Hi Takashi, I love your patch! Perhaps something to improve: [auto build test WARNING on tiwai-sound/for-next] [also build test WARNING on linus/master v5.19-rc6 next-20220715] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Takashi-Iwai/ALSA-Drop-async-signal-support/20220716-211853 base: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next config: i386-randconfig-a001 (https://download.01.org/0day-ci/archive/20220717/202207170009.xmmdeeBR-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.3.0-3) 11.3.0 reproduce (this is a W=1 build): # https://github.com/intel-lab-lkp/linux/commit/6705167eb6bf093c8a099fa16c0aeb5f3da0dfba git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Takashi-Iwai/ALSA-Drop-async-signal-support/20220716-211853 git checkout 6705167eb6bf093c8a099fa16c0aeb5f3da0dfba # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash sound/core/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): sound/core/pcm_lib.c: In function 'snd_pcm_period_elapsed_under_stream_lock': >> sound/core/pcm_lib.c:1810:33: warning: variable 'runtime' set but not used [-Wunused-but-set-variable] 1810 | struct snd_pcm_runtime *runtime; | ^~~~~~~ vim +/runtime +1810 sound/core/pcm_lib.c e88e8ae639a490 Takashi Iwai 2006-04-28 1780 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1781 /** 47271b1b98c980 Takashi Sakamoto 2021-06-10 1782 * snd_pcm_period_elapsed_under_stream_lock() - update the status of runtime for the next period 47271b1b98c980 Takashi Sakamoto 2021-06-10 1783 * under acquired lock of PCM substream. 47271b1b98c980 Takashi Sakamoto 2021-06-10 1784 * @substream: the instance of pcm substream. 47271b1b98c980 Takashi Sakamoto 2021-06-10 1785 * 47271b1b98c980 Takashi Sakamoto 2021-06-10 1786 * This function is called when the batch of audio data frames as the same size as the period of 47271b1b98c980 Takashi Sakamoto 2021-06-10 1787 * buffer is already processed in audio data transmission. 47271b1b98c980 Takashi Sakamoto 2021-06-10 1788 * 47271b1b98c980 Takashi Sakamoto 2021-06-10 1789 * The call of function updates the status of runtime with the latest position of audio data 47271b1b98c980 Takashi Sakamoto 2021-06-10 1790 * transmission, checks overrun and underrun over buffer, awaken user processes from waiting for 47271b1b98c980 Takashi Sakamoto 2021-06-10 1791 * available audio data frames, sampling audio timestamp, and performs stop or drain the PCM 47271b1b98c980 Takashi Sakamoto 2021-06-10 1792 * substream according to configured threshold. 47271b1b98c980 Takashi Sakamoto 2021-06-10 1793 * 47271b1b98c980 Takashi Sakamoto 2021-06-10 1794 * The function is intended to use for the case that PCM driver operates audio data frames under 47271b1b98c980 Takashi Sakamoto 2021-06-10 1795 * acquired lock of PCM substream; e.g. in callback of any operation of &snd_pcm_ops in process 47271b1b98c980 Takashi Sakamoto 2021-06-10 1796 * context. In any interrupt context, it's preferrable to use ``snd_pcm_period_elapsed()`` instead 47271b1b98c980 Takashi Sakamoto 2021-06-10 1797 * since lock of PCM substream should be acquired in advance. ^1da177e4c3f41 Linus Torvalds 2005-04-16 1798 * 47271b1b98c980 Takashi Sakamoto 2021-06-10 1799 * Developer should pay enough attention that some callbacks in &snd_pcm_ops are done by the call of 47271b1b98c980 Takashi Sakamoto 2021-06-10 1800 * function: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1801 * 47271b1b98c980 Takashi Sakamoto 2021-06-10 1802 * - .pointer - to retrieve current position of audio data transmission by frame count or XRUN state. 47271b1b98c980 Takashi Sakamoto 2021-06-10 1803 * - .trigger - with SNDRV_PCM_TRIGGER_STOP at XRUN or DRAINING state. 47271b1b98c980 Takashi Sakamoto 2021-06-10 1804 * - .get_time_info - to retrieve audio time stamp if needed. 47271b1b98c980 Takashi Sakamoto 2021-06-10 1805 * 47271b1b98c980 Takashi Sakamoto 2021-06-10 1806 * Even if more than one periods have elapsed since the last call, you have to call this only once. ^1da177e4c3f41 Linus Torvalds 2005-04-16 1807 */ 47271b1b98c980 Takashi Sakamoto 2021-06-10 1808 void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1809 { 877211f5e1b119 Takashi Iwai 2005-11-17 @1810 struct snd_pcm_runtime *runtime; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1811 f5cdc9d4003a2f paulhsia 2019-11-13 1812 if (PCM_RUNTIME_CHECK(substream)) 47271b1b98c980 Takashi Sakamoto 2021-06-10 1813 return; f5cdc9d4003a2f paulhsia 2019-11-13 1814 runtime = substream->runtime; f5cdc9d4003a2f paulhsia 2019-11-13 1815 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1816 if (!snd_pcm_running(substream) || f240406babfe15 Jaroslav Kysela 2010-01-05 1817 snd_pcm_update_hw_ptr0(substream, 1) < 0) 6705167eb6bf09 Takashi Iwai 2022-07-15 1818 return; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1819 -- 0-DAY CI Kernel Test Service https://01.org/lkp
