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    Subject[PATCH v12 03/33] mm: Add folio_pgdat(), folio_zone() and folio_zonenum()
    Date
    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>
    ---
    include/linux/mm.h | 15 +++++++++++++++
    1 file changed, 15 insertions(+)

    diff --git a/include/linux/mm.h b/include/linux/mm.h
    index cba7bc223a9b..f0025bd2c2ad 100644
    --- a/include/linux/mm.h
    +++ b/include/linux/mm.h
    @@ -1145,6 +1145,11 @@ static inline enum zone_type page_zonenum(const struct page *page)
    return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
    }

    +static inline enum zone_type folio_zonenum(const struct folio *folio)
    +{
    + return page_zonenum(&folio->page);
    +}
    +
    #ifdef CONFIG_ZONE_DEVICE
    static inline bool is_zone_device_page(const struct page *page)
    {
    @@ -1560,6 +1565,16 @@ static inline pg_data_t *page_pgdat(const struct page *page)
    return NODE_DATA(page_to_nid(page));
    }

    +static inline struct zone *folio_zone(const struct folio *folio)
    +{
    + return page_zone(&folio->page);
    +}
    +
    +static inline pg_data_t *folio_pgdat(const struct folio *folio)
    +{
    + return page_pgdat(&folio->page);
    +}
    +
    #ifdef SECTION_IN_PAGE_FLAGS
    static inline void set_page_section(struct page *page, unsigned long section)
    {
    --
    2.30.2
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