include/linux/hugetlb.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_HUGETLB_H
   3 #define _LINUX_HUGETLB_H
   4
   5 #include <linux/mm_types.h>
   6 #include <linux/mmdebug.h>
   7 #include <linux/fs.h>
   8 #include <linux/hugetlb_inline.h>
   9 #include <linux/cgroup.h>
  10 #include <linux/list.h>
  11 #include <linux/kref.h>
  12 #include <asm/pgtable.h>
  13
  14 struct ctl_table;
  15 struct user_struct;
  16 struct mmu_gather;
  17
  18 #ifndef is_hugepd
  19 /*
  20  * Some architectures requires a hugepage directory format that is
  21  * required to support multiple hugepage sizes. For example
  22  * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables"
  23  * introduced the same on powerpc. This allows for a more flexible hugepage
  24  * pagetable layout.
  25  */
  26 typedef struct { unsigned long pd; } hugepd_t;
  27 #define is_hugepd(hugepd) (0)
  28 #define __hugepd(x) ((hugepd_t) { (x) })
  29 static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
  30                               unsigned pdshift, unsigned long end,
  31                               int write, struct page **pages, int *nr)
  32 {
  33         return 0;
  34 }
  35 #else
  36 extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr,
  37                        unsigned pdshift, unsigned long end,
  38                        int write, struct page **pages, int *nr);
  39 #endif
  40
  41
  42 #ifdef CONFIG_HUGETLB_PAGE
  43
  44 #include <linux/mempolicy.h>
  45 #include <linux/shm.h>
  46 #include <asm/tlbflush.h>
  47
  48 struct hugepage_subpool {
  49         spinlock_t lock;
  50         long count;
  51         long max_hpages;        /* Maximum huge pages or -1 if no maximum. */
  52         long used_hpages;       /* Used count against maximum, includes */
  53                                 /* both alloced and reserved pages. */
  54         struct hstate *hstate;
  55         long min_hpages;        /* Minimum huge pages or -1 if no minimum. */
  56         long rsv_hpages;        /* Pages reserved against global pool to */
  57                                 /* sasitfy minimum size. */
  58 };
  59
  60 struct resv_map {
  61         struct kref refs;
  62         spinlock_t lock;
  63         struct list_head regions;
  64         long adds_in_progress;
  65         struct list_head region_cache;
  66         long region_cache_count;
  67 };
  68 extern struct resv_map *resv_map_alloc(void);
  69 void resv_map_release(struct kref *ref);
  70
  71 extern spinlock_t hugetlb_lock;
  72 extern int hugetlb_max_hstate __read_mostly;
  73 #define for_each_hstate(h) \
  74         for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
  75
  76 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
  77                                                 long min_hpages);
  78 void hugepage_put_subpool(struct hugepage_subpool *spool);
  79
  80 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  81 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  82 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  83 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  84
  85 #ifdef CONFIG_NUMA
  86 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  87                                         void __user *, size_t *, loff_t *);
  88 #endif
  89
  90 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  91 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  92                          struct page **, struct vm_area_struct **,
  93                          unsigned long *, unsigned long *, long, unsigned int,
  94                          int *);
  95 void unmap_hugepage_range(struct vm_area_struct *,
  96                           unsigned long, unsigned long, struct page *);
  97 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
  98                           struct vm_area_struct *vma,
  99                           unsigned long start, unsigned long end,
 100                           struct page *ref_page);
 101 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
 102                                 unsigned long start, unsigned long end,
 103                                 struct page *ref_page);
 104 void hugetlb_report_meminfo(struct seq_file *);
 105 int hugetlb_report_node_meminfo(int, char *);
 106 void hugetlb_show_meminfo(void);
 107 unsigned long hugetlb_total_pages(void);
 108 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 109                         unsigned long address, unsigned int flags);
 110 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
 111                                 struct vm_area_struct *dst_vma,
 112                                 unsigned long dst_addr,
 113                                 unsigned long src_addr,
 114                                 struct page **pagep);
 115 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
 116                                                 struct vm_area_struct *vma,
 117                                                 vm_flags_t vm_flags);
