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diff --git a/mm/internal.h b/mm/internal.h
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* internal.h: mm/ internal definitions
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+#ifndef __MM_INTERNAL_H
+#define __MM_INTERNAL_H
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/rmap.h>
+#include <linux/tracepoint-defs.h>
+
+struct folio_batch;
+
+/*
+ * The set of flags that only affect watermark checking and reclaim
+ * behaviour. This is used by the MM to obey the caller constraints
+ * about IO, FS and watermark checking while ignoring placement
+ * hints such as HIGHMEM usage.
+ */
+#define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\
+ __GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NOFAIL|\
+ __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\
+ __GFP_NOLOCKDEP)
+
+/* The GFP flags allowed during early boot */
+#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS))
+
+/* Control allocation cpuset and node placement constraints */
+#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
+
+/* Do not use these with a slab allocator */
+#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
+
+/*
+ * Different from WARN_ON_ONCE(), no warning will be issued
+ * when we specify __GFP_NOWARN.
+ */
+#define WARN_ON_ONCE_GFP(cond, gfp) ({ \
+ static bool __section(".data.once") __warned; \
+ int __ret_warn_once = !!(cond); \
+ \
+ if (unlikely(!(gfp & __GFP_NOWARN) && __ret_warn_once && !__warned)) { \
+ __warned = true; \
+ WARN_ON(1); \
+ } \
+ unlikely(__ret_warn_once); \
+})
+
+void page_writeback_init(void);
+
+/*
+ * If a 16GB hugetlb folio were mapped by PTEs of all of its 4kB pages,
+ * its nr_pages_mapped would be 0x400000: choose the COMPOUND_MAPPED bit
+ * above that range, instead of 2*(PMD_SIZE/PAGE_SIZE). Hugetlb currently
+ * leaves nr_pages_mapped at 0, but avoid surprise if it participates later.
+ */
+#define COMPOUND_MAPPED 0x800000
+#define FOLIO_PAGES_MAPPED (COMPOUND_MAPPED - 1)
+
+/*
+ * Flags passed to __show_mem() and show_free_areas() to suppress output in
+ * various contexts.
+ */
+#define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
+
+/*
+ * How many individual pages have an elevated _mapcount. Excludes
+ * the folio's entire_mapcount.
+ */
+static inline int folio_nr_pages_mapped(struct folio *folio)
+{
+ return atomic_read(&folio->_nr_pages_mapped) & FOLIO_PAGES_MAPPED;
+}
+
+static inline void *folio_raw_mapping(struct folio *folio)
+{
+ unsigned long mapping = (unsigned long)folio->mapping;
+
+ return (void *)(mapping & ~PAGE_MAPPING_FLAGS);
+}
+
+void __acct_reclaim_writeback(pg_data_t *pgdat, struct folio *folio,
+ int nr_throttled);
+static inline void acct_reclaim_writeback(struct folio *folio)
+{
+ pg_data_t *pgdat = folio_pgdat(folio);
+ int nr_throttled = atomic_read(&pgdat->nr_writeback_throttled);
+
+ if (nr_throttled)
+ __acct_reclaim_writeback(pgdat, folio, nr_throttled);
+}
+
+static inline void wake_throttle_isolated(pg_data_t *pgdat)
+{
+ wait_queue_head_t *wqh;
+
+ wqh = &pgdat->reclaim_wait[VMSCAN_THROTTLE_ISOLATED];
+ if (waitqueue_active(wqh))
+ wake_up(wqh);
+}
+
+vm_fault_t do_swap_page(struct vm_fault *vmf);
+void folio_rotate_reclaimable(struct folio *folio);
+bool __folio_end_writeback(struct folio *folio);
+void deactivate_file_folio(struct folio *folio);
+void folio_activate(struct folio *folio);
+
+void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas,
+ struct vm_area_struct *start_vma, unsigned long floor,
+ unsigned long ceiling, bool mm_wr_locked);
+void pmd_install(struct mm_struct *mm, pmd_t *pmd, pgtable_t *pte);
+
+struct zap_details;
+void unmap_page_range(struct mmu_gather *tlb,
+ struct vm_area_struct *vma,
+ unsigned long addr, unsigned long end,
+ struct zap_details *details);
+
+void page_cache_ra_order(struct readahead_control *, struct file_ra_state *,
+ unsigned int order);
+void force_page_cache_ra(struct readahead_control *, unsigned long nr);
+static inline void force_page_cache_readahead(struct address_space *mapping,
+ struct file *file, pgoff_t index, unsigned long nr_to_read)
+{
+ DEFINE_READAHEAD(ractl, file, &file->f_ra, mapping, index);
+ force_page_cache_ra(&ractl, nr_to_read);
+}
+
+unsigned find_lock_entries(struct address_space *mapping, pgoff_t *start,
+ pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices);
+unsigned find_get_entries(struct address_space *mapping, pgoff_t *start,
+ pgoff_t end, struct folio_batch *fbatch, pgoff_t *indices);
+void filemap_free_folio(struct address_space *mapping, struct folio *folio);
+int truncate_inode_folio(struct address_space *mapping, struct folio *folio);
+bool truncate_inode_partial_folio(struct folio *folio, loff_t start,
+ loff_t end);
+long invalidate_inode_page(struct page *page);
+unsigned long mapping_try_invalidate(struct address_space *mapping,
+ pgoff_t start, pgoff_t end, unsigned long *nr_failed);
+
+/**
+ * folio_evictable - Test whether a folio is evictable.
