Merge tag 'mm-stable-2022-12-13' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - More userfaultfs work from Peter Xu

 - Several convert-to-folios series from Sidhartha Kumar and Huang Ying

 - Some filemap cleanups from Vishal Moola

 - David Hildenbrand added the ability to selftest anon memory COW
   handling

 - Some cpuset simplifications from Liu Shixin

 - Addition of vmalloc tracing support by Uladzislau Rezki

 - Some pagecache folioifications and simplifications from Matthew
   Wilcox

 - A pagemap cleanup from Kefeng Wang: we have VM_ACCESS_FLAGS, so use
   it

 - Miguel Ojeda contributed some cleanups for our use of the
   __no_sanitize_thread__ gcc keyword.

   This series should have been in the non-MM tree, my bad

 - Naoya Horiguchi improved the interaction between memory poisoning and
   memory section removal for huge pages

 - DAMON cleanups and tuneups from SeongJae Park

 - Tony Luck fixed the handling of COW faults against poisoned pages

 - Peter Xu utilized the PTE marker code for handling swapin errors

 - Hugh Dickins reworked compound page mapcount handling, simplifying it
   and making it more efficient

 - Removal of the autonuma savedwrite infrastructure from Nadav Amit and
   David Hildenbrand

 - zram support for multiple compression streams from Sergey Senozhatsky

 - David Hildenbrand reworked the GUP code's R/O long-term pinning so
   that drivers no longer need to use the FOLL_FORCE workaround which
   didn't work very well anyway

 - Mel Gorman altered the page allocator so that local IRQs can remnain
   enabled during per-cpu page allocations

 - Vishal Moola removed the try_to_release_page() wrapper

 - Stefan Roesch added some per-BDI sysfs tunables which are used to
   prevent network block devices from dirtying excessive amounts of
   pagecache

 - David Hildenbrand did some cleanup and repair work on KSM COW
   breaking

 - Nhat Pham and Johannes Weiner have implemented writeback in zswap's
   zsmalloc backend

 - Brian Foster has fixed a longstanding corner-case oddity in
   file[map]_write_and_wait_range()

 - sparse-vmemmap changes for MIPS, LoongArch and NIOS2 from Feiyang
   Chen

 - Shiyang Ruan has done some work on fsdax, to make its reflink mode
   work better under xfstests. Better, but still not perfect

 - Christoph Hellwig has removed the .writepage() method from several
   filesystems. They only need .writepages()

 - Yosry Ahmed wrote a series which fixes the memcg reclaim target
   beancounting

 - David Hildenbrand has fixed some of our MM selftests for 32-bit
   machines

 - Many singleton patches, as usual

* tag 'mm-stable-2022-12-13' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (313 commits)
  mm/hugetlb: set head flag before setting compound_order in __prep_compound_gigantic_folio
  mm: mmu_gather: allow more than one batch of delayed rmaps
  mm: fix typo in struct pglist_data code comment
  kmsan: fix memcpy tests
  mm: add cond_resched() in swapin_walk_pmd_entry()
  mm: do not show fs mm pc for VM_LOCKONFAULT pages
  selftests/vm: ksm_functional_tests: fixes for 32bit
  selftests/vm: cow: fix compile warning on 32bit
  selftests/vm: madv_populate: fix missing MADV_POPULATE_(READ|WRITE) definitions
  mm/gup_test: fix PIN_LONGTERM_TEST_READ with highmem
  mm,thp,rmap: fix races between updates of subpages_mapcount
  mm: memcg: fix swapcached stat accounting
  mm: add nodes= arg to memory.reclaim
  mm: disable top-tier fallback to reclaim on proactive reclaim
  selftests: cgroup: make sure reclaim target memcg is unprotected
  selftests: cgroup: refactor proactive reclaim code to reclaim_until()
  mm: memcg: fix stale protection of reclaim target memcg
  mm/mmap: properly unaccount memory on mas_preallocate() failure
  omfs: remove ->writepage
  jfs: remove ->writepage
  ...

1 files changed, 18 insertions, 21 deletions

diff --git a/mm/swap_state.c b/mm/swap_state.c
index 438d0676c5be..2927507b43d8 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -303,15 +303,12 @@ void free_page_and_swap_cache(struct page *page)
  * Passed an array of pages, drop them all from swapcache and then release
  * them.  They are removed from the LRU and freed if this is their last use.
  */
-void free_pages_and_swap_cache(struct page **pages, int nr)
+void free_pages_and_swap_cache(struct encoded_page **pages, int nr)
 {
-	struct page **pagep = pages;
-	int i;
-
 	lru_add_drain();
-	for (i = 0; i < nr; i++)
-		free_swap_cache(pagep[i]);
-	release_pages(pagep, nr);
+	for (int i = 0; i < nr; i++)
+		free_swap_cache(encoded_page_ptr(pages[i]));
+	release_pages(pages, nr);
 }
 
 static inline bool swap_use_vma_readahead(void)
@@ -373,30 +370,28 @@ struct folio *swap_cache_get_folio(swp_entry_t entry,
 }
 
 /**
- * find_get_incore_page - Find and get a page from the page or swap caches.
+ * filemap_get_incore_folio - Find and get a folio from the page or swap caches.
  * @mapping: The address_space to search.
  * @index: The page cache index.
  *
- * This differs from find_get_page() in that it will also look for the
- * page in the swap cache.
+ * This differs from filemap_get_folio() in that it will also look for the
+ * folio in the swap cache.
  *
- * Return: The found page or %NULL.
+ * Return: The found folio or %NULL.
  */
-struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index)
+struct folio *filemap_get_incore_folio(struct address_space *mapping,
+		pgoff_t index)
 {
 	swp_entry_t swp;
 	struct swap_info_struct *si;
-	struct page *page = pagecache_get_page(mapping, index,
-						FGP_ENTRY | FGP_HEAD, 0);
+	struct folio *folio = __filemap_get_folio(mapping, index, FGP_ENTRY, 0);
 
-	if (!page)
-		return page;
-	if (!xa_is_value(page))
-		return find_subpage(page, index);
+	if (!xa_is_value(folio))
+		goto out;
 	if (!shmem_mapping(mapping))
 		return NULL;
 
-	swp = radix_to_swp_entry(page);
+	swp = radix_to_swp_entry(folio);
 	/* There might be swapin error entries in shmem mapping. */
 	if (non_swap_entry(swp))
 		return NULL;
@@ -404,9 +399,11 @@ struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index)
 	si = get_swap_device(swp);
 	if (!si)
 		return NULL;
-	page = find_get_page(swap_address_space(swp), swp_offset(swp));
+	index = swp_offset(swp);
+	folio = filemap_get_folio(swap_address_space(swp), index);
 	put_swap_device(si);
-	return page;
+out:
+	return folio;
 }
 
 struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,