xref: /linux/include/linux/hugetlb.h (revision 52338415)
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 
302 #else /* !CONFIG_HUGETLBFS */
303 
304 #define is_file_hugepages(file)			false
305 static inline struct file *
306 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
307 		struct user_struct **user, int creat_flags,
308 		int page_size_log)
309 {
310 	return ERR_PTR(-ENOSYS);
311 }
312 
313 #endif /* !CONFIG_HUGETLBFS */
314 
315 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
316 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
317 					unsigned long len, unsigned long pgoff,
318 					unsigned long flags);
319 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
320 
321 #ifdef CONFIG_HUGETLB_PAGE
322 
323 #define HSTATE_NAME_LEN 32
324 /* Defines one hugetlb page size */
325 struct hstate {
326 	int next_nid_to_alloc;
327 	int next_nid_to_free;
328 	unsigned int order;
329 	unsigned long mask;
330 	unsigned long max_huge_pages;
331 	unsigned long nr_huge_pages;
332 	unsigned long free_huge_pages;
333 	unsigned long resv_huge_pages;
334 	unsigned long surplus_huge_pages;
335 	unsigned long nr_overcommit_huge_pages;
336 	struct list_head hugepage_activelist;
337 	struct list_head hugepage_freelists[MAX_NUMNODES];
338 	unsigned int nr_huge_pages_node[MAX_NUMNODES];
339 	unsigned int free_huge_pages_node[MAX_NUMNODES];
340 	unsigned int surplus_huge_pages_node[MAX_NUMNODES];
341 #ifdef CONFIG_CGROUP_HUGETLB
342 	/* cgroup control files */
343 	struct cftype cgroup_files[5];
344 #endif
345 	char name[HSTATE_NAME_LEN];
346 };
347 
348 struct huge_bootmem_page {
349 	struct list_head list;
350 	struct hstate *hstate;
351 };
352 
353 struct page *alloc_huge_page(struct vm_area_struct *vma,
354 				unsigned long addr, int avoid_reserve);
355 struct page *alloc_huge_page_node(struct hstate *h, int nid);
356 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
357 				nodemask_t *nmask);
358 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
359 				unsigned long address);
360 struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
361 				     int nid, nodemask_t *nmask);
362 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
363 			pgoff_t idx);
364 
365 /* arch callback */
366 int __init __alloc_bootmem_huge_page(struct hstate *h);
367 int __init alloc_bootmem_huge_page(struct hstate *h);
368 
369 void __init hugetlb_bad_size(void);
370 void __init hugetlb_add_hstate(unsigned order);
371 struct hstate *size_to_hstate(unsigned long size);
372 
373 #ifndef HUGE_MAX_HSTATE
374 #define HUGE_MAX_HSTATE 1
375 #endif
376 
377 extern struct hstate hstates[HUGE_MAX_HSTATE];
378 extern unsigned int default_hstate_idx;
379 
380 #define default_hstate (hstates[default_hstate_idx])
381 
382 static inline struct hstate *hstate_inode(struct inode *i)
383 {
384 	return HUGETLBFS_SB(i->i_sb)->hstate;
385 }
386 
387 static inline struct hstate *hstate_file(struct file *f)
388 {
389 	return hstate_inode(file_inode(f));
390 }
391 
392 static inline struct hstate *hstate_sizelog(int page_size_log)
393 {
394 	if (!page_size_log)
395 		return &default_hstate;
396 
397 	return size_to_hstate(1UL << page_size_log);
398 }
399 
400 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
401 {
402 	return hstate_file(vma->vm_file);
403 }
404 
405 static inline unsigned long huge_page_size(struct hstate *h)
406 {
407 	return (unsigned long)PAGE_SIZE << h->order;
408 }
409 
410 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
411 
412 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
413 
414 static inline unsigned long huge_page_mask(struct hstate *h)
415 {
416 	return h->mask;
417 }
418 
419 static inline unsigned int huge_page_order(struct hstate *h)
420 {
421 	return h->order;
422 }
423 
424 static inline unsigned huge_page_shift(struct hstate *h)
425 {
426 	return h->order + PAGE_SHIFT;
427 }
428 
429 static inline bool hstate_is_gigantic(struct hstate *h)
430 {
431 	return huge_page_order(h) >= MAX_ORDER;
432 }
433 
434 static inline unsigned int pages_per_huge_page(struct hstate *h)