+ * @folio: The folio to test.
+ *
+ * Test whether @folio is evictable -- i.e., should be placed on
+ * active/inactive lists vs unevictable list.
+ *
+ * Reasons folio might not be evictable:
+ * 1. folio's mapping marked unevictable
+ * 2. One of the pages in the folio is part of an mlocked VMA
+ */
+static inline bool folio_evictable(struct folio *folio)
+{
+ bool ret;
+
+ /* Prevent address_space of inode and swap cache from being freed */
+ rcu_read_lock();
+ ret = !mapping_unevictable(folio_mapping(folio)) &&
+ !folio_test_mlocked(folio);
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Turn a non-refcounted page (->_refcount == 0) into refcounted with
+ * a count of one.
+ */
+static inline void set_page_refcounted(struct page *page)
+{
+ VM_BUG_ON_PAGE(PageTail(page), page);
+ VM_BUG_ON_PAGE(page_ref_count(page), page);
+ set_page_count(page, 1);
+}
+
+/*
+ * Return true if a folio needs ->release_folio() calling upon it.
+ */
+static inline bool folio_needs_release(struct folio *folio)
+{
+ struct address_space *mapping = folio_mapping(folio);
+
+ return folio_has_private(folio) ||
+ (mapping && mapping_release_always(mapping));
+}
+
+extern unsigned long highest_memmap_pfn;
+
+/*
+ * Maximum number of reclaim retries without progress before the OOM
+ * killer is consider the only way forward.
+ */
+#define MAX_RECLAIM_RETRIES 16
+
+/*
+ * in mm/vmscan.c:
+ */
+bool isolate_lru_page(struct page *page);
+bool folio_isolate_lru(struct folio *folio);
+void putback_lru_page(struct page *page);
+void folio_putback_lru(struct folio *folio);
+extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason);
+
+/*
+ * in mm/rmap.c:
+ */
+pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
+
+/*
+ * in mm/page_alloc.c
+ */
+#define K(x) ((x) << (PAGE_SHIFT-10))
+
+extern char * const zone_names[MAX_NR_ZONES];
+
+/* perform sanity checks on struct pages being allocated or freed */
+DECLARE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled);
+
+extern int min_free_kbytes;
+
+void setup_per_zone_wmarks(void);
+void calculate_min_free_kbytes(void);
+int __meminit init_per_zone_wmark_min(void);
+void page_alloc_sysctl_init(void);
+
+/*
+ * Structure for holding the mostly immutable allocation parameters passed
+ * between functions involved in allocations, including the alloc_pages*
+ * family of functions.
+ *
+ * nodemask, migratetype and highest_zoneidx are initialized only once in
+ * __alloc_pages() and then never change.
+ *
+ * zonelist, preferred_zone and highest_zoneidx are set first in
+ * __alloc_pages() for the fast path, and might be later changed
+ * in __alloc_pages_slowpath(). All other functions pass the whole structure
+ * by a const pointer.
+ */
+struct alloc_context {
+ struct zonelist *zonelist;
+ nodemask_t *nodemask;
+ struct zoneref *preferred_zoneref;
+ int migratetype;
+
+ /*
+ * highest_zoneidx represents highest usable zone index of
+ * the allocation request. Due to the nature of the zone,
+ * memory on lower zone than the highest_zoneidx will be
+ * protected by lowmem_reserve[highest_zoneidx].
+ *
+ * highest_zoneidx is also used by reclaim/compaction to limit
+ * the target zone since higher zone than this index cannot be
+ * usable for this allocation request.
+ */
+ enum zone_type highest_zoneidx;
+ bool spread_dirty_pages;
+};
+
+/*
+ * This function returns the order of a free page in the buddy system. In
+ * general, page_zone(page)->lock must be held by the caller to prevent the
+ * page from being allocated in parallel and returning garbage as the order.
+ * If a caller does not hold page_zone(page)->lock, it must guarantee that the
+ * page cannot be allocated or merged in parallel. Alternatively, it must
+ * handle invalid values gracefully, and use buddy_order_unsafe() below.
+ */
+static inline unsigned int buddy_order(struct page *page)
+{
+ /* PageBuddy() must be checked by the caller */
+ return page_private(page);
+}
+
+/*
+ * Like buddy_order(), but for callers who cannot afford to hold the zone lock.
+ * PageBuddy() should be checked first by the caller to minimize race window,
+ * and invalid values must be handled gracefully.
+ *
+ * READ_ONCE is used so that if the caller assigns the result into a local
+ * variable and e.g. tests it for valid range before using, the compiler cannot
+ * decide to remove the variable and inline the page_private(page) multiple
+ * times, potentially observing different values in the tests and the actual
+ * use of the result.
+ */
+#define buddy_order_unsafe(page) READ_ONCE(page_private(page))
+
+/*
+ * This function checks whether a page is free && is the buddy
+ * we can coalesce a page and its buddy if
+ * (a) the buddy is not in a hole (check before calling!) &&
+ * (b) the buddy is in the buddy system &&
+ * (c) a page and its buddy have the same order &&
+ * (d) a page and its buddy are in the same zone.
