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Date:   Tue, 9 May 2023 17:25:21 +0800
From:   kernel test robot <lkp@intel.com>
To:     Florian Fainelli <f.fainelli@gmail.com>, netdev@vger.kernel.org
Cc:     llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
        Florian Fainelli <f.fainelli@gmail.com>,
        Doug Berger <opendmb@gmail.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@broadcom.com>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Marek =?iso-8859-1?Q?Beh=FAn?= <kabel@kernel.org>,
        Peter Geis <pgwipeout@gmail.com>,
        Frank <Frank.Sae@motor-comm.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next 2/3] net: phy: broadcom: Add support for
 Wake-on-LAN
Message-ID: <202305091725.uiFVrVZR-lkp@intel.com>
References: <20230508184309.1628108-3-f.fainelli@gmail.com>
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In-Reply-To: <20230508184309.1628108-3-f.fainelli@gmail.com>
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Hi Florian,

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/Florian-Fainelli/net-phy-Let-drivers-check-Wake-on-LAN-status/20230509-024405
base:   net-next/main
patch link:    https://lore.kernel.org/r/20230508184309.1628108-3-f.fainelli%40gmail.com
patch subject: [PATCH net-next 2/3] net: phy: broadcom: Add support for Wake-on-LAN
config: s390-randconfig-r036-20230508 (https://download.01.org/0day-ci/archive/20230509/202305091725.uiFVrVZR-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project b0fb98227c90adf2536c9ad644a74d5e92961111)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/9bc5e73961748471e3dae79cb94f329382a6d490
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Florian-Fainelli/net-phy-Let-drivers-check-Wake-on-LAN-status/20230509-024405
        git checkout 9bc5e73961748471e3dae79cb94f329382a6d490
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/net/phy/ kernel/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305091725.uiFVrVZR-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/net/phy/broadcom.c:13:
   In file included from drivers/net/phy/bcm-phy-lib.h:9:
   In file included from include/linux/brcmphy.h:5:
   In file included from include/linux/phy.h:16:
   In file included from include/linux/ethtool.h:18:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:28:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                                                             ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
   #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
                                                        ^
   In file included from drivers/net/phy/broadcom.c:13:
   In file included from drivers/net/phy/bcm-phy-lib.h:9:
   In file included from include/linux/brcmphy.h:5:
   In file included from include/linux/phy.h:16:
   In file included from include/linux/ethtool.h:18:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:28:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
   #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
                                                        ^
   In file included from drivers/net/phy/broadcom.c:13:
   In file included from drivers/net/phy/bcm-phy-lib.h:9:
   In file included from include/linux/brcmphy.h:5:
   In file included from include/linux/phy.h:16:
   In file included from include/linux/ethtool.h:18:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:28:
   In file included from include/linux/dma-mapping.h:10:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
>> drivers/net/phy/broadcom.c:471:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (priv->wake_irq_enabled != state) {
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/phy/broadcom.c:479:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/net/phy/broadcom.c:471:2: note: remove the 'if' if its condition is always true
           if (priv->wake_irq_enabled != state) {
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/net/phy/broadcom.c:466:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   13 warnings generated.


vim +471 drivers/net/phy/broadcom.c

   462	
   463	static int bcm54xx_set_wakeup_irq(struct phy_device *phydev, bool state)
   464	{
   465		struct bcm54xx_phy_priv *priv = phydev->priv;
   466		int ret;
   467	
   468		if (!bcm54xx_phy_can_wakeup(phydev))
   469			return 0;
   470	
 > 471		if (priv->wake_irq_enabled != state) {
   472			if (state)
   473				ret = enable_irq_wake(priv->wake_irq);
   474			else
   475				ret = disable_irq_wake(priv->wake_irq);
   476			priv->wake_irq_enabled = state;
   477		}
   478	
   479		return ret;
   480	}
   481	

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