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 typedef struct { unsigned long pd; } hugepd_t; 20 #define is_hugepd(hugepd) (0) 21 #define __hugepd(x) ((hugepd_t) { (x) }) 22 #endif 23 24 #ifdef CONFIG_HUGETLB_PAGE 25 26 #include <linux/mempolicy.h> 27 #include <linux/shm.h> 28 #include <asm/tlbflush.h> 29 30 struct hugepage_subpool { 31 spinlock_t lock; 32 long count; 33 long max_hpages; /* Maximum huge pages or -1 if no maximum. */ 34 long used_hpages; /* Used count against maximum, includes */ 35 /* both alloced and reserved pages. */ 36 struct hstate *hstate; 37 long min_hpages; /* Minimum huge pages or -1 if no minimum. */ 38 long rsv_hpages; /* Pages reserved against global pool to */ 39 /* sasitfy minimum size. */ 40 }; 41 42 struct resv_map { 43 struct kref refs; 44 spinlock_t lock; 45 struct list_head regions; 46 long adds_in_progress; 47 struct list_head region_cache; 48 long region_cache_count; 49 }; 50 extern struct resv_map *resv_map_alloc(void); 51 void resv_map_release(struct kref *ref); 52 53 extern spinlock_t hugetlb_lock; 54 extern int hugetlb_max_hstate __read_mostly; 55 #define for_each_hstate(h) \ 56 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++) 57 58 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages, 59 long min_hpages); 60 void hugepage_put_subpool(struct hugepage_subpool *spool); 61 62 void reset_vma_resv_huge_pages(struct vm_area_struct *vma); 63 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 64 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 65 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); 66 67 #ifdef CONFIG_NUMA 68 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, 69 void __user *, size_t *, loff_t *); 70 #endif 71 72 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); 73 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, 74 struct page **, struct vm_area_struct **, 75 unsigned long *, unsigned long *, long, unsigned int, 76 int *); 77 void unmap_hugepage_range(struct vm_area_struct *, 78 unsigned long, unsigned long, struct page *); 79 void __unmap_hugepage_range_final(struct mmu_gather *tlb, 80 struct vm_area_struct *vma, 81 unsigned long start, unsigned long end, 82 struct page *ref_page); 83 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, 84 unsigned long start, unsigned long end, 85 struct page *ref_page); 86 void hugetlb_report_meminfo(struct seq_file *); 87 int hugetlb_report_node_meminfo(int, char *); 88 void hugetlb_show_meminfo(void); 89 unsigned long hugetlb_total_pages(void); 90 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, 91 unsigned long address, unsigned int flags); 92 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte, 93 struct vm_area_struct *dst_vma, 94 unsigned long dst_addr, 95 unsigned long src_addr, 96 struct page **pagep); 97 int hugetlb_reserve_pages(struct inode *inode, long from, long to, 98 struct vm_area_struct *vma, 99 vm_flags_t vm_flags); 100 long hugetlb_unreserve_pages(struct inode *inode, long start, long end, 101 long freed); 102 bool isolate_huge_page(struct page *page, struct list_head *list); 103 void putback_active_hugepage(struct page *page); 104 void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason); 105 void free_huge_page(struct page *page); 106 void hugetlb_fix_reserve_counts(struct inode *inode); 107 extern struct mutex *hugetlb_fault_mutex_table; 108 u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx); 109 110 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud); 111 112 extern int sysctl_hugetlb_shm_group; 113 extern struct list_head huge_boot_pages; 114 115 /* arch callbacks */ 116 117 pte_t *huge_pte_alloc(struct mm_struct *mm, 118 unsigned long addr, unsigned long sz); 119 pte_t *huge_pte_offset(struct