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mm: uninline page_mapped()

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It's huge.  Uninlining it saves 206 bytes per callsite.  Shaves 4924
bytes from the x86_64 allmodconfig vmlinux.

[[email protected]: coding-style fixes]
Cc: Steve Capper <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrew Morton 2016-05-19 17:12:00 -07:00 • committed by Linus Torvalds
commit 1aa8aea535
2 changed files with 24 additions and 20 deletions
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23
mm/util.c
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@ -346,6 +346,29 @@ void *page_rmapping(struct page *page)
return __page_rmapping(page);
}
/*
* Return true if this page is mapped into pagetables.
* For compound page it returns true if any subpage of compound page is mapped.
*/
bool page_mapped(struct page *page)
{
int i;
if (likely(!PageCompound(page)))
return atomic_read(&page->_mapcount) >= 0;
page = compound_head(page);
if (atomic_read(compound_mapcount_ptr(page)) >= 0)
return true;
if (PageHuge(page))
return false;
for (i = 0; i < hpage_nr_pages(page); i++) {
if (atomic_read(&page[i]._mapcount) >= 0)
return true;
}
return false;
}
EXPORT_SYMBOL(page_mapped);
struct anon_vma *page_anon_vma(struct page *page)
{
unsigned long mapping;