root/include/linux/hugetlb.h

/* [<][>][^][v][top][bottom][index][help] */

INCLUDED FROM

DEFINITIONS

This source file includes following definitions.
  1. reset_vma_resv_huge_pages
  2. hugetlb_total_pages
  3. huge_pmd_unshare
  4. adjust_range_if_pmd_sharing_possible
  5. hugetlb_report_meminfo
  6. hugetlb_show_meminfo
  7. isolate_huge_page
  8. hugetlb_change_protection
  9. __unmap_hugepage_range_final
  10. __unmap_hugepage_range
  11. hugetlb_fault
  12. pgd_write
  13. HUGETLBFS_SB
  14. HUGETLBFS_I
  15. is_file_hugepages
  16. hstate_inode
  17. hugetlb_file_setup
  18. hstate_inode
  19. hstate_file
  20. hstate_sizelog
  21. hstate_vma
  22. huge_page_size
  23. huge_page_mask
  24. huge_page_order
  25. huge_page_shift
  26. hstate_is_gigantic
  27. pages_per_huge_page
  28. blocks_per_huge_page
  29. arch_make_huge_pte
  30. page_hstate
  31. hstate_index_to_shift
  32. hstate_index
  33. basepage_index
  34. arch_hugetlb_migration_supported
  35. arch_hugetlb_migration_supported
  36. hugepage_migration_supported
  37. hugepage_movable_supported
  38. huge_pte_lockptr
  39. hugetlb_count_add
  40. hugetlb_count_sub
  41. set_huge_swap_pte_at
  42. huge_ptep_modify_prot_start
  43. huge_ptep_modify_prot_commit
  44. alloc_huge_page
  45. alloc_huge_page_node
  46. alloc_huge_page_nodemask
  47. alloc_huge_page_vma
  48. __alloc_bootmem_huge_page
  49. hstate_file
  50. hstate_sizelog
  51. hstate_vma
  52. page_hstate
  53. huge_page_size
  54. huge_page_mask
  55. vma_kernel_pagesize
  56. vma_mmu_pagesize
  57. huge_page_order
  58. huge_page_shift
  59. hstate_is_gigantic
  60. pages_per_huge_page
  61. hstate_index_to_shift
  62. hstate_index
  63. basepage_index
  64. dissolve_free_huge_page
  65. dissolve_free_huge_pages
  66. hugepage_migration_supported
  67. hugepage_movable_supported
  68. huge_pte_lockptr
  69. hugetlb_report_usage
  70. hugetlb_count_sub
  71. set_huge_swap_pte_at
  72. huge_pte_lock
   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 hstate *h, struct address_space *mapping,
 109                                 pgoff_t idx, unsigned long address);
 110 
 111 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
 112 
 113 extern int sysctl_hugetlb_shm_group;
 114 extern struct list_head huge_boot_pages;
 115 
 116 /* arch callbacks */
 117 
 118 pte_t *huge_pte_alloc(struct mm_struct *mm,
 119                         unsigned long addr, unsigned long sz);
 120 pte_t *huge_pte_offset(struct mm_struct *mm,
 121                        unsigned long addr, unsigned long sz);
 122 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
 123 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
 124                                 unsigned long *start, unsigned long *end);
 125 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
 126                               int write);
 127 struct page *follow_huge_pd(struct vm_area_struct *vma,
 128                             unsigned long address, hugepd_t hpd,
 129                             int flags, int pdshift);
 130 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
 131                                 pmd_t *pmd, int flags);
 132 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
 133                                 pud_t *pud, int flags);
 134 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
 135                              pgd_t *pgd, int flags);
 136 
 137 int pmd_huge(pmd_t pmd);
 138 int pud_huge(pud_t pud);
 139 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 140                 unsigned long address, unsigned long end, pgprot_t newprot);
 141 
 142 bool is_hugetlb_entry_migration(pte_t pte);
 143 
 144 #else /* !CONFIG_HUGETLB_PAGE */
 145 
 146 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 147 {
 148 }
 149 
 150 static inline unsigned long hugetlb_total_pages(void)
 151 {
 152         return 0;
 153 }
 154 
 155 static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
 156                                         pte_t *ptep)
 157 {
 158         return 0;
 159 }
 160 
 161 static inline void adjust_range_if_pmd_sharing_possible(
 162                                 struct vm_area_struct *vma,
 163                                 unsigned long *start, unsigned long *end)
 164 {
 165 }
 166 
 167 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w,n) ({ BUG(); 0; })
 168 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 169 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 170 static inline void hugetlb_report_meminfo(struct seq_file *m)
 171 {
 172 }
 173 #define hugetlb_report_node_meminfo(n, buf)     0
