tree: https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git fuzzing_cleanup head: c4ec33c20414ce14307795bfab4eb3b83de76746 commit: d413e9c4421cbbb071f66ab089bd457ffcbfd330 [5/8] xhci: add xhci_get_virt_ep() helper config: alpha-randconfig-r021-20201217 (attached as .config) compiler: alpha-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/mnyman/xhci.git/commit/?i... git remote add xhci https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git git fetch --no-tags xhci fuzzing_cleanup git checkout d413e9c4421cbbb071f66ab089bd457ffcbfd330 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha 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 >>): 449 | struct xhci_virt_ep *xhci_get_virt_ep(struct xhci_hcd *xhci, unsigned int slot_id, | ^~~~~~~~~~~~~~~~ vim +/xhci_get_virt_ep +449 drivers/usb/host/xhci-ring.c 448 450 unsigned int ep_index) 451 { 452 if (slot_id == 0 || slot_id >= MAX_HC_SLOTS) { 453 xhci_warn(xhci, "Invalid slot_id %u\n", slot_id); 454 return NULL; 455 } 456 if (ep_index >= EP_CTX_PER_DEV) { 457 xhci_warn(xhci, "Invalid endpoint index %u\n", ep_index); 458 return NULL; 459 } 460 if (!xhci->devs[slot_id]) { 461 xhci_warn(xhci, "No xhci virt device for slot_id %u\n", slot_id); 462 return NULL; 463 } 464 465 return &xhci->devs[slot_id]->eps[ep_index]; 466 } 467 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org