/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_HUGE_MM_H
#define _LINUX_HUGE_MM_H

#include <linux/mm_types.h>

#include <linux/fs.h> /* only for vma_is_dax() */
#include <linux/kobject.h>

vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                  pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
                  struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma);
bool huge_pmd_set_accessed(struct vm_fault *vmf);
int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                  pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
                  struct vm_area_struct *vma);

#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
#else
static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
{
}
#endif

vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf);
bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
                           pmd_t *pmd, unsigned long addr, unsigned long next);
int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd,
                 unsigned long addr);
int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud,
                 unsigned long addr);
bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
                   unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd);
int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
                    pmd_t *pmd, unsigned long addr, pgprot_t newprot,
                    unsigned long cp_flags);

vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, unsigned long pfn,
                              bool write);
vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, unsigned long pfn,
                              bool write);
vm_fault_t vmf_insert_folio_pmd(struct vm_fault *vmf, struct folio *folio,
                                bool write);
vm_fault_t vmf_insert_folio_pud(struct vm_fault *vmf, struct folio *folio,
                                bool write);

enum transparent_hugepage_flag {
        TRANSPARENT_HUGEPAGE_UNSUPPORTED,
        TRANSPARENT_HUGEPAGE_FLAG,
        TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
        TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
        TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
        TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
        TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
        TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
        TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
};

struct kobject;
struct kobj_attribute;

ssize_t single_hugepage_flag_store(struct kobject *kobj,
                                   struct kobj_attribute *attr,
                                   const char *buf, size_t count,
                                   enum transparent_hugepage_flag flag);
ssize_t single_hugepage_flag_show(struct kobject *kobj,
                                  struct kobj_attribute *attr, char *buf,
                                  enum transparent_hugepage_flag flag);
extern struct kobj_attribute shmem_enabled_attr;
extern struct kobj_attribute thpsize_shmem_enabled_attr;

/*
 * Mask of all large folio orders supported for anonymous THP; all orders up to
 * and including PMD_ORDER, except order-0 (which is not "huge") and order-1
 * (which is a limitation of the THP implementation).
 */
#define THP_ORDERS_ALL_ANON     ((BIT(PMD_ORDER + 1) - 1) & ~(BIT(0) | BIT(1)))

/*
 * Mask of all large folio orders supported for file THP. Folios in a DAX
 * file is never split and the MAX_PAGECACHE_ORDER limit does not apply to
 * it.  Same to PFNMAPs where there's neither page* nor pagecache.
 */
#define THP_ORDERS_ALL_SPECIAL          \
        (BIT(PMD_ORDER) | BIT(PUD_ORDER))
#define THP_ORDERS_ALL_FILE_DEFAULT     \
        ((BIT(MAX_PAGECACHE_ORDER + 1) - 1) & ~BIT(0))

/*
 * Mask of all large folio orders supported for THP.
 */
#define THP_ORDERS_ALL  \
        (THP_ORDERS_ALL_ANON | THP_ORDERS_ALL_SPECIAL | THP_ORDERS_ALL_FILE_DEFAULT)

enum tva_type {
        TVA_SMAPS,              /* Exposing "THPeligible:" in smaps. */
        TVA_PAGEFAULT,          /* Serving a page fault. */
        TVA_KHUGEPAGED,         /* Khugepaged collapse. */
        TVA_FORCED_COLLAPSE,    /* Forced collapse (e.g. MADV_COLLAPSE). */
};

#define thp_vma_allowable_order(vma, vm_flags, type, order) \
        (!!thp_vma_allowable_orders(vma, vm_flags, type, BIT(order)))

#define split_folio(f) split_folio_to_list(f, NULL)

#ifdef CONFIG_PGTABLE_HAS_HUGE_LEAVES
#define HPAGE_PMD_SHIFT PMD_SHIFT
#define HPAGE_PUD_SHIFT PUD_SHIFT
#else
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
#endif

#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
#define HPAGE_PMD_MASK  (~(HPAGE_PMD_SIZE - 1))
#define HPAGE_PMD_SIZE  ((1UL) << HPAGE_PMD_SHIFT)

