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

#include <linux/mm.h>
#include <linux/mm_types.h>
#include <linux/mmdebug.h>
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>
#include <linux/cgroup.h>
#include <linux/page_ref.h>
#include <linux/list.h>
#include <linux/kref.h>
#include <linux/pgtable.h>
#include <linux/gfp.h>
#include <linux/userfaultfd_k.h>

struct ctl_table;
struct user_struct;
struct mmu_gather;
struct node;

#ifndef CONFIG_ARCH_HAS_HUGEPD
typedef struct { unsigned long pd; } hugepd_t;
#define is_hugepd(hugepd) (0)
#define __hugepd(x) ((hugepd_t) { (x) })
#endif

void free_huge_folio(struct folio *folio);

#ifdef CONFIG_HUGETLB_PAGE

#include <linux/pagemap.h>
#include <linux/shm.h>
#include <asm/tlbflush.h>

/*
 * For HugeTLB page, there are more metadata to save in the struct page. But
 * the head struct page cannot meet our needs, so we have to abuse other tail
 * struct page to store the metadata.
 */
#define __NR_USED_SUBPAGE 3

struct hugepage_subpool {
	spinlock_t lock;
	long count;
	long max_hpages;	/* Maximum huge pages or -1 if no maximum. */
	long used_hpages;	/* Used count against maximum, includes */
				/* both allocated and reserved pages. */
	struct hstate *hstate;
	long min_hpages;	/* Minimum huge pages or -1 if no minimum. */
	long rsv_hpages;	/* Pages reserved against global pool to */
				/* satisfy minimum size. */
};

struct resv_map {
	struct kref refs;
	spinlock_t lock;
	struct list_head regions;
	long adds_in_progress;
	struct list_head region_cache;
	long region_cache_count;
	struct rw_semaphore rw_sema;
#ifdef CONFIG_CGROUP_HUGETLB
	/*
	 * On private mappings, the counter to uncharge reservations is stored
	 * here. If these fields are 0, then either the mapping is shared, or
	 * cgroup accounting is disabled for this resv_map.
	 */
	struct page_counter *reservation_counter;
	unsigned long pages_per_hpage;
	struct cgroup_subsys_state *css;
#endif
};

/*
 * Region tracking -- allows tracking of reservations and instantiated pages
 *                    across the pages in a mapping.
 *
 * The region data structures are embedded into a resv_map and protected
 * by a resv_map's lock.  The set of regions within the resv_map represent
 * reservations for huge pages, or huge pages that have already been
 * instantiated within the map.  The from and to elements are huge page
 * indices into the associated mapping.  from indicates the starting index
 * of the region.  to represents the first index past the end of  the region.
 *
 * For example, a file region structure with from == 0 and to == 4 represents
 * four huge pages in a mapping.  It is important to note that the to element
 * represents the first element past the end of the region. This is used in
 * arithmetic as 4(to) - 0(from) = 4 huge pages in the region.
 *
 * Interval notation of the form [from, to) will be used to indicate that
 * the endpoint from is inclusive and to is exclusive.
 */
struct file_region {
	struct list_head link;
	long from;
	long to;
#ifdef CONFIG_CGROUP_HUGETLB
	/*
	 * On shared mappings, each reserved region appears as a struct
	 * file_region in resv_map. These fields hold the info needed to
	 * uncharge each reservation.
	 */
	struct page_counter *reservation_counter;
	struct cgroup_subsys_state *css;
#endif
};

struct hugetlb_vma_lock {
	struct kref refs;
	struct rw_semaphore rw_sema;
	struct vm_area_struct *vma;
};

extern struct resv_map *resv_map_alloc(void);
void resv_map_release(struct kref *ref);

extern spinlock_t hugetlb_lock;
extern int hugetlb_max_hstate __read_mostly;
#define for_each_hstate(h) \
	for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)

struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
						long min_hpages);
void hugepage_put_subpool(struct hugepage_subpool *spool);

void hugetlb_dup_vma_private(struct vm_area_struct *vma);
void clear_vma_resv_huge_pages(struct vm_area_struct *vma);
int move_hugetlb_page_tables(struct vm_area_struct *vma,
			     struct vm_area_struct *new_vma,
			     unsigned long old_addr, unsigned long new_addr,
			     unsigned long len);
int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *,
			    struct vm_area_struct *, struct vm_area_struct *);
struct page *hugetlb_follow_page_mask(struct vm_area_struct *vma,
				      unsigned long address, unsigned int flags,
				      unsigned int *page_mask);
void unmap_hugepage_range(struct vm_area_struct *,
			  unsigned long, unsigned long, struct page *,
			  zap_flags_t);
void __unmap_hugepage_range(struct mmu_gather *tlb,
			  struct vm_area_struct *vma,
			  unsigned long start, unsigned long end,
			  struct page *ref_page, zap_flags_t zap_flags);
void hugetlb_report_meminfo(struct seq_file *);
int hugetlb_report_node_meminfo(char *buf, int len, int nid);
void hugetlb_show_meminfo_node(int nid);
unsigned long hugetlb_total_pages(void);
vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
			unsigned long address, unsigned int flags);
#ifdef CONFIG_USERFAULTFD
int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
			     struct vm_area_struct *dst_vma,
			     unsigned long dst_addr,
			     unsigned long src_addr,
			     uffd_flags_t flags,
			     struct folio **foliop);
#endif /* CONFIG_USERFAULTFD */
bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
						struct vm_area_struct *vma,
						vm_flags_t vm_flags);
long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
						long freed);
bool isolate_hugetlb(struct folio *folio, struct list_head *list);
int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison);
int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
				bool *migratable_cleared);
void folio_putback_active_hugetlb(struct folio *folio);
void move_hugetlb_state(struct folio *old_folio, struct folio *new_folio, int reason);
void hugetlb_fix_reserve_counts(struct inode *inode);
extern struct mutex *hugetlb_fault_mutex_table;
u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);

pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma,
		      unsigned long addr, pud_t *pud);

struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);

extern int sysctl_hugetlb_shm_group;
extern struct list_head huge_boot_pages;

