diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2019-09-24 01:34:25 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-25 01:54:08 +0300 |
| commit | a50b854e073cd3335bbbada8dcff83a857297dd7 (patch) | |
| tree | 2ffc3a1e603860d6c0acc00154b47080c567c9c6 /include/linux/mm.h | |
| parent | 1f18b296699c83d858ca8ebb8b77dbc641d87cae (diff) | |
| download | linux-a50b854e073cd3335bbbada8dcff83a857297dd7.tar.xz | |
mm: introduce page_size()
Patch series "Make working with compound pages easier", v2.
These three patches add three helpers and convert the appropriate
places to use them.
This patch (of 3):
It's unnecessarily hard to find out the size of a potentially huge page.
Replace 'PAGE_SIZE << compound_order(page)' with page_size(page).
Link: http://lkml.kernel.org/r/20190721104612.19120-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Michal Hocko <mhocko@suse.com>
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
| -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 6e79b3df1582..d46d5585e2a2 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 bytes in this potentially compound page. */ +static inline unsigned long page_size(struct page *page) +{ + return PAGE_SIZE << compound_order(page); +} + void free_compound_page(struct page *page); #ifdef CONFIG_MMU |