Hi Vaibhav, I love your patch! Perhaps something to improve: [auto build test WARNING on staging/staging-testing] [also build test WARNING on v5.7-rc6 next-20200519] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Vaibhav-Agarwal/Enable-Greybus-A... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git cef077e6aa4c7dbe2f23e1201cf705f9540ec467 config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 135b877874fae96b4372c8a3fbfaa8ff44ff86e3) reproduce: 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 # 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 gbaudio_dapm_link_component_dai_widgets(struct snd_soc_card *card, ^ drivers/staging/greybus/audio_helper.c:59:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int gbaudio_dapm_link_component_dai_widgets(struct snd_soc_card *card, ^ static int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm, ^ drivers/staging/greybus/audio_helper.c:112:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm, ^ static int gbaudio_remove_component_controls(struct snd_soc_component *component, ^ drivers/staging/greybus/audio_helper.c:189:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int gbaudio_remove_component_controls(struct snd_soc_component *component, ^ static 3 warnings generated. vim +/gbaudio_dapm_link_component_dai_widgets +59 drivers/staging/greybus/audio_helper.c 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 58 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 @59 int gbaudio_dapm_link_component_dai_widgets(struct snd_soc_card *card, 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 60 struct snd_soc_dapm_context *dapm) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 61 { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 62 struct snd_soc_dapm_widget *dai_w; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 63 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 64 /* For each DAI widget... */ 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 65 list_for_each_entry(dai_w, &card->widgets, list) { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 66 if (dai_w->dapm != dapm) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 67 continue; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 68 switch (dai_w->id) { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 69 case snd_soc_dapm_dai_in: 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 70 case snd_soc_dapm_dai_out: 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 71 break; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 72 default: 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 73 continue; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 74 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 75 gbaudio_dapm_link_dai_widget(dai_w, card); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 76 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 77 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 78 return 0; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 79 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 80 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 81 static void gbaudio_dapm_free_path(struct snd_soc_dapm_path *path) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 82 { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 83 list_del(&path->list_node[SND_SOC_DAPM_DIR_IN]); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 84 list_del(&path->list_node[SND_SOC_DAPM_DIR_OUT]); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 85 list_del(&path->list_kcontrol); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 86 list_del(&path->list); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 87 kfree(path); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 88 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 89 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 90 static void gbaudio_dapm_free_widget(struct snd_soc_dapm_widget *w) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 91 { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 92 struct snd_soc_dapm_path *p, *next_p; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 93 enum snd_soc_dapm_direction dir; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 94 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 95 list_del(&w->list); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 96 /* 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 97 * remove source and sink paths associated to this widget. 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 98 * While removing the path, remove reference to it from both 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 99 * source and sink widgets so that path is removed only once. 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 100 */ 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 101 gbaudio_dapm_for_each_direction(dir) { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 102 snd_soc_dapm_widget_for_each_path_safe(w, dir, p, next_p) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 103 gbaudio_dapm_free_path(p); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 104 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 105 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 106 kfree(w->kcontrols); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 107 kfree_const(w->name); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 108 kfree_const(w->sname); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 109 kfree(w); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 110 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 111 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 @112 int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm, 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 113 const struct snd_soc_dapm_widget *widget, 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 114 int num) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 115 { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 116 int i; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 117 struct snd_soc_dapm_widget *w, *next_w; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 118 #ifdef CONFIG_DEBUG_FS 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 119 struct dentry *parent = dapm->debugfs_dapm; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 120 struct dentry *debugfs_w = NULL; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 121 #endif 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 122 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 123 mutex_lock(&dapm->card->dapm_mutex); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 124 for (i = 0; i < num; i++) { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 125 /* below logic can be optimized to identify widget pointer */ 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 126 list_for_each_entry_safe(w, next_w, &dapm->card->widgets, 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 127 list) { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 128 if (w->dapm != dapm) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 129 continue; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 130 if (!strcmp(w->name, widget->name)) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 131 break; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 132 w = NULL; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 133 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 134 if (!w) { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 135 dev_err(dapm->dev, "%s: widget not found\n", 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 136 widget->name); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 137 return -EINVAL; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 138 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 139 widget++; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 140 #ifdef CONFIG_DEBUG_FS 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 141 if (!parent) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 142 debugfs_w = debugfs_lookup(w->name, parent); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 143 debugfs_remove(debugfs_w); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 144 debugfs_w = NULL; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 145 #endif 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 146 gbaudio_dapm_free_widget(w); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 147 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 148 mutex_unlock(&dapm->card->dapm_mutex); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 149 return 0; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 150 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 151 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 152 static int gbaudio_remove_controls(struct snd_card *card, struct device *dev, 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 153 const struct snd_kcontrol_new *controls, 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 154 int num_controls, const char *prefix) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 155 { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 156 int i, err; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 157 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 158 for (i = 0; i < num_controls; i++) { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 159 const struct snd_kcontrol_new *control = &controls[i]; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 160 struct snd_ctl_elem_id id; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 161 struct snd_kcontrol *kctl; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 162 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 163 if (prefix) 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 164 snprintf(id.name, sizeof(id.name), "%s %s", prefix, 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 165 control->name); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 166 else 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 167 strlcpy(id.name, control->name, sizeof(id.name)); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 168 id.numid = 0; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 169 id.iface = control->iface; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 170 id.device = control->device; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 171 id.subdevice = control->subdevice; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 172 id.index = control->index; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 173 kctl = snd_ctl_find_id(card, &id); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 174 if (!kctl) { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 175 dev_err(dev, "%d: Failed to find %s\n", err, 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 176 control->name); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 177 return -ENOENT; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 178 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 179 err = snd_ctl_remove(card, kctl); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 180 if (err < 0) { 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 181 dev_err(dev, "%d: Failed to remove %s\n", err, 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 182 control->name); 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 183 return err; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 184 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 185 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 186 return 0; 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 187 } 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 188 94b08a33fd1bca Vaibhav Agarwal 2020-05-17 @189 int gbaudio_remove_component_controls(struct snd_soc_component *component, :::::: The code at line 59 was first introduced by commit :::::: 94b08a33fd1bcaa8660430f8107b5c7bbfbca3b4 staging: greybus: audio: Add helper APIs for dynamic audio modules :::::: TO: Vaibhav Agarwal <vaibhav.sr(a)gmail.com&gt; :::::: CC: 0day robot <lkp(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org