tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: 5342fd3d769c58688aad5088b77b3c9f44438ef7 commit: e3b73159b8cfd2c940dd6e55702754c16f1f3923 [5/10] mfd: intel-ehl-gpio: Introduce MFD framework to PSE GPIO/TGPIO config: x86_64-randconfig-r026-20210514 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 425781bce01f2f1d5f553d3b2bf9ebbd6e15068c) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/intel/linux-intel-lts/commit/e3b73159b8cfd2c940dd6e557... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/yocto git checkout e3b73159b8cfd2c940dd6e55702754c16f1f3923 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): if (scaled_ppm < 0) { ^~~~~~~~~~~~~~ drivers/ptp/ptp-intel-tgpio-plat.c:247:9: note: uninitialized use occurs here reg |= isgn << 31; ^~~~ drivers/ptp/ptp-intel-tgpio-plat.c:234:2: note: remove the 'if' if its condition is always true if (scaled_ppm < 0) { ^~~~~~~~~~~~~~~~~~~~ drivers/ptp/ptp-intel-tgpio-plat.c:229:13: note: initialize the variable 'isgn' to silence this warning bool isgn; ^ = 0 1 warning generated. vim +234 drivers/ptp/ptp-intel-tgpio-plat.c 223 224 static int intel_tgpio_adjfine(struct ptp_clock_info *info, long scaled_ppm) 225 { 226 struct intel_tgpio *tgpio = to_intel_tgpio(info); 227 unsigned long flags; 228 u32 reg; 229 bool isgn; 230 231 pm_runtime_get_sync(tgpio->dev->parent); 232 233 spin_lock_irqsave(&tgpio->lock, flags); 235 isgn = true; 236 scaled_ppm = -scaled_ppm; 237 } 238 239 /* 240 * HW uses a 200MHz clock, meaning it has a 5ns period. Just 241 * multiply scaled_ppm by 5 to get our increment. 242 */ 243 reg = 5 * scaled_ppm; 244 245 /* bit 31 is sign bit */ 246 reg &= ~BIT(31); 247 reg |= isgn << 31; 248 249 intel_tgpio_writel(tgpio->base, TIMINCA_GLOBAL, reg); 250 spin_unlock_irqrestore(&tgpio->lock, flags); 251 252 pm_runtime_put(tgpio->dev->parent); 253 254 return 0; 255 } 256 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org