+ *
+ * For recording whether a page is in the buddy system, we set PageBuddy.
+ * Setting, clearing, and testing PageBuddy is serialized by zone->lock.
+ *
+ * For recording page's order, we use page_private(page).
+ */
+static inline bool page_is_buddy(struct page *page, struct page *buddy,
+ unsigned int order)
+{
+ if (!page_is_guard(buddy) && !PageBuddy(buddy))
+ return false;
+
+ if (buddy_order(buddy) != order)
+ return false;
+
+ /*
+ * zone check is done late to avoid uselessly calculating
+ * zone/node ids for pages that could never merge.
+ */
+ if (page_zone_id(page) != page_zone_id(buddy))
+ return false;
+
+ VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
+
+ return true;
+}
+
+/*
+ * Locate the struct page for both the matching buddy in our
+ * pair (buddy1) and the combined O(n+1) page they form (page).
+ *
+ * 1) Any buddy B1 will have an order O twin B2 which satisfies
+ * the following equation:
+ * B2 = B1 ^ (1 << O)
+ * For example, if the starting buddy (buddy2) is #8 its order
+ * 1 buddy is #10:
+ * B2 = 8 ^ (1 << 1) = 8 ^ 2 = 10
+ *
+ * 2) Any buddy B will have an order O+1 parent P which
+ * satisfies the following equation:
+ * P = B & ~(1 << O)
+ *
+ * Assumption: *_mem_map is contiguous at least up to MAX_ORDER
+ */
+static inline unsigned long
+__find_buddy_pfn(unsigned long page_pfn, unsigned int order)
+{
+ return page_pfn ^ (1 << order);
+}
+
+/*
+ * Find the buddy of @page and validate it.
+ * @page: The input page
+ * @pfn: The pfn of the page, it saves a call to page_to_pfn() when the
+ * function is used in the performance-critical __free_one_page().
+ * @order: The order of the page
+ * @buddy_pfn: The output pointer to the buddy pfn, it also saves a call to
+ * page_to_pfn().
+ *
+ * The found buddy can be a non PageBuddy, out of @page's zone, or its order is
+ * not the same as @page. The validation is necessary before use it.
+ *
+ * Return: the found buddy page or NULL if not found.
+ */
+static inline struct page *find_buddy_page_pfn(struct page *page,
+ unsigned long pfn, unsigned int order, unsigned long *buddy_pfn)
+{
+ unsigned long __buddy_pfn = __find_buddy_pfn(pfn, order);
+ struct page *buddy;
+
+ buddy = page + (__buddy_pfn - pfn);
+ if (buddy_pfn)
+ *buddy_pfn = __buddy_pfn;
+
+ if (page_is_buddy(page, buddy, order))
+ return buddy;
+ return NULL;
+}
+
+extern struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
+ unsigned long end_pfn, struct zone *zone);
+
+static inline struct page *pageblock_pfn_to_page(unsigned long start_pfn,
+ unsigned long end_pfn, struct zone *zone)
+{
+ if (zone->contiguous)
+ return pfn_to_page(start_pfn);
+
+ return __pageblock_pfn_to_page(start_pfn, end_pfn, zone);
+}
+
+void set_zone_contiguous(struct zone *zone);
+
+static inline void clear_zone_contiguous(struct zone *zone)
+{
+ zone->contiguous = false;
+}
+
+extern int __isolate_free_page(struct page *page, unsigned int order);
+extern void __putback_isolated_page(struct page *page, unsigned int order,
+ int mt);
+extern void memblock_free_pages(struct page *page, unsigned long pfn,
+ unsigned int order);
+extern void __free_pages_core(struct page *page, unsigned int order);
+
+/*
+ * This will have no effect, other than possibly generating a warning, if the
+ * caller passes in a non-large folio.
