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mm: Add folio_pgdat(), folio_zone() and folio_zonenum()
These are just convenience wrappers for callers with folios; pgdat and zone can be reached from tail pages as well as head pages. No change to generated code. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Jeff Layton <jlayton@kernel.org> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: William Kucharski <william.kucharski@oracle.com> Reviewed-by: David Howells <dhowells@redhat.com> Acked-by: Mike Rapoport <rppt@linux.ibm.com>
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@ -1145,6 +1145,11 @@ static inline enum zone_type page_zonenum(const struct page *page)
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return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
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}
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static inline enum zone_type folio_zonenum(const struct folio *folio)
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{
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return page_zonenum(&folio->page);
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}
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#ifdef CONFIG_ZONE_DEVICE
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static inline bool is_zone_device_page(const struct page *page)
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{
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@ -1560,6 +1565,16 @@ static inline pg_data_t *page_pgdat(const struct page *page)
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return NODE_DATA(page_to_nid(page));
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}
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static inline struct zone *folio_zone(const struct folio *folio)
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{
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return page_zone(&folio->page);
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}
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static inline pg_data_t *folio_pgdat(const struct folio *folio)
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{
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return page_pgdat(&folio->page);
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}
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#ifdef SECTION_IN_PAGE_FLAGS
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static inline void set_page_section(struct page *page, unsigned long section)
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{
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