1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_HUGETLB_H
3 #define _LINUX_HUGETLB_H
5 #include <linux/mm_types.h>
6 #include <linux/mmdebug.h>
8 #include <linux/hugetlb_inline.h>
9 #include <linux/cgroup.h>
10 #include <linux/list.h>
11 #include <linux/kref.h>
12 #include <linux/pgtable.h>
19 typedef struct { unsigned long pd; } hugepd_t;
20 #define is_hugepd(hugepd) (0)
21 #define __hugepd(x) ((hugepd_t) { (x) })
24 #ifdef CONFIG_HUGETLB_PAGE
26 #include <linux/mempolicy.h>
27 #include <linux/shm.h>
28 #include <asm/tlbflush.h>
30 struct hugepage_subpool {
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. */
45 struct list_head regions;
46 long adds_in_progress;
47 struct list_head region_cache;
48 long region_cache_count;
49 #ifdef CONFIG_CGROUP_HUGETLB
51 * On private mappings, the counter to uncharge reservations is stored
52 * here. If these fields are 0, then either the mapping is shared, or
53 * cgroup accounting is disabled for this resv_map.
55 struct page_counter *reservation_counter;
56 unsigned long pages_per_hpage;
57 struct cgroup_subsys_state *css;
62 * Region tracking -- allows tracking of reservations and instantiated pages
63 * across the pages in a mapping.
65 * The region data structures are embedded into a resv_map and protected
66 * by a resv_map's lock. The set of regions within the resv_map represent
67 * reservations for huge pages, or huge pages that have already been
68 * instantiated within the map. The from and to elements are huge page
69 * indicies into the associated mapping. from indicates the starting index
70 * of the region. to represents the first index past the end of the region.
72 * For example, a file region structure with from == 0 and to == 4 represents
73 * four huge pages in a mapping. It is important to note that the to element
74 * represents the first element past the end of the region. This is used in
75 * arithmetic as 4(to) - 0(from) = 4 huge pages in the region.
77 * Interval notation of the form [from, to) will be used to indicate that
78 * the endpoint from is inclusive and to is exclusive.
81 struct list_head link;
84 #ifdef CONFIG_CGROUP_HUGETLB
86 * On shared mappings, each reserved region appears as a struct
87 * file_region in resv_map. These fields hold the info needed to
88 * uncharge each reservation.
90 struct page_counter *reservation_counter;
91 struct cgroup_subsys_state *css;
95 extern struct resv_map *resv_map_alloc(void);
96 void resv_map_release(struct kref *ref);
98 extern spinlock_t hugetlb_lock;
99 extern int hugetlb_max_hstate __read_mostly;
100 #define for_each_hstate(h) \
101 for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
103 struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
105 void hugepage_put_subpool(struct hugepage_subpool *spool);
107 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
108 int hugetlb_sysctl_handler(struct ctl_table *, int, void *, size_t *, loff_t *);
109 int hugetlb_overcommit_handler(struct ctl_table *, int, void *, size_t *,
111 int hugetlb_treat_movable_handler(struct ctl_table *, int, void *, size_t *,
113 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int, void *, size_t *,
116 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
117 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
118 struct page **, struct vm_area_struct **,
119 unsigned long *, unsigned long *, long, unsigned int,
121 void unmap_hugepage_range(struct vm_area_struct *,
122 unsigned long, unsigned long, struct page *);
123 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
124 struct vm_area_struct *vma,
125 unsigned long start, unsigned long end,
126 struct page *ref_page);
127 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
128 unsigned long start, unsigned long end,
129 struct page *ref_page);
130 void hugetlb_report_meminfo(struct seq_file *);
131 int hugetlb_report_node_meminfo(int, char *);
132 void hugetlb_show_meminfo(void);
133 unsigned long hugetlb_total_pages(void);
134 vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
135 unsigned long address, unsigned int flags);
136 int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
137 struct vm_area_struct *dst_vma,
138 unsigned long dst_addr,
139 unsigned long src_addr,
140 struct page **pagep);
141 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
142 struct vm_area_struct *vma,
143 vm_flags_t vm_flags);
144 long hugetlb_unreserve_pages(struct inode *inode, long start, long end,
146 bool isolate_huge_page(struct page *page, struct list_head *list);
147 void putback_active_hugepage(struct page *page);
148 void move_hugetlb_state(struct page *oldpage, struct page *newpage, int reason);
149 void free_huge_page(struct page *page);