 118 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
 119                                                 long freed);
 120 bool isolate_huge_page(struct page *page, struct list_head *list);
 121 void putback_active_hugepage(struct page *page);
 122 void free_huge_page(struct page *page);
 123 void hugetlb_fix_reserve_counts(struct inode *inode);
 124 extern struct mutex *hugetlb_fault_mutex_table;
 125 u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
 126                                 struct vm_area_struct *vma,
 127                                 struct address_space *mapping,
 128                                 pgoff_t idx, unsigned long address);
 129
 130 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
 131
 132 extern int hugepages_treat_as_movable;
 133 extern int sysctl_hugetlb_shm_group;
 134 extern struct list_head huge_boot_pages;
 135
 136 /* arch callbacks */
 137
 138 pte_t *huge_pte_alloc(struct mm_struct *mm,
 139                         unsigned long addr, unsigned long sz);
 140 pte_t *huge_pte_offset(struct mm_struct *mm,
 141                        unsigned long addr, unsigned long sz);
 142 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
 143 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
 144                                 unsigned long *start, unsigned long *end);
 145 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
 146                               int write);
 147 struct page *follow_huge_pd(struct vm_area_struct *vma,
 148                             unsigned long address, hugepd_t hpd,
 149                             int flags, int pdshift);
 150 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
 151                                 pmd_t *pmd, int flags);
 152 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
 153                                 pud_t *pud, int flags);
 154 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
 155                              pgd_t *pgd, int flags);
 156
 157 int pmd_huge(pmd_t pmd);
 158 int pud_huge(pud_t pud);
 159 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 160                 unsigned long address, unsigned long end, pgprot_t newprot);
 161
 162 bool is_hugetlb_entry_migration(pte_t pte);
 163 #else /* !CONFIG_HUGETLB_PAGE */
 164
 165 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 166 {
 167 }
 168
 169 static inline unsigned long hugetlb_total_pages(void)
 170 {
 171         return 0;
 172 }
 173
 174 static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
 175                                         pte_t *ptep)
 176 {
 177         return 0;
 178 }
 179
 180 static inline void adjust_range_if_pmd_sharing_possible(
 181                                 struct vm_area_struct *vma,
 182                                 unsigned long *start, unsigned long *end)
 183 {
 184 }
 185
 186 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
 187 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 188 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 189 static inline void hugetlb_report_meminfo(struct seq_file *m)
 190 {
 191 }
 192 #define hugetlb_report_node_meminfo(n, buf)     0
 193 static inline void hugetlb_show_meminfo(void)
 194 {
 195 }
 196 #define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
 197 #define follow_huge_pmd(mm, addr, pmd, flags)   NULL
 198 #define follow_huge_pud(mm, addr, pud, flags)   NULL
 199 #define follow_huge_pgd(mm, addr, pgd, flags)   NULL
 200 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 201 #define pmd_huge(x)     0
 202 #define pud_huge(x)     0
 203 #define is_hugepage_only_range(mm, addr, len)   0
 204 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 205 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 206 #define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
 207                                 src_addr, pagep)        ({ BUG(); 0; })
 208 #define huge_pte_offset(mm, address, sz)        0
 209
 210 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
 211 {
 212         return false;
 213 }
 214 #define putback_active_hugepage(p)      do {} while (0)
 215
 216 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 217                 unsigned long address, unsigned long end, pgprot_t newprot)
 218 {
 219         return 0;
 220 }
 221
 222 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 223                         struct vm_area_struct *vma, unsigned long start,
 224                         unsigned long end, struct page *ref_page)
 225 {
 226         BUG();
 227 }
 228
 229 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 230                         struct vm_area_struct *vma, unsigned long start,
 231                         unsigned long end, struct page *ref_page)
 232 {
 233         BUG();
 234 }
 235
 236 #endif /* !CONFIG_HUGETLB_PAGE */
 237 /*
 238  * hugepages at page global directory. If arch support
 239  * hugepages at pgd level, they need to define this.
