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 vm_fault_t 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 move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
 123 void free_huge_page(struct page *page);
 124 void hugetlb_fix_reserve_counts(struct inode *inode);
 125 extern struct mutex *hugetlb_fault_mutex_table;
 126 u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm,
 127                                 struct vm_area_struct *vma,
 128                                 struct address_space *mapping,
 129                                 pgoff_t idx, unsigned long address);
 130
 131 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
 132
 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
 164 #else /* !CONFIG_HUGETLB_PAGE */
 165
 166 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 167 {
 168 }
 169
 170 static inline unsigned long hugetlb_total_pages(void)
 171 {
 172         return 0;
 173 }
 174
 175 static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
 176                                         pte_t *ptep)
 177 {
 178         return 0;
 179 }
 180
 181 static inline void adjust_range_if_pmd_sharing_possible(
 182                                 struct vm_area_struct *vma,
 183                                 unsigned long *start, unsigned long *end)
 184 {
 185 }
 186
 187 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
 188 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 189 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 190 static inline void hugetlb_report_meminfo(struct seq_file *m)
 191 {
 192 }
 193 #define hugetlb_report_node_meminfo(n, buf)     0
 194 static inline void hugetlb_show_meminfo(void)
 195 {
 196 }
 197 #define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
 198 #define follow_huge_pmd(mm, addr, pmd, flags)   NULL
 199 #define follow_huge_pud(mm, addr, pud, flags)   NULL
 200 #define follow_huge_pgd(mm, addr, pgd, flags)   NULL
 201 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 202 #define pmd_huge(x)     0
 203 #define pud_huge(x)     0
 204 #define is_hugepage_only_range(mm, addr, len)   0
 205 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 206 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 207 #define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
 208                                 src_addr, pagep)        ({ BUG(); 0; })
 209 #define huge_pte_offset(mm, address, sz)        0
 210
 211 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
 212 {
 213         return false;
 214 }
 215 #define putback_active_hugepage(p)      do {} while (0)
 216 #define move_hugetlb_state(old, new, reason)    do {} while (0)
 217
 218 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 219                 unsigned long address, unsigned long end, pgprot_t newprot)
 220 {
 221         return 0;
 222 }
 223
 224 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 225                         struct vm_area_struct *vma, unsigned long start,
 226                         unsigned long end, struct page *ref_page)
 227 {
 228         BUG();
 229 }
 230
 231 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 232                         struct vm_area_struct *vma, unsigned long start,
 233                         unsigned long end, struct page *ref_page)
 234 {
 235         BUG();
 236 }
 237
 238 #endif /* !CONFIG_HUGETLB_PAGE */
 239 /*
 240  * hugepages at page global directory. If arch support
 241  * hugepages at pgd level, they need to define this.
 242  */
 243 #ifndef pgd_huge
 244 #define pgd_huge(x)     0
 245 #endif
 246 #ifndef p4d_huge
 247 #define p4d_huge(x)     0
 248 #endif
 249
 250 #ifndef pgd_write
 251 static inline int pgd_write(pgd_t pgd)
 252 {
 253         BUG();
 254         return 0;
 255 }
 256 #endif
 257
 258 #define HUGETLB_ANON_FILE "anon_hugepage"
 259
 260 enum {
 261         /*
 262          * The file will be used as an shm file so shmfs accounting rules
 263          * apply
 264          */
 265         HUGETLB_SHMFS_INODE     = 1,
 266         /*
 267          * The file is being created on the internal vfs mount and shmfs
 268          * accounting rules do not apply
 269          */
 270         HUGETLB_ANONHUGE_INODE  = 2,
 271 };
 272
 273 #ifdef CONFIG_HUGETLBFS
 274 struct hugetlbfs_sb_info {
 275         long    max_inodes;   /* inodes allowed */
 276         long    free_inodes;  /* inodes free */
 277         spinlock_t      stat_lock;
 278         struct hstate *hstate;
 279         struct hugepage_subpool *spool;
 280         kuid_t  uid;
 281         kgid_t  gid;
 282         umode_t mode;
 283 };
 284
 285 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 286 {
 287         return sb->s_fs_info;
 288 }
 289
 290 struct hugetlbfs_inode_info {
 291         struct shared_policy policy;
 292         struct inode vfs_inode;
 293         unsigned int seals;
 294 };
 295
 296 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 297 {
 298         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 299 }
 300
 301 extern const struct file_operations hugetlbfs_file_operations;
 302 extern const struct vm_operations_struct hugetlb_vm_ops;
