = container_of(c, struct mctp_pcc_ndev, inbox.client);
    75		if (size > mctp_pcc_ndev->mdev.dev->mtu)
    76			return NULL;
    77		mctp_pcc_ndev = container_of(c, struct mctp_pcc_ndev, inbox.client);
    78		skb = netdev_alloc_skb(mctp_pcc_ndev->mdev.dev, size);
    79		if (!skb)
    80			return NULL;
    81		skb_buf = skb_put(skb, size);
    82		skb->protocol = htons(ETH_P_MCTP);
    83	
    84		skb_queue_head(&box->packets, skb);
    85	
    86		return skb->data;
    87	}
    88	

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