/* arch callbacks */

#ifndef CONFIG_HIGHPTE
/*
 * pte_offset_huge() and pte_alloc_huge() are helpers for those architectures
 * which may go down to the lowest PTE level in their huge_pte_offset() and
 * huge_pte_alloc(): to avoid reliance on pte_offset_map() without pte_unmap().
 */
static inline pte_t *pte_offset_huge(pmd_t *pmd, unsigned long address)
{
	return pte_offset_kernel(pmd, address);
}
static inline pte_t *pte_alloc_huge(struct mm_struct *mm, pmd_t *pmd,
				    unsigned long address)
{
	return pte_alloc(mm, pmd) ? NULL : pte_offset_huge(pmd, address);
}
#endif

pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
			unsigned long addr, unsigned long sz);
/*
 * huge_pte_offset(): Walk the hugetlb pgtable until the last level PTE.
 * Returns the pte_t* if found, or NULL if the address is not mapped.
 *
 * IMPORTANT: we should normally not directly call this function, instead
 * this is only a common interface to implement arch-specific
 * walker. Please use hugetlb_walk() instead, because that will attempt to
 * verify the locking for you.
 *
 * Since this function will walk all the pgtable pages (including not only
 * high-level pgtable page, but also PUD entry that can be unshared
 * concurrently for VM_SHARED), the caller of this function should be
 * responsible of its thread safety.  One can follow this rule:
 *
 *  (1) For private mappings: pmd unsharing is not possible, so holding the
 *      mmap_lock for either read or write is sufficient. Most callers
 *      already hold the mmap_lock, so normally, no special action is
 *      required.
 *
 *  (2) For shared mappings: pmd unsharing is possible (so the PUD-ranged
 *      pgtable page can go away from under us!  It can be done by a pmd
 *      unshare with a follow up munmap() on the other process), then we
 *      need either:
 *
 *     (2.1) hugetlb vma lock read or write held, to make sure pmd unshare
 *           won't happen upon the range (it also makes sure the pte_t we
 *           read is the right and stable one), or,
 *
 *     (2.2) hugetlb mapping i_mmap_rwsem lock held read or write, to make
 *           sure even if unshare happened the racy unmap() will wait until
 *           i_mmap_rwsem is released.
 *
 * Option (2.1) is the safest, which guarantees pte stability from pmd
 * sharing pov, until the vma lock released.  Option (2.2) doesn't protect
 * a concurrent pmd unshare, but it makes sure the pgtable page is safe to
 * access.
 */
pte_t *huge_pte_offset(struct mm_struct *mm,
		       unsigned long addr, unsigned long sz);
unsigned long hugetlb_mask_last_page(struct hstate *h);
int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma,
				unsigned long addr, pte_t *ptep);
void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
				unsigned long *start, unsigned long *end);

extern void __hugetlb_zap_begin(struct vm_area_struct *vma,
				unsigned long *begin, unsigned long *end);
extern void __hugetlb_zap_end(struct vm_area_struct *vma,
			      struct zap_details *details);

static inline void hugetlb_zap_begin(struct vm_area_struct *vma,
				     unsigned long *start, unsigned long *end)
{
	if (is_vm_hugetlb_page(vma))
		__hugetlb_zap_begin(vma, start, end);
}

static inline void hugetlb_zap_end(struct vm_area_struct *vma,
				   struct zap_details *details)
{
	if (is_vm_hugetlb_page(vma))
		__hugetlb_zap_end(vma, details);
}

void hugetlb_vma_lock_read(struct vm_area_struct *vma);
void hugetlb_vma_unlock_read(struct vm_area_struct *vma);
void hugetlb_vma_lock_write(struct vm_area_struct *vma);
void hugetlb_vma_unlock_write(struct vm_area_struct *vma);
int hugetlb_vma_trylock_write(struct vm_area_struct *vma);
void hugetlb_vma_assert_locked(struct vm_area_struct *vma);
void hugetlb_vma_lock_release(struct kref *kref);

int pmd_huge(pmd_t pmd);
int pud_huge(pud_t pud);
long hugetlb_change_protection(struct vm_area_struct *vma,
		unsigned long address, unsigned long end, pgprot_t newprot,
		unsigned long cp_flags);

bool is_hugetlb_entry_migration(pte_t pte);
bool is_hugetlb_entry_hwpoisoned(pte_t pte);
void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);

