Hi Minchan, I love your patch! Yet something to improve: [auto build test ERROR on linux/master] [also build test ERROR on linus/master v5.12-rc2 next-20210309] [cannot apply to hnaz-linux-mm/master] [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/Minchan-Kim/mm-disable-LRU-pagevec-during-the-migration-temporarily/20210309-131826 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 144c79ef33536b4ecb4951e07dbc1f2b7fa99d32 config: openrisc-randconfig-r026-20210308 (attached as .config) compiler: or1k-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 # https://github.com/0day-ci/linux/commit/dfca8699b8fb8cf3bed2297e261fca53c0fc523c git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Minchan-Kim/mm-disable-LRU-pagevec-during-the-migration-temporarily/20210309-131826 git checkout dfca8699b8fb8cf3bed2297e261fca53c0fc523c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=openrisc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): mm/swap.c:745:6: warning: no previous prototype for '__lru_add_drain_all' [-Wmissing-prototypes] 745 | void __lru_add_drain_all(bool force_all_cpus) | ^~~~~~~~~~~~~~~~~~~ mm/swap.c: In function '__lru_add_drain_all': >> mm/swap.c:827:7: error: implicit declaration of function 'has_bh_in_lru' [-Werror=implicit-function-declaration] 827 | has_bh_in_lru(cpu, NULL)) { | ^~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/has_bh_in_lru +827 mm/swap.c 744 745 void __lru_add_drain_all(bool force_all_cpus) 746 { 747 /* 748 * lru_drain_gen - Global pages generation number 749 * 750 * (A) Definition: global lru_drain_gen = x implies that all generations 751 * 0 < n <= x are already *scheduled* for draining. 752 * 753 * This is an optimization for the highly-contended use case where a 754 * user space workload keeps constantly generating a flow of pages for 755 * each CPU. 756 */ 757 static unsigned int lru_drain_gen; 758 static struct cpumask has_work; 759 static DEFINE_MUTEX(lock); 760 unsigned cpu, this_gen; 761 762 /* 763 * Make sure nobody triggers this path before mm_percpu_wq is fully 764 * initialized. 765 */ 766 if (WARN_ON(!mm_percpu_wq)) 767 return; 768 769 /* 770 * Guarantee pagevec counter stores visible by this CPU are visible to 771 * other CPUs before loading the current drain generation. 772 */ 773 smp_mb(); 774 775 /* 776 * (B) Locally cache global LRU draining generation number 777 * 778 * The read barrier ensures that the counter is loaded before the mutex 779 * is taken. It pairs with smp_mb() inside the mutex critical section 780 * at (D). 781 */ 782 this_gen = smp_load_acquire(&lru_drain_gen); 783 784 mutex_lock(&lock); 785 786 /* 787 * (C) Exit the draining operation if a newer generation, from another 788 * lru_add_drain_all(), was already scheduled for draining. Check (A). 789 */ 790 if (unlikely(this_gen != lru_drain_gen && !force_all_cpus)) 791 goto done; 792 793 /* 794 * (D) Increment global generation number 795 * 796 * Pairs with smp_load_acquire() at (B), outside of the critical 797 * section. Use a full memory barrier to guarantee that the new global 798 * drain generation number is stored before loading pagevec counters. 799 * 800 * This pairing must be done here, before the for_each_online_cpu loop 801 * below which drains the page vectors. 802 * 803 * Let x, y, and z represent some system CPU numbers, where x < y < z. 804 * Assume CPU #z is is in the middle of the for_each_online_cpu loop 805 * below and has already reached CPU #y's per-cpu data. CPU #x comes 806 * along, adds some pages to its per-cpu vectors, then calls 807 * lru_add_drain_all(). 808 * 809 * If the paired barrier is done at any later step, e.g. after the 810 * loop, CPU #x will just exit at (C) and miss flushing out all of its 811 * added pages. 812 */ 813 WRITE_ONCE(lru_drain_gen, lru_drain_gen + 1); 814 smp_mb(); 815 816 cpumask_clear(&has_work); 817 for_each_online_cpu(cpu) { 818 struct work_struct *work = &per_cpu(lru_add_drain_work, cpu); 819 820 if (force_all_cpus || 821 pagevec_count(&per_cpu(lru_pvecs.lru_add, cpu)) || 822 data_race(pagevec_count(&per_cpu(lru_rotate.pvec, cpu))) || 823 pagevec_count(&per_cpu(lru_pvecs.lru_deactivate_file, cpu)) || 824 pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) || 825 pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) || 826 need_activate_page_drain(cpu) || > 827 has_bh_in_lru(cpu, NULL)) { 828 INIT_WORK(work, lru_add_drain_per_cpu); 829 queue_work_on(cpu, mm_percpu_wq, work); 830 __cpumask_set_cpu(cpu, &has_work); 831 } 832 } 833 834 for_each_cpu(cpu, &has_work) 835 flush_work(&per_cpu(lru_add_drain_work, cpu)); 836 837 done: 838 mutex_unlock(&lock); 839 } 840 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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