+ */
+static inline void folio_set_order(struct folio *folio, unsigned int order)
+{
+ if (WARN_ON_ONCE(!order || !folio_test_large(folio)))
+ return;
+
+ folio->_flags_1 = (folio->_flags_1 & ~0xffUL) | order;
+#ifdef CONFIG_64BIT
+ folio->_folio_nr_pages = 1U << order;
+#endif
+}
+
+void folio_undo_large_rmappable(struct folio *folio);
+
+static inline void prep_compound_head(struct page *page, unsigned int order)
+{
+ struct folio *folio = (struct folio *)page;
+
+ folio_set_order(folio, order);
+ atomic_set(&folio->_entire_mapcount, -1);
+ atomic_set(&folio->_nr_pages_mapped, 0);
+ atomic_set(&folio->_pincount, 0);
+}
+
+static inline void prep_compound_tail(struct page *head, int tail_idx)
+{
+ struct page *p = head + tail_idx;
+
+ p->mapping = TAIL_MAPPING;
+ set_compound_head(p, head);
+ set_page_private(p, 0);
+}
+
+extern void prep_compound_page(struct page *page, unsigned int order);
+
+extern void post_alloc_hook(struct page *page, unsigned int order,
+ gfp_t gfp_flags);
+extern int user_min_free_kbytes;
+
+extern void free_unref_page(struct page *page, unsigned int order);
+extern void free_unref_page_list(struct list_head *list);
+
+extern void zone_pcp_reset(struct zone *zone);
+extern void zone_pcp_disable(struct zone *zone);
+extern void zone_pcp_enable(struct zone *zone);
+extern void zone_pcp_init(struct zone *zone);
+
+extern void *memmap_alloc(phys_addr_t size, phys_addr_t align,
+ phys_addr_t min_addr,
+ int nid, bool exact_nid);
+
+void memmap_init_range(unsigned long, int, unsigned long, unsigned long,
+ unsigned long, enum meminit_context, struct vmem_altmap *, int);
+
+
+int split_free_page(struct page *free_page,
+ unsigned int order, unsigned long split_pfn_offset);
+
+#if defined CONFIG_COMPACTION || defined CONFIG_CMA
+
+/*
+ * in mm/compaction.c
+ */
+/*
+ * compact_control is used to track pages being migrated and the free pages
+ * they are being migrated to during memory compaction. The free_pfn starts
+ * at the end of a zone and migrate_pfn begins at the start. Movable pages
+ * are moved to the end of a zone during a compaction run and the run
+ * completes when free_pfn <= migrate_pfn
+ */
+struct compact_control {
+ struct list_head freepages; /* List of free pages to migrate to */
+ struct list_head migratepages; /* List of pages being migrated */
+ unsigned int nr_freepages; /* Number of isolated free pages */
+ unsigned int nr_migratepages; /* Number of pages to migrate */
+ unsigned long free_pfn; /* isolate_freepages search base */
+ /*
+ * Acts as an in/out parameter to page isolation for migration.
+ * isolate_migratepages uses it as a search base.
+ * isolate_migratepages_block will update the value to the next pfn
+ * after the last isolated one.
+ */
+ unsigned long migrate_pfn;
+ unsigned long fast_start_pfn; /* a pfn to start linear scan from */
+ struct zone *zone;
+ unsigned long total_migrate_scanned;
+ unsigned long total_free_scanned;
+ unsigned short fast_search_fail;/* failures to use free list searches */
+ short search_order; /* order to start a fast search at */
+ const gfp_t gfp_mask; /* gfp mask of a direct compactor */
+ int order; /* order a direct compactor needs */
+ int migratetype; /* migratetype of direct compactor */
+ const unsigned int alloc_flags; /* alloc flags of a direct compactor */
+ const int highest_zoneidx; /* zone index of a direct compactor */
+ enum migrate_mode mode; /* Async or sync migration mode */
+ bool ignore_skip_hint; /* Scan blocks even if marked skip */
+ bool no_set_skip_hint; /* Don't mark blocks for skipping */
+ bool ignore_block_suitable; /* Scan blocks considered unsuitable */
+ bool direct_compaction; /* False from kcompactd or /proc/... */
+ bool proactive_compaction; /* kcompactd proactive compaction */
+ bool whole_zone; /* Whole zone should/has been scanned */
+ bool contended; /* Signal lock contention */
+ bool finish_pageblock; /* Scan the remainder of a pageblock. Used
+ * when there are potentially transient
+ * isolation or migration failures to
+ * ensure forward progress.
+ */
+ bool alloc_contig; /* alloc_contig_range allocation */
+};
+
+/*
+ * Used in direct compaction when a page should be taken from the freelists
+ * immediately when one is created during the free path.
+ */
+struct capture_control {
+ struct compact_control *cc;
+ struct page *page;
+};
+
+unsigned long
+isolate_freepages_range(struct compact_control *cc,
+ unsigned long start_pfn, unsigned long end_pfn);
+int
+isolate_migratepages_range(struct compact_control *cc,
+ unsigned long low_pfn, unsigned long end_pfn);
+
+int __alloc_contig_migrate_range(struct compact_control *cc,
+ unsigned long start, unsigned long end);
+
+/* Free whole pageblock and set its migration type to MIGRATE_CMA. */
+void init_cma_reserved_pageblock(struct page *page);
+
+#endif /* CONFIG_COMPACTION || CONFIG_CMA */
+
+int find_suitable_fallback(struct free_area *area, unsigned int order,
+ int migratetype, bool only_stealable, bool *can_steal);
+
+static inline bool free_area_empty(struct free_area *area, int migratetype)
+{
+ return list_empty(&area->free_list[migratetype]);
+}
+
+/*
+ * These three helpers classifies VMAs for virtual memory accounting.
+ */
+
+/*
+ * Executable code area - executable, not writable, not stack
+ */
+static inline bool is_exec_mapping(vm_flags_t flags)
+{
+ return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) == VM_EXEC;
+}
+
+/*
+ * Stack area (including shadow stacks)
+ *
+ * VM_GROWSUP / VM_GROWSDOWN VMAs are always private anonymous:
+ * do_mmap() forbids all other combinations.
