On Wed, 2021-04-21 at 23:19 +0800, kernel test robot wrote: > 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 sparc-next/master] > [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: riscv-nommu_k210_defconfig (attached as .config) > compiler: riscv64-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=riscv > > 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/riscv/include/asm/clint.h:10, > from arch/riscv/include/asm/timex.h:15, > from include/linux/timex.h:65, > from include/linux/time32.h:13, > from include/linux/time.h:60, > from include/linux/stat.h:19, > from include/linux/module.h:13, > from init/main.c:17: > include/asm-generic/io.h: In function 'inb_p': > > > arch/riscv/include/asm/io.h:55:65: error: 'PCI_IOBASE' undeclared (first use in this function) > 55 | #define inb(c) ({ u8 __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; }) Interesting, it looks to me like RISC-V sets PCI_IOBASE to ((void __iomem *)PCI_IO_START) if running with an MMU but leaves it undefined without an MMU. It does then use its own (broken?) inb/w/l() macros with PCI_IOBASE 0 from asm-generic/io.h. What a mess ;-(