#define HPAGE_PUD_ORDER (HPAGE_PUD_SHIFT-PAGE_SHIFT)
#define HPAGE_PUD_NR (1<<HPAGE_PUD_ORDER)
#define HPAGE_PUD_MASK  (~(HPAGE_PUD_SIZE - 1))
#define HPAGE_PUD_SIZE  ((1UL) << HPAGE_PUD_SHIFT)

enum mthp_stat_item {
        MTHP_STAT_ANON_FAULT_ALLOC,
        MTHP_STAT_ANON_FAULT_FALLBACK,
        MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
        MTHP_STAT_ZSWPOUT,
        MTHP_STAT_SWPIN,
        MTHP_STAT_SWPIN_FALLBACK,
        MTHP_STAT_SWPIN_FALLBACK_CHARGE,
        MTHP_STAT_SWPOUT,
        MTHP_STAT_SWPOUT_FALLBACK,
        MTHP_STAT_SHMEM_ALLOC,
        MTHP_STAT_SHMEM_FALLBACK,
        MTHP_STAT_SHMEM_FALLBACK_CHARGE,
        MTHP_STAT_SPLIT,
        MTHP_STAT_SPLIT_FAILED,
        MTHP_STAT_SPLIT_DEFERRED,
        MTHP_STAT_NR_ANON,
        MTHP_STAT_NR_ANON_PARTIALLY_MAPPED,
        __MTHP_STAT_COUNT
};

#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && defined(CONFIG_SYSFS)
struct mthp_stat {
        unsigned long stats[ilog2(MAX_PTRS_PER_PTE) + 1][__MTHP_STAT_COUNT];
};

DECLARE_PER_CPU(struct mthp_stat, mthp_stats);

static inline void mod_mthp_stat(int order, enum mthp_stat_item item, int delta)
{
        if (order <= 0 || order > PMD_ORDER)
                return;

        this_cpu_add(mthp_stats.stats[order][item], delta);
}

static inline void count_mthp_stat(int order, enum mthp_stat_item item)
{
        mod_mthp_stat(order, item, 1);
}

#else
static inline void mod_mthp_stat(int order, enum mthp_stat_item item, int delta)
{
}

static inline void count_mthp_stat(int order, enum mthp_stat_item item)
{
}
#endif

#ifdef CONFIG_TRANSPARENT_HUGEPAGE

extern unsigned long transparent_hugepage_flags;
extern unsigned long huge_anon_orders_always;
extern unsigned long huge_anon_orders_madvise;
extern unsigned long huge_anon_orders_inherit;

static inline bool hugepage_global_enabled(void)
{
        return transparent_hugepage_flags &
                        ((1<<TRANSPARENT_HUGEPAGE_FLAG) |
                        (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG));
}

static inline bool hugepage_global_always(void)
{
        return transparent_hugepage_flags &
                        (1<<TRANSPARENT_HUGEPAGE_FLAG);
}

static inline int highest_order(unsigned long orders)
{
        return fls_long(orders) - 1;
}

static inline int next_order(unsigned long *orders, int prev)
{
        *orders &= ~BIT(prev);
        return highest_order(*orders);
}

/*
 * Do the below checks:
 *   - For file vma, check if the linear page offset of vma is
 *     order-aligned within the file.  The hugepage is
 *     guaranteed to be order-aligned within the file, but we must
 *     check that the order-aligned addresses in the VMA map to
 *     order-aligned offsets within the file, else the hugepage will
 *     not be mappable.
 *   - For all vmas, check if the haddr is in an aligned hugepage
 *     area.
 */
static inline bool thp_vma_suitable_order(struct vm_area_struct *vma,
                unsigned long addr, int order)
{
        unsigned long hpage_size = PAGE_SIZE << order;
        unsigned long haddr;

        /* Don't have to check pgoff for anonymous vma */
        if (!vma_is_anonymous(vma)) {
                if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
                                hpage_size >> PAGE_SHIFT))
                        return false;
        }

        haddr = ALIGN_DOWN(addr, hpage_size);

        if (haddr < vma->vm_start || haddr + hpage_size > vma->vm_end)
                return false;
        return true;
}

