If we know we have a folio, we can call get_folio() instead of get_page() and save the overhead of calling compound_head().
Signed-off-by: Matthew Wilcox (Oracle) <wi...@infradead.org> --- include/linux/mm.h | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index a9191dc250a6..02ccb7a09190 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1172,15 +1172,17 @@ static inline bool is_pci_p2pdma_page(const struct page *page) #define page_ref_zero_or_close_to_overflow(page) \ ((unsigned int) page_ref_count(page) + 127u <= 127u) +static inline void get_folio(struct folio *folio) +{ + /* Getting a page requires an already elevated page->_refcount. */ + VM_BUG_ON_PAGE(page_ref_zero_or_close_to_overflow(&folio->page), + &folio->page); + page_ref_inc(&folio->page); +} + static inline void get_page(struct page *page) { - page = compound_head(page); - /* - * Getting a normal page or the head of a compound page - * requires to already have an elevated page->_refcount. - */ - VM_BUG_ON_PAGE(page_ref_zero_or_close_to_overflow(page), page); - page_ref_inc(page); + get_folio(page_folio(page)); } bool __must_check try_grab_page(struct page *page, unsigned int flags); -- 2.29.2