[kbuild-all] Re: [PATCH] mm/vmstat: add event for ksm swapping in copy

Hi, Thank you for the patch! Yet something to improve: [auto build test ERROR on hnaz-mm/master] url: https://github.com/0day-ci/linux/commits/cgel-zte-gmail-com/mm-vmstat-add... base: https://github.com/hnaz/linux-mm master config: alpha-buildonly-randconfig-r004-20220112 (https://download.01.org/0day-ci/archive/20220112/202201122306.EC6LSwot-lk...) compiler: alpha-linux-gcc (GCC) 11.2.0 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/56a4520e557228d8383f27b6aef54b2f9... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review cgel-zte-gmail-com/mm-vmstat-add-event-for-ksm-swapping-in-copy/20220112-195303 git checkout 56a4520e557228d8383f27b6aef54b2f931a0588 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=alpha SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): mm/ksm.c: In function 'ksm_might_need_to_copy': 2597 | count_vm_event(KSM_SWPIN_COPY); | ^~~~~~~~~~~~~~ mm/ksm.c:2597:32: note: each undeclared identifier is reported only once for each function it appears in vim +/KSM_SWPIN_COPY +2597 mm/ksm.c 2565 2566 struct page *ksm_might_need_to_copy(struct page *page, 2567 struct vm_area_struct *vma, unsigned long address) 2568 { 2569 struct anon_vma *anon_vma = page_anon_vma(page); 2570 struct page *new_page; 2571 2572 if (PageKsm(page)) { 2573 if (page_stable_node(page) && 2574 !(ksm_run & KSM_RUN_UNMERGE)) 2575 return page; /* no need to copy it */ 2576 } else if (!anon_vma) { 2577 return page; /* no need to copy it */ 2578 } else if (anon_vma->root == vma->anon_vma->root && 2579 page->index == linear_page_index(vma, address)) { 2580 return page; /* still no need to copy it */ 2581 } 2582 if (!PageUptodate(page)) 2583 return page; /* let do_swap_page report the error */ 2584 2585 new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); 2586 if (new_page && 2587 mem_cgroup_charge(page_folio(new_page), vma->vm_mm, GFP_KERNEL)) { 2588 put_page(new_page); 2589 new_page = NULL; 2590 } 2591 if (new_page) { 2592 copy_user_highpage(new_page, page, address, vma); 2593 2594 SetPageDirty(new_page); 2595 __SetPageUptodate(new_page); 2596 __SetPageLocked(new_page); 2598 } 2599 2600 return new_page; 2601 } 2602 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org