tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 06a4ec1d9dc652e17ee3ac2ceb6c7cf6c2b75cdd commit: b020aa9d1e875c1c91b1390acdf42320e7060d84 powerpc: cleanup hw_irq.h date: 9 months ago config: powerpc64-randconfig-s031-20200818 (attached as .config) compiler: powerpc-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-180-g49f7e13a-dirty git checkout b020aa9d1e875c1c91b1390acdf42320e7060d84 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=powerpc64 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/tty/serial/8250/8250_port.c: note: in included file (through include/linux/io.h, include/linux/irq.h, arch/powerpc/include/asm/hardirq.h, ...): arch/powerpc/include/asm/io.h:149:1: sparse: sparse: dereference of noderef expression arch/powerpc/include/asm/io.h:144:1: sparse: sparse: dereference of noderef expression arch/powerpc/include/asm/io.h:150:1: sparse: sparse: dereference of noderef expression arch/powerpc/include/asm/io.h:145:1: sparse: sparse: dereference of noderef expression drivers/tty/serial/8250/8250_port.c: note: in included file (through arch/powerpc/include/asm/processor.h, arch/powerpc/include/asm/thread_info.h, include/linux/thread_info.h, ...): # 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 b020aa9d1e875c1c91b1390acdf42320e7060d84 vim +/serial8250_console_write +1376 arch/powerpc/include/asm/reg.h 1359 1360 #define mfspr(rn) ({unsigned long rval; \ 1361 asm volatile("mfspr %0," __stringify(rn) \ 1362 : "=r" (rval)); rval;}) 1363 #ifndef mtspr 1364 #define mtspr(rn, v) asm volatile("mtspr " __stringify(rn) ",%0" : \ 1365 : "r" ((unsigned long)(v)) \ 1366 : "memory") 1367 #endif 1368 #define wrtspr(rn) asm volatile("mtspr " __stringify(rn) ",0" : \ 1369 : : "memory") 1370 1371 static inline void wrtee(unsigned long val) 1372 { 1373 if (__builtin_constant_p(val)) 1374 asm volatile("wrteei %0" : : "i" ((val & MSR_EE) ? 1 : 0) : "memory"); 1375 else 1377 } 1378 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org