tree: git://git.infradead.org/users/hch/misc.git dma-header-cleanups head: 5093be553444b2cc6c459d6e9f5a4692ac0b4125 commit: 66216ba208594466fc57ef598198a7821a995ea0 [23/31] dma-mapping: split <linux/dma-mapping.h> config: x86_64-randconfig-a016-20200911 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git checkout 66216ba208594466fc57ef598198a7821a995ea0 # 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/pci/xen-pcifront.c: In function 'pcifront_connect_and_init_dma': 695 | if (!err && !swiotlb_nr_tbl()) { | ^~~~~~~~~~~~~~ cc1: some warnings being treated as errors git remote add hch-misc git://git.infradead.org/users/hch/misc.git git fetch --no-tags hch-misc dma-header-cleanups git checkout 66216ba208594466fc57ef598198a7821a995ea0 vim +/swiotlb_nr_tbl +695 drivers/pci/xen-pcifront.c 956a9202cd1220 Ryan Wilson 2010-08-02 674 956a9202cd1220 Ryan Wilson 2010-08-02 675 static irqreturn_t pcifront_handler_aer(int irq, void *dev) 956a9202cd1220 Ryan Wilson 2010-08-02 676 { 956a9202cd1220 Ryan Wilson 2010-08-02 677 struct pcifront_device *pdev = dev; 956a9202cd1220 Ryan Wilson 2010-08-02 678 schedule_pcifront_aer_op(pdev); 956a9202cd1220 Ryan Wilson 2010-08-02 679 return IRQ_HANDLED; 956a9202cd1220 Ryan Wilson 2010-08-02 680 } 3d925320e9e2de Konrad Rzeszutek Wilk 2012-07-31 681 static int pcifront_connect_and_init_dma(struct pcifront_device *pdev) 956a9202cd1220 Ryan Wilson 2010-08-02 682 { 956a9202cd1220 Ryan Wilson 2010-08-02 683 int err = 0; 956a9202cd1220 Ryan Wilson 2010-08-02 684 956a9202cd1220 Ryan Wilson 2010-08-02 685 spin_lock(&pcifront_dev_lock); 956a9202cd1220 Ryan Wilson 2010-08-02 686 956a9202cd1220 Ryan Wilson 2010-08-02 687 if (!pcifront_dev) { 956a9202cd1220 Ryan Wilson 2010-08-02 688 dev_info(&pdev->xdev->dev, "Installing PCI frontend\n"); 956a9202cd1220 Ryan Wilson 2010-08-02 689 pcifront_dev = pdev; 098b1aeaf4d614 Konrad Rzeszutek Wilk 2013-06-10 690 } else 956a9202cd1220 Ryan Wilson 2010-08-02 691 err = -EEXIST; 098b1aeaf4d614 Konrad Rzeszutek Wilk 2013-06-10 692 956a9202cd1220 Ryan Wilson 2010-08-02 693 spin_unlock(&pcifront_dev_lock); 956a9202cd1220 Ryan Wilson 2010-08-02 694 3d925320e9e2de Konrad Rzeszutek Wilk 2012-07-31 @695 if (!err && !swiotlb_nr_tbl()) { 3d925320e9e2de Konrad Rzeszutek Wilk 2012-07-31 696 err = pci_xen_swiotlb_init_late(); 3d925320e9e2de Konrad Rzeszutek Wilk 2012-07-31 697 if (err) 3d925320e9e2de Konrad Rzeszutek Wilk 2012-07-31 698 dev_err(&pdev->xdev->dev, "Could not setup SWIOTLB!\n"); 3d925320e9e2de Konrad Rzeszutek Wilk 2012-07-31 699 } 956a9202cd1220 Ryan Wilson 2010-08-02 700 return err; 956a9202cd1220 Ryan Wilson 2010-08-02 701 } 956a9202cd1220 Ryan Wilson 2010-08-02 702 :::::: The code at line 695 was first introduced by commit :::::: 3d925320e9e2de162bd138bf97816bda8c3f71be xen/pcifront: Use Xen-SWIOTLB when initting if required. :::::: TO: Konrad Rzeszutek Wilk <konrad.wilk(a)oracle.com&gt; :::::: CC: Konrad Rzeszutek Wilk <konrad.wilk(a)oracle.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org