tree: https://github.com/krzk/linux n/nfc-debug-cleanups head: dbe5edac004defef47a57b386da49028e5409519 commit: b62f625ba810cda9ce18ab67d332b030ce372129 [5/15] nfc: pn533: drop unneeded debug prints config: nds32-randconfig-r012-20210906 (attached as .config) compiler: nds32le-linux-gcc (GCC) 11.2.0 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 # https://github.com/krzk/linux/commit/b62f625ba810cda9ce18ab67d332b030ce372129 git remote add krzk-github https://github.com/krzk/linux git fetch --no-tags krzk-github n/nfc-debug-cleanups git checkout b62f625ba810cda9ce18ab67d332b030ce372129 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=nds32 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): drivers/nfc/pn533/i2c.c: In function 'pn533_i2c_irq_thread_fn': >> drivers/nfc/pn533/i2c.c:131:28: warning: variable 'client' set but not used [-Wunused-but-set-variable] 131 | struct i2c_client *client; | ^~~~~~ vim +/client +131 drivers/nfc/pn533/i2c.c dd7bedcd2673e4 Michael Thalmeier 2016-03-25 127 dd7bedcd2673e4 Michael Thalmeier 2016-03-25 128 static irqreturn_t pn533_i2c_irq_thread_fn(int irq, void *data) dd7bedcd2673e4 Michael Thalmeier 2016-03-25 129 { dd7bedcd2673e4 Michael Thalmeier 2016-03-25 130 struct pn533_i2c_phy *phy = data; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 @131 struct i2c_client *client; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 132 struct sk_buff *skb = NULL; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 133 int r; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 134 dd7bedcd2673e4 Michael Thalmeier 2016-03-25 135 if (!phy || irq != phy->i2c_dev->irq) { dd7bedcd2673e4 Michael Thalmeier 2016-03-25 136 WARN_ON_ONCE(1); dd7bedcd2673e4 Michael Thalmeier 2016-03-25 137 return IRQ_NONE; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 138 } dd7bedcd2673e4 Michael Thalmeier 2016-03-25 139 dd7bedcd2673e4 Michael Thalmeier 2016-03-25 140 client = phy->i2c_dev; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 141 dd7bedcd2673e4 Michael Thalmeier 2016-03-25 142 if (phy->hard_fault != 0) dd7bedcd2673e4 Michael Thalmeier 2016-03-25 143 return IRQ_HANDLED; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 144 dd7bedcd2673e4 Michael Thalmeier 2016-03-25 145 r = pn533_i2c_read(phy, &skb); dd7bedcd2673e4 Michael Thalmeier 2016-03-25 146 if (r == -EREMOTEIO) { dd7bedcd2673e4 Michael Thalmeier 2016-03-25 147 phy->hard_fault = r; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 148 dd7bedcd2673e4 Michael Thalmeier 2016-03-25 149 pn533_recv_frame(phy->priv, NULL, -EREMOTEIO); dd7bedcd2673e4 Michael Thalmeier 2016-03-25 150 dd7bedcd2673e4 Michael Thalmeier 2016-03-25 151 return IRQ_HANDLED; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 152 } else if ((r == -ENOMEM) || (r == -EBADMSG) || (r == -EBUSY)) { dd7bedcd2673e4 Michael Thalmeier 2016-03-25 153 return IRQ_HANDLED; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 154 } dd7bedcd2673e4 Michael Thalmeier 2016-03-25 155 30f98489f54e02 Michael Thalmeier 2016-04-21 156 if (!phy->aborted) dd7bedcd2673e4 Michael Thalmeier 2016-03-25 157 pn533_recv_frame(phy->priv, skb, 0); dd7bedcd2673e4 Michael Thalmeier 2016-03-25 158 dd7bedcd2673e4 Michael Thalmeier 2016-03-25 159 return IRQ_HANDLED; dd7bedcd2673e4 Michael Thalmeier 2016-03-25 160 } dd7bedcd2673e4 Michael Thalmeier 2016-03-25 161 :::::: The code at line 131 was first introduced by commit :::::: dd7bedcd2673e4c8957d15d7e6e649fc6fa40206 NFC: pn533: add I2C phy driver :::::: TO: Michael Thalmeier :::::: CC: Samuel Ortiz --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org