Hi Niklas, I love your patch! Yet something to improve: [auto build test ERROR on soc/for-next] [also build test ERROR on asm-generic/master v5.12-rc8 next-20210421] [cannot apply to arc/for-next] [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/Niklas-Schnelle/asm-generic-io-h-Silence-Wnull-pointer-arithmetic-warning-on-PCI_IOBASE/20210421-192025 base: https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next config: h8300-randconfig-r025-20210421 (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 # https://github.com/0day-ci/linux/commit/05bc9b9b640336015712d139ebc42830d12a82da git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Niklas-Schnelle/asm-generic-io-h-Silence-Wnull-pointer-arithmetic-warning-on-PCI_IOBASE/20210421-192025 git checkout 05bc9b9b640336015712d139ebc42830d12a82da # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=h8300 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): In file included from arch/h8300/include/asm/io.h:63, from drivers/input/gameport/lightning.c:13: include/asm-generic/io.h: In function '_inb': >> include/asm-generic/io.h:465:2: error: implicit declaration of function 'WARN_ONCE' [-Werror=implicit-function-declaration] 465 | WARN_ONCE(1, "No I/O port support\n"); | ^~~~~~~~~ cc1: some warnings being treated as errors vim +/WARN_ONCE +465 include/asm-generic/io.h 446 447 /* 448 * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be 449 * implemented on hardware that needs an additional delay for I/O accesses to 450 * take effect. 451 */ 452 453 #if !defined(inb) && !defined(_inb) 454 #define _inb _inb 455 static inline u8 _inb(unsigned long addr) 456 { 457 #ifdef PCI_IOBASE 458 u8 val; 459 460 __io_pbr(); 461 val = __raw_readb(PCI_IOBASE + addr); 462 __io_par(val); 463 return val; 464 #else > 465 WARN_ONCE(1, "No I/O port support\n"); 466 return ~0; 467 #endif 468 } 469 #endif 470 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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