tree: https://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap.git serdev-ngsm-pending-v5.7 head: 4eda51fea6be98ca5a4023a988b102bf3629b295 commit: ae348e86a0abccb615c8875a95d63f10268f1c4f [20/29] gnss: motmdm: Add support for Motorola Mapphone MDM6600 modem config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b) 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 git checkout ae348e86a0abccb615c8875a95d63f10268f1c4f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): int motmdm_gnss_send_command(struct motmdm_gnss_data *ddata, ^ drivers/gnss/motmdm.c:71:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int motmdm_gnss_send_command(struct motmdm_gnss_data *ddata, ^ static 1 warning generated. vim +/motmdm_gnss_send_command +71 drivers/gnss/motmdm.c 62 63 /* 64 * Note that multiple commands can be sent in series with responses coming 65 * out-of-order. For GNSS, we don't need to care about the out-of-order 66 * responses, and can assume we have at most one command active at a time. 67 * For the commands, can use just a jiffies base packet ID and let the modem 68 * sort out the ID conflicts with the modem's unsolicited message ID 69 * numbering. 70 */ 72 const u8 *buf, int len) 73 { 74 struct gnss_device *gdev = ddata->gdev; 75 const int timeout_ms = 1000; 76 unsigned char cmd[128]; 77 int ret, cmdlen; 78 79 cmdlen = len + 5 + 1; 80 if (cmdlen > 128) 81 return -EINVAL; 82 83 mutex_lock(&ddata->mutex); 84 memset(ddata->buf, 0, ddata->len); 85 ddata->parsed = false; 86 snprintf(cmd, cmdlen, "U%04li%s", jiffies % 10000, buf); 87 ret = serdev_ngsm_write(ddata->modem, &ddata->dlci, cmd, cmdlen); 88 if (ret < 0) 89 goto out_unlock; 90 91 ret = wait_event_timeout(ddata->read_queue, ddata->parsed, 92 msecs_to_jiffies(timeout_ms)); 93 if (ret == 0) { 94 ret = -ETIMEDOUT; 95 goto out_unlock; 96 } else if (ret < 0) { 97 goto out_unlock; 98 } 99 100 if (!strstr(ddata->buf, ":OK")) { 101 dev_err(&gdev->dev, "command %s error %s\n", 102 cmd, ddata->buf); 103 ret = -EPIPE; 104 } 105 106 ret = len; 107 108 out_unlock: 109 mutex_unlock(&ddata->mutex); 110 111 return ret; 112 } 113 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org