/*
 * Filter the bitfield of input orders to the ones suitable for use in the vma.
 * See thp_vma_suitable_order().
 * All orders that pass the checks are returned as a bitfield.
 */
static inline unsigned long thp_vma_suitable_orders(struct vm_area_struct *vma,
                unsigned long addr, unsigned long orders)
{
        int order;

        /*
         * Iterate over orders, highest to lowest, removing orders that don't
         * meet alignment requirements from the set. Exit loop at first order
         * that meets requirements, since all lower orders must also meet
         * requirements.
         */

        order = highest_order(orders);

        while (orders) {
                if (thp_vma_suitable_order(vma, addr, order))
                        break;
                order = next_order(&orders, order);
        }

        return orders;
}

unsigned long __thp_vma_allowable_orders(struct vm_area_struct *vma,
                                         vm_flags_t vm_flags,
                                         enum tva_type type,
                                         unsigned long orders);

/**
 * thp_vma_allowable_orders - determine hugepage orders that are allowed for vma
 * @vma:  the vm area to check
 * @vm_flags: use these vm_flags instead of vma->vm_flags
 * @type: TVA type
 * @orders: bitfield of all orders to consider
 *
 * Calculates the intersection of the requested hugepage orders and the allowed
 * hugepage orders for the provided vma. Permitted orders are encoded as a set
 * bit at the corresponding bit position (bit-2 corresponds to order-2, bit-3
 * corresponds to order-3, etc). Order-0 is never considered a hugepage order.
 *
 * Return: bitfield of orders allowed for hugepage in the vma. 0 if no hugepage
 * orders are allowed.
 */
static inline
unsigned long thp_vma_allowable_orders(struct vm_area_struct *vma,
                                       vm_flags_t vm_flags,
                                       enum tva_type type,
                                       unsigned long orders)
{
        /*
         * Optimization to check if required orders are enabled early. Only
         * forced collapse ignores sysfs configs.
         */
        if (type != TVA_FORCED_COLLAPSE && vma_is_anonymous(vma)) {
                unsigned long mask = READ_ONCE(huge_anon_orders_always);

                if (vm_flags & VM_HUGEPAGE)
                        mask |= READ_ONCE(huge_anon_orders_madvise);
                if (hugepage_global_always() ||
                    ((vm_flags & VM_HUGEPAGE) && hugepage_global_enabled()))
                        mask |= READ_ONCE(huge_anon_orders_inherit);

                orders &= mask;
                if (!orders)
                        return 0;
        }

        return __thp_vma_allowable_orders(vma, vm_flags, type, orders);
}

struct thpsize {
        struct kobject kobj;
        struct list_head node;
        int order;
};

#define to_thpsize(kobj) container_of(kobj, struct thpsize, kobj)

#define transparent_hugepage_use_zero_page()                            \
        (transparent_hugepage_flags &                                   \
         (1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))

/*
 * Check whether THPs are explicitly disabled for this VMA, for example,
 * through madvise or prctl.
 */
static inline bool vma_thp_disabled(struct vm_area_struct *vma,
                vm_flags_t vm_flags, bool forced_collapse)
{
        /* Are THPs disabled for this VMA? */
        if (vm_flags & VM_NOHUGEPAGE)
                return true;
        /* Are THPs disabled for all VMAs in the whole process? */
        if (mm_flags_test(MMF_DISABLE_THP_COMPLETELY, vma->vm_mm))
                return true;
        /*
         * Are THPs disabled only for VMAs where we didn't get an explicit
         * advise to use them?
         */
        if (vm_flags & VM_HUGEPAGE)
                return false;
        /*
         * Forcing a collapse (e.g., madv_collapse), is a clear advice to
         * use THPs.
         */
        if (forced_collapse)
                return false;
        return mm_flags_test(MMF_DISABLE_THP_EXCEPT_ADVISED, vma->vm_mm);
}

static inline bool thp_disabled_by_hw(void)
{
        /* If the hardware/firmware marked hugepage support disabled. */
        return transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_UNSUPPORTED);
}

unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
                unsigned long len, unsigned long pgoff, unsigned long flags);
unsigned long thp_get_unmapped_area_vmflags(struct file *filp, unsigned long addr,
                unsigned long len, unsigned long pgoff, unsigned long flags,
                vm_flags_t vm_flags);

