Re: [PATCH] mm: page_alloc: consolidate free page accounting fix 3
From: kernel test robot
Date: Tue Apr 09 2024 - 17:26:27 EST
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
--
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