150 void hugetlb_fix_reserve_counts(struct inode *inode);
151 extern struct mutex *hugetlb_fault_mutex_table;
152 u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
154 pte_t *huge_pmd_share(struct mm_struct *mm, unsigned long addr, pud_t *pud);
156 struct address_space *hugetlb_page_mapping_lock_write(struct page *hpage);
158 extern int sysctl_hugetlb_shm_group;
159 extern struct list_head huge_boot_pages;
163 pte_t *huge_pte_alloc(struct mm_struct *mm,
164 unsigned long addr, unsigned long sz);
165 pte_t *huge_pte_offset(struct mm_struct *mm,
166 unsigned long addr, unsigned long sz);
167 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
168 void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,
169 unsigned long *start, unsigned long *end);
170 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
172 struct page *follow_huge_pd(struct vm_area_struct *vma,
173 unsigned long address, hugepd_t hpd,
174 int flags, int pdshift);
175 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
176 pmd_t *pmd, int flags);
177 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
178 pud_t *pud, int flags);
179 struct page *follow_huge_pgd(struct mm_struct *mm, unsigned long address,
180 pgd_t *pgd, int flags);
182 int pmd_huge(pmd_t pmd);
183 int pud_huge(pud_t pud);
184 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
185 unsigned long address, unsigned long end, pgprot_t newprot);
187 bool is_hugetlb_entry_migration(pte_t pte);
189 #else /* !CONFIG_HUGETLB_PAGE */
191 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
195 static inline unsigned long hugetlb_total_pages(void)
200 static inline struct address_space *hugetlb_page_mapping_lock_write(
206 static inline int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr,
212 static inline void adjust_range_if_pmd_sharing_possible(
213 struct vm_area_struct *vma,
214 unsigned long *start, unsigned long *end)
218 static inline long follow_hugetlb_page(struct mm_struct *mm,
219 struct vm_area_struct *vma, struct page **pages,
220 struct vm_area_struct **vmas, unsigned long *position,
221 unsigned long *nr_pages, long i, unsigned int flags,
228 static inline struct page *follow_huge_addr(struct mm_struct *mm,
229 unsigned long address, int write)
231 return ERR_PTR(-EINVAL);
234 static inline int copy_hugetlb_page_range(struct mm_struct *dst,
235 struct mm_struct *src, struct vm_area_struct *vma)
241 static inline void hugetlb_report_meminfo(struct seq_file *m)
245 static inline int hugetlb_report_node_meminfo(int nid, char *buf)
250 static inline void hugetlb_show_meminfo(void)
254 static inline struct page *follow_huge_pd(struct vm_area_struct *vma,
255 unsigned long address, hugepd_t hpd, int flags,
261 static inline struct page *follow_huge_pmd(struct mm_struct *mm,
262 unsigned long address, pmd_t *pmd, int flags)
267 static inline struct page *follow_huge_pud(struct mm_struct *mm,
268 unsigned long address, pud_t *pud, int flags)
273 static inline struct page *follow_huge_pgd(struct mm_struct *mm,
274 unsigned long address, pgd_t *pgd, int flags)
279 static inline int prepare_hugepage_range(struct file *file,
280 unsigned long addr, unsigned long len)
285 static inline int pmd_huge(pmd_t pmd)
290 static inline int pud_huge(pud_t pud)
295 static inline int is_hugepage_only_range(struct mm_struct *mm,
296 unsigned long addr, unsigned long len)
301 static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
302 unsigned long addr, unsigned long end,
303 unsigned long floor, unsigned long ceiling)
308 static inline int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
310 struct vm_area_struct *dst_vma,
311 unsigned long dst_addr,
312 unsigned long src_addr,
319 static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
325 static inline bool isolate_huge_page(struct page *page, struct list_head *list)
330 static inline void putback_active_hugepage(struct page *page)
334 static inline void move_hugetlb_state(struct page *oldpage,
335 struct page *newpage, int reason)
339 static inline unsigned long hugetlb_change_protection(
340 struct vm_area_struct *vma, unsigned long address,
341 unsigned long end, pgprot_t newprot)
346 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
347 struct vm_area_struct *vma, unsigned long start,
348 unsigned long end, struct page *ref_page)
353 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
354 struct vm_area_struct *vma, unsigned long start,
355 unsigned long end, struct page *ref_page)
360 static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
361 struct vm_area_struct *vma, unsigned long address,
368 #endif /* !CONFIG_HUGETLB_PAGE */
370 * hugepages at page global directory. If arch support
371 * hugepages at pgd level, they need to define this.