+ */
+static inline bool is_stack_mapping(vm_flags_t flags)
+{
+ return ((flags & VM_STACK) == VM_STACK) || (flags & VM_SHADOW_STACK);
+}
+
+/*
+ * Data area - private, writable, not stack
+ */
+static inline bool is_data_mapping(vm_flags_t flags)
+{
+ return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) == VM_WRITE;
+}
+
+/* mm/util.c */
+struct anon_vma *folio_anon_vma(struct folio *folio);
+
+#ifdef CONFIG_MMU
+void unmap_mapping_folio(struct folio *folio);
+extern long populate_vma_page_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end, int *locked);
+extern long faultin_vma_page_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end,
+ bool write, int *locked);
+extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags,
+ unsigned long bytes);
+/*
+ * mlock_vma_folio() and munlock_vma_folio():
+ * should be called with vma's mmap_lock held for read or write,
+ * under page table lock for the pte/pmd being added or removed.
+ *
+ * mlock is usually called at the end of page_add_*_rmap(), munlock at
+ * the end of page_remove_rmap(); but new anon folios are managed by
+ * folio_add_lru_vma() calling mlock_new_folio().
+ *
+ * @compound is used to include pmd mappings of THPs, but filter out
+ * pte mappings of THPs, which cannot be consistently counted: a pte
+ * mapping of the THP head cannot be distinguished by the page alone.
+ */
+void mlock_folio(struct folio *folio);
+static inline void mlock_vma_folio(struct folio *folio,
+ struct vm_area_struct *vma, bool compound)
+{
+ /*
+ * The VM_SPECIAL check here serves two purposes.
+ * 1) VM_IO check prevents migration from double-counting during mlock.
+ * 2) Although mmap_region() and mlock_fixup() take care that VM_LOCKED
+ * is never left set on a VM_SPECIAL vma, there is an interval while
+ * file->f_op->mmap() is using vm_insert_page(s), when VM_LOCKED may
+ * still be set while VM_SPECIAL bits are added: so ignore it then.
+ */
+ if (unlikely((vma->vm_flags & (VM_LOCKED|VM_SPECIAL)) == VM_LOCKED) &&
+ (compound || !folio_test_large(folio)))
+ mlock_folio(folio);
+}
+
+void munlock_folio(struct folio *folio);
+static inline void munlock_vma_folio(struct folio *folio,
+ struct vm_area_struct *vma, bool compound)
+{
+ if (unlikely(vma->vm_flags & VM_LOCKED) &&
+ (compound || !folio_test_large(folio)))
+ munlock_folio(folio);
+}
+
+void mlock_new_folio(struct folio *folio);
+bool need_mlock_drain(int cpu);
+void mlock_drain_local(void);
+void mlock_drain_remote(int cpu);
+
+extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
+
+/*
+ * Return the start of user virtual address at the specific offset within
+ * a vma.
+ */
+static inline unsigned long
+vma_pgoff_address(pgoff_t pgoff, unsigned long nr_pages,
+ struct vm_area_struct *vma)
+{
+ unsigned long address;
+
+ if (pgoff >= vma->vm_pgoff) {
+ address = vma->vm_start +
+ ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
+ /* Check for address beyond vma (or wrapped through 0?) */
+ if (address < vma->vm_start || address >= vma->vm_end)
+ address = -EFAULT;
+ } else if (pgoff + nr_pages - 1 >= vma->vm_pgoff) {
+ /* Test above avoids possibility of wrap to 0 on 32-bit */
+ address = vma->vm_start;
+ } else {
+ address = -EFAULT;
+ }
+ return address;
+}
+
+/*
+ * Return the start of user virtual address of a page within a vma.
+ * Returns -EFAULT if all of the page is outside the range of vma.
+ * If page is a compound head, the entire compound page is considered.
+ */
+static inline unsigned long
+vma_address(struct page *page, struct vm_area_struct *vma)
+{
+ VM_BUG_ON_PAGE(PageKsm(page), page); /* KSM page->index unusable */
+ return vma_pgoff_address(page_to_pgoff(page), compound_nr(page), vma);
+}
+
+/*
+ * Then at what user virtual address will none of the range be found in vma?
+ * Assumes that vma_address() already returned a good starting address.
+ */
+static inline unsigned long vma_address_end(struct page_vma_mapped_walk *pvmw)
+{
+ struct vm_area_struct *vma = pvmw->vma;
+ pgoff_t pgoff;
+ unsigned long address;
+
+ /* Common case, plus ->pgoff is invalid for KSM */
+ if (pvmw->nr_pages == 1)
+ return pvmw->address + PAGE_SIZE;
+
+ pgoff = pvmw->pgoff + pvmw->nr_pages;
+ address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
+ /* Check for address beyond vma (or wrapped through 0?) */
+ if (address < vma->vm_start || address > vma->vm_end)
+ address = vma->vm_end;
+ return address;
+}
+
+static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
+ struct file *fpin)
+{
+ int flags = vmf->flags;
+
+ if (fpin)
+ return fpin;
+
+ /*
+ * FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or
+ * anything, so we only pin the file and drop the mmap_lock if only
+ * FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt.