mm_struct *mm, 120 unsigned long addr, unsigned long sz); 121 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep); 122 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma, 123 unsigned long *start, unsigned long *end); 124 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, 125 int write); 126 struct page *follow_huge_pd(struct vm_area_struct *vma, 127 unsigned long address, hugepd_t hpd, 128 int flags, int pdshift); 129 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, 130 pmd_t *pmd, int flags); 131 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address, 132 pud_t *pud, int flags); 133 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address, 134 pgd_t *pgd, int flags); 135 136 int pmd_huge(pmd_t pmd); 137 int pud_huge(pud_t pud); 138 unsigned long hugetlb_change_protection(struct vm_area_struct *vma, 139 unsigned long address, unsigned long end, pgprot_t newprot); 140 141 bool is_hugetlb_entry_migration(pte_t pte); 142 143 #else /* !CONFIG_HUGETLB_PAGE */ 144 145 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma) 146 { 147 } 148 149 static inline unsigned long hugetlb_total_pages(void) 150 { 151 return 0; 152 } 153 154 static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, 155 pte_t *ptep) 156 { 157 return 0; 158 } 159 160 static inline void adjust_range_if_pmd_sharing_possible( 161 struct vm_area_struct *vma, 162 unsigned long *start, unsigned long *end) 163 { 164 } 165 166 static inline long follow_hugetlb_page(struct mm_struct *mm, 167 struct vm_area_struct *vma, struct page **pages, 168 struct vm_area_struct **vmas, unsigned long *position, 169 unsigned long *nr_pages, long i, unsigned int flags, 170 int *nonblocking) 171 { 172 BUG(); 173 return 0; 174 } 175 176 static inline struct page *follow_huge_addr(struct mm_struct *mm, 177 unsigned long address, int write) 178 { 179 return ERR_PTR(-EINVAL); 180 } 181 182 static inline int copy_hugetlb_page_range(struct mm_struct *dst, 183 struct mm_struct *src, struct vm_area_struct *vma) 184 { 185 BUG(); 186 return 0; 187 } 188 189 static inline void hugetlb_report_meminfo(struct seq_file *m) 190 { 191 } 192 193 static inline int hugetlb_report_node_meminfo(int nid, char *buf) 194 { 195 return 0; 196 } 197 198 static inline void hugetlb_show_meminfo(void) 199 { 200 } 201 202 static inline struct page *follow_huge_pd(struct vm_area_struct *vma, 203 unsigned long address, hugepd_t hpd, int flags, 204 int pdshift) 205 { 206 return NULL; 207 } 208 209 static inline struct page *follow_huge_pmd(struct mm_struct *mm, 210 unsigned long address, pmd_t *pmd, int flags) 211 { 212 return NULL; 213 } 214 215 static inline struct page *follow_huge_pud(struct mm_struct *mm, 216 unsigned long address, pud_t *pud, int flags) 217 { 218 return NULL; 219 } 220 221 static inline struct page *follow_huge_pgd(struct mm_struct *mm, 222 unsigned long address, pgd_t *pgd, int flags) 223 { 224 return NULL; 225 } 226 227 static inline int prepare_hugepage_range(struct file *file, 228 unsigned long addr, unsigned long len) 229 { 230 return -EINVAL; 231 } 232 233 static inline int pmd_huge(pmd_t pmd) 234 { 235 return 0; 236 } 237 238 static inline int pud_huge(pud_t pud) 239 { 240 return 0; 241 } 242 243 static inline int is_hugepage_only_range(struct mm_struct *mm, 244 unsigned long addr, unsigned long len) 245 { 246 return 0; 247 } 248 249 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb, 250 unsigned long addr, unsigned long end, 251 unsigned long floor, unsigned long ceiling) 252 { 253 BUG(); 254 } 255 256 static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, 257 pte_t *dst_pte, 258 struct vm_area_struct *dst_vma, 259 unsigned long dst_addr, 260 unsigned long src_addr, 261 struct page **pagep) 262 { 