374 #define pgd_huge(x) 0
377 #define p4d_huge(x) 0
381 static inline int pgd_write(pgd_t pgd)
388 #define HUGETLB_ANON_FILE "anon_hugepage"
392 * The file will be used as an shm file so shmfs accounting rules
395 HUGETLB_SHMFS_INODE = 1,
397 * The file is being created on the internal vfs mount and shmfs
398 * accounting rules do not apply
400 HUGETLB_ANONHUGE_INODE = 2,
403 #ifdef CONFIG_HUGETLBFS
404 struct hugetlbfs_sb_info {
405 long max_inodes; /* inodes allowed */
406 long free_inodes; /* inodes free */
407 spinlock_t stat_lock;
408 struct hstate *hstate;
409 struct hugepage_subpool *spool;
415 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
417 return sb->s_fs_info;
420 struct hugetlbfs_inode_info {
421 struct shared_policy policy;
422 struct inode vfs_inode;
426 static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
428 return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
431 extern const struct file_operations hugetlbfs_file_operations;
432 extern const struct vm_operations_struct hugetlb_vm_ops;
433 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
434 struct user_struct **user, int creat_flags,
437 static inline bool is_file_hugepages(struct file *file)
439 if (file->f_op == &hugetlbfs_file_operations)
442 return is_file_shm_hugepages(file);
445 static inline struct hstate *hstate_inode(struct inode *i)
447 return HUGETLBFS_SB(i->i_sb)->hstate;
449 #else /* !CONFIG_HUGETLBFS */
451 #define is_file_hugepages(file) false
452 static inline struct file *
453 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
454 struct user_struct **user, int creat_flags,
457 return ERR_PTR(-ENOSYS);
460 static inline struct hstate *hstate_inode(struct inode *i)
464 #endif /* !CONFIG_HUGETLBFS */
466 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
467 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
468 unsigned long len, unsigned long pgoff,
469 unsigned long flags);
470 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
472 #ifdef CONFIG_HUGETLB_PAGE
474 #define HSTATE_NAME_LEN 32
475 /* Defines one hugetlb page size */
477 int next_nid_to_alloc;
478 int next_nid_to_free;
481 unsigned long max_huge_pages;
482 unsigned long nr_huge_pages;
483 unsigned long free_huge_pages;
484 unsigned long resv_huge_pages;
485 unsigned long surplus_huge_pages;
486 unsigned long nr_overcommit_huge_pages;
487 struct list_head hugepage_activelist;
488 struct list_head hugepage_freelists[MAX_NUMNODES];
489 unsigned int nr_huge_pages_node[MAX_NUMNODES];
490 unsigned int free_huge_pages_node[MAX_NUMNODES];
491 unsigned int surplus_huge_pages_node[MAX_NUMNODES];
492 #ifdef CONFIG_CGROUP_HUGETLB
493 /* cgroup control files */
494 struct cftype cgroup_files_dfl[7];
495 struct cftype cgroup_files_legacy[9];
497 char name[HSTATE_NAME_LEN];
500 struct huge_bootmem_page {
501 struct list_head list;
502 struct hstate *hstate;
505 struct page *alloc_huge_page(struct vm_area_struct *vma,
506 unsigned long addr, int avoid_reserve);
507 struct page *alloc_huge_page_node(struct hstate *h, int nid);
508 struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
510 struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
511 unsigned long address);
512 struct page *alloc_migrate_huge_page(struct hstate *h, gfp_t gfp_mask,
513 int nid, nodemask_t *nmask);
514 int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
518 int __init __alloc_bootmem_huge_page(struct hstate *h);
519 int __init alloc_bootmem_huge_page(struct hstate *h);
521 void __init hugetlb_add_hstate(unsigned order);
522 bool __init arch_hugetlb_valid_size(unsigned long size);
523 struct hstate *size_to_hstate(unsigned long size);
