Hi Geert, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 270315b8235e3d10c2e360cff56c2f9e0915a252 commit: 077365a941166f3a7f5894017f9d26d17cdec00e pinctrl: Rename sh-pfc to renesas date: 5 weeks ago config: x86_64-randconfig-s032-20201020 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 077365a941166f3a7f5894017f9d26d17cdec00e # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/pinctrl/renesas/pinctrl-rzn1.c:189:52: sparse: sparse: dubious: x | !y vim +183 drivers/pinctrl/renesas/pinctrl-rzn1.c 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 174 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 175 static void rzn1_hw_set_lock(struct rzn1_pinctrl *ipctl, u8 lock, u8 value) 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 176 { 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 177 /* 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 178 * The pinmux configuration is locked by writing the physical address of 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 179 * the status_protect register to itself. It is unlocked by writing the 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 180 * address | 1. 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 181 */ 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 182 if (lock & LOCK_LEVEL1) { 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 @183 u32 val = ipctl->lev1_protect_phys | !(value & LOCK_LEVEL1); 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 184 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 185 writel(val, &ipctl->lev1->status_protect); 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 186 } 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 187 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 188 if (lock & LOCK_LEVEL2) { 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 189 u32 val = ipctl->lev2_protect_phys | !(value & LOCK_LEVEL2); 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 190 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 191 writel(val, &ipctl->lev2->status_protect); 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 192 } 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 193 } 4e53b5004745ef2 drivers/pinctrl/pinctrl-rzn1.c Phil Edworthy 2018-09-26 194 :::::: The code at line 183 was first introduced by commit :::::: 4e53b5004745ef26a37bca4933b2d3ea71313f2a pinctrl: renesas: Renesas RZ/N1 pinctrl driver :::::: TO: Phil Edworthy <phil.edworthy(a)renesas.com&gt; :::::: CC: Geert Uytterhoeven <geert+renesas(a)glider.be&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org