tree: git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock.git for-kernelci head: a67db182d2b2007db563e1c95519fabd15d52095 commit: a67db182d2b2007db563e1c95519fabd15d52095 [3/3] arm: extend pfn_valid to take into accound freed memory map alignment config: arm-defconfig (attached as .config) compiler: arm-linux-gnueabi-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://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock.git/commit/... git remote add rppt-memblock git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock.git git fetch --no-tags rppt-memblock for-kernelci git checkout a67db182d2b2007db563e1c95519fabd15d52095 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/arm/mm/init.c:97:13: warning: no previous prototype for 'setup_dma_zone' [-Wmissing-prototypes] 97 | void __init setup_dma_zone(const struct machine_desc *mdesc) | ^~~~~~~~~~~~~~ arch/arm/mm/init.c: In function 'pfn_valid': 143 | pageblock_size); | ^ | ) arch/arm/mm/init.c:141:5: note: to match this '(' 141 | if (memblock_overlaps_region(&memblock.memory, | ^ 147 | } | ^ arch/arm/mm/init.c:147:1: error: control reaches end of non-void function [-Werror=return-type] 147 | } | ^ cc1: some warnings being treated as errors vim +143 arch/arm/mm/init.c 123 124 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 125 int pfn_valid(unsigned long pfn) 126 { 127 phys_addr_t addr = __pfn_to_phys(pfn); 128 unsigned long pageblock_size = PAGE_SIZE * pageblock_nr_pages; 129 130 if (__phys_to_pfn(addr) != pfn) 131 return 0; 132 133 if (memblock_is_map_memory(addr)) 134 return 1; 135 136 /* 137 * If address less than pageblock_size bytes away from a present 138 * memory chunk there still will be a memory map entry for it 139 * because we round freed memory map to the pageblock boundaries 140 */ 141 if (memblock_overlaps_region(&memblock.memory, 142 ALIGN_DOWN(addr, pageblock_size), 144 return 1; 145 146 return 0; 148 EXPORT_SYMBOL(pfn_valid); 149 #endif 150 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org