#else /* !CONFIG_HUGETLB_PAGE */

static inline void hugetlb_dup_vma_private(struct vm_area_struct *vma)
{
}

static inline void clear_vma_resv_huge_pages(struct vm_area_struct *vma)
{
}

static inline unsigned long hugetlb_total_pages(void)
{
	return 0;
}

static inline struct address_space *hugetlb_page_mapping_lock_write(
							struct page *hpage)
{
	return NULL;
}

static inline int huge_pmd_unshare(struct mm_struct *mm,
					struct vm_area_struct *vma,
					unsigned long addr, pte_t *ptep)
{
	return 0;
}

static inline void adjust_range_if_pmd_sharing_possible(
				struct vm_area_struct *vma,
				unsigned long *start, unsigned long *end)
{
}

static inline void hugetlb_zap_begin(
				struct vm_area_struct *vma,
				unsigned long *start, unsigned long *end)
{
}

static inline void hugetlb_zap_end(
				struct vm_area_struct *vma,
				struct zap_details *details)
{
}

static inline struct page *hugetlb_follow_page_mask(
    struct vm_area_struct *vma, unsigned long address, unsigned int flags,
    unsigned int *page_mask)
{
	BUILD_BUG(); /* should never be compiled in if !CONFIG_HUGETLB_PAGE*/
}

static inline int copy_hugetlb_page_range(struct mm_struct *dst,
					  struct mm_struct *src,
					  struct vm_area_struct *dst_vma,
					  struct vm_area_struct *src_vma)
{
	BUG();
	return 0;
}

static inline int move_hugetlb_page_tables(struct vm_area_struct *vma,
					   struct vm_area_struct *new_vma,
					   unsigned long old_addr,
					   unsigned long new_addr,
					   unsigned long len)
{
	BUG();
	return 0;
}

static inline void hugetlb_report_meminfo(struct seq_file *m)
{
}

static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid)
{
	return 0;
}

static inline void hugetlb_show_meminfo_node(int nid)
{
}

static inline int prepare_hugepage_range(struct file *file,
				unsigned long addr, unsigned long len)
{
	return -EINVAL;
}

static inline void hugetlb_vma_lock_read(struct vm_area_struct *vma)
{
}

static inline void hugetlb_vma_unlock_read(struct vm_area_struct *vma)
{
}

static inline void hugetlb_vma_lock_write(struct vm_area_struct *vma)
{
}

static inline void hugetlb_vma_unlock_write(struct vm_area_struct *vma)
{
}

static inline int hugetlb_vma_trylock_write(struct vm_area_struct *vma)
{
	return 1;
}

static inline void hugetlb_vma_assert_locked(struct vm_area_struct *vma)
{
}

static inline int pmd_huge(pmd_t pmd)
{
	return 0;
}

static inline int pud_huge(pud_t pud)
{
	return 0;
}

static inline int is_hugepage_only_range(struct mm_struct *mm,
					unsigned long addr, unsigned long len)
{
	return 0;
}

static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
				unsigned long addr, unsigned long end,
				unsigned long floor, unsigned long ceiling)
{
	BUG();
}

#ifdef CONFIG_USERFAULTFD
static inline int hugetlb_mfill_atomic_pte(pte_t *dst_pte,
					   struct vm_area_struct *dst_vma,
					   unsigned long dst_addr,
					   unsigned long src_addr,
					   uffd_flags_t flags,
					   struct folio **foliop)
{
	BUG();
	return 0;
}
#endif /* CONFIG_USERFAULTFD */

static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
					unsigned long sz)
{
	return NULL;
}

static inline bool isolate_hugetlb(struct folio *folio, struct list_head *list)
{
	return false;
}

static inline int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison)
{
	return 0;
}

static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags,
					bool *migratable_cleared)
{
	return 0;
}

static inline void folio_putback_active_hugetlb(struct folio *folio)
{
}

static inline void move_hugetlb_state(struct folio *old_folio,
					struct folio *new_folio, int reason)
{
}

static inline long hugetlb_change_protection(
			struct vm_area_struct *vma, unsigned long address,
			unsigned long end, pgprot_t newprot,
			unsigned long cp_flags)
{
	return 0;
}

static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
			struct vm_area_struct *vma, unsigned long start,
			unsigned long end, struct page *ref_page,
			zap_flags_t zap_flags)
{
	BUG();
}

static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
			struct vm_area_struct *vma, unsigned long address,
			unsigned int flags)
{
	BUG();
	return 0;
}

static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }

#endif /* !CONFIG_HUGETLB_PAGE */
/*
 * hugepages at page global directory. If arch support
 * hugepages at pgd level, they need to define this.
 */
#ifndef pgd_huge
#define pgd_huge(x)	0
#endif
#ifndef p4d_huge
#define p4d_huge(x)	0
#endif

#ifndef pgd_write
static inline int pgd_write(pgd_t pgd)
{
	BUG();
	return 0;
}
#endif

#define HUGETLB_ANON_FILE "anon_hugepage"

enum {
	/*
	 * The file will be used as an shm file so shmfs accounting rules
	 * apply
	 */
	HUGETLB_SHMFS_INODE     = 1,
	/*
	 * The file is being created on the internal vfs mount and shmfs
	 * accounting rules do not apply
	 */
	HUGETLB_ANONHUGE_INODE  = 2,
};