263 BUG(); 264 return 0; 265 } 266 267 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, 268 unsigned long sz) 269 { 270 return NULL; 271 } 272 273 static inline bool isolate_huge_page(struct page *page, struct list_head *list) 274 { 275 return false; 276 } 277 278 static inline void putback_active_hugepage(struct page *page) 279 { 280 } 281 282 static inline void move_hugetlb_state(struct page *oldpage, 283 struct page *newpage, int reason) 284 { 285 } 286 287 static inline unsigned long hugetlb_change_protection( 288 struct vm_area_struct *vma, unsigned long address, 289 unsigned long end, pgprot_t newprot) 290 { 291 return 0; 292 } 293 294 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb, 295 struct vm_area_struct *vma, unsigned long start, 296 unsigned long end, struct page *ref_page) 297 { 298 BUG(); 299 } 300 301 static inline void __unmap_hugepage_range(struct mmu_gather *tlb, 302 struct vm_area_struct *vma, unsigned long start, 303 unsigned long end, struct page *ref_page) 304 { 305 BUG(); 306 } 307 308 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm, 309 struct vm_area_struct *vma, unsigned long address, 310 unsigned int flags) 311 { 312 BUG(); 313 return 0; 314 } 315 316 #endif /* !CONFIG_HUGETLB_PAGE */ 317 /* 318 * hugepages at page global directory. If arch support 319 * hugepages at pgd level, they need to define this. 320 */ 321 #ifndef pgd_huge 322 #define pgd_huge(x) 0 323 #endif 324 #ifndef p4d_huge 325 #define p4d_huge(x) 0 326 #endif 327 328 #ifndef pgd_write 329 static inline int pgd_write(pgd_t pgd) 330 { 331 BUG(); 332 return 0; 333 } 334 #endif 335 336 #define HUGETLB_ANON_FILE "anon_hugepage" 337 338 enum { 339 /* 340 * The file will be used as an shm file so shmfs accounting rules 341 * apply 342 */ 343 HUGETLB_SHMFS_INODE = 1, 344 /* 345 * The file is being created on the internal vfs mount and shmfs 346 * accounting rules do not apply 347 */ 348 HUGETLB_ANONHUGE_INODE = 2, 349 }; 350 351 #ifdef CONFIG_HUGETLBFS 352 struct hugetlbfs_sb_info { 353 long max_inodes; /* inodes allowed */ 354 long free_inodes; /* inodes free */ 355 spinlock_t stat_lock; 356 struct hstate *hstate; 357 struct hugepage_subpool *spool; 358 kuid_t uid; 359 kgid_t gid; 360 umode_t mode; 361 }; 362 363 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb) 364 { 365 return sb->s_fs_info; 366 } 367 368 struct hugetlbfs_inode_info { 369 struct shared_policy policy; 370 struct inode vfs_inode; 371 unsigned int seals; 372 }; 373 374 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) 375 { 376 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); 377 } 378 379 extern const struct file_operations hugetlbfs_file_operations; 380 extern const struct vm_operations_struct hugetlb_vm_ops; 381 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct, 382 struct user_struct **user, int creat_flags, 383 int page_size_log); 384 385 static inline bool is_file_hugepages(struct file *file) 386 { 387 if (file->f_op == &hugetlbfs_file_operations) 388 return true; 389 390 return is_file_shm_hugepages(file); 391 } 392 393 394 #else /* !CONFIG_HUGETLBFS */ 395 396 #define is_file_hugepages(file) false 397 static inline struct file * 398 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag, 399 struct user_struct **user, int creat_flags, 400 int page_size_log) 401 { 402 return ERR_PTR(-ENOSYS); 403 } 404 405 #endif /* !CONFIG_HUGETLBFS */ 406 407 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA 408 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, 409 unsigned long len, unsigned long pgoff, 410 unsigned long flags); 411 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */ 412 413 #ifdef CONFIG_HUGETLB_PAGE 414 415 #define HSTATE_NAME_LEN 32 416 /* Defines one hugetlb