Hi Kuninori, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on asoc/for-next] [also build test WARNING on next-20200519] [cannot apply to sound/for-next v5.7-rc6] [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/Kuninori-Morimoto/ASoC-add-soc-l... base: https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next config: parisc-randconfig-r011-20200521 (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 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 <<): In file included from arch/parisc/include/asm/io.h:6, from include/linux/io.h:13, from include/linux/irq.h:20, from arch/parisc/include/asm/hardirq.h:13, from include/linux/hardirq.h:9, from include/linux/interrupt.h:11, from include/sound/soc.h:18, from sound/soc/soc-link.c:8: include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full': arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 96 | pte_t old_pte; | ^~~~~~~ arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at' 322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0)) | ^~~~~~~~~~ include/asm-generic/pgtable.h:202:2: note: in expansion of macro 'pte_clear' 202 | pte_clear(mm, address, ptep); | ^~~~~~~~~ include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit': arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 96 | pte_t old_pte; | ^~~~~~~ include/asm-generic/pgtable.h:641:2: note: in expansion of macro 'set_pte_at' 641 | set_pte_at(vma->vm_mm, addr, ptep, pte); | ^~~~~~~~~~ sound/soc/soc-link.c: At top level: sound/soc/soc-link.c:28:5: warning: no previous prototype for 'snd_soc_link_init' [-Wmissing-prototypes] 28 | int snd_soc_link_init(struct snd_soc_pcm_runtime *rtd) | ^~~~~~~~~~~~~~~~~ sound/soc/soc-link.c:38:5: warning: no previous prototype for 'snd_soc_link_be_hw_params_fixup' [-Wmissing-prototypes] 38 | int snd_soc_link_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ sound/soc/soc-link.c:49:5: warning: no previous prototype for 'snd_soc_link_startup' [-Wmissing-prototypes] 49 | int snd_soc_link_startup(struct snd_pcm_substream *substream) | ^~~~~~~~~~~~~~~~~~~~ sound/soc/soc-link.c:61:6: warning: no previous prototype for 'snd_soc_link_shutdown' [-Wmissing-prototypes] 61 | void snd_soc_link_shutdown(struct snd_pcm_substream *substream) | ^~~~~~~~~~~~~~~~~~~~~ sound/soc/soc-link.c:70:5: warning: no previous prototype for 'snd_soc_link_prepare' [-Wmissing-prototypes] 70 | int snd_soc_link_prepare(struct snd_pcm_substream *substream) | ^~~~~~~~~~~~~~~~~~~~ sound/soc/soc-link.c:82:5: warning: no previous prototype for 'snd_soc_link_hw_params' [-Wmissing-prototypes] 82 | int snd_soc_link_hw_params(struct snd_pcm_substream *substream, | ^~~~~~~~~~~~~~~~~~~~~~ sound/soc/soc-link.c:95:6: warning: no previous prototype for 'snd_soc_link_hw_free' [-Wmissing-prototypes] 95 | void snd_soc_link_hw_free(struct snd_pcm_substream *substream) | ^~~~~~~~~~~~~~~~~~~~ sound/soc/soc-link.c:104:5: warning: no previous prototype for 'snd_soc_link_trigger' [-Wmissing-prototypes] 104 | int snd_soc_link_trigger(struct snd_pcm_substream *substream, int cmd) | ^~~~~~~~~~~~~~~~~~~~ << from sound/soc/soc-link.c:8: 116 | int snd_soc_link_compr_startup(struct snd_compr_stream *cstream) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/snd_soc_link_compr_startup +116 sound/soc/soc-link.c 115 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org