#ifdef CONFIG_HUGETLBFS
struct hugetlbfs_sb_info {
	long	max_inodes;   /* inodes allowed */
	long	free_inodes;  /* inodes free */
	spinlock_t	stat_lock;
	struct hstate *hstate;
	struct hugepage_subpool *spool;
	kuid_t	uid;
	kgid_t	gid;
	umode_t mode;
};

static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

struct hugetlbfs_inode_info {
	struct inode vfs_inode;
	unsigned int seals;
};

static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
{
	return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}

extern const struct file_operations hugetlbfs_file_operations;
extern const struct vm_operations_struct hugetlb_vm_ops;
struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
				int creat_flags, int page_size_log);

static inline bool is_file_hugepages(struct file *file)
{
	if (file->f_op == &hugetlbfs_file_operations)
		return true;

	return is_file_shm_hugepages(file);
}

static inline struct hstate *hstate_inode(struct inode *i)
{
	return HUGETLBFS_SB(i->i_sb)->hstate;
}
#else /* !CONFIG_HUGETLBFS */

#define is_file_hugepages(file)			false
static inline struct file *
hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
		int creat_flags, int page_size_log)
{
	return ERR_PTR(-ENOSYS);
}

static inline struct hstate *hstate_inode(struct inode *i)
{
	return NULL;
}
#endif /* !CONFIG_HUGETLBFS */

#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
					unsigned long len, unsigned long pgoff,
					unsigned long flags);
#endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */

unsigned long
generic_hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
				  unsigned long len, unsigned long pgoff,
				  unsigned long flags);

/*
 * huegtlb page specific state flags.  These flags are located in page.private
 * of the hugetlb head page.  Functions created via the below macros should be
 * used to manipulate these flags.
 *
 * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
 *	allocation time.  Cleared when page is fully instantiated.  Free
 *	routine checks flag to restore a reservation on error paths.
 *	Synchronization:  Examined or modified by code that knows it has
 *	the only reference to page.  i.e. After allocation but before use
 *	or when the page is being freed.
 * HPG_migratable  - Set after a newly allocated page is added to the page
 *	cache and/or page tables.  Indicates the page is a candidate for
 *	migration.
 *	Synchronization:  Initially set after new page allocation with no
 *	locking.  When examined and modified during migration processing
 *	(isolate, migrate, putback) the hugetlb_lock is held.
 * HPG_temporary - Set on a page that is temporarily allocated from the buddy
 *	allocator.  Typically used for migration target pages when no pages
 *	are available in the pool.  The hugetlb free page path will
 *	immediately free pages with this flag set to the buddy allocator.
 *	Synchronization: Can be set after huge page allocation from buddy when
 *	code knows it has only reference.  All other examinations and
 *	modifications require hugetlb_lock.
 * HPG_freed - Set when page is on the free lists.
 *	Synchronization: hugetlb_lock held for examination and modification.
 * HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed.
 * HPG_raw_hwp_unreliable - Set when the hugetlb page has a hwpoison sub-page
 *     that is not tracked by raw_hwp_page list.
 */
enum hugetlb_page_flags {
	HPG_restore_reserve = 0,
	HPG_migratable,
	HPG_temporary,
	HPG_freed,
	HPG_vmemmap_optimized,
	HPG_raw_hwp_unreliable,
	__NR_HPAGEFLAGS,
};

/*
 * Macros to create test, set and clear function definitions for
 * hugetlb specific page flags.
 */
#ifdef CONFIG_HUGETLB_PAGE
#define TESTHPAGEFLAG(uname, flname)				\
static __always_inline						\
bool folio_test_hugetlb_##flname(struct folio *folio)		\
	{	void *private = &folio->private;		\
		return test_bit(HPG_##flname, private);		\
	}							\
static inline int HPage##uname(struct page *page)		\
	{ return test_bit(HPG_##flname, &(page->private)); }

#define SETHPAGEFLAG(uname, flname)				\
static __always_inline						\
void folio_set_hugetlb_##flname(struct folio *folio)		\
	{	void *private = &folio->private;		\
		set_bit(HPG_##flname, private);			\
	}							\
static inline void SetHPage##uname(struct page *page)		\
	{ set_bit(HPG_##flname, &(page->private)); }

#define CLEARHPAGEFLAG(uname, flname)				\
static __always_inline						\
void folio_clear_hugetlb_##flname(struct folio *folio)		\
	{	void *private = &folio->private;		\
		clear_bit(HPG_##flname, private);		\
	}							\
static inline void ClearHPage##uname(struct page *page)		\
	{ clear_bit(HPG_##flname, &(page->private)); }
#else
#define TESTHPAGEFLAG(uname, flname)				\
static inline bool						\
folio_test_hugetlb_##flname(struct folio *folio)		\
	{ return 0; }						\
static inline int HPage##uname(struct page *page)		\
	{ return 0; }

#define SETHPAGEFLAG(uname, flname)				\
static inline void						\
folio_set_hugetlb_##flname(struct folio *folio) 		\
	{ }							\
static inline void SetHPage##uname(struct page *page)		\
	{ }

#define CLEARHPAGEFLAG(uname, flname)				\
static inline void						\
folio_clear_hugetlb_##flname(struct folio *folio)		\
	{ }							\
static inline void ClearHPage##uname(struct page *page)		\
	{ }
#endif

#define HPAGEFLAG(uname, flname)				\
	TESTHPAGEFLAG(uname, flname)				\
	SETHPAGEFLAG(uname, flname)				\
	CLEARHPAGEFLAG(uname, flname)				\

