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mm: introduce compound_nr()

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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>
This commit is contained in:
Matthew Wilcox (Oracle)
2019-09-23 15:34:30 -07:00
committed by Linus Torvalds
parent 94ad933810
commit d8c6546b1a
18 changed files with 30 additions and 25 deletions
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6
include/linux/mm.h
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@@ -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)
{