enum split_type {
        SPLIT_TYPE_UNIFORM,
        SPLIT_TYPE_NON_UNIFORM,
};

int __split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
                unsigned int new_order);
int folio_split_unmapped(struct folio *folio, unsigned int new_order);
unsigned int min_order_for_split(struct folio *folio);
int split_folio_to_list(struct folio *folio, struct list_head *list);
int folio_check_splittable(struct folio *folio, unsigned int new_order,
                           enum split_type split_type);
int folio_split(struct folio *folio, unsigned int new_order, struct page *page,
                struct list_head *list);

static inline int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
                unsigned int new_order)
{
        return __split_huge_page_to_list_to_order(page, list, new_order);
}
static inline int split_huge_page_to_order(struct page *page, unsigned int new_order)
{
        return split_huge_page_to_list_to_order(page, NULL, new_order);
}

/**
 * try_folio_split_to_order() - try to split a @folio at @page to @new_order
 * using non uniform split.
 * @folio: folio to be split
 * @page: split to @new_order at the given page
 * @new_order: the target split order
 *
 * Try to split a @folio at @page using non uniform split to @new_order, if
 * non uniform split is not supported, fall back to uniform split. After-split
 * folios are put back to LRU list. Use min_order_for_split() to get the lower
 * bound of @new_order.
 *
 * Return: 0 - split is successful, otherwise split failed.
 */
static inline int try_folio_split_to_order(struct folio *folio,
                struct page *page, unsigned int new_order)
{
        if (folio_check_splittable(folio, new_order, SPLIT_TYPE_NON_UNIFORM))
                return split_huge_page_to_order(&folio->page, new_order);
        return folio_split(folio, new_order, page, NULL);
}
static inline int split_huge_page(struct page *page)
{
        return split_huge_page_to_list_to_order(page, NULL, 0);
}
void deferred_split_folio(struct folio *folio, bool partially_mapped);
#ifdef CONFIG_MEMCG
void reparent_deferred_split_queue(struct mem_cgroup *memcg);
#endif

void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
                unsigned long address, bool freeze);

/**
 * pmd_is_huge() - Is this PMD either a huge PMD entry or a software leaf entry?
 * @pmd: The PMD to check.
 *
 * A huge PMD entry is a non-empty entry which is present and marked huge or a
 * software leaf entry. This check be performed without the appropriate locks
 * held, in which case the condition should be rechecked after they are
 * acquired.
 *
 * Returns: true if this PMD is huge, false otherwise.
 */
static inline bool pmd_is_huge(pmd_t pmd)
{
        if (pmd_present(pmd)) {
                return pmd_trans_huge(pmd);
        } else if (!pmd_none(pmd)) {
                /*
                 * Non-present PMDs must be valid huge non-present entries. We
                 * cannot assert that here due to header dependency issues.
                 */
                return true;
        }

        return false;
}

#define split_huge_pmd(__vma, __pmd, __address)                         \
        do {                                                            \
                pmd_t *____pmd = (__pmd);                               \
                if (pmd_is_huge(*____pmd))                              \
                        __split_huge_pmd(__vma, __pmd, __address,       \
                                         false);                        \
        }  while (0)

void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
                bool freeze);

void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
                unsigned long address);

#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
int change_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma,
                    pud_t *pudp, unsigned long addr, pgprot_t newprot,
                    unsigned long cp_flags);
#else
static inline int
change_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma,
                pud_t *pudp, unsigned long addr, pgprot_t newprot,
                unsigned long cp_flags) { return 0; }
#endif

#define split_huge_pud(__vma, __pud, __address)                         \
        do {                                                            \
                pud_t *____pud = (__pud);                               \
                if (pud_trans_huge(*____pud))                           \
                        __split_huge_pud(__vma, __pud, __address);      \
        }  while (0)

int hugepage_madvise(struct vm_area_struct *vma, vm_flags_t *vm_flags,
                     int advice);
int madvise_collapse(struct vm_area_struct *vma, unsigned long start,
                     unsigned long end, bool *lock_dropped);
void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
                           unsigned long end, struct vm_area_struct *next);
spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma);
spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma);

