28 extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
54  * @pgprot: page protection to use
73  * @pgprot: page protection to use
186 extern void prep_transhuge_page(struct page *page);
187 extern void free_transhuge_page(struct page *page);
188 bool is_transparent_hugepage(struct page *page);
190 bool can_split_huge_page(struct page *page, int *pextra_pins);
191 int split_huge_page_to_list(struct page *page, struct list_head *list);
192 static inline int split_huge_page(struct page *page)  in split_huge_page()  argument
194 	return split_huge_page_to_list(page, NULL);  in split_huge_page()
196 void deferred_split_huge_page(struct page *page);
199 		unsigned long address, bool freeze, struct page *page);
212 		bool freeze, struct page *page);
260  * thp_head - Head page of a transparent huge page.
261  * @page: Any page (tail, head or regular) found in the page cache.
263 static inline struct page *thp_head(struct page *page)  in thp_head()  argument
265 	return compound_head(page);  in thp_head()
269  * thp_order - Order of a transparent huge page.
270  * @page: Head page of a transparent huge page.
272 static inline unsigned int thp_order(struct page *page)  in thp_order()  argument
274 	VM_BUG_ON_PGFLAGS(PageTail(page), page);  in thp_order()
275 	if (PageHead(page))  in thp_order()
281  * thp_nr_pages - The number of regular pages in this huge page.
282  * @page: The head page of a huge page.
284 static inline int thp_nr_pages(struct page *page)  in thp_nr_pages()  argument
286 	VM_BUG_ON_PGFLAGS(PageTail(page), page);  in thp_nr_pages()
287 	if (PageHead(page))  in thp_nr_pages()
292 struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
294 struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
299 extern struct page *huge_zero_page;
301 static inline bool is_huge_zero_page(struct page *page)  in is_huge_zero_page()  argument
303 	return READ_ONCE(huge_zero_page) == page;  in is_huge_zero_page()
316 struct page *mm_get_huge_zero_page(struct mm_struct *mm);
319 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))  argument
326 static inline struct list_head *page_deferred_list(struct page *page)  in page_deferred_list()  argument
332 	return &page[2].deferred_list;  in page_deferred_list()
344 static inline struct page *thp_head(struct page *page)  in thp_head()  argument
346 	VM_BUG_ON_PGFLAGS(PageTail(page), page);  in thp_head()
347 	return page;  in thp_head()
350 static inline unsigned int thp_order(struct page *page)  in thp_order()  argument
352 	VM_BUG_ON_PGFLAGS(PageTail(page), page);  in thp_order()
356 static inline int thp_nr_pages(struct page *page)  in thp_nr_pages()  argument
358 	VM_BUG_ON_PGFLAGS(PageTail(page), page);  in thp_nr_pages()
378 static inline void prep_transhuge_page(struct page *page) {}  in prep_transhuge_page()  argument
380 static inline bool is_transparent_hugepage(struct page *page)  in is_transparent_hugepage()  argument
390 can_split_huge_page(struct page *page, int *pextra_pins)  in can_split_huge_page()  argument
396 split_huge_page_to_list(struct page *page, struct list_head *list)  in split_huge_page_to_list()  argument
400 static inline int split_huge_page(struct page *page)  in split_huge_page()  argument
404 static inline void deferred_split_huge_page(struct page *page) {}  in deferred_split_huge_page()  argument
409 		unsigned long address, bool freeze, struct page *page) {}  in __split_huge_pmd()  argument
411 		unsigned long address, bool freeze, struct page *page) {}  in split_huge_pmd_address()  argument
449 static inline bool is_huge_zero_page(struct page *page)  in is_huge_zero_page()  argument
464 static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,  in follow_devmap_pmd()
470 static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,  in follow_devmap_pud()
483  * thp_size - Size of a transparent huge page.
484  * @page: Head page of a transparent huge page.
486  * Return: Number of bytes in this page.
488 static inline unsigned long thp_size(struct page *page)  in thp_size()  argument
490 	return PAGE_SIZE << thp_order(page);  in thp_size()