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mm: Add folio_pfn()

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This is the folio equivalent of page_to_pfn().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-05-07 10:55:27 -04:00
parent c5ce619a77
commit bf6bd276b3
1 changed files with 14 additions and 0 deletions
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14
include/linux/mm.h
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@ -1624,6 +1624,20 @@ static inline unsigned long page_to_section(const struct page *page)
}
#endif
/**
* folio_pfn - Return the Page Frame Number of a folio.
* @folio: The folio.
*
* A folio may contain multiple pages. The pages have consecutive
* Page Frame Numbers.
*
* Return: The Page Frame Number of the first page in the folio.
*/
static inline unsigned long folio_pfn(struct folio *folio)
{
return page_to_pfn(&folio->page);
}
/* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */
#ifdef CONFIG_MIGRATION
static inline bool is_pinnable_page(struct page *page)