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mm: Add folio_pincount_ptr()

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This is the folio equivalent of compound_pincount_ptr().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-12-27 18:28:58 -05:00
parent 5232c63f46
commit 3d11b225ae
1 changed files with 5 additions and 0 deletions
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5
include/linux/mm.h
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@ -1544,6 +1544,11 @@ static inline unsigned long folio_pfn(struct folio *folio)
return page_to_pfn(&folio->page);
}
static inline atomic_t *folio_pincount_ptr(struct folio *folio)
{
return &folio_page(folio, 1)->compound_pincount;
}
/* MIGRATE_CMA and ZONE_MOVABLE do not allow pin pages */
#ifdef CONFIG_MIGRATION
static inline bool is_pinnable_page(struct page *page)