Hi Chanho, I love your patch! Yet something to improve: [auto build test ERROR on sound/for-next] [also build test ERROR on v4.20-rc3 next-20181123] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Chanho-Min/ALSA-pcm-Fix-starvation-on-down_write_nonblock/20181124-182630 base: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next config: x86_64-randconfig-x001-201846 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All errors (new ones prefixed by >>): sound/core/pcm_native.c: In function 'down_write_nonblock': >> sound/core/pcm_native.c:99:3: error: implicit declaration of function 'msleep' [-Werror=implicit-function-declaration] msleep(1); ^~~~~~ cc1: some warnings being treated as errors vim +/msleep +99 sound/core/pcm_native.c 89 90 /* Writer in rwsem may block readers even during its waiting in queue, 91 * and this may lead to a deadlock when the code path takes read sem 92 * twice (e.g. one in snd_pcm_action_nonatomic() and another in 93 * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to 94 * spin until it gets the lock. 95 */ 96 static inline void down_write_nonblock(struct rw_semaphore *lock) 97 { 98 while (!down_write_trylock(lock)) > 99 msleep(1); 100 } 101 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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