 174 static inline void hugetlb_show_meminfo(void)
 175 {
 176 }
 177 #define follow_huge_pd(vma, addr, hpd, flags, pdshift) NULL
 178 #define follow_huge_pmd(mm, addr, pmd, flags)   NULL
 179 #define follow_huge_pud(mm, addr, pud, flags)   NULL
 180 #define follow_huge_pgd(mm, addr, pgd, flags)   NULL
 181 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 182 #define pmd_huge(x)     0
 183 #define pud_huge(x)     0
 184 #define is_hugepage_only_range(mm, addr, len)   0
 185 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 186 #define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
 187                                 src_addr, pagep)        ({ BUG(); 0; })
 188 #define huge_pte_offset(mm, address, sz)        0
 189 
 190 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
 191 {
 192         return false;
 193 }
 194 #define putback_active_hugepage(p)      do {} while (0)
 195 #define move_hugetlb_state(old, new, reason)    do {} while (0)
 196 
 197 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 198                 unsigned long address, unsigned long end, pgprot_t newprot)
 199 {
 200         return 0;
 201 }
 202 
 203 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 204                         struct vm_area_struct *vma, unsigned long start,
 205                         unsigned long end, struct page *ref_page)
 206 {
 207         BUG();
 208 }
 209 
 210 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 211                         struct vm_area_struct *vma, unsigned long start,
 212                         unsigned long end, struct page *ref_page)
 213 {
 214         BUG();
 215 }
 216 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
 217                                 struct vm_area_struct *vma, unsigned long address,
 218                                 unsigned int flags)
 219 {
 220         BUG();
 221         return 0;
 222 }
 223 
 224 #endif /* !CONFIG_HUGETLB_PAGE */
 225 /*
 226  * hugepages at page global directory. If arch support
 227  * hugepages at pgd level, they need to define this.
 228  */
 229 #ifndef pgd_huge
 230 #define pgd_huge(x)     0
 231 #endif
 232 #ifndef p4d_huge
 233 #define p4d_huge(x)     0
 234 #endif
 235 
 236 #ifndef pgd_write
 237 static inline int pgd_write(pgd_t pgd)
 238 {
 239         BUG();
 240         return 0;
 241 }
 242 #endif
 243 
 244 #define HUGETLB_ANON_FILE "anon_hugepage"
 245 
 246 enum {
 247         /*
 248          * The file will be used as an shm file so shmfs accounting rules
 249          * apply
 250          */
 251         HUGETLB_SHMFS_INODE     = 1,
 252         /*
 253          * The file is being created on the internal vfs mount and shmfs
 254          * accounting rules do not apply
 255          */
 256         HUGETLB_ANONHUGE_INODE  = 2,
 257 };
 258 
 259 #ifdef CONFIG_HUGETLBFS
 260 struct hugetlbfs_sb_info {
 261         long    max_inodes;   /* inodes allowed */
 262         long    free_inodes;  /* inodes free */
 263         spinlock_t      stat_lock;
 264         struct hstate *hstate;
 265         struct hugepage_subpool *spool;
 266         kuid_t  uid;
 267         kgid_t  gid;
 268         umode_t mode;
 269 };
 270 
 271 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 272 {
 273         return sb->s_fs_info;
 274 }
 275 
 276 struct hugetlbfs_inode_info {
 277         struct shared_policy policy;
 278         struct inode vfs_inode;
 279         unsigned int seals;
 280 };
 281 
 282 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
 283 {
 284         return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
 285 }
 286 
 287 extern const struct file_operations hugetlbfs_file_operations;
 288 extern const struct vm_operations_struct hugetlb_vm_ops;
 289 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 290                                 struct user_struct **user, int creat_flags,
 291                                 int page_size_log);
 292 
 293 static inline bool is_file_hugepages(struct file *file)
 294 {
 295         if (file->f_op == &hugetlbfs_file_operations)
 296                 return true;
 297 
 298         return is_file_shm_hugepages(file);
 299 }
 300 
 301 static inline struct hstate *hstate_inode(struct inode *i)
 302 {
 303         return HUGETLBFS_SB(i->i_sb)->hstate;
 304 }
 305 #else /* !CONFIG_HUGETLBFS */
 306 
 307 #define is_file_hugepages(file)                 false
 308 static inline struct file *
 309 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
 310                 struct user_struct **user, int creat_flags,
