Commit 7d4203c1 authored by Vlastimil Babka's avatar Vlastimil Babka
Browse files

mm: add virt_to_folio() and folio_address() 



These two wrappers around their respective struct page variants will be
useful in the following patches.

Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Reviewed-by: default avatarRoman Gushchin <guro@fb.com>
parent a7904a53

include/linux/mm.h

+12 −0
Original line number Diff line number Diff line
@@ -863,6 +863,13 @@ static inline struct page *virt_to_head_page(const void *x) 
	return compound_head(page);

}



static inline struct folio *virt_to_folio(const void *x)

{

	struct page *page = virt_to_page(x);



	return page_folio(page);

}



void __put_page(struct page *page);



void put_pages_list(struct list_head *pages);
@@ -1753,6 +1760,11 @@ void page_address_init(void); 
#define page_address_init()  do { } while(0)

#endif



static inline void *folio_address(const struct folio *folio)

{

	return page_address(&folio->page);

}



extern void *page_rmapping(struct page *page);

extern struct anon_vma *page_anon_vma(struct page *page);

extern pgoff_t __page_file_index(struct page *page);