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Commit 1aa8aea5 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
Browse files

mm: uninline page_mapped() 



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

[akpm@linux-foundation.org: coding-style fixes]
Cc: Steve Capper <steve.capper@arm.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 29f9cb53

include/linux/mm.h

+1 −20
Original line number Diff line number Diff line
@@ -1032,26 +1032,7 @@ static inline pgoff_t page_file_index(struct page *page) 
	return page->index;

}



/*

 * Return true if this page is mapped into pagetables.

 * For compound page it returns true if any subpage of compound page is mapped.

 */

static inline 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;

}

bool page_mapped(struct page *page);



/*

 * Return true only if the page has been allocated with

mm/util.c

+23 −0
Original line number Diff line number Diff line
@@ -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;