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| author |   Matthew Wilcox (Oracle) <willy@infradead.org> | 2019-09-23 15:34:30 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-24 15:54:08 -0700 |
| commit | d8c6546b1aea843fbeb4d54a1202f1adda6504be (patch) | |
| tree | 4b0fcc4a1afc9342472d59293b50fce20f2d70e7 /include/linux | |
| parent | mm: introduce page_shift() (diff) | |
| download | linux-dev-d8c6546b1aea843fbeb4d54a1202f1adda6504be.tar.xz linux-dev-d8c6546b1aea843fbeb4d54a1202f1adda6504be.zip | |
mm: introduce compound_nr()
Replace 1 << compound_order(page) with compound_nr(page). Minor
improvements in readability.
Link: http://lkml.kernel.org/r/20190721104612.19120-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mm.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 9238548bdec5..69b7314c8d24 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -805,6 +805,12 @@ static inline void set_compound_order(struct page *page, unsigned int order) page[1].compound_order = order; } +/* Returns the number of pages in this potentially compound page. */ +static inline unsigned long compound_nr(struct page *page) +{ + return 1UL << compound_order(page); +} + /* Returns the number of bytes in this potentially compound page. */ static inline unsigned long page_size(struct page *page) { |