page size */ 417 struct hstate { 418 int next_nid_to_alloc; 419 int next_nid_to_free; 420 unsigned int order; 421 unsigned long mask; 422 unsigned long max_huge_pages; 423 unsigned long nr_huge_pages; 424 unsigned long free_huge_pages; 425 unsigned long resv_huge_pages; 426 unsigned long surplus_huge_pages; 427 unsigned long nr_overcommit_huge_pages; 428 struct list_head hugepage_activelist; 429 struct list_head hugepage_freelists[MAX_NUMNODES]; 430 unsigned int nr_huge_pages_node[MAX_NUMNODES]; 431 unsigned int free_huge_pages_node[MAX_NUMNODES]; 432 unsigned int surplus_huge_pages_node[MAX_NUMNODES]; 433 #ifdef CONFIG_CGROUP_HUGETLB 434 /* cgroup control files */ 435 struct cftype cgroup_files_dfl[5]; 436 struct cftype cgroup_files_legacy[5]; 437 #endif 438 char name[HSTATE_NAME_LEN]; 439 }; 440 441 struct huge_bootmem_page { 442 struct list_head list; 443 struct hstate *hstate; 444 }; 445 446 struct page *alloc_huge_page(struct vm_area_struct *vma, 447 unsigned long addr, int avoid_reserve); 448 struct page *alloc_huge_page_node(struct hstate *h, int nid); 449 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, 450 nodemask_t *nmask); 451 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma, 452 unsigned long address); 453 struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask, 454 int nid, nodemask_t *nmask); 455 int huge_add_to_page_cache(struct page *page, struct address_space *mapping, 456 pgoff_t idx); 457 458 /* arch callback */ 459 int __init __alloc_bootmem_huge_page(struct hstate *h); 460 int __init alloc_bootmem_huge_page(struct hstate *h); 461 462 void __init hugetlb_bad_size(void); 463 void __init hugetlb_add_hstate(unsigned order); 464 struct hstate *size_to_hstate(unsigned long size); 465 466 #ifndef HUGE_MAX_HSTATE 467 #define HUGE_MAX_HSTATE 1 468 #endif 469 470 extern struct hstate hstates[HUGE_MAX_HSTATE]; 471 extern unsigned int default_hstate_idx; 472 473 #define default_hstate (hstates[default_hstate_idx]) 474 475 static inline struct hstate *hstate_inode(struct inode *i) 476 { 477 return HUGETLBFS_SB(i->i_sb)->hstate; 478 } 479 480 static inline struct hstate *hstate_file(struct file *f) 481 { 482 return hstate_inode(file_inode(f)); 483 } 484 485 static inline struct hstate *hstate_sizelog(int page_size_log) 486 { 487 if (!page_size_log) 488 return &default_hstate; 489 490 return size_to_hstate(1UL << page_size_log); 491 } 492 493 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 494 { 495 return hstate_file(vma->vm_file); 496 } 497 498 static inline unsigned long huge_page_size(struct hstate *h) 499 { 500 return (unsigned long)PAGE_SIZE << h->order; 501 } 502 503 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma); 504 505 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma); 506 507 static inline unsigned long huge_page_mask(struct hstate *h) 508 { 509 return h->mask; 510 } 511 512 static inline unsigned int huge_page_order(struct hstate *h) 513 { 514 return h->order; 515 } 516 517 static inline unsigned huge_page_shift(struct hstate *h) 518 { 519 return h->order + PAGE_SHIFT; 520 } 521 522 static inline bool hstate_is_gigantic(struct hstate *h) 523 { 524 return huge_page_order(h) >= MAX_ORDER; 525 } 526 527 static inline unsigned int pages_per_huge_page(struct hstate *h) 528 { 529 return 1 << h->order; 530 } 531 532 static inline unsigned int blocks_per_huge_page(struct hstate *h) 533 { 534 return huge_page_size(h) / 512; 535 } 536 537 #include <asm/hugetlb.h> 538 539 #ifndef arch_make_huge_pte 540 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma, 541 struct page *page, int writable) 542 { 543 return entry; 544 } 545 #endif 546 547 static inline struct hstate *page_hstate(struct page *page) 548 { 549 