 311                 int page_size_log)
 312 {
 313         return ERR_PTR(-ENOSYS);
 314 }
 315 
 316 static inline struct hstate *hstate_inode(struct inode *i)
 317 {
 318         return NULL;
 319 }
 320 #endif /* !CONFIG_HUGETLBFS */
 321 
 322 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 323 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 324                                         unsigned long len, unsigned long pgoff,
 325                                         unsigned long flags);
 326 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 327 
 328 #ifdef CONFIG_HUGETLB_PAGE
 329 
 330 #define HSTATE_NAME_LEN 32
 331 /* Defines one hugetlb page size */
 332 struct hstate {
 333         int next_nid_to_alloc;
 334         int next_nid_to_free;
 335         unsigned int order;
 336         unsigned long mask;
 337         unsigned long max_huge_pages;
 338         unsigned long nr_huge_pages;
 339         unsigned long free_huge_pages;
 340         unsigned long resv_huge_pages;
 341         unsigned long surplus_huge_pages;
 342         unsigned long nr_overcommit_huge_pages;
 343         struct list_head hugepage_activelist;
 344         struct list_head hugepage_freelists[MAX_NUMNODES];
 345         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 346         unsigned int free_huge_pages_node[MAX_NUMNODES];
 347         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 348 #ifdef CONFIG_CGROUP_HUGETLB
 349         /* cgroup control files */
 350         struct cftype cgroup_files[5];
 351 #endif
 352         char name[HSTATE_NAME_LEN];
 353 };
 354 
 355 struct huge_bootmem_page {
 356         struct list_head list;
 357         struct hstate *hstate;
 358 };
 359 
 360 struct page *alloc_huge_page(struct vm_area_struct *vma,
 361                                 unsigned long addr, int avoid_reserve);
 362 struct page *alloc_huge_page_node(struct hstate *h, int nid);
 363 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
 364                                 nodemask_t *nmask);
 365 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
 366                                 unsigned long address);
 367 struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
 368                                      int nid, nodemask_t *nmask);
 369 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
 370                         pgoff_t idx);
 371 
 372 /* arch callback */
 373 int __init __alloc_bootmem_huge_page(struct hstate *h);
 374 int __init alloc_bootmem_huge_page(struct hstate *h);
 375 
 376 void __init hugetlb_bad_size(void);
 377 void __init hugetlb_add_hstate(unsigned order);
 378 struct hstate *size_to_hstate(unsigned long size);
 379 
 380 #ifndef HUGE_MAX_HSTATE
 381 #define HUGE_MAX_HSTATE 1
 382 #endif
 383 
 384 extern struct hstate hstates[HUGE_MAX_HSTATE];
 385 extern unsigned int default_hstate_idx;
 386 
 387 #define default_hstate (hstates[default_hstate_idx])
 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(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 
 487 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
 488 #ifndef arch_hugetlb_migration_supported
 489 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
 490 {
 491         if ((huge_page_shift(h) == PMD_SHIFT) ||
 492                 (huge_page_shift(h) == PUD_SHIFT) ||
 493                         (huge_page_shift(h) == PGDIR_SHIFT))
 494                 return true;
 495         else
 496                 return false;
 497 }
 498 #endif
 499 #else
 500 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
 501 {
 502         return false;
 503 }
 504 #endif
 505 
 506 static inline bool hugepage_migration_supported(struct hstate *h)
 507 {
 508         return arch_hugetlb_migration_supported(h);
 509 }
 510 
 511 /*
 512  * Movability check is different as compared to migration check.
 513  * It determines whether or not a huge page should be placed on
 514  * movable zone or not. Movability of any huge page should be
 515  * required only if huge page size is supported for migration.
 516  * There wont be any reason for the huge page to be movable if
 517  * it is not migratable to start with. Also the size of the huge
 518  * page should be large enough to be placed under a movable zone
 519  * and still feasible enough to be migratable. Just the presence
 520  * in movable zone does not make the migration feasible.
 521  *
 522  * So even though large huge page sizes like the gigantic ones
 523  * are migratable they should not be movable because its not
 524  * feasible to migrate them from movable zone.