435 {
436 	return 1 << h->order;
437 }
438 
439 static inline unsigned int blocks_per_huge_page(struct hstate *h)
440 {
441 	return huge_page_size(h) / 512;
442 }
443 
444 #include <asm/hugetlb.h>
445 
446 #ifndef arch_make_huge_pte
447 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
448 				       struct page *page, int writable)
449 {
450 	return entry;
451 }
452 #endif
453 
454 static inline struct hstate *page_hstate(struct page *page)
455 {
456 	VM_BUG_ON_PAGE(!PageHuge(page), page);
457 	return size_to_hstate(page_size(page));
458 }
459 
460 static inline unsigned hstate_index_to_shift(unsigned index)
461 {
462 	return hstates[index].order + PAGE_SHIFT;
463 }
464 
465 static inline int hstate_index(struct hstate *h)
466 {
467 	return h - hstates;
468 }
469 
470 pgoff_t __basepage_index(struct page *page);
471 
472 /* Return page->index in PAGE_SIZE units */
473 static inline pgoff_t basepage_index(struct page *page)
474 {
475 	if (!PageCompound(page))
476 		return page->index;
477 
478 	return __basepage_index(page);
479 }
480 
481 extern int dissolve_free_huge_page(struct page *page);
482 extern int dissolve_free_huge_pages(unsigned long start_pfn,
483 				    unsigned long end_pfn);
484 
485 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
486 #ifndef arch_hugetlb_migration_supported
487 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
488 {
489 	if ((huge_page_shift(h) == PMD_SHIFT) ||
490 		(huge_page_shift(h) == PUD_SHIFT) ||
491 			(huge_page_shift(h) == PGDIR_SHIFT))
492 		return true;
493 	else
494 		return false;
495 }
496 #endif
497 #else
498 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
499 {
500 	return false;
501 }
502 #endif
503 
504 static inline bool hugepage_migration_supported(struct hstate *h)
505 {
506 	return arch_hugetlb_migration_supported(h);
507 }
508 
509 /*
510  * Movability check is different as compared to migration check.
511  * It determines whether or not a huge page should be placed on
512  * movable zone or not. Movability of any huge page should be
513  * required only if huge page size is supported for migration.
514  * There wont be any reason for the huge page to be movable if
515  * it is not migratable to start with. Also the size of the huge
516  * page should be large enough to be placed under a movable zone
517  * and still feasible enough to be migratable. Just the presence
518  * in movable zone does not make the migration feasible.
519  *
520  * So even though large huge page sizes like the gigantic ones
521  * are migratable they should not be movable because its not
522  * feasible to migrate them from movable zone.
523  */
524 static inline bool hugepage_movable_supported(struct hstate *h)
525 {
526 	if (!hugepage_migration_supported(h))
527 		return false;
528 
529 	if (hstate_is_gigantic(h))
530 		return false;
531 	return true;
532 }
533 
534 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
535 					   struct mm_struct *mm, pte_t *pte)
536 {
537 	if (huge_page_size(h) == PMD_SIZE)
538 		return pmd_lockptr(mm, (pmd_t *) pte);
539 	VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
540 	return &mm->page_table_lock;
541 }
542 
543 #ifndef hugepages_supported
544 /*
545  * Some platform decide whether they support huge pages at boot
546  * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
547  * when there is no such support
548  */
549 #define hugepages_supported() (HPAGE_SHIFT != 0)
550 #endif
551 
552 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
553 
554 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
555 {
556 	atomic_long_add(l, &mm->hugetlb_usage);
557 }
558 
559 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
560 {
561 	atomic_long_sub(l, &mm->hugetlb_usage);
562 }
563 
564 #ifndef set_huge_swap_pte_at
565 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
566 					pte_t *ptep, pte_t pte, unsigned long sz)
567 {
568 	set_huge_pte_at(mm, addr, ptep, pte);
569 }
570 #endif
571 
572 #ifndef huge_ptep_modify_prot_start
