Hi Jiaxun, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.9-rc1 next-20200817] [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/Jiaxun-Yang/R4000-clock-enhancem... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5 config: mips-allyesconfig (attached as .config) compiler: mips-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 28 | void synchronise_count_master(void *unused) | ^~~~~~~~~~~~~~~~~~~~~~~~ # https://github.com/0day-ci/linux/commit/6c760a310d6f07efede56e732f3de2e2a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jiaxun-Yang/R4000-clock-enhancements-for-Loongson/20200817-115351 git checkout 6c760a310d6f07efede56e732f3de2e2a944e361 vim +/synchronise_count_master +28 arch/mips/kernel/sync-r4k.c 27 29 { 30 unsigned long flags; 31 long delta; 32 int i; 33 34 if (atomic_read(&sync_stage) != STAGE_START) 35 BUG(); 36 37 local_irq_save(flags); 38 39 cur_count = read_c0_count(); 40 smp_wmb(); 41 atomic_inc(&sync_stage); /* inc to STAGE_MASTER_READY */ 42 43 for (i = 0; i < MAX_LOOPS; i++) { 44 cur_count = read_c0_count(); 45 smp_wmb(); 46 if (atomic_read(&sync_stage) == STAGE_SLAVE_SYNCED) 47 break; 48 } 49 50 delta = read_c0_count() - fini_count; 51 52 local_irq_restore(flags); 53 54 if (i == MAX_LOOPS) 55 pr_err("sync-r4k: Master: synchronise timeout\n"); 56 else 57 pr_info("sync-r4k: Master: synchronise succeed, maximum delta: %ld\n", delta); 58 59 return; 60 } 61 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org