/*
 * Create functions associated with hugetlb page flags
 */
HPAGEFLAG(RestoreReserve, restore_reserve)
HPAGEFLAG(Migratable, migratable)
HPAGEFLAG(Temporary, temporary)
HPAGEFLAG(Freed, freed)
HPAGEFLAG(VmemmapOptimized, vmemmap_optimized)
HPAGEFLAG(RawHwpUnreliable, raw_hwp_unreliable)

#ifdef CONFIG_HUGETLB_PAGE

#define HSTATE_NAME_LEN 32
/* Defines one hugetlb page size */
struct hstate {
	struct mutex resize_lock;
	struct lock_class_key resize_key;
	int next_nid_to_alloc;
	int next_nid_to_free;
	unsigned int order;
	unsigned int demote_order;
	unsigned long mask;
	unsigned long max_huge_pages;
	unsigned long nr_huge_pages;
	unsigned long free_huge_pages;
	unsigned long resv_huge_pages;
	unsigned long surplus_huge_pages;
	unsigned long nr_overcommit_huge_pages;
	struct list_head hugepage_activelist;
	struct list_head hugepage_freelists[MAX_NUMNODES];
	unsigned int max_huge_pages_node[MAX_NUMNODES];
	unsigned int nr_huge_pages_node[MAX_NUMNODES];
	unsigned int free_huge_pages_node[MAX_NUMNODES];
	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
#ifdef CONFIG_CGROUP_HUGETLB
	/* cgroup control files */
	struct cftype cgroup_files_dfl[8];
	struct cftype cgroup_files_legacy[10];
#endif
	char name[HSTATE_NAME_LEN];
};

struct huge_bootmem_page {
	struct list_head list;
	struct hstate *hstate;
};

int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
				unsigned long addr, int avoid_reserve);
struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
				nodemask_t *nmask, gfp_t gfp_mask);
int hugetlb_add_to_page_cache(struct folio *folio, struct address_space *mapping,
			pgoff_t idx);
void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
				unsigned long address, struct folio *folio);

/* arch callback */
int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);
int __init alloc_bootmem_huge_page(struct hstate *h, int nid);
bool __init hugetlb_node_alloc_supported(void);

void __init hugetlb_add_hstate(unsigned order);
bool __init arch_hugetlb_valid_size(unsigned long size);
struct hstate *size_to_hstate(unsigned long size);

#ifndef HUGE_MAX_HSTATE
#define HUGE_MAX_HSTATE 1
#endif

extern struct hstate hstates[HUGE_MAX_HSTATE];
extern unsigned int default_hstate_idx;

#define default_hstate (hstates[default_hstate_idx])

static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio)
{
	return folio->_hugetlb_subpool;
}

static inline void hugetlb_set_folio_subpool(struct folio *folio,
					struct hugepage_subpool *subpool)
{
	folio->_hugetlb_subpool = subpool;
}

static inline struct hstate *hstate_file(struct file *f)
{
	return hstate_inode(file_inode(f));
}

static inline struct hstate *hstate_sizelog(int page_size_log)
{
	if (!page_size_log)
		return &default_hstate;

	if (page_size_log < BITS_PER_LONG)
		return size_to_hstate(1UL << page_size_log);

	return NULL;
}

static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
{
	return hstate_file(vma->vm_file);
}

static inline unsigned long huge_page_size(const struct hstate *h)
{
	return (unsigned long)PAGE_SIZE << h->order;
}

extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);

extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);

static inline unsigned long huge_page_mask(struct hstate *h)
{
	return h->mask;
}

static inline unsigned int huge_page_order(struct hstate *h)
{
	return h->order;
}

static inline unsigned huge_page_shift(struct hstate *h)
{
	return h->order + PAGE_SHIFT;
}

static inline bool hstate_is_gigantic(struct hstate *h)
{
	return huge_page_order(h) > MAX_PAGE_ORDER;
}

static inline unsigned int pages_per_huge_page(const struct hstate *h)
{
	return 1 << h->order;
}

static inline unsigned int blocks_per_huge_page(struct hstate *h)
{
	return huge_page_size(h) / 512;
}

static inline struct folio *filemap_lock_hugetlb_folio(struct hstate *h,
				struct address_space *mapping, pgoff_t idx)
{
	return filemap_lock_folio(mapping, idx << huge_page_order(h));
}

#include <asm/hugetlb.h>

#ifndef is_hugepage_only_range
static inline int is_hugepage_only_range(struct mm_struct *mm,
					unsigned long addr, unsigned long len)
{
	return 0;
}
#define is_hugepage_only_range is_hugepage_only_range
#endif

#ifndef arch_clear_hugepage_flags
static inline void arch_clear_hugepage_flags(struct page *page) { }
#define arch_clear_hugepage_flags arch_clear_hugepage_flags
#endif

#ifndef arch_make_huge_pte
static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift,
				       vm_flags_t flags)
{
	return pte_mkhuge(entry);
}
#endif

static inline struct hstate *folio_hstate(struct folio *folio)
{
	VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio);
	return size_to_hstate(folio_size(folio));
}

static inline unsigned hstate_index_to_shift(unsigned index)
{
	return hstates[index].order + PAGE_SHIFT;
}

static inline int hstate_index(struct hstate *h)
{
	return h - hstates;
}

extern int dissolve_free_huge_page(struct page *page);
extern int dissolve_free_huge_pages(unsigned long start_pfn,
				    unsigned long end_pfn);