VM_BUG_ON_PAGE(!PageHuge(page), page); 550 return size_to_hstate(page_size(page)); 551 } 552 553 static inline unsigned hstate_index_to_shift(unsigned index) 554 { 555 return hstates[index].order + PAGE_SHIFT; 556 } 557 558 static inline int hstate_index(struct hstate *h) 559 { 560 return h - hstates; 561 } 562 563 pgoff_t __basepage_index(struct page *page); 564 565 /* Return page->index in PAGE_SIZE units */ 566 static inline pgoff_t basepage_index(struct page *page) 567 { 568 if (!PageCompound(page)) 569 return page->index; 570 571 return __basepage_index(page); 572 } 573 574 extern int dissolve_free_huge_page(struct page *page); 575 extern int dissolve_free_huge_pages(unsigned long start_pfn, 576 unsigned long end_pfn); 577 578 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION 579 #ifndef arch_hugetlb_migration_supported 580 static inline bool arch_hugetlb_migration_supported(struct hstate *h) 581 { 582 if ((huge_page_shift(h) == PMD_SHIFT) || 583 (huge_page_shift(h) == PUD_SHIFT) || 584 (huge_page_shift(h) == PGDIR_SHIFT)) 585 return true; 586 else 587 return false; 588 } 589 #endif 590 #else 591 static inline bool arch_hugetlb_migration_supported(struct hstate *h) 592 { 593 return false; 594 } 595 #endif 596 597 static inline bool hugepage_migration_supported(struct hstate *h) 598 { 599 return arch_hugetlb_migration_supported(h); 600 } 601 602 /* 603 * Movability check is different as compared to migration check. 604 * It determines whether or not a huge page should be placed on 605 * movable zone or not. Movability of any huge page should be 606 * required only if huge page size is supported for migration. 607 * There wont be any reason for the huge page to be movable if 608 * it is not migratable to start with. Also the size of the huge 609 * page should be large enough to be placed under a movable zone 610 * and still feasible enough to be migratable. Just the presence 611 * in movable zone does not make the migration feasible. 612 * 613 * So even though large huge page sizes like the gigantic ones 614 * are migratable they should not be movable because its not 615 * feasible to migrate them from movable zone. 616 */ 617 static inline bool hugepage_movable_supported(struct hstate *h) 618 { 619 if (!hugepage_migration_supported(h)) 620 return false; 621 622 if (hstate_is_gigantic(h)) 623 return false; 624 return true; 625 } 626 627 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 628 struct mm_struct *mm, pte_t *pte) 629 { 630 if (huge_page_size(h) == PMD_SIZE) 631 return pmd_lockptr(mm, (pmd_t *) pte); 632 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE); 633 return &mm->page_table_lock; 634 } 635 636 #ifndef hugepages_supported 637 /* 638 * Some platform decide whether they support huge pages at boot 639 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0 640 * when there is no such support 641 */ 642 #define hugepages_supported() (HPAGE_SHIFT != 0) 643 #endif 644 645 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm); 646 647 static inline void hugetlb_count_add(long l, struct mm_struct *mm) 648 { 649 atomic_long_add(l, &mm->hugetlb_usage); 650 } 651 652 static inline void hugetlb_count_sub(long l, struct mm_struct *mm) 653 { 654 atomic_long_sub(l, &mm->hugetlb_usage); 655 } 656 657 #ifndef set_huge_swap_pte_at 658 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr, 659 pte_t *ptep, pte_t pte, unsigned long sz) 660 { 661 set_huge_pte_at(mm, addr, ptep, pte); 662 } 663 #endif 664 665 #ifndef huge_ptep_modify_prot_start 666 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start 667 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma, 668 unsigned long addr, pte_t *ptep) 669 { 670 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); 671 } 672 #endif 673 674 #ifndef huge_ptep_modify_prot_commit 675 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit 676 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, 677 unsigned long addr, pte_t *ptep, 678 pte_t old_pte, pte_t pte) 679 { 680 set_huge_pte_at(vma->vm_mm, addr, ptep, pte); 681 } 682 #endif 683 684 #else /* CONFIG_HUGETLB_PAGE */ 685 struct hstate {}; 686 687 static inline struct page *alloc_huge_page(struct vm_area_struct *vma, 688 unsigned long addr, 689 int avoid_reserve) 690 { 691 return NULL; 692 } 693 694 static inline struct page *alloc_huge_page_node(struct hstate *h, int nid) 695 { 696 return NULL; 697 } 698 699 static inline struct page * 700 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask) 701 { 702 return NULL; 703 } 704 705 static inline struct page *alloc_huge_page_vma(struct hstate *h, 706 struct vm_area_struct *vma, 707 unsigned long address) 708 { 709 return NULL; 710 } 711 712 static inline int __alloc_bootmem_huge_page(struct hstate *h) 713 { 714 return 0; 715 } 716 717 static inline struct hstate *hstate_file(struct file *f) 718 { 719 return NULL; 720 } 721 722 static inline struct hstate *hstate_sizelog(int page_size_log) 723 { 724 return NULL; 725 } 726 727 static inline struct hstate *hstate_vma(struct vm_area_struct *vma) 728 { 729 return NULL; 730 } 731 732 static inline struct hstate *hstate_inode(struct inode *i) 733 { 734 return NULL; 735 } 736 737 static inline struct hstate *page_hstate(struct page *page) 738 { 739 return NULL; 740 } 741 742 static inline unsigned long huge_page_size(struct hstate *h) 743 { 744 return PAGE_SIZE; 745 } 746 747 static inline unsigned long huge_page_mask(struct hstate *h) 748 { 749 return PAGE_MASK; 750 } 751 752 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) 753 { 754 return PAGE_SIZE; 755 } 756 757 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) 758 { 759 return PAGE_SIZE; 760 } 761 762 static inline unsigned int huge_page_order(struct hstate *h) 763 { 764 return 0; 765 } 766 767 static inline unsigned int huge_page_shift(struct hstate *h) 768 { 769 return PAGE_SHIFT; 770 } 771 772 static inline bool hstate_is_gigantic(struct hstate *h) 773 { 774 return false; 775 } 776 777 static inline unsigned int pages_per_huge_page(struct hstate *h) 778 { 779 return 1; 780 } 781 782 static inline unsigned hstate_index_to_shift(unsigned index) 783 { 784 return 0; 785 } 786 787 static inline int hstate_index(struct hstate *h) 788 { 789 return 0; 790 } 791 792 static inline pgoff_t basepage_index(struct page *page) 793 { 794 return page->index; 795 } 796 797 static inline int dissolve_free_huge_page(struct page *page) 798 { 799 return 0; 800 } 801 802 static inline int dissolve_free_huge_pages(unsigned long start_pfn, 803 unsigned long end_pfn) 804 { 805 return 0; 806 } 807 808 static inline bool hugepage_migration_supported(struct hstate *h) 809 { 810 return false; 811 } 812 813 static inline bool hugepage_movable_supported(struct hstate *h) 814 { 815 return false; 816 } 817 818 static inline spinlock_t *huge_pte_lockptr(struct hstate *h, 819 struct mm_struct *mm, pte_t *pte) 820 { 821 return &mm->page_table_lock; 822 } 823 824 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m) 825 { 826 } 827 828 static inline void hugetlb_count_sub(long l, struct mm_struct *mm) 829 { 830 } 831 832 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr, 833 pte_t *ptep, pte_t pte, unsigned long sz) 834 { 835 } 836 #endif /* CONFIG_HUGETLB_PAGE */ 837 838 static inline spinlock_t *huge_pte_lock(struct hstate *h, 839 struct mm_struct *mm, pte_t *pte) 840 { 841 spinlock_t *ptl; 842 843 ptl = huge_pte_lockptr(h, mm, pte); 844 spin_lock(ptl); 845 return ptl; 846 } 847 848 #endif /* _LINUX_HUGETLB_H */ 849