/* mmap_lock must be held on entry */
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
                struct vm_area_struct *vma)
{
        if (pmd_is_huge(*pmd))
                return __pmd_trans_huge_lock(pmd, vma);

        return NULL;
}
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
                struct vm_area_struct *vma)
{
        if (pud_trans_huge(*pud))
                return __pud_trans_huge_lock(pud, vma);
        else
                return NULL;
}

/**
 * folio_test_pmd_mappable - Can we map this folio with a PMD?
 * @folio: The folio to test
 *
 * Return: true - @folio can be mapped, false - @folio cannot be mapped.
 */
static inline bool folio_test_pmd_mappable(struct folio *folio)
{
        return folio_order(folio) >= HPAGE_PMD_ORDER;
}

vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf);

vm_fault_t do_huge_pmd_device_private(struct vm_fault *vmf);

extern struct folio *huge_zero_folio;
extern unsigned long huge_zero_pfn;

static inline bool is_huge_zero_folio(const struct folio *folio)
{
        VM_WARN_ON_ONCE(!folio);

        return READ_ONCE(huge_zero_folio) == folio;
}

static inline bool is_huge_zero_pfn(unsigned long pfn)
{
        return READ_ONCE(huge_zero_pfn) == (pfn & ~(HPAGE_PMD_NR - 1));
}

static inline bool is_huge_zero_pmd(pmd_t pmd)
{
        return pmd_present(pmd) && is_huge_zero_pfn(pmd_pfn(pmd));
}

struct folio *mm_get_huge_zero_folio(struct mm_struct *mm);
void mm_put_huge_zero_folio(struct mm_struct *mm);

static inline struct folio *get_persistent_huge_zero_folio(void)
{
        if (!IS_ENABLED(CONFIG_PERSISTENT_HUGE_ZERO_FOLIO))
                return NULL;

        if (unlikely(!huge_zero_folio))
                return NULL;

        return huge_zero_folio;
}

static inline bool thp_migration_supported(void)
{
        return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
}

void split_huge_pmd_locked(struct vm_area_struct *vma, unsigned long address,
                           pmd_t *pmd, bool freeze);
bool unmap_huge_pmd_locked(struct vm_area_struct *vma, unsigned long addr,
                           pmd_t *pmdp, struct folio *folio);
void map_anon_folio_pmd_nopf(struct folio *folio, pmd_t *pmd,
                struct vm_area_struct *vma, unsigned long haddr);

#else /* CONFIG_TRANSPARENT_HUGEPAGE */

static inline bool folio_test_pmd_mappable(struct folio *folio)
{
        return false;
}

static inline bool thp_vma_suitable_order(struct vm_area_struct *vma,
                unsigned long addr, int order)
{
        return false;
}

static inline unsigned long thp_vma_suitable_orders(struct vm_area_struct *vma,
                unsigned long addr, unsigned long orders)
{
        return 0;
}

static inline unsigned long thp_vma_allowable_orders(struct vm_area_struct *vma,
                                        vm_flags_t vm_flags,
                                        enum tva_type type,
                                        unsigned long orders)
{
        return 0;
}

#define transparent_hugepage_flags 0UL

#define thp_get_unmapped_area   NULL

static inline unsigned long
thp_get_unmapped_area_vmflags(struct file *filp, unsigned long addr,
                              unsigned long len, unsigned long pgoff,
                              unsigned long flags, vm_flags_t vm_flags)
{
        return 0;
}

static inline bool
can_split_folio(struct folio *folio, int caller_pins, int *pextra_pins)
{
        return false;
}
static inline int
split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
                unsigned int new_order)
{
        VM_WARN_ON_ONCE_PAGE(1, page);
        return -EINVAL;
}
static inline int split_huge_page_to_order(struct page *page, unsigned int new_order)
{
        VM_WARN_ON_ONCE_PAGE(1, page);
        return -EINVAL;
}
static inline int split_huge_page(struct page *page)
{
        VM_WARN_ON_ONCE_PAGE(1, page);
        return -EINVAL;
}

static inline unsigned int min_order_for_split(struct folio *folio)
{
        VM_WARN_ON_ONCE_FOLIO(1, folio);
        return 0;
}

