Hi Mike, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git memblock/iterators-cleanup/v1 head: ed81b9564b7ba7e732e412530a4c330e281bb3a5 commit: 846f1f1ba3c1483bc769b583f708fbfca8aa50d2 [14/16] arch, drivers: replace for_each_membock() with for_each_mem_range() config: riscv-randconfig-r022-20200730 (attached as .config) compiler: riscv32-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 git checkout 846f1f1ba3c1483bc769b583f708fbfca8aa50d2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 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/riscv/mm/init.c: In function 'setup_bootmem': 151 | phys_addr_t mem_start, end = 0; | ^~~ arch/riscv/mm/init.c:148:21: note: previous declaration of 'end' was here 148 | phys_addr_t start, end; | ^~~ vim +/end +151 arch/riscv/mm/init.c 922b0375fc93fb Albert Ou 2019-09-27 145 0651c263c8e39f Anup Patel 2019-02-21 146 void __init setup_bootmem(void) 0651c263c8e39f Anup Patel 2019-02-21 147 { 846f1f1ba3c148 Mike Rapoport 2020-07-26 148 phys_addr_t start, end; 0651c263c8e39f Anup Patel 2019-02-21 149 phys_addr_t mem_size = 0; fa5a198359053c Atish Patra 2020-07-15 150 phys_addr_t total_mem = 0; fa5a198359053c Atish Patra 2020-07-15 @151 phys_addr_t mem_start, end = 0; ac51e005fe1456 Zong Li 2020-01-02 152 phys_addr_t vmlinux_end = __pa_symbol(&_end); ac51e005fe1456 Zong Li 2020-01-02 153 phys_addr_t vmlinux_start = __pa_symbol(&_start); 846f1f1ba3c148 Mike Rapoport 2020-07-26 154 u64 i; 0651c263c8e39f Anup Patel 2019-02-21 155 0651c263c8e39f Anup Patel 2019-02-21 156 /* Find the memory region containing the kernel */ 846f1f1ba3c148 Mike Rapoport 2020-07-26 157 for_each_mem_range(i, &start, &end) { 846f1f1ba3c148 Mike Rapoport 2020-07-26 158 phys_addr_t size = end - start; fa5a198359053c Atish Patra 2020-07-15 159 if (!total_mem) 846f1f1ba3c148 Mike Rapoport 2020-07-26 160 mem_start = start; 846f1f1ba3c148 Mike Rapoport 2020-07-26 161 if (start <= vmlinux_start && vmlinux_end <= end) 846f1f1ba3c148 Mike Rapoport 2020-07-26 162 BUG_ON(size == 0); 846f1f1ba3c148 Mike Rapoport 2020-07-26 163 total_mem = total_mem + size; fa5a198359053c Atish Patra 2020-07-15 164 } f05badde4e20d2 Anup Patel 2019-04-05 165 f05badde4e20d2 Anup Patel 2019-04-05 166 /* f05badde4e20d2 Anup Patel 2019-04-05 167 * Remove memblock from the end of usable area to the f05badde4e20d2 Anup Patel 2019-04-05 168 * end of region f05badde4e20d2 Anup Patel 2019-04-05 169 */ fa5a198359053c Atish Patra 2020-07-15 170 mem_size = min(total_mem, (phys_addr_t)-PAGE_OFFSET); fa5a198359053c Atish Patra 2020-07-15 171 if (mem_start + mem_size < end) fa5a198359053c Atish Patra 2020-07-15 172 memblock_remove(mem_start + mem_size, fa5a198359053c Atish Patra 2020-07-15 173 end - mem_start - mem_size); 0651c263c8e39f Anup Patel 2019-02-21 174 d90d45d7dcb732 Anup Patel 2019-06-07 175 /* Reserve from the start of the kernel to the end of the kernel */ d90d45d7dcb732 Anup Patel 2019-06-07 176 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); d90d45d7dcb732 Anup Patel 2019-06-07 177 c749bb2d554825 Vincent Chen 2020-04-27 178 max_pfn = PFN_DOWN(memblock_end_of_DRAM()); c749bb2d554825 Vincent Chen 2020-04-27 179 max_low_pfn = max_pfn; d0d8aae64566b7 Atish Patra 2020-07-15 180 set_max_mapnr(max_low_pfn); 0651c263c8e39f Anup Patel 2019-02-21 181 :::::: The code at line 151 was first introduced by commit :::::: fa5a198359053c8e21dcc2b39c0e13871059bc9f riscv: Parse all memory blocks to remove unusable memory :::::: TO: Atish Patra <atish.patra(a)wdc.com&gt; :::::: CC: Palmer Dabbelt <palmerdabbelt(a)google.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org