 240  */
 241 #ifndef pgd_huge
 242 #define pgd_huge(x)     0
 243 #endif
 244 #ifndef p4d_huge
 245 #define p4d_huge(x)     0
 246 #endif
 247
 248 #ifndef pgd_write
 249 static inline int pgd_write(pgd_t pgd)
 250 {
 251         BUG();
 252         return 0;
 253 }
 254 #endif
 255
 256 #define HUGETLB_ANON_FILE "anon_hugepage"
 257
 258 enum {
 259         /*
 260          * The file will be used as an shm file so shmfs accounting rules
 261          * apply
 262          */
 263         HUGETLB_SHMFS_INODE     = 1,
 264         /*
 265          * The file is being created on the internal vfs mount and shmfs
 266          * accounting rules do not apply
 267          */
 268         HUGETLB_ANONHUGE_INODE  = 2,
 269 };
 270
 271 #ifdef CONFIG_HUGETLBFS
 272 struct hugetlbfs_sb_info {
 273         long    max_inodes;   /* inodes allowed */
 274         long    free_inodes;  /* inodes free */
 275         spinlock_t      stat_lock;
 276         struct hstate *hstate;
 277         struct hugepage_subpool *spool;
 278         kuid_t  uid;
 279         kgid_t  gid;
 280         umode_t mode;
 281 };
 282
 283 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 284 {
 285         return sb->s_fs_info;
 286 }
 287
 288 extern const struct file_operations hugetlbfs_file_operations;
 289 extern const struct vm_operations_struct hugetlb_vm_ops;
 290 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 291                                 struct user_struct **user, int creat_flags,
 292                                 int page_size_log);
 293
 294 static inline bool is_file_hugepages(struct file *file)
 295 {
 296         if (file->f_op == &hugetlbfs_file_operations)
 297                 return true;
 298
 299         return is_file_shm_hugepages(file);
 300 }
 301
 302
 303 #else /* !CONFIG_HUGETLBFS */
 304
 305 #define is_file_hugepages(file)                 false
 306 static inline struct file *
 307 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
 308                 struct user_struct **user, int creat_flags,
 309                 int page_size_log)
 310 {
 311         return ERR_PTR(-ENOSYS);
 312 }
 313
 314 #endif /* !CONFIG_HUGETLBFS */
 315
 316 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 317 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 318                                         unsigned long len, unsigned long pgoff,
 319                                         unsigned long flags);
 320 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 321
 322 #ifdef CONFIG_HUGETLB_PAGE
 323
 324 #define HSTATE_NAME_LEN 32
 325 /* Defines one hugetlb page size */
 326 struct hstate {
 327         int next_nid_to_alloc;
 328         int next_nid_to_free;
 329         unsigned int order;
 330         unsigned long mask;
 331         unsigned long max_huge_pages;
 332         unsigned long nr_huge_pages;
 333         unsigned long free_huge_pages;
 334         unsigned long resv_huge_pages;
 335         unsigned long surplus_huge_pages;
 336         unsigned long nr_overcommit_huge_pages;
 337         struct list_head hugepage_activelist;
 338         struct list_head hugepage_freelists[MAX_NUMNODES];
 339         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 340         unsigned int free_huge_pages_node[MAX_NUMNODES];
 341         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 342 #ifdef CONFIG_CGROUP_HUGETLB
 343         /* cgroup control files */
 344         struct cftype cgroup_files[5];
 345 #endif
 346         char name[HSTATE_NAME_LEN];
 347 };
 348
 349 struct huge_bootmem_page {
 350         struct list_head list;
 351         struct hstate *hstate;
 352 #ifdef CONFIG_HIGHMEM
 353         phys_addr_t phys;
 354 #endif
 355 };
 356
 357 struct page *alloc_huge_page(struct vm_area_struct *vma,
 358                                 unsigned long addr, int avoid_reserve);
 359 struct page *alloc_huge_page_node(struct hstate *h, int nid);
