tree: https://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git mm-bulk-rebase-v5r7 head: 4421e102e22b8958c4a06e33d5a628f1d0b6110e commit: e0184c95d87dcd562f509145ada6da38e5b5f252 [13/15] SUNRPC: Refresh rq_pages using a bulk page allocator config: m68k-allmodconfig (attached as .config) compiler: m68k-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://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git/commit/?id=... git remote add mel https://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git git fetch --no-tags mel mm-bulk-rebase-v5r7 git checkout e0184c95d87dcd562f509145ada6da38e5b5f252 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 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 >>): In file included from include/linux/kernel.h:10, from include/linux/list.h:9, from include/linux/rculist.h:10, from include/linux/pid.h:5, from include/linux/sched.h:14, from net/sunrpc/svc_xprt.c:8: include/linux/scatterlist.h: In function 'sg_set_buf': arch/m68k/include/asm/page_mm.h:174:49: warning: ordered comparison of pointer with null pointer [-Wextra] 174 | #define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory) | ^~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ include/linux/scatterlist.h:137:2: note: in expansion of macro 'BUG_ON' 137 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~ include/linux/scatterlist.h:137:10: note: in expansion of macro 'virt_addr_valid' 137 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~~~~~~~~~~ net/sunrpc/svc_xprt.c: In function 'svc_alloc_arg': 666 | needed -= alloc_pages_bulk(GFP_KERNEL, needed, &list); | ^~~~~~~~~~~~~~~~ | alloc_pages_node cc1: some warnings being treated as errors vim +666 net/sunrpc/svc_xprt.c 641 642 static int svc_alloc_arg(struct svc_rqst *rqstp) 643 { 644 struct svc_serv *serv = rqstp->rq_server; 645 unsigned long needed; 646 struct xdr_buf *arg; 647 struct page *page; 648 LIST_HEAD(list); 649 int pages; 650 int i; 651 652 pages = (serv->sv_max_mesg + 2 * PAGE_SIZE) >> PAGE_SHIFT; 653 if (pages > RPCSVC_MAXPAGES) { 654 pr_warn_once("svc: warning: pages=%u > RPCSVC_MAXPAGES=%lu\n", 655 pages, RPCSVC_MAXPAGES); 656 /* use as many pages as possible */ 657 pages = RPCSVC_MAXPAGES; 658 } 659 660 for (needed = 0, i = 0; i < pages ; i++) { 661 if (!rqstp->rq_pages[i]) 662 needed++; 663 } 664 i = 0; 665 while (needed) { 667 for (; i < pages; i++) { 668 if (rqstp->rq_pages[i]) 669 continue; 670 page = list_first_entry_or_null(&list, struct page, lru); 671 if (likely(page)) { 672 list_del(&page->lru); 673 rqstp->rq_pages[i] = page; 674 continue; 675 } 676 set_current_state(TASK_INTERRUPTIBLE); 677 if (signalled() || kthread_should_stop()) { 678 set_current_state(TASK_RUNNING); 679 return -EINTR; 680 } 681 schedule_timeout(msecs_to_jiffies(500)); 682 break; 683 } 684 } 685 rqstp->rq_page_end = &rqstp->rq_pages[pages]; 686 rqstp->rq_pages[pages] = NULL; /* this might be seen in nfsd_splice_actor() */ 687 688 /* Make arg->head point to first page and arg->pages point to rest */ 689 arg = &rqstp->rq_arg; 690 arg->head[0].iov_base = page_address(rqstp->rq_pages[0]); 691 arg->head[0].iov_len = PAGE_SIZE; 692 arg->pages = rqstp->rq_pages + 1; 693 arg->page_base = 0; 694 /* save at least one page for response */ 695 arg->page_len = (pages-2)*PAGE_SIZE; 696 arg->len = (pages-1)*PAGE_SIZE; 697 arg->tail[0].iov_len = 0; 698 return 0; 699 } 700 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org