 303 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 304                                 struct user_struct **user, int creat_flags,
 305                                 int page_size_log);
 306
 307 static inline bool is_file_hugepages(struct file *file)
 308 {
 309         if (file->f_op == &hugetlbfs_file_operations)
 310                 return true;
 311
 312         return is_file_shm_hugepages(file);
 313 }
 314
 315
 316 #else /* !CONFIG_HUGETLBFS */
 317
 318 #define is_file_hugepages(file)                 false
 319 static inline struct file *
 320 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
 321                 struct user_struct **user, int creat_flags,
 322                 int page_size_log)
 323 {
 324         return ERR_PTR(-ENOSYS);
 325 }
 326
 327 #endif /* !CONFIG_HUGETLBFS */
 328
 329 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 330 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 331                                         unsigned long len, unsigned long pgoff,
 332                                         unsigned long flags);
 333 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 334
 335 #ifdef CONFIG_HUGETLB_PAGE
 336
 337 #define HSTATE_NAME_LEN 32
 338 /* Defines one hugetlb page size */
 339 struct hstate {
 340         int next_nid_to_alloc;
 341         int next_nid_to_free;
 342         unsigned int order;
 343         unsigned long mask;
 344         unsigned long max_huge_pages;
 345         unsigned long nr_huge_pages;
 346         unsigned long free_huge_pages;
 347         unsigned long resv_huge_pages;
 348         unsigned long surplus_huge_pages;
 349         unsigned long nr_overcommit_huge_pages;
 350         struct list_head hugepage_activelist;
 351         struct list_head hugepage_freelists[MAX_NUMNODES];
 352         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 353         unsigned int free_huge_pages_node[MAX_NUMNODES];
 354         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 355 #ifdef CONFIG_CGROUP_HUGETLB
 356         /* cgroup control files */
 357         struct cftype cgroup_files[5];
 358 #endif
 359         char name[HSTATE_NAME_LEN];
 360 };
 361
 362 struct huge_bootmem_page {
 363         struct list_head list;
 364         struct hstate *hstate;
 365 };
 366
 367 struct page *alloc_huge_page(struct vm_area_struct *vma,
 368                                 unsigned long addr, int avoid_reserve);
 369 struct page *alloc_huge_page_node(struct hstate *h, int nid);
 370 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
 371                                 nodemask_t *nmask);
 372 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
 373                                 unsigned long address);
 374 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
 375                         pgoff_t idx);
 376
 377 /* arch callback */
 378 int __init __alloc_bootmem_huge_page(struct hstate *h);
 379 int __init alloc_bootmem_huge_page(struct hstate *h);
 380
 381 void __init hugetlb_bad_size(void);
 382 void __init hugetlb_add_hstate(unsigned order);
 383 struct hstate *size_to_hstate(unsigned long size);
 384
 385 #ifndef HUGE_MAX_HSTATE
 386 #define HUGE_MAX_HSTATE 1
 387 #endif
 388
 389 extern struct hstate hstates[HUGE_MAX_HSTATE];
 390 extern unsigned int default_hstate_idx;
 391
 392 #define default_hstate (hstates[default_hstate_idx])
 393
 394 static inline struct hstate *hstate_inode(struct inode *i)
 395 {
 396         return HUGETLBFS_SB(i->i_sb)->hstate;
 397 }
 398
 399 static inline struct hstate *hstate_file(struct file *f)
 400 {
 401         return hstate_inode(file_inode(f));
 402 }
 403
 404 static inline struct hstate *hstate_sizelog(int page_size_log)
 405 {
 406         if (!page_size_log)
 407                 return &default_hstate;
 408
 409         return size_to_hstate(1UL << page_size_log);
 410 }
 411
 412 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 413 {
 414         return hstate_file(vma->vm_file);
 415 }
 416
 417 static inline unsigned long huge_page_size(struct hstate *h)
 418 {
 419         return (unsigned long)PAGE_SIZE << h->order;
 420 }
 421
 422 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 423
 424 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 425
 426 static inline unsigned long huge_page_mask(struct hstate *h)
 427 {
 428         return h->mask;
 429 }
 430
 431 static inline unsigned int huge_page_order(struct hstate *h)
 432 {
 433         return h->order;
 434 }
 435
 436 static inline unsigned huge_page_shift(struct hstate *h)
 437 {
 438         return h->order + PAGE_SHIFT;
 439 }
 440
 441 static inline bool hstate_is_gigantic(struct hstate *h)
 442 {
 443         return huge_page_order(h) >= MAX_ORDER;
 444 }
 445
 446 static inline unsigned int pages_per_huge_page(struct hstate *h)
 447 {
 448         return 1 << h->order;
 449 }
 450
 451 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 452 {
 453         return huge_page_size(h) / 512;
 454 }
 455
 456 #include <asm/hugetlb.h>
 457
 458 #ifndef arch_make_huge_pte
 459 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 460                                        struct page *page, int writable)
 461 {