 360 struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
 361                                 unsigned long addr, int avoid_reserve);
 362 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
 363                                 nodemask_t *nmask);
 364 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
 365                         pgoff_t idx);
 366
 367 /* arch callback */
 368 int __init __alloc_bootmem_huge_page(struct hstate *h);
 369 int __init alloc_bootmem_huge_page(struct hstate *h);
 370
 371 void __init hugetlb_bad_size(void);
 372 void __init hugetlb_add_hstate(unsigned order);
 373 struct hstate *size_to_hstate(unsigned long size);
 374
 375 #ifndef HUGE_MAX_HSTATE
 376 #define HUGE_MAX_HSTATE 1
 377 #endif
 378
 379 extern struct hstate hstates[HUGE_MAX_HSTATE];
 380 extern unsigned int default_hstate_idx;
 381
 382 #define default_hstate (hstates[default_hstate_idx])
 383
 384 static inline struct hstate *hstate_inode(struct inode *i)
 385 {
 386         return HUGETLBFS_SB(i->i_sb)->hstate;
 387 }
 388
 389 static inline struct hstate *hstate_file(struct file *f)
 390 {
 391         return hstate_inode(file_inode(f));
 392 }
 393
 394 static inline struct hstate *hstate_sizelog(int page_size_log)
 395 {
 396         if (!page_size_log)
 397                 return &default_hstate;
 398
 399         return size_to_hstate(1UL << page_size_log);
 400 }
 401
 402 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 403 {
 404         return hstate_file(vma->vm_file);
 405 }
 406
 407 static inline unsigned long huge_page_size(struct hstate *h)
 408 {
 409         return (unsigned long)PAGE_SIZE << h->order;
 410 }
 411
 412 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 413
 414 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 415
 416 static inline unsigned long huge_page_mask(struct hstate *h)
 417 {
 418         return h->mask;
 419 }
 420
 421 static inline unsigned int huge_page_order(struct hstate *h)
 422 {
 423         return h->order;
 424 }
 425
 426 static inline unsigned huge_page_shift(struct hstate *h)
 427 {
 428         return h->order + PAGE_SHIFT;
 429 }
 430
 431 static inline bool hstate_is_gigantic(struct hstate *h)
 432 {
 433         return huge_page_order(h) >= MAX_ORDER;
 434 }
 435
 436 static inline unsigned int pages_per_huge_page(struct hstate *h)
 437 {
 438         return 1 << h->order;
 439 }
 440
 441 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 442 {
 443         return huge_page_size(h) / 512;
 444 }
 445
 446 #include <asm/hugetlb.h>
 447
 448 #ifndef arch_make_huge_pte
 449 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 450                                        struct page *page, int writable)
 451 {
 452         return entry;
 453 }
 454 #endif
 455
 456 static inline struct hstate *page_hstate(struct page *page)
 457 {
 458         VM_BUG_ON_PAGE(!PageHuge(page), page);
 459         return size_to_hstate(PAGE_SIZE << compound_order(page));
 460 }
 461
 462 static inline unsigned hstate_index_to_shift(unsigned index)
 463 {
 464         return hstates[index].order + PAGE_SHIFT;
 465 }
 466
 467 static inline int hstate_index(struct hstate *h)
 468 {
 469         return h - hstates;
 470 }
 471
 472 pgoff_t __basepage_index(struct page *page);
 473
 474 /* Return page->index in PAGE_SIZE units */
 475 static inline pgoff_t basepage_index(struct page *page)
 476 {
 477         if (!PageCompound(page))
 478                 return page->index;
 479
 480         return __basepage_index(page);
 481 }
 482
 483 extern int dissolve_free_huge_page(struct page *page);
 484 extern int dissolve_free_huge_pages(unsigned long start_pfn,
 485                                     unsigned long end_pfn);
 486 static inline bool hugepage_migration_supported(struct hstate *h)
 487 {
 488 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
 489         if ((huge_page_shift(h) == PMD_SHIFT) ||
 490                 (huge_page_shift(h) == PGDIR_SHIFT))