573 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
574 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
575 						unsigned long addr, pte_t *ptep)
576 {
577 	return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
578 }
579 #endif
580 
581 #ifndef huge_ptep_modify_prot_commit
582 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
583 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
584 						unsigned long addr, pte_t *ptep,
585 						pte_t old_pte, pte_t pte)
586 {
587 	set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
588 }
589 #endif
590 
591 #else	/* CONFIG_HUGETLB_PAGE */
592 struct hstate {};
593 
594 static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
595 					   unsigned long addr,
596 					   int avoid_reserve)
597 {
598 	return NULL;
599 }
600 
601 static inline struct page *alloc_huge_page_node(struct hstate *h, int nid)
602 {
603 	return NULL;
604 }
605 
606 static inline struct page *
607 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask)
608 {
609 	return NULL;
610 }
611 
612 static inline struct page *alloc_huge_page_vma(struct hstate *h,
613 					       struct vm_area_struct *vma,
614 					       unsigned long address)
615 {
616 	return NULL;
617 }
618 
619 static inline int __alloc_bootmem_huge_page(struct hstate *h)
620 {
621 	return 0;
622 }
623 
624 static inline struct hstate *hstate_file(struct file *f)
625 {
626 	return NULL;
627 }
628 
629 static inline struct hstate *hstate_sizelog(int page_size_log)
630 {
631 	return NULL;
632 }
633 
634 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
635 {
636 	return NULL;
637 }
638 
639 static inline struct hstate *hstate_inode(struct inode *i)
640 {
641 	return NULL;
642 }
643 
644 static inline struct hstate *page_hstate(struct page *page)
645 {
646 	return NULL;
647 }
648 
649 static inline unsigned long huge_page_size(struct hstate *h)
650 {
651 	return PAGE_SIZE;
652 }
653 
654 static inline unsigned long huge_page_mask(struct hstate *h)
655 {
656 	return PAGE_MASK;
657 }
658 
659 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
660 {
661 	return PAGE_SIZE;
662 }
663 
664 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
665 {
666 	return PAGE_SIZE;
667 }
668 
669 static inline unsigned int huge_page_order(struct hstate *h)
670 {
671 	return 0;
672 }
673 
674 static inline unsigned int huge_page_shift(struct hstate *h)
675 {
676 	return PAGE_SHIFT;
677 }
678 
679 static inline bool hstate_is_gigantic(struct hstate *h)
680 {
681 	return false;
682 }
683 
684 static inline unsigned int pages_per_huge_page(struct hstate *h)
685 {
686 	return 1;
687 }
688 
689 static inline unsigned hstate_index_to_shift(unsigned index)
690 {
691 	return 0;
692 }
693 
694 static inline int hstate_index(struct hstate *h)
695 {
696 	return 0;
697 }
698 
699 static inline pgoff_t basepage_index(struct page *page)
700 {
701 	return page->index;
702 }
703 
704 static inline int dissolve_free_huge_page(struct page *page)
705 {
706 	return 0;
707 }
708 
709 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
710 					   unsigned long end_pfn)
711 {
712 	return 0;
713 }
714 
715 static inline bool hugepage_migration_supported(struct hstate *h)
716 {
717 	return false;
718 }
719 
720 static inline bool hugepage_movable_supported(struct hstate *h)
721 {
722 	return false;
723 }
724 
725 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
726 					   struct mm_struct *mm, pte_t *pte)
727 {
728 	return &mm->page_table_lock;
729 }
730 
731 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
732 {
733 }
734 
735 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
736 {
737 }
738 
739 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
740 					pte_t *ptep, pte_t pte, unsigned long sz)
741 {
742 }
743 #endif	/* CONFIG_HUGETLB_PAGE */
744 
745 static inline spinlock_t *huge_pte_lock(struct hstate *h,
746 					struct mm_struct *mm, pte_t *pte)
747 {
748 	spinlock_t *ptl;
749 
750 	ptl = huge_pte_lockptr(h, mm, pte);
751 	spin_lock(ptl);
752 	return ptl;
753 }
754 
755 #endif /* _LINUX_HUGETLB_H */
756