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BACKPORT: mm: introduce page_size()

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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>
(cherry picked from commit a50b854e073cd3335bbbada8dcff83a857297dd7)

Change-Id: Ic8f9fcab6c6dba7b98e2e218728cbcb134869bbc
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
This commit is contained in:
Matthew Wilcox (Oracle)
2019-09-23 15:34:25 -07:00
committed by Tao Huang
parent 0b26b5304d
commit b51d395d4f
1 changed files with 6 additions and 0 deletions
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6
include/linux/mm.h
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@ -736,6 +736,12 @@ static inline void set_compound_order(struct page *page, unsigned int order)
page[1].compound_order = 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); void free_compound_page(struct page *page);
#ifdef CONFIG_MMU #ifdef CONFIG_MMU