Hi Baolin, kernel test robot noticed the following build errors: url: https://github.com/intel-lab-lkp/linux/commits/UPDATE-20240409-154935/Johannes-Weiner/mm-page_alloc-remove-pcppage-migratetype-caching/20240321-020814 base: the 10th patch of https://lore.kernel.org/r/20240320180429.678181-11-hannes%40cmpxchg.org patch link: https://lore.kernel.org/r/a2a48baca69f103aa431fd201f8a06e3b95e203d.1712648441.git.baolin.wang%40linux.alibaba.com patch subject: [PATCH] mm: page_alloc: consolidate free page accounting fix 3 config: x86_64-rhel-8.3 (https://download.01.org/0day-ci/archive/20240410/202404100551.aq0YQFuT-lkp@xxxxxxxxx/config) compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240410/202404100551.aq0YQFuT-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202404100551.aq0YQFuT-lkp@xxxxxxxxx/ All error/warnings (new ones prefixed by >>): mm/page_alloc.c: In function '__free_one_page': >> mm/page_alloc.c:808:43: error: passing argument 1 of 'account_freepages' from incompatible pointer type [-Werror=incompatible-pointer-types] 808 | account_freepages(zone, -(1 << order), migratetype); | ^~~~ | | | struct zone * mm/page_alloc.c:645:51: note: expected 'struct page *' but argument is of type 'struct zone *' 645 | static inline void account_freepages(struct page *page, struct zone *zone, | ~~~~~~~~~~~~~^~~~ >> mm/page_alloc.c:808:49: warning: passing argument 2 of 'account_freepages' makes pointer from integer without a cast [-Wint-conversion] 808 | account_freepages(zone, -(1 << order), migratetype); | ^~~~~~~~~~~~~ | | | int mm/page_alloc.c:645:70: note: expected 'struct zone *' but argument is of type 'int' 645 | static inline void account_freepages(struct page *page, struct zone *zone, | ~~~~~~~~~~~~~^~~~ >> mm/page_alloc.c:808:25: error: too few arguments to function 'account_freepages' 808 | account_freepages(zone, -(1 << order), migratetype); | ^~~~~~~~~~~~~~~~~ mm/page_alloc.c:645:20: note: declared here 645 | static inline void account_freepages(struct page *page, struct zone *zone, | ^~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/account_freepages +808 mm/page_alloc.c 759 760 /* 761 * Freeing function for a buddy system allocator. 762 * 763 * The concept of a buddy system is to maintain direct-mapped table 764 * (containing bit values) for memory blocks of various "orders". 765 * The bottom level table contains the map for the smallest allocatable 766 * units of memory (here, pages), and each level above it describes 767 * pairs of units from the levels below, hence, "buddies". 768 * At a high level, all that happens here is marking the table entry 769 * at the bottom level available, and propagating the changes upward 770 * as necessary, plus some accounting needed to play nicely with other 771 * parts of the VM system. 772 * At each level, we keep a list of pages, which are heads of continuous 773 * free pages of length of (1 << order) and marked with PageBuddy. 774 * Page's order is recorded in page_private(page) field. 775 * So when we are allocating or freeing one, we can derive the state of the 776 * other. That is, if we allocate a small block, and both were 777 * free, the remainder of the region must be split into blocks. 778 * If a block is freed, and its buddy is also free, then this 779 * triggers coalescing into a block of larger size. 780 * 781 * -- nyc 782 */ 783 784 static inline void __free_one_page(struct page *page, 785 unsigned long pfn, 786 struct zone *zone, unsigned int order, 787 int migratetype, fpi_t fpi_flags) 788 { 789 struct capture_control *capc = task_capc(zone); 790 unsigned long buddy_pfn = 0; 791 unsigned long combined_pfn; 792 struct page *buddy; 793 bool to_tail; 794 795 VM_BUG_ON(!zone_is_initialized(zone)); 796 VM_BUG_ON_PAGE(page->flags & PAGE_FLAGS_CHECK_AT_PREP, page); 797 798 VM_BUG_ON(migratetype == -1); 799 VM_BUG_ON_PAGE(pfn & ((1 << order) - 1), page); 800 VM_BUG_ON_PAGE(bad_range(zone, page), page); 801 802 account_freepages(page, zone, 1 << order, migratetype); 803 804 while (order < MAX_PAGE_ORDER) { 805 int buddy_mt = migratetype; 806 807 if (compaction_capture(capc, page, order, migratetype)) { > 808 account_freepages(zone, -(1 << order), migratetype); 809 return; 810 } 811 812 buddy = find_buddy_page_pfn(page, pfn, order, &buddy_pfn); 813 if (!buddy) 814 goto done_merging; 815 816 if (unlikely(order >= pageblock_order)) { 817 /* 818 * We want to prevent merge between freepages on pageblock 819 * without fallbacks and normal pageblock. Without this, 820 * pageblock isolation could cause incorrect freepage or CMA 821 * accounting or HIGHATOMIC accounting. 822 */ 823 buddy_mt = get_pfnblock_migratetype(buddy, buddy_pfn); 824 825 if (migratetype != buddy_mt && 826 (!migratetype_is_mergeable(migratetype) || 827 !migratetype_is_mergeable(buddy_mt))) 828 goto done_merging; 829 } 830 831 /* 832 * Our buddy is free or it is CONFIG_DEBUG_PAGEALLOC guard page, 833 * merge with it and move up one order. 834 */ 835 if (page_is_guard(buddy)) 836 clear_page_guard(zone, buddy, order); 837 else 838 __del_page_from_free_list(buddy, zone, order, buddy_mt); 839 840 if (unlikely(buddy_mt != migratetype)) { 841 /* 842 * Match buddy type. This ensures that an 843 * expand() down the line puts the sub-blocks 844 * on the right freelists. 845 */ 846 set_pageblock_migratetype(buddy, migratetype); 847 } 848 849 combined_pfn = buddy_pfn & pfn; 850 page = page + (combined_pfn - pfn); 851 pfn = combined_pfn; 852 order++; 853 } 854 855 done_merging: 856 set_buddy_order(page, order); 857 858 if (fpi_flags & FPI_TO_TAIL) 859 to_tail = true; 860 else if (is_shuffle_order(order)) 861 to_tail = shuffle_pick_tail(); 862 else 863 to_tail = buddy_merge_likely(pfn, buddy_pfn, page, order); 864 865 __add_to_free_list(page, zone, order, migratetype, to_tail); 866 867 /* Notify page reporting subsystem of freed page */ 868 if (!(fpi_flags & FPI_SKIP_REPORT_NOTIFY)) 869 page_reporting_notify_free(order); 870 } 871 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
