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-rw-r--r--include/linux/hugetlb.h1214
1 files changed, 1214 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
new file mode 100644
index 000000000..1c6f35ba1
--- /dev/null
+++ b/include/linux/hugetlb.h
@@ -0,0 +1,1214 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_HUGETLB_H
+#define _LINUX_HUGETLB_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
+
+#ifdef CONFIG_HUGETLB_PAGE
+
+#include <linux/mempolicy.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. In order to avoid conflicts caused by
+ * subsequent use of more tail struct pages, we gather these discrete indexes
+ * of tail struct page here.
+ */
+enum {
+ SUBPAGE_INDEX_SUBPOOL = 1, /* reuse page->private */
+#ifdef CONFIG_CGROUP_HUGETLB
+ SUBPAGE_INDEX_CGROUP, /* reuse page->private */
+ SUBPAGE_INDEX_CGROUP_RSVD, /* reuse page->private */
+ __MAX_CGROUP_SUBPAGE_INDEX = SUBPAGE_INDEX_CGROUP_RSVD,
+#endif
+#ifdef CONFIG_MEMORY_FAILURE
+ SUBPAGE_INDEX_HWPOISON,
+#endif
+ __NR_USED_SUBPAGE,
+};
+
+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 hugetlb_sysctl_handler(struct ctl_table *, int, void *, size_t *, loff_t *);
+int hugetlb_overcommit_handler(struct ctl_table *, int, void *, size_t *,
+ loff_t *);
+int hugetlb_treat_movable_handler(struct ctl_table *, int, void *, size_t *,
+ loff_t *);
+int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, void *, size_t *,
+ loff_t *);
+
+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 *);
+long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
+ struct page **, struct vm_area_struct **,
+ unsigned long *, unsigned long *, long, unsigned int,
+ int *);
+void unmap_hugepage_range(struct vm_area_struct *,
+ unsigned long, unsigned long, struct page *,
+ zap_flags_t);
+void __unmap_hugepage_range_final(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_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
+ struct vm_area_struct *dst_vma,
+ unsigned long dst_addr,
+ unsigned long src_addr,
+ enum mcopy_atomic_mode mode,
+ struct page **pagep,
+ bool wp_copy);
+#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);
+int isolate_hugetlb(struct page *page, struct list_head *list);
+int get_hwpoison_huge_page(struct page *page, bool *hugetlb);
+int get_huge_page_for_hwpoison(unsigned long pfn, int flags);
+void putback_active_hugepage(struct page *page);
+void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
+void free_huge_page(struct page *page);
+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 */
+
+pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long addr, unsigned long sz);
+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);
+struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
+ int write);
+struct page *follow_huge_pd(struct vm_area_struct *vma,
+ unsigned long address, hugepd_t hpd,
+ int flags, int pdshift);
+struct page *follow_huge_pmd_pte(struct vm_area_struct *vma, unsigned long address,
+ int flags);
+struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
+ pud_t *pud, int flags);
+struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
+ pgd_t *pgd, int flags);
+
+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);
+unsigned 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);
+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 long follow_hugetlb_page(struct mm_struct *mm,
+ struct vm_area_struct *vma, struct page **pages,
+ struct vm_area_struct **vmas, unsigned long *position,
+ unsigned long *nr_pages, long i, unsigned int flags,
+ int *nonblocking)
+{
+ BUG();
+ return 0;
+}
+
+static inline struct page *follow_huge_addr(struct mm_struct *mm,
+ unsigned long address, int write)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+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 struct page *follow_huge_pd(struct vm_area_struct *vma,
+ unsigned long address, hugepd_t hpd, int flags,
+ int pdshift)
+{
+ return NULL;
+}
+
+static inline struct page *follow_huge_pmd_pte(struct vm_area_struct *vma,
+ unsigned long address, int flags)
+{
+ return NULL;
+}
+
+static inline struct page *follow_huge_pud(struct mm_struct *mm,
+ unsigned long address, pud_t *pud, int flags)
+{
+ return NULL;
+}
+
+static inline struct page *follow_huge_pgd(struct mm_struct *mm,
+ unsigned long address, pgd_t *pgd, int flags)
+{
+ return NULL;
+}
+
+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_mcopy_atomic_pte(struct mm_struct *dst_mm,