 462         return entry;
 463 }
 464 #endif
 465
 466 static inline struct hstate *page_hstate(struct page *page)
 467 {
 468         VM_BUG_ON_PAGE(!PageHuge(page), page);
 469         return size_to_hstate(PAGE_SIZE << compound_order(page));
 470 }
 471
 472 static inline unsigned hstate_index_to_shift(unsigned index)
 473 {
 474         return hstates[index].order + PAGE_SHIFT;
 475 }
 476
 477 static inline int hstate_index(struct hstate *h)
 478 {
 479         return h - hstates;
 480 }
 481
 482 pgoff_t __basepage_index(struct page *page);
 483
 484 /* Return page->index in PAGE_SIZE units */
 485 static inline pgoff_t basepage_index(struct page *page)
 486 {
 487         if (!PageCompound(page))
 488                 return page->index;
 489
 490         return __basepage_index(page);
 491 }
 492
 493 extern int dissolve_free_huge_page(struct page *page);
 494 extern int dissolve_free_huge_pages(unsigned long start_pfn,
 495                                     unsigned long end_pfn);
 496 static inline bool hugepage_migration_supported(struct hstate *h)
 497 {
 498 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
 499         if ((huge_page_shift(h) == PMD_SHIFT) ||
 500                 (huge_page_shift(h) == PGDIR_SHIFT))
 501                 return true;
 502         else
 503                 return false;
 504 #else
 505         return false;
 506 #endif
 507 }
 508
 509 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 510                                            struct mm_struct *mm, pte_t *pte)
 511 {
 512         if (huge_page_size(h) == PMD_SIZE)
 513                 return pmd_lockptr(mm, (pmd_t *) pte);
 514         VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
 515         return &mm->page_table_lock;
 516 }
 517
 518 #ifndef hugepages_supported
 519 /*
 520  * Some platform decide whether they support huge pages at boot
 521  * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
 522  * when there is no such support
 523  */
 524 #define hugepages_supported() (HPAGE_SHIFT != 0)
 525 #endif
 526
 527 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
 528
 529 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
 530 {
 531         atomic_long_add(l, &mm->hugetlb_usage);
 532 }
 533
 534 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
 535 {
 536         atomic_long_sub(l, &mm->hugetlb_usage);
 537 }
 538
 539 #ifndef set_huge_swap_pte_at
 540 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
 541                                         pte_t *ptep, pte_t pte, unsigned long sz)
 542 {
 543         set_huge_pte_at(mm, addr, ptep, pte);
 544 }
 545 #endif
 546 #else   /* CONFIG_HUGETLB_PAGE */
 547 struct hstate {};
 548 #define alloc_huge_page(v, a, r) NULL
 549 #define alloc_huge_page_node(h, nid) NULL
 550 #define alloc_huge_page_nodemask(h, preferred_nid, nmask) NULL
 551 #define alloc_huge_page_vma(h, vma, address) NULL
 552 #define alloc_bootmem_huge_page(h) NULL
 553 #define hstate_file(f) NULL
 554 #define hstate_sizelog(s) NULL
 555 #define hstate_vma(v) NULL
 556 #define hstate_inode(i) NULL
 557 #define page_hstate(page) NULL
 558 #define huge_page_size(h) PAGE_SIZE
 559 #define huge_page_mask(h) PAGE_MASK
 560 #define vma_kernel_pagesize(v) PAGE_SIZE
 561 #define vma_mmu_pagesize(v) PAGE_SIZE
 562 #define huge_page_order(h) 0
 563 #define huge_page_shift(h) PAGE_SHIFT
 564 static inline bool hstate_is_gigantic(struct hstate *h)
 565 {
 566         return false;
 567 }
 568
 569 static inline unsigned int pages_per_huge_page(struct hstate *h)
 570 {
 571         return 1;
 572 }
 573
 574 static inline unsigned hstate_index_to_shift(unsigned index)
 575 {
 576         return 0;
 577 }
 578
 579 static inline int hstate_index(struct hstate *h)
 580 {
 581         return 0;
 582 }
 583
 584 static inline pgoff_t basepage_index(struct page *page)
 585 {
 586         return page->index;
 587 }
 588
 589 static inline int dissolve_free_huge_page(struct page *page)
 590 {
 591         return 0;
 592 }
 593
 594 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
 595                                            unsigned long end_pfn)
 596 {
 597         return 0;
 598 }
 599
 600 static inline bool hugepage_migration_supported(struct hstate *h)
 601 {
 602         return false;
 603 }
 604
 605 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 606                                            struct mm_struct *mm, pte_t *pte)
 607 {
 608         return &mm->page_table_lock;
 609 }
 610
 611 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
 612 {
 613 }
 614
 615 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
 616 {
 617 }
 618
 619 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
 620                                         pte_t *ptep, pte_t pte, unsigned long sz)
 621 {
 622 }
 623 #endif  /* CONFIG_HUGETLB_PAGE */
 624
 625 static inline spinlock_t *huge_pte_lock(struct hstate *h,
 626                                         struct mm_struct *mm, pte_t *pte)
 627 {
 628         spinlock_t *ptl;
 629
 630         ptl = huge_pte_lockptr(h, mm, pte);
 631         spin_lock(ptl);
 632         return ptl;
 633 }
 634
 635 #endif /* _LINUX_HUGETLB_H */