Commit c70b647d authored Dec 12, 2016 by Kirill A. Shutemov Committed by Linus Torvalds Dec 12, 2016

mm/filemap.c: add comment for confusing logic in page_cache_tree_insert()

Unlike THP, hugetlb pages are represented by one entry in the
radix-tree.

[akpm@linux-foundation.org: tweak comment]
Link: http://lkml.kernel.org/r/20161110163640.126124-1-kirill.shutemov@linux.intel.com


Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent d5e6eff2

mm/filemap.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -169,7 +169,10 @@ static int page_cache_tree_insert(struct address_space *mapping,
		static void page_cache_tree_delete(struct address_space *mapping,
		struct page page, void shadow)
		{
		int i, nr = PageHuge(page) ? 1 : hpage_nr_pages(page);
		int i, nr;

		/* hugetlb pages are represented by one entry in the radix tree */
		nr = PageHuge(page) ? 1 : hpage_nr_pages(page);

		VM_BUG_ON_PAGE(!PageLocked(page), page);
		VM_BUG_ON_PAGE(PageTail(page), page);