 491                 return true;
 492         else
 493                 return false;
 494 #else
 495         return false;
 496 #endif
 497 }
 498
 499 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 500                                            struct mm_struct *mm, pte_t *pte)
 501 {
 502         if (huge_page_size(h) == PMD_SIZE)
 503                 return pmd_lockptr(mm, (pmd_t *) pte);
 504         VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
 505         return &mm->page_table_lock;
 506 }
 507
 508 #ifndef hugepages_supported
 509 /*
 510  * Some platform decide whether they support huge pages at boot
 511  * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
 512  * when there is no such support
 513  */
 514 #define hugepages_supported() (HPAGE_SHIFT != 0)
 515 #endif
 516
 517 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
 518
 519 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
 520 {
 521         atomic_long_add(l, &mm->hugetlb_usage);
 522 }
 523
 524 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
 525 {
 526         atomic_long_sub(l, &mm->hugetlb_usage);
 527 }
 528
 529 #ifndef set_huge_swap_pte_at
 530 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
 531                                         pte_t *ptep, pte_t pte, unsigned long sz)
 532 {
 533         set_huge_pte_at(mm, addr, ptep, pte);
 534 }
 535 #endif
 536 #else   /* CONFIG_HUGETLB_PAGE */
 537 struct hstate {};
 538 #define alloc_huge_page(v, a, r) NULL
 539 #define alloc_huge_page_node(h, nid) NULL
 540 #define alloc_huge_page_nodemask(h, preferred_nid, nmask) NULL
 541 #define alloc_huge_page_noerr(v, a, r) NULL
 542 #define alloc_bootmem_huge_page(h) NULL
 543 #define hstate_file(f) NULL
 544 #define hstate_sizelog(s) NULL
 545 #define hstate_vma(v) NULL
 546 #define hstate_inode(i) NULL
 547 #define page_hstate(page) NULL
 548 #define huge_page_size(h) PAGE_SIZE
 549 #define huge_page_mask(h) PAGE_MASK
 550 #define vma_kernel_pagesize(v) PAGE_SIZE
 551 #define vma_mmu_pagesize(v) PAGE_SIZE
 552 #define huge_page_order(h) 0
 553 #define huge_page_shift(h) PAGE_SHIFT
 554 static inline bool hstate_is_gigantic(struct hstate *h)
 555 {
 556         return false;
 557 }
 558
 559 static inline unsigned int pages_per_huge_page(struct hstate *h)
 560 {
 561         return 1;
 562 }
 563
 564 static inline unsigned hstate_index_to_shift(unsigned index)
 565 {
 566         return 0;
 567 }
 568
 569 static inline int hstate_index(struct hstate *h)
 570 {
 571         return 0;
 572 }
 573
 574 static inline pgoff_t basepage_index(struct page *page)
 575 {
 576         return page->index;
 577 }
 578
 579 static inline int dissolve_free_huge_page(struct page *page)
 580 {
 581         return 0;
 582 }
 583
 584 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
 585                                            unsigned long end_pfn)
 586 {
 587         return 0;
 588 }
 589
 590 static inline bool hugepage_migration_supported(struct hstate *h)
 591 {
 592         return false;
 593 }
 594
 595 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 596                                            struct mm_struct *mm, pte_t *pte)
 597 {
 598         return &mm->page_table_lock;
 599 }
 600
 601 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
 602 {
 603 }
 604
 605 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
 606 {
 607 }
 608
 609 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
 610                                         pte_t *ptep, pte_t pte, unsigned long sz)
 611 {
 612 }
 613 #endif  /* CONFIG_HUGETLB_PAGE */
 614
 615 static inline spinlock_t *huge_pte_lock(struct hstate *h,
 616                                         struct mm_struct *mm, pte_t *pte)
 617 {
 618         spinlock_t *ptl;
 619
 620         ptl = huge_pte_lockptr(h, mm, pte);
 621         spin_lock(ptl);
 622         return ptl;
 623 }
 624
 625 #endif /* _LINUX_HUGETLB_H */