tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 50be9417e23af5a8ac860d998e1e3f06b8fd79d7 commit: 80c4574417ae42fe2ba6978772854dc67cfc5331 h8300, nds32, openrisc: simplify detection of memory extents date: 9 months ago compiler: nds32le-linux-gcc (GCC) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> cppcheck possible warnings: (new ones prefixed by >>, may not real problems) >> arch/nds32/kernel/setup.c:247:26: warning: Unused variable: region [unusedVariable] struct memblock_region *region; ^ vim +247 arch/nds32/kernel/setup.c 001d953ede35df Greentime Hu 2017-10-24 241 001d953ede35df Greentime Hu 2017-10-24 242 static void __init setup_memory(void) 001d953ede35df Greentime Hu 2017-10-24 243 { 001d953ede35df Greentime Hu 2017-10-24 244 unsigned long ram_start_pfn; 001d953ede35df Greentime Hu 2017-10-24 245 unsigned long free_ram_start_pfn; 001d953ede35df Greentime Hu 2017-10-24 246 phys_addr_t memory_start, memory_end; 001d953ede35df Greentime Hu 2017-10-24 @247 struct memblock_region *region; 001d953ede35df Greentime Hu 2017-10-24 248 001d953ede35df Greentime Hu 2017-10-24 249 memory_end = memory_start = 0; 001d953ede35df Greentime Hu 2017-10-24 250 001d953ede35df Greentime Hu 2017-10-24 251 /* Find main memory where is the kernel */ 80c4574417ae42 Mike Rapoport 2020-10-13 252 memory_start = memblock_start_of_DRAM(); 80c4574417ae42 Mike Rapoport 2020-10-13 253 memory_end = memblock_end_of_DRAM(); 001d953ede35df Greentime Hu 2017-10-24 254 001d953ede35df Greentime Hu 2017-10-24 255 if (!memory_end) { 001d953ede35df Greentime Hu 2017-10-24 256 panic("No memory!"); 001d953ede35df Greentime Hu 2017-10-24 257 } 001d953ede35df Greentime Hu 2017-10-24 258 001d953ede35df Greentime Hu 2017-10-24 259 ram_start_pfn = PFN_UP(memblock_start_of_DRAM()); 001d953ede35df Greentime Hu 2017-10-24 260 /* free_ram_start_pfn is first page after kernel */ 001d953ede35df Greentime Hu 2017-10-24 261 free_ram_start_pfn = PFN_UP(__pa(&_end)); 001d953ede35df Greentime Hu 2017-10-24 262 max_pfn = PFN_DOWN(memblock_end_of_DRAM()); 001d953ede35df Greentime Hu 2017-10-24 263 /* it could update max_pfn */ 001d953ede35df Greentime Hu 2017-10-24 264 if (max_pfn - ram_start_pfn <= MAXMEM_PFN) 001d953ede35df Greentime Hu 2017-10-24 265 max_low_pfn = max_pfn; 001d953ede35df Greentime Hu 2017-10-24 266 else { 001d953ede35df Greentime Hu 2017-10-24 267 max_low_pfn = MAXMEM_PFN + ram_start_pfn; 001d953ede35df Greentime Hu 2017-10-24 268 if (!IS_ENABLED(CONFIG_HIGHMEM)) 001d953ede35df Greentime Hu 2017-10-24 269 max_pfn = MAXMEM_PFN + ram_start_pfn; 001d953ede35df Greentime Hu 2017-10-24 270 } 001d953ede35df Greentime Hu 2017-10-24 271 /* high_memory is related with VMALLOC */ 001d953ede35df Greentime Hu 2017-10-24 272 high_memory = (void *)__va(max_low_pfn * PAGE_SIZE); 001d953ede35df Greentime Hu 2017-10-24 273 min_low_pfn = free_ram_start_pfn; 001d953ede35df Greentime Hu 2017-10-24 274 001d953ede35df Greentime Hu 2017-10-24 275 /* 001d953ede35df Greentime Hu 2017-10-24 276 * initialize the boot-time allocator (with low memory only). 001d953ede35df Greentime Hu 2017-10-24 277 * 001d953ede35df Greentime Hu 2017-10-24 278 * This makes the memory from the end of the kernel to the end of 001d953ede35df Greentime Hu 2017-10-24 279 * RAM usable. 001d953ede35df Greentime Hu 2017-10-24 280 */ 001d953ede35df Greentime Hu 2017-10-24 281 memblock_set_bottom_up(true); 001d953ede35df Greentime Hu 2017-10-24 282 memblock_reserve(PFN_PHYS(ram_start_pfn), PFN_PHYS(free_ram_start_pfn - ram_start_pfn)); 001d953ede35df Greentime Hu 2017-10-24 283 001d953ede35df Greentime Hu 2017-10-24 284 early_init_fdt_reserve_self(); 001d953ede35df Greentime Hu 2017-10-24 285 early_init_fdt_scan_reserved_mem(); 001d953ede35df Greentime Hu 2017-10-24 286 001d953ede35df Greentime Hu 2017-10-24 287 memblock_dump_all(); 001d953ede35df Greentime Hu 2017-10-24 288 } 001d953ede35df Greentime Hu 2017-10-24 289 :::::: The code at line 247 was first introduced by commit :::::: 001d953ede35dfb135e636af4b41d5dd20a09471 nds32: Kernel booting and initialization :::::: TO: Greentime Hu <greentime@xxxxxxxxxxxxx> :::::: CC: Greentime Hu <greentime@xxxxxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