+ pte_t *dst_pte,
+ struct vm_area_struct *dst_vma,
+ unsigned long dst_addr,
+ unsigned long src_addr,
+ enum mcopy_atomic_mode mode,
+ struct page **pagep,
+ bool wp_copy)
+{
+ 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 int isolate_hugetlb(struct page *page, struct list_head *list)
+{
+ return -EBUSY;
+}
+
+static inline int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
+{
+ return 0;
+}
+
+static inline int get_huge_page_for_hwpoison(unsigned long pfn, int flags)
+{
+ return 0;
+}
+
+static inline void putback_active_hugepage(struct page *page)
+{
+}
+
+static inline void move_hugetlb_state(struct page *oldpage,
+ struct page *newpage, int reason)
+{
+}
+
+static inline unsigned 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_final(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 shared_policy policy;
+ 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 inline int HPage##uname(struct page *page) \
+ { return test_bit(HPG_##flname, &(page->private)); }
+
+#define SETHPAGEFLAG(uname, flname) \
+static inline void SetHPage##uname(struct page *page) \
+ { set_bit(HPG_##flname, &(page->private)); }
+
+#define CLEARHPAGEFLAG(uname, flname) \
+static inline void ClearHPage##uname(struct page *page) \
+ { clear_bit(HPG_##flname, &(page->private)); }
+#else
+#define TESTHPAGEFLAG(uname, flname) \
+static inline int HPage##uname(struct page *page) \
+ { return 0; }
+
+#define SETHPAGEFLAG(uname, flname) \
+static inline void SetHPage##uname(struct page *page) \
+ { }
+
+#define CLEARHPAGEFLAG(uname, flname) \
+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;
+ 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 page *alloc_huge_page(struct vm_area_struct *vma,
+ unsigned long addr, int avoid_reserve);
+struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
+ nodemask_t *nmask, gfp_t gfp_mask);
+struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
+ unsigned long address);
+int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
+ pgoff_t idx);
+void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
+ unsigned long address, struct page *page);
+
+/* 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])
+
+/*
+ * hugetlb page subpool pointer located in hpage[1].private
+ */
+static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
+{
+ return (void *)page_private(hpage + SUBPAGE_INDEX_SUBPOOL);
+}
+
+static inline void hugetlb_set_page_subpool(struct page *hpage,
+ struct hugepage_subpool *subpool)
+{
+ set_page_private(hpage + SUBPAGE_INDEX_SUBPOOL, (unsigned long)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_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;
+}
+
+#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 *page_hstate(struct page *page)
+{
+ VM_BUG_ON_PAGE(!PageHuge(page), page);
+ return size_to_hstate(page_size(page));
+}
+
+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 hugetlb_clear_page_hwpoison(struct page *hpage);
+#else
+static inline void hugetlb_clear_page_hwpoison(struct page *hpage)
+{
+}
+#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);
+}
+
+bool __vma_private_lock(struct vm_area_struct *vma);
+
+/*
+ * 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)
+{
+ set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
+}
+#endif
+
+#ifdef CONFIG_NUMA
+void hugetlb_register_node(struct node *node);
+void hugetlb_unregister_node(struct node *node);
+#endif
+
+#else /* CONFIG_HUGETLB_PAGE */
+struct hstate {};
+
+static inline struct hugepage_subpool *hugetlb_page_subpool(struct page *hpage)
+{
+ return NULL;
+}
+
+static inline int isolate_or_dissolve_huge_page(struct page *page,
+ struct list_head *list)
+{
+ return -ENOMEM;
+}
+
+static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
+ unsigned long addr,
+ int avoid_reserve)
+{
+ return NULL;
+}
+
+static inline struct page *
+alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
+ nodemask_t *nmask, gfp_t gfp_mask)
+{
+ return NULL;
+}
+
+static inline struct page *alloc_huge_page_vma(struct hstate *h,
+ struct vm_area_struct *vma,
+ unsigned long address)
+{
+ 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 *page_hstate(struct page *page)
+{
+ 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)
+{
+ return *ptep;
+}
+
+static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte)
+{
+}
+
+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
+
+#endif /* _LINUX_HUGETLB_H */