525 #ifndef HUGE_MAX_HSTATE
526 #define HUGE_MAX_HSTATE 1
529 extern struct hstate hstates[HUGE_MAX_HSTATE];
530 extern unsigned int default_hstate_idx;
532 #define default_hstate (hstates[default_hstate_idx])
534 static inline struct hstate *hstate_file(struct file *f)
536 return hstate_inode(file_inode(f));
539 static inline struct hstate *hstate_sizelog(int page_size_log)
542 return &default_hstate;
544 return size_to_hstate(1UL << page_size_log);
547 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
549 return hstate_file(vma->vm_file);
552 static inline unsigned long huge_page_size(struct hstate *h)
554 return (unsigned long)PAGE_SIZE << h->order;
557 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
559 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
561 static inline unsigned long huge_page_mask(struct hstate *h)
566 static inline unsigned int huge_page_order(struct hstate *h)
571 static inline unsigned huge_page_shift(struct hstate *h)
573 return h->order + PAGE_SHIFT;
576 static inline bool hstate_is_gigantic(struct hstate *h)
578 return huge_page_order(h) >= MAX_ORDER;
581 static inline unsigned int pages_per_huge_page(struct hstate *h)
583 return 1 << h->order;
586 static inline unsigned int blocks_per_huge_page(struct hstate *h)
588 return huge_page_size(h) / 512;
591 #include <asm/hugetlb.h>
593 #ifndef is_hugepage_only_range
594 static inline int is_hugepage_only_range(struct mm_struct *mm,
595 unsigned long addr, unsigned long len)
599 #define is_hugepage_only_range is_hugepage_only_range
602 #ifndef arch_clear_hugepage_flags
603 static inline void arch_clear_hugepage_flags(struct page *page) { }
604 #define arch_clear_hugepage_flags arch_clear_hugepage_flags
607 #ifndef arch_make_huge_pte
608 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
609 struct page *page, int writable)
615 static inline struct hstate *page_hstate(struct page *page)
617 VM_BUG_ON_PAGE(!PageHuge(page), page);
618 return size_to_hstate(page_size(page));
621 static inline unsigned hstate_index_to_shift(unsigned index)
623 return hstates[index].order + PAGE_SHIFT;
626 static inline int hstate_index(struct hstate *h)
631 pgoff_t __basepage_index(struct page *page);
633 /* Return page->index in PAGE_SIZE units */
634 static inline pgoff_t basepage_index(struct page *page)
636 if (!PageCompound(page))
639 return __basepage_index(page);
642 extern int dissolve_free_huge_page(struct page *page);
643 extern int dissolve_free_huge_pages(unsigned long start_pfn,
644 unsigned long end_pfn);
646 #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
647 #ifndef arch_hugetlb_migration_supported
648 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
650 if ((huge_page_shift(h) == PMD_SHIFT) ||
651 (huge_page_shift(h) == PUD_SHIFT) ||
652 (huge_page_shift(h) == PGDIR_SHIFT))
659 static inline bool arch_hugetlb_migration_supported(struct hstate *h)
665 static inline bool hugepage_migration_supported(struct hstate *h)
667 return arch_hugetlb_migration_supported(h);
671 * Movability check is different as compared to migration check.
672 * It determines whether or not a huge page should be placed on
673 * movable zone or not. Movability of any huge page should be
674 * required only if huge page size is supported for migration.
675 * There wont be any reason for the huge page to be movable if
676 * it is not migratable to start with. Also the size of the huge
677 * page should be large enough to be placed under a movable zone
678 * and still feasible enough to be migratable. Just the presence
679 * in movable zone does not make the migration feasible.
