On Thu, Aug 11, 2022 at 03:16:08PM +0800, kernel test robot wrote: > Thank you for the patch! Perhaps something to improve: > > [auto build test WARNING on arm64/for-next/core] > [also build test WARNING on linus/master next-20220811] > [cannot apply to kvmarm/next arm/for-next soc/for-next xilinx-xlnx/master v5.19] > [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#_base_tree_information] > > url: https://github.com/intel-lab-lkp/linux/commits/Peter-Collingbourne/KVM-arm64-permit-MAP_SHARED-mappings-with-MTE-enabled/20220811-033310 > base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core > config: loongarch-defconfig (https://download.01.org/0day-ci/archive/20220811/202208111500.62e0Bl2l-lkp@xxxxxxxxx/config) > compiler: loongarch64-linux-gcc (GCC) 12.1.0 > 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/intel-lab-lkp/linux/commit/1a400517d8428df0ec9f86f8d303b2227ee9702f > git remote add linux-review https://github.com/intel-lab-lkp/linux > git fetch --no-tags linux-review Peter-Collingbourne/KVM-arm64-permit-MAP_SHARED-mappings-with-MTE-enabled/20220811-033310 > git checkout 1a400517d8428df0ec9f86f8d303b2227ee9702f > # save the config file > mkdir build_dir && cp config build_dir/.config > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash > > If you fix the issue, kindly add following tag where applicable > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > All warnings (new ones prefixed by >>): > > >> mm/memory.c:92:2: warning: #warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid. [-Wcpp] > 92 | #warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid. > | ^~~~~~~ > > > vim +92 mm/memory.c > > 42b7772812d15b Jan Beulich 2008-07-23 90 > af27d9403f5b80 Arnd Bergmann 2018-02-16 91 #if defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS) && !defined(CONFIG_COMPILE_TEST) > 90572890d20252 Peter Zijlstra 2013-10-07 @92 #warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid. > 75980e97daccfc Peter Zijlstra 2013-02-22 93 #endif > 75980e97daccfc Peter Zijlstra 2013-02-22 94 It looks like ith CONFIG_NUMA_BALANCING=y on loongarch we run out of spare bits in page->flags to fit last_cpupid. The reason we don't see it on arm64 is that we select SPARSEMEM_VMEMMAP and SECTIONS_WIDTH becomes 0. On loongarch SECTIONS_WIDTH takes 19 bits (48 - 29) in page->flags. I think instead of always defining PG_arch_{2,3} if CONFIG_64BIT, we could add a CONFIG_ARCH_WANTS_PG_ARCH_23 option and only select it on arm64 for the time being. -- Catalin _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
