tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: 5e9e6d86fe729cf81e8a0df5c53d326b9f2ec791 [415/1142] xlink-usb: XLink USB Remote and Local Host driver config: x86_64-randconfig-r026-20210514 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 425781bce01f2f1d5f553d3b2bf9ebbd6e15068c) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/intel/linux-intel-lts/commit/5e9e6d86fe729cf81e8a0df5c... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 5.4/yocto git checkout 5e9e6d86fe729cf81e8a0df5c53d326b9f2ec791 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 warnings (new ones prefixed by >>): return vpu_close1(data); ^~~~ drivers/misc/xlink-usb/local_host/u_xlink.h:75:20: note: passing argument to parameter 'size' here int vpu_close1(int size); ^ 1 warning generated. -- unsigned long flags; ^ bcopy = min(remaining, req->length); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/kernel.h:875:19: note: expanded from macro 'min' #define min(x, y) __careful_cmp(x, y, <) ^~~~~~~~~~~~~~~~~~~~~~ include/linux/kernel.h:866:24: note: expanded from macro '__careful_cmp' __builtin_choose_expr(__safe_cmp(x, y), \ ^~~~~~~~~~~~~~~~ include/linux/kernel.h:856:4: note: expanded from macro '__safe_cmp' (__typecheck(x, y) && __no_side_effects(x, y)) ^~~~~~~~~~~~~~~~~ include/linux/kernel.h:842:29: note: expanded from macro '__typecheck' (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1))) ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~ drivers/misc/xlink-usb/local_host/u_xlink.c:976:10: warning: ISO C90 forbids mixing declarations and code [-Wdeclaration-after-statement] size_t bcopy; ^ drivers/misc/xlink-usb/local_host/u_xlink.c:970:20: warning: ISO C90 forbids mixing declarations and code [-Wdeclaration-after-statement] struct list_head *pool = &port->read_pool; ^ drivers/misc/xlink-usb/local_host/u_xlink.c:992:20: warning: ISO C90 forbids mixing declarations and code [-Wdeclaration-after-statement] struct list_head *pool = &port->read_pool; ^ while (!list_empty(pool)) { ^~~~~~~~~~~~~~~~~ drivers/misc/xlink-usb/local_host/u_xlink.c:1002:9: note: uninitialized use occurs here return BUF4; ^~~~ drivers/misc/xlink-usb/local_host/u_xlink.c:996:9: note: remove the condition if it is always true while (!list_empty(pool)) { ^~~~~~~~~~~~~~~~~ 1 drivers/misc/xlink-usb/local_host/u_xlink.c:993:11: note: initialize the variable 'BUF4' to silence this warning int *BUF4; ^ = NULL 6 warnings generated. -- int mxlk_trigger_reset(void *arg) ^ drivers/misc/xlink-usb/local_host/f_vpuusb.c:349:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int mxlk_trigger_reset(void *arg) ^ static int *data = vpu_read_swid(data); ~~~~ ^~~~ int vpu_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) ^ drivers/misc/xlink-usb/local_host/f_vpuusb.c:377:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int vpu_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) ^ static int vpu_cdc_notify(struct f_acm *acm, u8 type, u16 value, ^ drivers/misc/xlink-usb/local_host/f_vpuusb.c:525:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int vpu_cdc_notify(struct f_acm *acm, u8 type, u16 value, ^ static int vpu_notify_serial_state(struct f_acm *acm) ^ drivers/misc/xlink-usb/local_host/f_vpuusb.c:562:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int vpu_notify_serial_state(struct f_acm *acm) ^ static 5 warnings generated. vim +110 drivers/misc/xlink-usb/local_host/mxlk_interface.c 97 98 int xlink_usb_write(uint32_t sw_device_id, void *data, size_t *const size, 99 uint32_t timeout) 100 { 101 int mxlk; 102 int rc; 103 104 mxlk = usb_get_by_id(sw_device_id); 105 if (!mxlk) 106 return -ENODEV; 107 rc = vpu_write1(data, size, timeout); 108 if (rc < 0) 109 return rc; 111 } 112 EXPORT_SYMBOL(xlink_usb_write); 113 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org