681 * So even though large huge page sizes like the gigantic ones
682 * are migratable they should not be movable because its not
683 * feasible to migrate them from movable zone.
685 static inline bool hugepage_movable_supported(struct hstate *h)
687 if (!hugepage_migration_supported(h))
690 if (hstate_is_gigantic(h))
695 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
696 struct mm_struct *mm, pte_t *pte)
698 if (huge_page_size(h) == PMD_SIZE)
699 return pmd_lockptr(mm, (pmd_t *) pte);
700 VM_BUG_ON(huge_page_size(h) == PAGE_SIZE);
701 return &mm->page_table_lock;
704 #ifndef hugepages_supported
706 * Some platform decide whether they support huge pages at boot
707 * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
708 * when there is no such support
710 #define hugepages_supported() (HPAGE_SHIFT != 0)
713 void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
715 static inline void hugetlb_count_add(long l, struct mm_struct *mm)
717 atomic_long_add(l, &mm->hugetlb_usage);
720 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
722 atomic_long_sub(l, &mm->hugetlb_usage);
725 #ifndef set_huge_swap_pte_at
726 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
727 pte_t *ptep, pte_t pte, unsigned long sz)
729 set_huge_pte_at(mm, addr, ptep, pte);
733 #ifndef huge_ptep_modify_prot_start
734 #define huge_ptep_modify_prot_start huge_ptep_modify_prot_start
735 static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma,
736 unsigned long addr, pte_t *ptep)
738 return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
742 #ifndef huge_ptep_modify_prot_commit
743 #define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit
744 static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
745 unsigned long addr, pte_t *ptep,
746 pte_t old_pte, pte_t pte)
748 set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
752 #else /* CONFIG_HUGETLB_PAGE */
755 static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
762 static inline struct page *alloc_huge_page_node(struct hstate *h, int nid)
767 static inline struct page *
768 alloc_huge_page_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask)
773 static inline struct page *alloc_huge_page_vma(struct hstate *h,
774 struct vm_area_struct *vma,
775 unsigned long address)
780 static inline int __alloc_bootmem_huge_page(struct hstate *h)
785 static inline struct hstate *hstate_file(struct file *f)
790 static inline struct hstate *hstate_sizelog(int page_size_log)
795 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
800 static inline struct hstate *page_hstate(struct page *page)
805 static inline unsigned long huge_page_size(struct hstate *h)
810 static inline unsigned long huge_page_mask(struct hstate *h)
815 static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
820 static inline unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
825 static inline unsigned int huge_page_order(struct hstate *h)
830 static inline unsigned int huge_page_shift(struct hstate *h)
835 static inline bool hstate_is_gigantic(struct hstate *h)
840 static inline unsigned int pages_per_huge_page(struct hstate *h)
845 static inline unsigned hstate_index_to_shift(unsigned index)
850 static inline int hstate_index(struct hstate *h)
855 static inline pgoff_t basepage_index(struct page *page)
860 static inline int dissolve_free_huge_page(struct page *page)
865 static inline int dissolve_free_huge_pages(unsigned long start_pfn,
866 unsigned long end_pfn)
871 static inline bool hugepage_migration_supported(struct hstate *h)
876 static inline bool hugepage_movable_supported(struct hstate *h)
881 static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
882 struct mm_struct *mm, pte_t *pte)
884 return &mm->page_table_lock;
887 static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
891 static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
895 static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
896 pte_t *ptep, pte_t pte, unsigned long sz)
899 #endif /* CONFIG_HUGETLB_PAGE */
901 static inline spinlock_t *huge_pte_lock(struct hstate *h,
902 struct mm_struct *mm, pte_t *pte)
906 ptl = huge_pte_lockptr(h, mm, pte);
911 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)
912 extern void __init hugetlb_cma_reserve(int order);
913 extern void __init hugetlb_cma_check(void);
915 static inline __init void hugetlb_cma_reserve(int order)
918 static inline __init void hugetlb_cma_check(void)
923 #endif /* _LINUX_HUGETLB_H */