+ */
+ if (fault_flag_allow_retry_first(flags) &&
+ !(flags & FAULT_FLAG_RETRY_NOWAIT)) {
+ fpin = get_file(vmf->vma->vm_file);
+ release_fault_lock(vmf);
+ }
+ return fpin;
+}
+#else /* !CONFIG_MMU */
+static inline void unmap_mapping_folio(struct folio *folio) { }
+static inline void mlock_new_folio(struct folio *folio) { }
+static inline bool need_mlock_drain(int cpu) { return false; }
+static inline void mlock_drain_local(void) { }
+static inline void mlock_drain_remote(int cpu) { }
+static inline void vunmap_range_noflush(unsigned long start, unsigned long end)
+{
+}
+#endif /* !CONFIG_MMU */
+
+/* Memory initialisation debug and verification */
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+DECLARE_STATIC_KEY_TRUE(deferred_pages);
+
+bool __init deferred_grow_zone(struct zone *zone, unsigned int order);
+#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
+
+enum mminit_level {
+ MMINIT_WARNING,
+ MMINIT_VERIFY,
+ MMINIT_TRACE
+};
+
+#ifdef CONFIG_DEBUG_MEMORY_INIT
+
+extern int mminit_loglevel;
+
+#define mminit_dprintk(level, prefix, fmt, arg...) \
+do { \
+ if (level < mminit_loglevel) { \
+ if (level <= MMINIT_WARNING) \
+ pr_warn("mminit::" prefix " " fmt, ##arg); \
+ else \
+ printk(KERN_DEBUG "mminit::" prefix " " fmt, ##arg); \
+ } \
+} while (0)
+
+extern void mminit_verify_pageflags_layout(void);
+extern void mminit_verify_zonelist(void);
+#else
+
+static inline void mminit_dprintk(enum mminit_level level,
+ const char *prefix, const char *fmt, ...)
+{
+}
+
+static inline void mminit_verify_pageflags_layout(void)
+{
+}
+
+static inline void mminit_verify_zonelist(void)
+{
+}
+#endif /* CONFIG_DEBUG_MEMORY_INIT */
+
+#define NODE_RECLAIM_NOSCAN -2
+#define NODE_RECLAIM_FULL -1
+#define NODE_RECLAIM_SOME 0
+#define NODE_RECLAIM_SUCCESS 1
+
+#ifdef CONFIG_NUMA
+extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
+extern int find_next_best_node(int node, nodemask_t *used_node_mask);
+#else
+static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask,
+ unsigned int order)
+{
+ return NODE_RECLAIM_NOSCAN;
+}
+static inline int find_next_best_node(int node, nodemask_t *used_node_mask)
+{
+ return NUMA_NO_NODE;
+}
+#endif
+
+/*
+ * mm/memory-failure.c
+ */
+extern int hwpoison_filter(struct page *p);
+
+extern u32 hwpoison_filter_dev_major;
+extern u32 hwpoison_filter_dev_minor;
+extern u64 hwpoison_filter_flags_mask;
+extern u64 hwpoison_filter_flags_value;
+extern u64 hwpoison_filter_memcg;
+extern u32 hwpoison_filter_enable;
+
+extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long,
+ unsigned long, unsigned long,
+ unsigned long, unsigned long);
+
+extern void set_pageblock_order(void);
+unsigned long reclaim_pages(struct list_head *folio_list);
+unsigned int reclaim_clean_pages_from_list(struct zone *zone,
+ struct list_head *folio_list);
+/* The ALLOC_WMARK bits are used as an index to zone->watermark */
+#define ALLOC_WMARK_MIN WMARK_MIN
+#define ALLOC_WMARK_LOW WMARK_LOW
+#define ALLOC_WMARK_HIGH WMARK_HIGH
+#define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
+
+/* Mask to get the watermark bits */
+#define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
+
+/*
+ * Only MMU archs have async oom victim reclaim - aka oom_reaper so we
+ * cannot assume a reduced access to memory reserves is sufficient for
+ * !MMU
+ */
+#ifdef CONFIG_MMU
+#define ALLOC_OOM 0x08
+#else
+#define ALLOC_OOM ALLOC_NO_WATERMARKS
+#endif
+
+#define ALLOC_NON_BLOCK 0x10 /* Caller cannot block. Allow access
+ * to 25% of the min watermark or
+ * 62.5% if __GFP_HIGH is set.
+ */
+#define ALLOC_MIN_RESERVE 0x20 /* __GFP_HIGH set. Allow access to 50%
+ * of the min watermark.
