tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing head: 9a360a7cae11461ccd933a9ea366b0dcb3afadb0 commit: ac286428c69fb3dc2924ce0ad5a11b5577b2f5da [187/195] xhci: dbc: don't use generic xhci ring allocation functions for dbc. config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): git checkout ac286428c69fb3dc2924ce0ad5a11b5577b2f5da # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 410 | xhci_dbc_ring_alloc(struct device *dev, enum xhci_ring_type type, gfp_t flags) | ^~~~~~~~~~~~~~~~~~~ drivers/usb/host/xhci-dbgcap.c: In function 'xhci_dbc_mem_cleanup': drivers/usb/host/xhci-dbgcap.c:530:18: warning: unused variable 'dev' [-Wunused-variable] 530 | struct device *dev = xhci_to_hcd(xhci)->self.controller; | ^~~ vim +/xhci_dbc_ring_alloc +410 drivers/usb/host/xhci-dbgcap.c 408 409 struct xhci_ring * 411 { 412 struct xhci_ring *ring; 413 struct xhci_segment *seg; 414 dma_addr_t dma; 415 416 ring = kzalloc(sizeof(*ring), flags); 417 if (!ring) 418 return NULL; 419 420 ring->num_segs = 1; 421 ring->type = type; 422 423 seg = kzalloc(sizeof(*seg), flags); 424 if (!seg) 425 goto seg_fail; 426 427 ring->first_seg = seg; 428 ring->last_seg = seg; 429 seg->next = seg; 430 431 seg->trbs = dma_alloc_coherent(dev, TRB_SEGMENT_SIZE, &dma, flags); 432 if (!seg->trbs) 433 goto dma_fail; 434 435 seg->dma = dma; 436 437 /* Only event ring does not use link TRB */ 438 if (type != TYPE_EVENT) { 439 union xhci_trb *trb = &seg->trbs[TRBS_PER_SEGMENT - 1]; 440 441 trb->link.segment_ptr = cpu_to_le64(dma); 442 trb->link.control = cpu_to_le32(LINK_TOGGLE | TRB_TYPE(TRB_LINK)); 443 } 444 INIT_LIST_HEAD(&ring->td_list); 445 xhci_initialize_ring_info(ring, 1); 446 return ring; 447 dma_fail: 448 kfree(seg); 449 seg_fail: 450 kfree(ring); 451 return NULL; 452 } 453 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org