#ifdef CONFIG_MEMORY_FAILURE
extern void folio_clear_hugetlb_hwpoison(struct folio *folio);
#else
static inline void folio_clear_hugetlb_hwpoison(struct folio *folio)
{
}
#endif

#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
#ifndef arch_hugetlb_migration_supported
static inline bool arch_hugetlb_migration_supported(struct hstate *h)
{
	if ((huge_page_shift(h) == PMD_SHIFT) ||
		(huge_page_shift(h) == PUD_SHIFT) ||
			(huge_page_shift(h) == PGDIR_SHIFT))
		return true;
	else
		return false;
}
#endif
#else
static inline bool arch_hugetlb_migration_supported(struct hstate *h)
{
	return false;
}
#endif

static inline bool hugepage_migration_supported(struct hstate *h)
{
	return arch_hugetlb_migration_supported(h);
}

/*
 * Movability check is different as compared to migration check.
 * It determines whether or not a huge page should be placed on
 * movable zone or not. Movability of any huge page should be
 * required only if huge page size is supported for migration.
 * There won't be any reason for the huge page to be movable if
 * it is not migratable to start with. Also the size of the huge
 * page should be large enough to be placed under a movable zone
 * and still feasible enough to be migratable. Just the presence
 * in movable zone does not make the migration feasible.
 *
 * So even though large huge page sizes like the gigantic ones
 * are migratable they should not be movable because its not
 * feasible to migrate them from movable zone.
 */
static inline bool hugepage_movable_supported(struct hstate *h)
{
	if (!hugepage_migration_supported(h))
		return false;

	if (hstate_is_gigantic(h))
		return false;
	return true;
}

/* Movability of hugepages depends on migration support. */
static inline gfp_t htlb_alloc_mask(struct hstate *h)
{
	if (hugepage_movable_supported(h))
		return GFP_HIGHUSER_MOVABLE;
	else
		return GFP_HIGHUSER;
}

static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
{
	gfp_t modified_mask = htlb_alloc_mask(h);

	/* Some callers might want to enforce node */
	modified_mask |= (gfp_mask & __GFP_THISNODE);

	modified_mask |= (gfp_mask & __GFP_NOWARN);

	return modified_mask;
}

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	if (huge_page_size(h) == PMD_SIZE)
		return pmd_lockptr(mm, (pmd_t *) pte);
	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
	return &mm->page_table_lock;
}

#ifndef hugepages_supported
/*
 * Some platform decide whether they support huge pages at boot
 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
 * when there is no such support
 */
#define hugepages_supported() (HPAGE_SHIFT != 0)
#endif

void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);

static inline void hugetlb_count_init(struct mm_struct *mm)
{
	atomic_long_set(&mm->hugetlb_usage, 0);
}

static inline void hugetlb_count_add(long l, struct mm_struct *mm)
{
	atomic_long_add(l, &mm->hugetlb_usage);
}

static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
{
	atomic_long_sub(l, &mm->hugetlb_usage);
}

#ifndef huge_ptep_modify_prot_start
#define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
						unsigned long addr, pte_t *ptep)
{
	return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
}
#endif

#ifndef huge_ptep_modify_prot_commit
#define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
						unsigned long addr, pte_t *ptep,
						pte_t old_pte, pte_t pte)
{
	unsigned long psize = huge_page_size(hstate_vma(vma));

	set_huge_pte_at(vma->vm_mm, addr, ptep, pte, psize);
}
#endif

#ifdef CONFIG_NUMA
void hugetlb_register_node(struct node *node);
void hugetlb_unregister_node(struct node *node);
#endif

/*
 * Check if a given raw @page in a hugepage is HWPOISON.
 */
bool is_raw_hwpoison_page_in_hugepage(struct page *page);

#else	/* CONFIG_HUGETLB_PAGE */
struct hstate {};

static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio)
{
	return NULL;
}

static inline struct folio *filemap_lock_hugetlb_folio(struct hstate *h,
				struct address_space *mapping, pgoff_t idx)
{
	return NULL;
}

static inline int isolate_or_dissolve_huge_page(struct page *page,
						struct list_head *list)
{
	return -ENOMEM;
}

static inline struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
					   unsigned long addr,
					   int avoid_reserve)
{
	return NULL;
}

static inline struct folio *
alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
			nodemask_t *nmask, gfp_t gfp_mask)
{
	return NULL;
}

static inline int __alloc_bootmem_huge_page(struct hstate *h)
{
	return 0;
}

static inline struct hstate *hstate_file(struct file *f)
{
	return NULL;
}

static inline struct hstate *hstate_sizelog(int page_size_log)
{
	return NULL;
}

static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
{
	return NULL;
}

static inline struct hstate *folio_hstate(struct folio *folio)
{
	return NULL;
}

static inline struct hstate *size_to_hstate(unsigned long size)
{
	return NULL;
}

static inline unsigned long huge_page_size(struct hstate *h)
{
	return PAGE_SIZE;
}

static inline unsigned long huge_page_mask(struct hstate *h)
{
	return PAGE_MASK;
}

static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
{
	return PAGE_SIZE;
}

static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
{
	return PAGE_SIZE;
}

static inline unsigned int huge_page_order(struct hstate *h)
{
	return 0;
}

static inline unsigned int huge_page_shift(struct hstate *h)
{
	return PAGE_SHIFT;
}