 525  */
 526 static inline bool hugepage_movable_supported(struct hstate *h)
 527 {
 528         if (!hugepage_migration_supported(h))
 529                 return false;
 530 
 531         if (hstate_is_gigantic(h))
 532                 return false;
 533         return true;
 534 }
 535 
 536 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 537                                            struct mm_struct *mm, pte_t *pte)
 538 {
 539         if (huge_page_size(h) == PMD_SIZE)
 540                 return pmd_lockptr(mm, (pmd_t *) pte);
 541         VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
 542         return &mm->page_table_lock;
 543 }
 544 
 545 #ifndef hugepages_supported
 546 /*
 547  * Some platform decide whether they support huge pages at boot
 548  * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
 549  * when there is no such support
 550  */
 551 #define hugepages_supported() (HPAGE_SHIFT != 0)
 552 #endif
 553 
 554 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
 555 
 556 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
 557 {
 558         atomic_long_add(l, &mm->hugetlb_usage);
 559 }
 560 
 561 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
 562 {
 563         atomic_long_sub(l, &mm->hugetlb_usage);
 564 }
 565 
 566 #ifndef set_huge_swap_pte_at
 567 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
 568                                         pte_t *ptep, pte_t pte, unsigned long sz)
 569 {
 570         set_huge_pte_at(mm, addr, ptep, pte);
 571 }
 572 #endif
 573 
 574 #ifndef huge_ptep_modify_prot_start
 575 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
 576 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
 577                                                 unsigned long addr, pte_t *ptep)
 578 {
 579         return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
 580 }
 581 #endif
 582 
 583 #ifndef huge_ptep_modify_prot_commit
 584 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
 585 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
 586                                                 unsigned long addr, pte_t *ptep,
 587                                                 pte_t old_pte, pte_t pte)
 588 {
 589         set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
 590 }
 591 #endif
 592 
 593 #else   /* CONFIG_HUGETLB_PAGE */
 594 struct hstate {};
 595 
 596 static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
 597                                            unsigned long addr,
 598                                            int avoid_reserve)
 599 {
 600         return NULL;
 601 }
 602 
 603 static inline struct page *alloc_huge_page_node(struct hstate *h, int nid)
 604 {
 605         return NULL;
 606 }
 607 
 608 static inline struct page *
 609 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask)
 610 {
 611         return NULL;
 612 }
 613 
 614 static inline struct page *alloc_huge_page_vma(struct hstate *h,
 615                                                struct vm_area_struct *vma,
 616                                                unsigned long address)
 617 {
 618         return NULL;
 619 }
 620 
 621 static inline int __alloc_bootmem_huge_page(struct hstate *h)
 622 {
 623         return 0;
 624 }
 625 
 626 static inline struct hstate *hstate_file(struct file *f)
 627 {
 628         return NULL;
 629 }
 630 
 631 static inline struct hstate *hstate_sizelog(int page_size_log)
 632 {
 633         return NULL;
 634 }
 635 
 636 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 637 {
 638         return NULL;
 639 }
 640 
 641 static inline struct hstate *page_hstate(struct page *page)
 642 {
 643         return NULL;
 644 }
 645 
 646 static inline unsigned long huge_page_size(struct hstate *h)
 647 {
 648         return PAGE_SIZE;
 649 }
 650 
 651 static inline unsigned long huge_page_mask(struct hstate *h)
 652 {
 653         return PAGE_MASK;
 654 }
 655 
 656 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
 657 {
 658         return PAGE_SIZE;
 659 }
 660 
 661 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
 662 {
 663         return PAGE_SIZE;
 664 }
 665 
 666 static inline unsigned int huge_page_order(struct hstate *h)
 667 {
 668         return 0;
 669 }
 670 
 671 static inline unsigned int huge_page_shift(struct hstate *h)
 672 {
 673         return PAGE_SHIFT;
 674 }
 675 
 676 static inline bool hstate_is_gigantic(struct hstate *h)
 677 {
 678         return false;
 679 }
 680 
 681 static inline unsigned int pages_per_huge_page(struct hstate *h)
 682 {
 683         return 1;
 684 }
 685 
 686 static inline unsigned hstate_index_to_shift(unsigned index)
 687 {
 688         return 0;
 689 }
 690 
 691 static inline int hstate_index(struct hstate *h)
 692 {
 693         return 0;
 694 }
 695 
 696 static inline pgoff_t basepage_index(struct page *page)
 697 {
 698         return page->index;
 699 }
 700 
 701 static inline int dissolve_free_huge_page(struct page *page)
 702 {
 703         return 0;
 704 }
 705 
 706 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
 707                                            unsigned long end_pfn)
 708 {
 709         return 0;
 710 }
 711 
 712 static inline bool hugepage_migration_supported(struct hstate *h)
 713 {
 714         return false;
 715 }
 716 
 717 static inline bool hugepage_movable_supported(struct hstate *h)
 718 {
 719         return false;
 720 }
 721 
 722 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 723                                            struct mm_struct *mm, pte_t *pte)
 724 {
 725         return &mm->page_table_lock;
 726 }
 727 
 728 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
 729 {
 730 }
 731 
 732 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
 733 {
 734 }
 735 
 736 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
 737                                         pte_t *ptep, pte_t pte, unsigned long sz)
 738 {
 739 }
 740 #endif  /* CONFIG_HUGETLB_PAGE */
 741 
 742 static inline spinlock_t *huge_pte_lock(struct hstate *h,
 743                                         struct mm_struct *mm, pte_t *pte)
 744 {
 745         spinlock_t *ptl;
 746 
 747         ptl = huge_pte_lockptr(h, mm, pte);
 748         spin_lock(ptl);
 749         return ptl;
 750 }
 751 
 752 #endif /* _LINUX_HUGETLB_H */
/* [<][>][^][v][top][bottom][index][help] */