Hi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on next-20220310] url: https://github.com/0day-ci/linux/commits/cgel-zte-gmail-com/ksm-Count-ksm-merging-pages-for-each-process/20220314-095633 base: 71941773e143369a73c9c4a3b62fbb60736a1182 config: s390-randconfig-s031-20220313 (https://download.01.org/0day-ci/archive/20220315/202203150131.oDjproo7-lkp@xxxxxxxxx/config) compiler: s390-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/64577121c010929e9f2604053f4b96402d3089a8 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review cgel-zte-gmail-com/ksm-Count-ksm-merging-pages-for-each-process/20220314-095633 git checkout 64577121c010929e9f2604053f4b96402d3089a8 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) >> mm/ksm.c:647:23: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *owner @@ got struct task_struct [noderef] __rcu *owner @@ mm/ksm.c:647:23: sparse: expected struct task_struct *owner mm/ksm.c:647:23: sparse: got struct task_struct [noderef] __rcu *owner mm/ksm.c:805:23: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *owner @@ got struct task_struct [noderef] __rcu *owner @@ mm/ksm.c:805:23: sparse: expected struct task_struct *owner mm/ksm.c:805:23: sparse: got struct task_struct [noderef] __rcu *owner mm/ksm.c:2038:15: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *owner @@ got struct task_struct [noderef] __rcu *owner @@ mm/ksm.c:2038:15: sparse: expected struct task_struct *owner mm/ksm.c:2038:15: sparse: got struct task_struct [noderef] __rcu *owner mm/ksm.c: note: in included file: include/linux/rmap.h:248:28: sparse: sparse: context imbalance in 'write_protect_page' - unexpected unlock vim +647 mm/ksm.c 635 636 /* check it's not STABLE_NODE_CHAIN or negative */ 637 BUG_ON(stable_node->rmap_hlist_len < 0); 638 639 hlist_for_each_entry(rmap_item, &stable_node->hlist, hlist) { 640 if (rmap_item->hlist.next) 641 ksm_pages_sharing--; 642 else 643 ksm_pages_shared--; 644 645 #ifdef CONFIG_MEMCG /*Condition of mm_struct with owner*/ 646 BUG_ON(rmap_item->mm == NULL); > 647 owner = rmap_item->mm->owner; 648 /* In case that the process of mm may be killed or exit */ 649 if (owner) 650 owner->ksm_merging_pages--; 651 #endif 652 VM_BUG_ON(stable_node->rmap_hlist_len <= 0); 653 stable_node->rmap_hlist_len--; 654 put_anon_vma(rmap_item->anon_vma); 655 rmap_item->address &= PAGE_MASK; 656 cond_resched(); 657 } 658 659 /* 660 * We need the second aligned pointer of the migrate_nodes 661 * list_head to stay clear from the rb_parent_color union 662 * (aligned and different than any node) and also different 663 * from &migrate_nodes. This will verify that future list.h changes 664 * don't break STABLE_NODE_DUP_HEAD. Only recent gcc can handle it. 665 */ 666 BUILD_BUG_ON(STABLE_NODE_DUP_HEAD <= &migrate_nodes); 667 BUILD_BUG_ON(STABLE_NODE_DUP_HEAD >= &migrate_nodes + 1); 668 669 if (stable_node->head == &migrate_nodes) 670 list_del(&stable_node->list); 671 else 672 stable_node_dup_del(stable_node); 673 free_stable_node(stable_node); 674 } 675 --- 0-DAY CI Kernel Test Service https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
