Message ID | 20230130214352.40538-2-vishal.moola@gmail.com |
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State | New |
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Series |
Convert a couple migrate functions to use folios
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Commit Message
Vishal Moola
Jan. 30, 2023, 9:43 p.m. UTC
folio_get_nontail_page() returns the folio associated with a head
page. This is necessary for folio conversions where the behavior of that
function differs between head pages and tail pages.
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
---
include/linux/mm.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h index dd295c020e85..5da260346406 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -879,6 +879,13 @@ static inline bool get_page_unless_zero(struct page *page) return page_ref_add_unless(page, 1, 0); } +static inline struct folio *folio_get_nontail_page(struct page *page) +{ + if (unlikely(!get_page_unless_zero(page))) + return NULL; + return (struct folio *)page; +} + extern int page_is_ram(unsigned long pfn); enum {