static inline int split_folio_to_list(struct folio *folio, struct list_head *list)
{
        VM_WARN_ON_ONCE_FOLIO(1, folio);
        return -EINVAL;
}

static inline int try_folio_split_to_order(struct folio *folio,
                struct page *page, unsigned int new_order)
{
        VM_WARN_ON_ONCE_FOLIO(1, folio);
        return -EINVAL;
}

static inline void deferred_split_folio(struct folio *folio, bool partially_mapped) {}
static inline void reparent_deferred_split_queue(struct mem_cgroup *memcg) {}
#define split_huge_pmd(__vma, __pmd, __address) \
        do { } while (0)

static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
                unsigned long address, bool freeze) {}
static inline void split_huge_pmd_address(struct vm_area_struct *vma,
                unsigned long address, bool freeze) {}
static inline void split_huge_pmd_locked(struct vm_area_struct *vma,
                                         unsigned long address, pmd_t *pmd,
                                         bool freeze) {}

static inline bool unmap_huge_pmd_locked(struct vm_area_struct *vma,
                                         unsigned long addr, pmd_t *pmdp,
                                         struct folio *folio)
{
        return false;
}

#define split_huge_pud(__vma, __pmd, __address) \
        do { } while (0)

static inline int hugepage_madvise(struct vm_area_struct *vma,
                                   vm_flags_t *vm_flags, int advice)
{
        return -EINVAL;
}

static inline int madvise_collapse(struct vm_area_struct *vma,
                                   unsigned long start,
                                   unsigned long end, bool *lock_dropped)
{
        return -EINVAL;
}

static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
                                         unsigned long start,
                                         unsigned long end,
                                         struct vm_area_struct *next)
{
}
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
                struct vm_area_struct *vma)
{
        return NULL;
}
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
                struct vm_area_struct *vma)
{
        return NULL;
}

static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
{
        return 0;
}

static inline vm_fault_t do_huge_pmd_device_private(struct vm_fault *vmf)
{
        return 0;
}

static inline bool is_huge_zero_folio(const struct folio *folio)
{
        return false;
}

static inline bool is_huge_zero_pfn(unsigned long pfn)
{
        return false;
}

static inline bool is_huge_zero_pmd(pmd_t pmd)
{
        return false;
}

static inline void mm_put_huge_zero_folio(struct mm_struct *mm)
{
        return;
}

static inline bool thp_migration_supported(void)
{
        return false;
}

static inline int highest_order(unsigned long orders)
{
        return 0;
}

static inline int next_order(unsigned long *orders, int prev)
{
        return 0;
}

static inline void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
                                    unsigned long address)
{
}

static inline int change_huge_pud(struct mmu_gather *tlb,
                                  struct vm_area_struct *vma, pud_t *pudp,
                                  unsigned long addr, pgprot_t newprot,
                                  unsigned long cp_flags)
{
        return 0;
}

static inline struct folio *get_persistent_huge_zero_folio(void)
{
        return NULL;
}

static inline bool pmd_is_huge(pmd_t pmd)
{
        return false;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

static inline int split_folio_to_list_to_order(struct folio *folio,
                struct list_head *list, int new_order)
{
        return split_huge_page_to_list_to_order(&folio->page, list, new_order);
}

static inline int split_folio_to_order(struct folio *folio, int new_order)
{
        return split_folio_to_list_to_order(folio, NULL, new_order);
}

/**
 * largest_zero_folio - Get the largest zero size folio available
 *
 * This function shall be used when mm_get_huge_zero_folio() cannot be
 * used as there is no appropriate mm lifetime to tie the huge zero folio
 * from the caller.
 *
 * Deduce the size of the folio with folio_size instead of assuming the
 * folio size.
 *
 * Return: pointer to PMD sized zero folio if CONFIG_PERSISTENT_HUGE_ZERO_FOLIO
 * is enabled or a single page sized zero folio
 */
static inline struct folio *largest_zero_folio(void)
{
        struct folio *folio = get_persistent_huge_zero_folio();

        if (folio)
                return folio;

        return page_folio(ZERO_PAGE(0));
}
#endif /* _LINUX_HUGE_MM_H */