+ */
+#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
+#define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
+#ifdef CONFIG_ZONE_DMA32
+#define ALLOC_NOFRAGMENT 0x100 /* avoid mixing pageblock types */
+#else
+#define ALLOC_NOFRAGMENT 0x0
+#endif
+#define ALLOC_HIGHATOMIC 0x200 /* Allows access to MIGRATE_HIGHATOMIC */
+#define ALLOC_KSWAPD 0x800 /* allow waking of kswapd, __GFP_KSWAPD_RECLAIM set */
+
+/* Flags that allow allocations below the min watermark. */
+#define ALLOC_RESERVES (ALLOC_NON_BLOCK|ALLOC_MIN_RESERVE|ALLOC_HIGHATOMIC|ALLOC_OOM)
+
+enum ttu_flags;
+struct tlbflush_unmap_batch;
+
+
+/*
+ * only for MM internal work items which do not depend on
+ * any allocations or locks which might depend on allocations
+ */
+extern struct workqueue_struct *mm_percpu_wq;
+
+#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
+void try_to_unmap_flush(void);
+void try_to_unmap_flush_dirty(void);
+void flush_tlb_batched_pending(struct mm_struct *mm);
+#else
+static inline void try_to_unmap_flush(void)
+{
+}
+static inline void try_to_unmap_flush_dirty(void)
+{
+}
+static inline void flush_tlb_batched_pending(struct mm_struct *mm)
+{
+}
+#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
+
+extern const struct trace_print_flags pageflag_names[];
+extern const struct trace_print_flags pagetype_names[];
+extern const struct trace_print_flags vmaflag_names[];
+extern const struct trace_print_flags gfpflag_names[];
+
+static inline bool is_migrate_highatomic(enum migratetype migratetype)
+{
+ return migratetype == MIGRATE_HIGHATOMIC;
+}
+
+static inline bool is_migrate_highatomic_page(struct page *page)
+{
+ return get_pageblock_migratetype(page) == MIGRATE_HIGHATOMIC;
+}
+
+void setup_zone_pageset(struct zone *zone);
+
+struct migration_target_control {
+ int nid; /* preferred node id */
+ nodemask_t *nmask;
+ gfp_t gfp_mask;
+};
+
+/*
+ * mm/filemap.c
+ */
+size_t splice_folio_into_pipe(struct pipe_inode_info *pipe,
+ struct folio *folio, loff_t fpos, size_t size);
+
+/*
+ * mm/vmalloc.c
+ */
+#ifdef CONFIG_MMU
+void __init vmalloc_init(void);
+int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end,
+ pgprot_t prot, struct page **pages, unsigned int page_shift);
+#else
+static inline void vmalloc_init(void)
+{
+}
+
+static inline
+int __must_check vmap_pages_range_noflush(unsigned long addr, unsigned long end,
+ pgprot_t prot, struct page **pages, unsigned int page_shift)
+{
+ return -EINVAL;
+}
+#endif
+
+int __must_check __vmap_pages_range_noflush(unsigned long addr,
+ unsigned long end, pgprot_t prot,
+ struct page **pages, unsigned int page_shift);
+
+void vunmap_range_noflush(unsigned long start, unsigned long end);
+
+void __vunmap_range_noflush(unsigned long start, unsigned long end);
+
+int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
+ unsigned long addr, int page_nid, int *flags);
+
+void free_zone_device_page(struct page *page);
+int migrate_device_coherent_page(struct page *page);
+
+/*
+ * mm/gup.c
+ */
+struct folio *try_grab_folio(struct page *page, int refs, unsigned int flags);
+int __must_check try_grab_page(struct page *page, unsigned int flags);
+
+/*
+ * mm/huge_memory.c
+ */
+struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
+ unsigned long addr, pmd_t *pmd,
+ unsigned int flags);
+
+enum {
+ /* mark page accessed */
+ FOLL_TOUCH = 1 << 16,
+ /* a retry, previous pass started an IO */
+ FOLL_TRIED = 1 << 17,
+ /* we are working on non-current tsk/mm */
+ FOLL_REMOTE = 1 << 18,
+ /* pages must be released via unpin_user_page */
+ FOLL_PIN = 1 << 19,
+ /* gup_fast: prevent fall-back to slow gup */
+ FOLL_FAST_ONLY = 1 << 20,
+ /* allow unlocking the mmap lock */
+ FOLL_UNLOCKABLE = 1 << 21,
+};
+
+/*
+ * Indicates for which pages that are write-protected in the page table,
+ * whether GUP has to trigger unsharing via FAULT_FLAG_UNSHARE such that the
+ * GUP pin will remain consistent with the pages mapped into the page tables
+ * of the MM.
+ *
+ * Temporary unmapping of PageAnonExclusive() pages or clearing of
+ * PageAnonExclusive() has to protect against concurrent GUP:
+ * * Ordinary GUP: Using the PT lock
+ * * GUP-fast and fork(): mm->write_protect_seq
+ * * GUP-fast and KSM or temporary unmapping (swap, migration): see
+ * page_try_share_anon_rmap()
+ *
+ * Must be called with the (sub)page that's actually referenced via the
+ * page table entry, which might not necessarily be the head page for a
+ * PTE-mapped THP.
+ *
+ * If the vma is NULL, we're coming from the GUP-fast path and might have
+ * to fallback to the slow path just to lookup the vma.
+ */
+static inline bool gup_must_unshare(struct vm_area_struct *vma,
+ unsigned int flags, struct page *page)
+{
+ /*
+ * FOLL_WRITE is implicitly handled correctly as the page table entry
+ * has to be writable -- and if it references (part of) an anonymous
+ * folio, that part is required to be marked exclusive.
+ */
+ if ((flags & (FOLL_WRITE | FOLL_PIN)) != FOLL_PIN)
+ return false;
+ /*
+ * Note: PageAnon(page) is stable until the page is actually getting
+ * freed.
+ */
+ if (!PageAnon(page)) {
+ /*
+ * We only care about R/O long-term pining: R/O short-term
+ * pinning does not have the semantics to observe successive
+ * changes through the process page tables.
+ */
+ if (!(flags & FOLL_LONGTERM))
+ return false;
+
+ /* We really need the vma ... */
+ if (!vma)
+ return true;
+
+ /*
+ * ... because we only care about writable private ("COW")
+ * mappings where we have to break COW early.