static inline bool hstate_is_gigantic(struct hstate *h)
{
	return false;
}

static inline unsigned int pages_per_huge_page(struct hstate *h)
{
	return 1;
}

static inline unsigned hstate_index_to_shift(unsigned index)
{
	return 0;
}

static inline int hstate_index(struct hstate *h)
{
	return 0;
}

static inline int dissolve_free_huge_page(struct page *page)
{
	return 0;
}

static inline int dissolve_free_huge_pages(unsigned long start_pfn,
					   unsigned long end_pfn)
{
	return 0;
}

static inline bool hugepage_migration_supported(struct hstate *h)
{
	return false;
}

static inline bool hugepage_movable_supported(struct hstate *h)
{
	return false;
}

static inline gfp_t htlb_alloc_mask(struct hstate *h)
{
	return 0;
}

static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask)
{
	return 0;
}

static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
					   struct mm_struct *mm, pte_t *pte)
{
	return &mm->page_table_lock;
}

static inline void hugetlb_count_init(struct mm_struct *mm)
{
}

static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
{
}

static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
{
}

static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
					  unsigned long addr, pte_t *ptep)
{
#ifdef CONFIG_MMU
	return ptep_get(ptep);
#else
	return *ptep;
#endif
}

static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
				   pte_t *ptep, pte_t pte, unsigned long sz)
{
}

static inline void hugetlb_register_node(struct node *node)
{
}

static inline void hugetlb_unregister_node(struct node *node)
{
}
#endif	/* CONFIG_HUGETLB_PAGE */

static inline spinlock_t *huge_pte_lock(struct hstate *h,
					struct mm_struct *mm, pte_t *pte)
{
	spinlock_t *ptl;

	ptl = huge_pte_lockptr(h, mm, pte);
	spin_lock(ptl);
	return ptl;
}

#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
extern void __init hugetlb_cma_reserve(int order);
#else
static inline __init void hugetlb_cma_reserve(int order)
{
}
#endif

#ifdef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
static inline bool hugetlb_pmd_shared(pte_t *pte)
{
	return page_count(virt_to_page(pte)) > 1;
}
#else
static inline bool hugetlb_pmd_shared(pte_t *pte)
{
	return false;
}
#endif

bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);

#ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
/*
 * ARCHes with special requirements for evicting HUGETLB backing TLB entries can
 * implement this.
 */
#define flush_hugetlb_tlb_range(vma, addr, end)	flush_tlb_range(vma, addr, end)
#endif

static inline bool __vma_shareable_lock(struct vm_area_struct *vma)
{
	return (vma->vm_flags & VM_MAYSHARE) && vma->vm_private_data;
}

bool __vma_private_lock(struct vm_area_struct *vma);

/*
 * Safe version of huge_pte_offset() to check the locks.  See comments
 * above huge_pte_offset().
 */
static inline pte_t *
hugetlb_walk(struct vm_area_struct *vma, unsigned long addr, unsigned long sz)
{
#if defined(CONFIG_HUGETLB_PAGE) && \
	defined(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) && defined(CONFIG_LOCKDEP)
	struct hugetlb_vma_lock *vma_lock = vma->vm_private_data;

	/*
	 * If pmd sharing possible, locking needed to safely walk the
	 * hugetlb pgtables.  More information can be found at the comment
	 * above huge_pte_offset() in the same file.
	 *
	 * NOTE: lockdep_is_held() is only defined with CONFIG_LOCKDEP.
	 */
	if (__vma_shareable_lock(vma))
		WARN_ON_ONCE(!lockdep_is_held(&vma_lock->rw_sema) &&
			     !lockdep_is_held(
				 &vma->vm_file->f_mapping->i_mmap_rwsem));
#endif
	return huge_pte_offset(vma->vm_mm, addr, sz);
}

#endif /* _LINUX_HUGETLB_H */
¿Qué es la limpieza dental de perros? - Clínica veterinaria


Es la eliminación del sarro y la placa adherida a la superficie de los dientes mediante un equipo de ultrasonidos que garantiza la integridad de las piezas dentales a la vez que elimina en profundidad cualquier resto de suciedad.

A continuación se procede al pulido de los dientes mediante una fresa especial que elimina la placa bacteriana y devuelve a los dientes el aspecto sano que deben tener.

Una vez terminado todo el proceso, se mantiene al perro en observación hasta que se despierta de la anestesia, bajo la atenta supervisión de un veterinario.

¿Cada cuánto tiempo tengo que hacerle una limpieza dental a mi perro?

A partir de cierta edad, los perros pueden necesitar una limpieza dental anual o bianual. Depende de cada caso. En líneas generales, puede decirse que los perros de razas pequeñas suelen acumular más sarro y suelen necesitar una atención mayor en cuanto a higiene dental.


Riesgos de una mala higiene


Los riesgos más evidentes de una mala higiene dental en los perros son los siguientes:

  • Cuando la acumulación de sarro no se trata, se puede producir una inflamación y retracción de las encías que puede descalzar el diente y provocar caídas.
  • Mal aliento (halitosis).
  • Sarro perros
  • Puede ir a más
  • Las bacterias de la placa pueden trasladarse a través del torrente circulatorio a órganos vitales como el corazón ocasionando problemas de endocarditis en las válvulas. Las bacterias pueden incluso acantonarse en huesos (La osteomielitis es la infección ósea, tanto cortical como medular) provocando mucho dolor y una artritis séptica).

¿Cómo se forma el sarro?

