tree: https://github.com/alibaba/cloud-kernel.git linux-next head: f1885e3acf28c210490d5e53ec707beb261b1d5c commit: 733f2794cb8bd3b3b5faa81af7e240f476373e8f [277/526] virtio-mem: Paravirtualized memory hotunplug part 2 config: x86_64-randconfig-a002-20200901 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git checkout 733f2794cb8bd3b3b5faa81af7e240f476373e8f # save the attached .config to linux build tree make W=1 ARCH=x86_64 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 >>): drivers/virtio/virtio_mem.c: In function 'virtio_mem_fake_online': 721 | free_contig_range(pfn + i, 1 << order); | ^~~~~~~~~~~~~~~~~ | free_pgd_range drivers/virtio/virtio_mem.c: In function 'virtio_mem_mb_unplug_any_sb_online': 1255 | rc = alloc_contig_range(start_pfn, start_pfn + nr_pages, | ^~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors # https://github.com/alibaba/cloud-kernel/commit/733f2794cb8bd3b3b5faa81af7... git remote add alibaba-cloud https://github.com/alibaba/cloud-kernel.git git fetch --no-tags alibaba-cloud linux-next git checkout 733f2794cb8bd3b3b5faa81af7e240f476373e8f vim +721 drivers/virtio/virtio_mem.c 691 692 /* 693 * Release a range of fake-offline pages to the buddy, effectively 694 * fake-onlining them. 695 */ 696 static void virtio_mem_fake_online(unsigned long pfn, unsigned int nr_pages) 697 { 698 const int order = MAX_ORDER - 1; 699 int i; 700 701 /* 702 * We are always called with subblock granularity, which is at least 703 * aligned to MAX_ORDER - 1. 704 */ 705 for (i = 0; i < nr_pages; i += 1 << order) { 706 struct page *page = pfn_to_page(pfn + i); 707 708 /* 709 * If the page is PageDirty(), it was kept fake-offline when 710 * onlining the memory block. Otherwise, it was allocated 711 * using alloc_contig_range(). All pages in a subblock are 712 * alike. 713 */ 714 if (PageDirty(page)) { 715 virtio_mem_clear_fake_offline(pfn + i, 1 << order, 716 false); 717 generic_online_page(page, order); 718 } else { 719 virtio_mem_clear_fake_offline(pfn + i, 1 << order, 720 true); 722 adjust_managed_page_count(page, 1 << order); 723 } 724 } 725 } 726 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org