tree: https://github.com/intel/linux-intel-lts.git 4.19/android_r head: 072f407465e8e25a3c2c22590e1ab72ccf335151 commit: 36960edcc32ce26bcf470e6129c4dc26a44e97ca [20730/22631] UPSTREAM: parisc: Switch from DISCONTIGMEM to SPARSEMEM config: parisc-randconfig-r013-20210409 (attached as .config) compiler: hppa-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/intel/linux-intel-lts/commit/36960edcc32ce26bcf470e612... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 4.19/android_r git checkout 36960edcc32ce26bcf470e6129c4dc26a44e97ca # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 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/parisc/mm/init.c: In function 'pagetable_init': arch/parisc/mm/init.c:655:17: warning: variable 'end_paddr' set but not used [-Wunused-but-set-variable] 655 | unsigned long end_paddr; | ^~~~~~~~~ arch/parisc/mm/init.c: In function 'paging_init': 734 | memblocks_present(); | ^~~~~~~~~~~~~~~~~ | memblock_reserve cc1: some warnings being treated as errors vim +734 arch/parisc/mm/init.c 638 639 /* 640 * pagetable_init() sets up the page tables 641 * 642 * Note that gateway_init() places the Linux gateway page at page 0. 643 * Since gateway pages cannot be dereferenced this has the desirable 644 * side effect of trapping those pesky NULL-reference errors in the 645 * kernel. 646 */ 647 static void __init pagetable_init(void) 648 { 649 int range; 650 651 /* Map each physical memory range to its kernel vaddr */ 652 653 for (range = 0; range < npmem_ranges; range++) { 654 unsigned long start_paddr; 656 unsigned long size; 657 658 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; 659 size = pmem_ranges[range].pages << PAGE_SHIFT; 660 end_paddr = start_paddr + size; 661 662 map_pages((unsigned long)__va(start_paddr), start_paddr, 663 size, PAGE_KERNEL, 0); 664 } 665 666 #ifdef CONFIG_BLK_DEV_INITRD 667 if (initrd_end && initrd_end > mem_limit) { 668 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); 669 map_pages(initrd_start, __pa(initrd_start), 670 initrd_end - initrd_start, PAGE_KERNEL, 0); 671 } 672 #endif 673 674 empty_zero_page = get_memblock(PAGE_SIZE); 675 } 676 677 static void __init gateway_init(void) 678 { 679 unsigned long linux_gateway_page_addr; 680 /* FIXME: This is 'const' in order to trick the compiler 681 into not treating it as DP-relative data. */ 682 extern void * const linux_gateway_page; 683 684 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; 685 686 /* 687 * Setup Linux Gateway page. 688 * 689 * The Linux gateway page will reside in kernel space (on virtual 690 * page 0), so it doesn't need to be aliased into user space. 691 */ 692 693 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), 694 PAGE_SIZE, PAGE_GATEWAY, 1); 695 } 696 697 static void __init parisc_bootmem_free(void) 698 { 699 unsigned long zones_size[MAX_NR_ZONES] = { 0, }; 700 unsigned long holes_size[MAX_NR_ZONES] = { 0, }; 701 unsigned long mem_start_pfn = ~0UL, mem_end_pfn = 0, mem_size_pfn = 0; 702 int i; 703 704 for (i = 0; i < npmem_ranges; i++) { 705 unsigned long start = pmem_ranges[i].start_pfn; 706 unsigned long size = pmem_ranges[i].pages; 707 unsigned long end = start + size; 708 709 if (mem_start_pfn > start) 710 mem_start_pfn = start; 711 if (mem_end_pfn < end) 712 mem_end_pfn = end; 713 mem_size_pfn += size; 714 } 715 716 zones_size[0] = mem_end_pfn - mem_start_pfn; 717 holes_size[0] = zones_size[0] - mem_size_pfn; 718 719 free_area_init_node(0, zones_size, mem_start_pfn, holes_size); 720 } 721 722 void __init paging_init(void) 723 { 724 setup_bootmem(); 725 pagetable_init(); 726 gateway_init(); 727 flush_cache_all_local(); /* start with known state */ 728 flush_tlb_all_local(NULL); 729 730 /* 731 * Mark all memblocks as present for sparsemem using 732 * memory_present() and then initialize sparsemem. 733 */ 735 sparse_init(); 736 parisc_bootmem_free(); 737 } 738 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org