Hi Philipp, I love your patch! Perhaps something to improve: [auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on drm-tip/drm-tip linus/master v5.9-rc2 next-20200827] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Philipp-Zabel/drm-add-drmm_encoder_alloc/20200828-000957 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: arm-randconfig-r003-20200827 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c10e63677f5d20f18010f8f68c631ddc97546f7d) 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/drm_encoder.c:160:6: warning: variable 'ap' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (name) ^~~~ drivers/gpu/drm/drm_encoder.c:162:68: note: uninitialized use occurs here ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap); ^~ drivers/gpu/drm/drm_encoder.c:160:2: note: remove the 'if' if its condition is always true if (name) ^~~~~~~~~ drivers/gpu/drm/drm_encoder.c:157:2: note: variable 'ap' is declared here va_list ap; ^ drivers/gpu/drm/drm_encoder.c:227:6: warning: variable 'ap' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (name) ^~~~ drivers/gpu/drm/drm_encoder.c:229:68: note: uninitialized use occurs here ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap); ^~ drivers/gpu/drm/drm_encoder.c:227:2: note: remove the 'if' if its condition is always true if (name) ^~~~~~~~~ drivers/gpu/drm/drm_encoder.c:215:2: note: variable 'ap' is declared here va_list ap; ^ 2 warnings generated. # https://github.com/0day-ci/linux/commit/582208cffad6661715216bc2fd36f382012f8419 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Philipp-Zabel/drm-add-drmm_encoder_alloc/20200828-000957 git checkout 582208cffad6661715216bc2fd36f382012f8419 vim +160 drivers/gpu/drm/drm_encoder.c 136 137 /** 138 * drm_encoder_init - Init a preallocated encoder 139 * @dev: drm device 140 * @encoder: the encoder to init 141 * @funcs: callbacks for this encoder 142 * @encoder_type: user visible type of the encoder 143 * @name: printf style format string for the encoder name, or NULL for default name 144 * 145 * Initializes a preallocated encoder. Encoder should be subclassed as part of 146 * driver encoder objects. At driver unload time drm_encoder_cleanup() should be 147 * called from the driver's &drm_encoder_funcs.destroy hook. 148 * 149 * Returns: 150 * Zero on success, error code on failure. 151 */ 152 int drm_encoder_init(struct drm_device *dev, 153 struct drm_encoder *encoder, 154 const struct drm_encoder_funcs *funcs, 155 int encoder_type, const char *name, ...) 156 { 157 va_list ap; 158 int ret; 159 > 160 if (name) 161 va_start(ap, name); 162 ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap); 163 if (name) 164 va_end(ap); 165 166 return ret; 167 } 168 EXPORT_SYMBOL(drm_encoder_init); 169 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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