netdev - Re: [PATCH net-next v2 07/10] net: dsa: lan9303: Added basic offloading of unicast traffic

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Message-ID: <201707270846.jwq8Z2mo%fengguang.wu@intel.com>
Date:   Thu, 27 Jul 2017 08:17:17 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Egil Hjelmeland <privat@...l-hjelmeland.no>
Cc:     kbuild-all@...org, corbet@....net, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        davem@...emloft.net, kernel@...gutronix.de,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Egil Hjelmeland <privat@...l-hjelmeland.no>
Subject: Re: [PATCH net-next v2 07/10] net: dsa: lan9303: Added basic
 offloading of unicast traffic

Hi Egil,

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

url:    https://github.com/0day-ci/linux/commits/Egil-Hjelmeland/net-dsa-lan9303-unicast-offload-fdb-mdb-STP/20170727-074246
config: x86_64-randconfig-x000-201730 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/net//dsa/lan9303-core.c: In function 'lan9303_port_stp_state_set':
>> drivers/net//dsa/lan9303-core.c:945:16: warning: 'portstate' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int portmask, portstate;
                   ^~~~~~~~~

vim +/portstate +945 drivers/net//dsa/lan9303-core.c

   941	
   942	static void lan9303_port_stp_state_set(struct dsa_switch *ds, int port,
   943					       u8 state)
   944	{
 > 945		int portmask, portstate;
   946		struct lan9303 *chip = ds->priv;
   947	
   948		dev_dbg(chip->dev, "%s(port %d, state %d)\n",
   949			__func__, port, state);
   950		if (!chip->is_bridged)
   951			return;
   952	
   953		switch (state) {
   954		case BR_STATE_DISABLED:
   955			portstate = LAN9303_SWE_PORT_STATE_DISABLED_PORT0;
   956			break;
   957		case BR_STATE_BLOCKING:
   958		case BR_STATE_LISTENING:
   959			portstate = LAN9303_SWE_PORT_STATE_BLOCKING_PORT0;
   960			break;
   961		case BR_STATE_LEARNING:
   962			portstate = LAN9303_SWE_PORT_STATE_LEARNING_PORT0;
   963			break;
   964		case BR_STATE_FORWARDING:
   965			portstate = LAN9303_SWE_PORT_STATE_FORWARDING_PORT0;
   966			break;
   967		default:
   968			dev_err(chip->dev, "%s(port %d, state %d)\n",
   969				__func__, port, state);
   970		}
   971		portmask = 0x3 << (port * 2);
   972		portstate     <<= (port * 2);
   973		lan9303_write_switch_reg_mask(chip, LAN9303_SWE_PORT_STATE,
   974					      portstate, portmask);
   975	}
   976	

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