From 94ad9338109fe9d0b8a4a16828719dd6dcaee4c2 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Mon, 23 Sep 2019 15:34:28 -0700 Subject: mm: introduce page_shift() Replace PAGE_SHIFT + compound_order(page) with the new page_shift() function. Minor improvements in readability. [akpm@linux-foundation.org: fix build in tce_page_is_contained()] Link: http://lkml.kernel.org/r/201907241853.yNQTrJWd%25lkp@intel.com Link: http://lkml.kernel.org/r/20190721104612.19120-3-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Andrew Morton Reviewed-by: Ira Weiny Acked-by: Kirill A. Shutemov Cc: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mm.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/linux') diff --git a/include/linux/mm.h b/include/linux/mm.h index d46d5585e2a2..9238548bdec5 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -811,6 +811,12 @@ static inline unsigned long page_size(struct page *page) return PAGE_SIZE << compound_order(page); } +/* Returns the number of bits needed for the number of bytes in a page */ +static inline unsigned int page_shift(struct page *page) +{ + return PAGE_SHIFT + compound_order(page); +} + void free_compound_page(struct page *page); #ifdef CONFIG_MMU -- cgit v1.2.3