[kbuild-all] [omap-audio:peter/ti-linux-5.4.y/wip 6067/9999] drivers/rpmsg-kdrv/rpmsg_kdrv_demo.c:25:5: warning: no previous prototype for 'rpmsg_kdrv_demo_get_data'

tree: https://github.com/omap-audio/linux-audio peter/ti-linux-5.4.y/wip head: d4ea716deb5cae567d7ffb483c1cc6a18ca0d3ba commit: c93833f581c6f435afc85f394178caf8948b5baf [6067/9999] rpmsg-kdrv: add access APIs from virtual drivers config: nds32-randconfig-r004-20200619 (attached as .config) compiler: nds32le-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 git checkout c93833f581c6f435afc85f394178caf8948b5baf # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 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 >>, old ones prefixed by <<): 25 | int rpmsg_kdrv_demo_get_data(struct rpmsg_remotedev *rdev, void *data, ssize_t len) | ^~~~~~~~~~~~~~~~~~~~~~~~ 41 | int rpmsg_kdrv_demo_ping(struct rpmsg_remotedev *rdev, void *ping_data, ssize_t ping_len) | ^~~~~~~~~~~~~~~~~~~~ 92 | int rpmsg_kdrv_demo_c2s_message(struct rpmsg_remotedev *rdev, void *c2s_msg_data, ssize_t len) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/rpmsg_kdrv_demo_get_data +25 drivers/rpmsg-kdrv/rpmsg_kdrv_demo.c 24 26 { 27 struct rpmsg_kdrv_demo_private *priv = container_of(rdev, struct rpmsg_kdrv_demo_private, rdev); 28 29 if (!data) 30 if (!len) 31 return priv->data_len; 32 else 33 return -EINVAL; 34 else if (len < priv->data_len) 35 return -EINVAL; 36 37 memcpy(data, priv->data, priv->data_len); 38 return priv->data_len; 39 } 40 42 { 43 struct rpmsg_kdrv_demo_private *priv = container_of(rdev, struct rpmsg_kdrv_demo_private, rdev); 44 struct rpmsg_kdrv_device *kddev = priv->kddev; 45 struct rpmsg_device *rpdev = kddev->rpdev; 46 struct rpmsg_kdrv_demodev_ping_request *req; 47 struct rpmsg_kdrv_demodev_ping_response *resp; 48 int ret; 49 50 if (!ping_len) 51 return 0; 52 53 if (ping_len > RPMSG_KDRV_TP_DEMODEV_MESSAGE_DATA_LEN) 54 return -EINVAL; 55 56 req = devm_kzalloc(&kddev->dev, sizeof(*req), GFP_KERNEL); 57 if (!req) 58 return -ENOMEM; 59 60 resp = devm_kzalloc(&kddev->dev, sizeof(*resp), GFP_KERNEL); 61 if (!resp) { 62 devm_kfree(&kddev->dev, req); 63 return -ENOMEM; 64 } 65 66 req->header.message_type = RPMSG_KDRV_TP_DEMODEV_PING_REQUEST; 67 memcpy(req->data, ping_data, ping_len); 68 69 ret = rpmsg_kdrv_send_request_with_response(rpdev, kddev->device_id, req, sizeof(*req), 70 resp, sizeof(*resp)); 71 if (ret) { 72 dev_err(&kddev->dev, "%s: rpmsg_kdrv_send_request_with_response\n", __func__); 73 goto out; 74 } 75 76 77 if (resp->header.message_type != RPMSG_KDRV_TP_DEMODEV_PING_RESPONSE) { 78 dev_err(&kddev->dev, "%s: wrong response type\n", __func__); 79 ret = -EIO; 80 goto out; 81 } 82 83 84 memcpy(ping_data, resp->data, RPMSG_KDRV_TP_DEMODEV_MESSAGE_DATA_LEN); 85 86 out: 87 devm_kfree(&kddev->dev, req); 88 devm_kfree(&kddev->dev, resp); 89 return ret; 90 } 91 93 { 94 struct rpmsg_kdrv_demo_private *priv = container_of(rdev, struct rpmsg_kdrv_demo_private, rdev); 95 struct rpmsg_kdrv_device *kddev = priv->kddev; 96 struct rpmsg_device *rpdev = kddev->rpdev; 97 struct rpmsg_kdrv_demodev_c2s_message *msg; 98 int ret; 99 100 if (!len) 101 return 0; 102 103 if (len > RPMSG_KDRV_TP_DEMODEV_MESSAGE_DATA_LEN) 104 return -EINVAL; 105 106 msg = devm_kzalloc(&kddev->dev, sizeof(*msg), GFP_KERNEL); 107 if (!msg) 108 return -ENOMEM; 109 110 111 msg->header.message_type = RPMSG_KDRV_TP_DEMODEV_C2S_MESSAGE; 112 memcpy(msg->data, c2s_msg_data, len); 113 114 ret = rpmsg_kdrv_send_message(rpdev, kddev->device_id, msg, sizeof(*msg)); 115 if (ret) 116 dev_err(&kddev->dev, "%s: rpmsg_kdrv_send_message\n", __func__); 117 118 devm_kfree(&kddev->dev, msg); 119 return ret; 120 } 121 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org