tree: https://github.com/superna9999/linux amlogic/v5.17/g12-dsi head: 62dac9179f2937dc08bffe08d15c6846bc4aedb4 commit: d521159dd8a996678230b50e4ecafcdf50648c52 [10/23] fixup! WIP: drm/meson: add DSI encoder config: arm-randconfig-r033-20211210 (https://download.01.org/0day-ci/archive/20211211/202112110644.NcoPvA8p-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/superna9999/linux/commit/d521159dd8a996678230b50e4ecaf... git remote add superna9999 https://github.com/superna9999/linux git fetch --no-tags superna9999 amlogic/v5.17/g12-dsi git checkout d521159dd8a996678230b50e4ecafcdf50648c52 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/drm/meson/ 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 >>): dev_err(priv->dev, "Failed to find DSI transceiver bridge: %d\n", ret); ^~~ include/linux/dev_printk.h:144:65: note: expanded from macro 'dev_err' dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__) ^~~~~~~~~~~ include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap' _p_func(dev, fmt, ##__VA_ARGS__); \ ^~~~~~~~~~~ drivers/gpu/drm/meson/meson_encoder_dsi.c:108:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 1 warning generated. vim +/ret +125 drivers/gpu/drm/meson/meson_encoder_dsi.c 6b197be782e0410 Neil Armstrong 2021-12-09 103 6b197be782e0410 Neil Armstrong 2021-12-09 104 int meson_encoder_dsi_init(struct meson_drm *priv) 6b197be782e0410 Neil Armstrong 2021-12-09 105 { 6b197be782e0410 Neil Armstrong 2021-12-09 106 struct meson_encoder_dsi *meson_encoder_dsi; 6b197be782e0410 Neil Armstrong 2021-12-09 107 struct device_node *remote; 6b197be782e0410 Neil Armstrong 2021-12-09 108 int ret; 6b197be782e0410 Neil Armstrong 2021-12-09 109 6b197be782e0410 Neil Armstrong 2021-12-09 110 DRM_DEBUG_DRIVER("\n"); 6b197be782e0410 Neil Armstrong 2021-12-09 111 6b197be782e0410 Neil Armstrong 2021-12-09 112 meson_encoder_dsi = devm_kzalloc(priv->dev, sizeof(*meson_encoder_dsi), GFP_KERNEL); 6b197be782e0410 Neil Armstrong 2021-12-09 113 if (!meson_encoder_dsi) 6b197be782e0410 Neil Armstrong 2021-12-09 114 return -ENOMEM; 6b197be782e0410 Neil Armstrong 2021-12-09 115 6b197be782e0410 Neil Armstrong 2021-12-09 116 /* DSI Transceiver Bridge */ 6b197be782e0410 Neil Armstrong 2021-12-09 117 remote = of_graph_get_remote_node(priv->dev->of_node, 1, 0); 6b197be782e0410 Neil Armstrong 2021-12-09 118 if (!remote) { 6b197be782e0410 Neil Armstrong 2021-12-09 119 dev_err(priv->dev, "DSI transceiver device is disabled"); 6b197be782e0410 Neil Armstrong 2021-12-09 120 return 0; 6b197be782e0410 Neil Armstrong 2021-12-09 121 } 6b197be782e0410 Neil Armstrong 2021-12-09 122 6b197be782e0410 Neil Armstrong 2021-12-09 123 meson_encoder_dsi->next_bridge = of_drm_find_bridge(remote); 6b197be782e0410 Neil Armstrong 2021-12-09 124 if (!meson_encoder_dsi->next_bridge) { 6b197be782e0410 Neil Armstrong 2021-12-09 @125 dev_err(priv->dev, "Failed to find DSI transceiver bridge: %d\n", ret); :::::: The code at line 125 was first introduced by commit :::::: 6b197be782e0410bb911b74fb152daefccce6a29 WIP: drm/meson: add DSI encoder :::::: TO: Neil Armstrong <narmstrong(a)baylibre.com&gt; :::::: CC: Neil Armstrong <narmstrong(a)baylibre.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org