El sarro es la calcificación de la placa dental. Los restos de alimentos, junto con las bacterias presentes en la boca, van a formar la placa bacteriana o placa dental. Si la placa no se retira, al mezclarse con la saliva y los minerales presentes en ella, reaccionará formando una costra. La placa se calcifica y se forma el sarro.

El sarro, cuando se forma, es de color blanquecino pero a medida que pasa el tiempo se va poniendo amarillo y luego marrón.

Síntomas de una pobre higiene dental
La señal más obvia de una mala salud dental canina es el mal aliento.

Sin embargo, a veces no es tan fácil de detectar
Y hay perros que no se dejan abrir la boca por su dueño. Por ejemplo…

Recientemente nos trajeron a la clínica a un perro que parpadeaba de un ojo y decía su dueño que le picaba un lado de la cara. Tenía molestias y dificultad para comer, lo que había llevado a sus dueños a comprarle comida blanda (que suele ser un poco más cara y llevar más contenido en grasa) durante medio año. Después de una exploración oftalmológica, nos dimos cuenta de que el ojo tenía una úlcera en la córnea probablemente de rascarse . Además, el canto lateral del ojo estaba inflamado. Tenía lo que en humanos llamamos flemón pero como era un perro de pelo largo, no se le notaba a simple vista. Al abrirle la boca nos llamó la atención el ver una muela llena de sarro. Le realizamos una radiografía y encontramos una fístula que llegaba hasta la parte inferior del ojo.

Le tuvimos que extraer la muela. Tras esto, el ojo se curó completamente con unos colirios y una lentilla protectora de úlcera. Afortunadamente, la úlcera no profundizó y no perforó el ojo. Ahora el perro come perfectamente a pesar de haber perdido una muela.

¿Cómo mantener la higiene dental de tu perro?
Hay varias maneras de prevenir problemas derivados de la salud dental de tu perro.

Limpiezas de dientes en casa
Es recomendable limpiar los dientes de tu perro semanal o diariamente si se puede. Existe una gran variedad de productos que se pueden utilizar:

Pastas de dientes.
Cepillos de dientes o dedales para el dedo índice, que hacen más fácil la limpieza.
Colutorios para echar en agua de bebida o directamente sobre el diente en líquido o en spray.

En la Clínica Tus Veterinarios enseñamos a nuestros clientes a tomar el hábito de limpiar los dientes de sus perros desde que son cachorros. Esto responde a nuestro compromiso con la prevención de enfermedades caninas.

Hoy en día tenemos muchos clientes que limpian los dientes todos los días a su mascota, y como resultado, se ahorran el dinero de hacer limpiezas dentales profesionales y consiguen una mejor salud de su perro.


Limpiezas dentales profesionales de perros y gatos

Recomendamos hacer una limpieza dental especializada anualmente. La realizamos con un aparato de ultrasonidos que utiliza agua para quitar el sarro. Después, procedemos a pulir los dientes con un cepillo de alta velocidad y una pasta especial. Hacemos esto para proteger el esmalte.

La frecuencia de limpiezas dentales necesaria varía mucho entre razas. En general, las razas grandes tienen buena calidad de esmalte, por lo que no necesitan hacerlo tan a menudo e incluso pueden pasarse la vida sin requerir una limpieza. Sin embargo, razas pequeñas como el Yorkshire o el Maltés, deben hacérselas todos los años desde cachorros si se quiere conservar sus piezas dentales.

Otro factor fundamental es la calidad del pienso. Algunas marcas han diseñado croquetas que limpian la superficie del diente y de la muela al masticarse.

Ultrasonido para perros

¿Se necesita anestesia para las limpiezas dentales de perros y gatos?

La limpieza dental en perros no es una técnica que pueda practicarse sin anestesia general , aunque hay veces que los propietarios no quieren anestesiar y si tiene poco sarro y el perro es muy bueno se puede intentar…… , pero no se va a poder pulir ni acceder a todas la zona de la boca …. Además los limpiadores dentales van a irrigar agua y hay riesgo de aspiración a vías respiratorias si no se realiza una anestesia correcta con intubación traqueal . En resumen , sin anestesia no se va hacer una correcta limpieza dental.

Tampoco sirve la sedación ya que necesitamos que el animal esté totalmente quieto, y el veterinario tenga un acceso completo a todas sus piezas dentales y encías.

Alimentos para la limpieza dental

Hay que tener cierto cuidado a la hora de comprar determinados alimentos porque no todos son saludables. Algunos tienen demasiado contenido graso, que en exceso puede causar problemas cardiovasculares y obesidad.

Los mejores alimentos para los dientes son aquellos que están elaborados por empresas farmacéuticas y llevan componentes químicos con tratamientos específicos para el diente del perro. Esto implica no solo limpieza a través de la acción mecánica de morder sino también un tratamiento antibacteriano para prevenir el sarro.

Conclusión

Si eres como la mayoría de dueños, por falta de tiempo , es probable que no estés prestando la suficiente atención a la limpieza dental de tu perro. Por eso te animamos a que comiences a limpiar los dientes de tu perro y consideres atender a su higiene bucal con frecuencia.

Estas simples medidas pueden conllevar a que tu perro tenga una vida más larga y mucho más saludable.

Si te resulta imposible introducir un cepillo de dientes a tu perro en la boca, pásate con él por clínica Tus Veterinarios y te explicamos cómo hacerlo.

Necesitas hacer una limpieza dental profesional a tu mascota?
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