Hi Sean, I love your patch! Yet something to improve: [auto build test ERROR on linuxtv-media/master] [also build test ERROR on v5.8 next-20200813] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Sean-Young/media-gpio-ir-tx-spin... base: git://linuxtv.org/media_tree.git master config: h8300-randconfig-r011-20200813 (attached as .config) compiler: h8300-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/kernel.h:11, from drivers/media/rc/gpio-ir-tx.c:6: include/linux/scatterlist.h: In function 'sg_set_buf': include/asm-generic/page.h:93:50: warning: ordered comparison of pointer with null pointer [-Wextra] 93 | #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ | ^~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON' 143 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~ include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid' 143 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~~~~~~~~~~ In file included from include/linux/seqlock.h:36, from include/linux/time.h:6, from include/linux/stat.h:19, from include/linux/module.h:13, from drivers/media/rc/gpio-ir-tx.c:7: drivers/media/rc/gpio-ir-tx.c: In function 'gpio_ir_tx_probe': 174 | spin_lock_init(&gpio_ir->lock); | ^~ include/linux/spinlock.h:345:17: note: in definition of macro 'spin_lock_init' 345 | spinlock_check(_lock); \ | ^~~~~ 174 | spin_lock_init(&gpio_ir->lock); | ^~ include/linux/spinlock.h:346:4: note: in definition of macro 'spin_lock_init' 346 | *(_lock) = __SPIN_LOCK_UNLOCKED(_lock); \ | ^~~~~ vim +174 drivers/media/rc/gpio-ir-tx.c 24d79ebc6ccec55 Sean Young 2017-07-07 142 24d79ebc6ccec55 Sean Young 2017-07-07 143 static int gpio_ir_tx_probe(struct platform_device *pdev) 24d79ebc6ccec55 Sean Young 2017-07-07 144 { 24d79ebc6ccec55 Sean Young 2017-07-07 145 struct gpio_ir *gpio_ir; 24d79ebc6ccec55 Sean Young 2017-07-07 146 struct rc_dev *rcdev; 24d79ebc6ccec55 Sean Young 2017-07-07 147 int rc; 24d79ebc6ccec55 Sean Young 2017-07-07 148 24d79ebc6ccec55 Sean Young 2017-07-07 149 gpio_ir = devm_kmalloc(&pdev->dev, sizeof(*gpio_ir), GFP_KERNEL); 24d79ebc6ccec55 Sean Young 2017-07-07 150 if (!gpio_ir) 24d79ebc6ccec55 Sean Young 2017-07-07 151 return -ENOMEM; 24d79ebc6ccec55 Sean Young 2017-07-07 152 24d79ebc6ccec55 Sean Young 2017-07-07 153 rcdev = devm_rc_allocate_device(&pdev->dev, RC_DRIVER_IR_RAW_TX); 24d79ebc6ccec55 Sean Young 2017-07-07 154 if (!rcdev) 24d79ebc6ccec55 Sean Young 2017-07-07 155 return -ENOMEM; 24d79ebc6ccec55 Sean Young 2017-07-07 156 24d79ebc6ccec55 Sean Young 2017-07-07 157 gpio_ir->gpio = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW); 24d79ebc6ccec55 Sean Young 2017-07-07 158 if (IS_ERR(gpio_ir->gpio)) { 24d79ebc6ccec55 Sean Young 2017-07-07 159 if (PTR_ERR(gpio_ir->gpio) != -EPROBE_DEFER) 24d79ebc6ccec55 Sean Young 2017-07-07 160 dev_err(&pdev->dev, "Failed to get gpio (%ld)\n", 24d79ebc6ccec55 Sean Young 2017-07-07 161 PTR_ERR(gpio_ir->gpio)); 24d79ebc6ccec55 Sean Young 2017-07-07 162 return PTR_ERR(gpio_ir->gpio); 24d79ebc6ccec55 Sean Young 2017-07-07 163 } 24d79ebc6ccec55 Sean Young 2017-07-07 164 24d79ebc6ccec55 Sean Young 2017-07-07 165 rcdev->priv = gpio_ir; 24d79ebc6ccec55 Sean Young 2017-07-07 166 rcdev->driver_name = DRIVER_NAME; 24d79ebc6ccec55 Sean Young 2017-07-07 167 rcdev->device_name = DEVICE_NAME; 24d79ebc6ccec55 Sean Young 2017-07-07 168 rcdev->tx_ir = gpio_ir_tx; 24d79ebc6ccec55 Sean Young 2017-07-07 169 rcdev->s_tx_duty_cycle = gpio_ir_tx_set_duty_cycle; 24d79ebc6ccec55 Sean Young 2017-07-07 170 rcdev->s_tx_carrier = gpio_ir_tx_set_carrier; 24d79ebc6ccec55 Sean Young 2017-07-07 171 24d79ebc6ccec55 Sean Young 2017-07-07 172 gpio_ir->carrier = 38000; 24d79ebc6ccec55 Sean Young 2017-07-07 173 gpio_ir->duty_cycle = 50; 24d79ebc6ccec55 Sean Young 2017-07-07 @174 spin_lock_init(&gpio_ir->lock); 24d79ebc6ccec55 Sean Young 2017-07-07 175 24d79ebc6ccec55 Sean Young 2017-07-07 176 rc = devm_rc_register_device(&pdev->dev, rcdev); 24d79ebc6ccec55 Sean Young 2017-07-07 177 if (rc < 0) 24d79ebc6ccec55 Sean Young 2017-07-07 178 dev_err(&pdev->dev, "failed to register rc device\n"); 24d79ebc6ccec55 Sean Young 2017-07-07 179 24d79ebc6ccec55 Sean Young 2017-07-07 180 return rc; 24d79ebc6ccec55 Sean Young 2017-07-07 181 } 24d79ebc6ccec55 Sean Young 2017-07-07 182 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org