+ */
+ return is_cow_mapping(vma->vm_flags);
+ }
+
+ /* Paired with a memory barrier in page_try_share_anon_rmap(). */
+ if (IS_ENABLED(CONFIG_HAVE_FAST_GUP))
+ smp_rmb();
+
+ /*
+ * During GUP-fast we might not get called on the head page for a
+ * hugetlb page that is mapped using cont-PTE, because GUP-fast does
+ * not work with the abstracted hugetlb PTEs that always point at the
+ * head page. For hugetlb, PageAnonExclusive only applies on the head
+ * page (as it cannot be partially COW-shared), so lookup the head page.
+ */
+ if (unlikely(!PageHead(page) && PageHuge(page)))
+ page = compound_head(page);
+
+ /*
+ * Note that PageKsm() pages cannot be exclusive, and consequently,
+ * cannot get pinned.
+ */
+ return !PageAnonExclusive(page);
+}
+
+extern bool mirrored_kernelcore;
+extern bool memblock_has_mirror(void);
+
+static inline bool vma_soft_dirty_enabled(struct vm_area_struct *vma)
+{
+ /*
+ * NOTE: we must check this before VM_SOFTDIRTY on soft-dirty
+ * enablements, because when without soft-dirty being compiled in,
+ * VM_SOFTDIRTY is defined as 0x0, then !(vm_flags & VM_SOFTDIRTY)
+ * will be constantly true.
+ */
+ if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
+ return false;
+
+ /*
+ * Soft-dirty is kind of special: its tracking is enabled when the
+ * vma flags not set.
+ */
+ return !(vma->vm_flags & VM_SOFTDIRTY);
+}
+
+static inline void vma_iter_config(struct vma_iterator *vmi,
+ unsigned long index, unsigned long last)
+{
+ MAS_BUG_ON(&vmi->mas, vmi->mas.node != MAS_START &&
+ (vmi->mas.index > index || vmi->mas.last < index));
+ __mas_set_range(&vmi->mas, index, last - 1);
+}
+
+/*
+ * VMA Iterator functions shared between nommu and mmap
+ */
+static inline int vma_iter_prealloc(struct vma_iterator *vmi,
+ struct vm_area_struct *vma)
+{
+ return mas_preallocate(&vmi->mas, vma, GFP_KERNEL);
+}
+
+static inline void vma_iter_clear(struct vma_iterator *vmi)
+{
+ mas_store_prealloc(&vmi->mas, NULL);
+}
+
+static inline int vma_iter_clear_gfp(struct vma_iterator *vmi,
+ unsigned long start, unsigned long end, gfp_t gfp)
+{
+ __mas_set_range(&vmi->mas, start, end - 1);
+ mas_store_gfp(&vmi->mas, NULL, gfp);
+ if (unlikely(mas_is_err(&vmi->mas)))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static inline struct vm_area_struct *vma_iter_load(struct vma_iterator *vmi)
+{
+ return mas_walk(&vmi->mas);
+}
+
+/* Store a VMA with preallocated memory */
+static inline void vma_iter_store(struct vma_iterator *vmi,
+ struct vm_area_struct *vma)
+{
+
+#if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
+ if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START &&
+ vmi->mas.index > vma->vm_start)) {
+ pr_warn("%lx > %lx\n store vma %lx-%lx\n into slot %lx-%lx\n",
+ vmi->mas.index, vma->vm_start, vma->vm_start,
+ vma->vm_end, vmi->mas.index, vmi->mas.last);
+ }
+ if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START &&
+ vmi->mas.last < vma->vm_start)) {
+ pr_warn("%lx < %lx\nstore vma %lx-%lx\ninto slot %lx-%lx\n",
+ vmi->mas.last, vma->vm_start, vma->vm_start, vma->vm_end,
+ vmi->mas.index, vmi->mas.last);
+ }
+#endif
+
+ if (vmi->mas.node != MAS_START &&
+ ((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start)))
+ vma_iter_invalidate(vmi);
+
+ __mas_set_range(&vmi->mas, vma->vm_start, vma->vm_end - 1);
+ mas_store_prealloc(&vmi->mas, vma);
+}
+
+static inline int vma_iter_store_gfp(struct vma_iterator *vmi,
+ struct vm_area_struct *vma, gfp_t gfp)
+{
+ if (vmi->mas.node != MAS_START &&
+ ((vmi->mas.index > vma->vm_start) || (vmi->mas.last < vma->vm_start)))
+ vma_iter_invalidate(vmi);
+
+ __mas_set_range(&vmi->mas, vma->vm_start, vma->vm_end - 1);
+ mas_store_gfp(&vmi->mas, vma, gfp);
+ if (unlikely(mas_is_err(&vmi->mas)))
+ return -ENOMEM;
+
+ return 0;
+}
+
+/*
+ * VMA lock generalization
+ */
+struct vma_prepare {
+ struct vm_area_struct *vma;
+ struct vm_area_struct *adj_next;
+ struct file *file;
+ struct address_space *mapping;
+ struct anon_vma *anon_vma;
+ struct vm_area_struct *insert;
+ struct vm_area_struct *remove;
+ struct vm_area_struct *remove2;
+};
+#endif /* __MM_INTERNAL_H */