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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: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Roman Gushchin <guro@fb.com>
This commit is contained in:
Vlastimil Babka 2021-11-25 18:15:37 +01:00
parent a7904a5389
commit 7d4203c134
1 changed files with 12 additions and 0 deletions
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12
include/linux/mm.h
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@ -863,6 +863,13 @@ static inline struct page *virt_to_head_page(const void *x)
return compound_head(page); 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_page(struct page *page);
void put_pages_list(struct list_head *pages); void put_pages_list(struct list_head *pages);
@ -1753,6 +1760,11 @@ void page_address_init(void);
#define page_address_init() do { } while(0) #define page_address_init() do { } while(0)
#endif #endif
static inline void *folio_address(const struct folio *folio)
{
return page_address(&folio->page);
}
extern void *page_rmapping(struct page *page); extern void *page_rmapping(struct page *page);
extern struct anon_vma *page_anon_vma(struct page *page); extern struct anon_vma *page_anon_vma(struct page *page);
extern pgoff_t __page_file_index(struct page *page); extern pgoff_t __page_file_index(struct page *page);