From c70b647d381cba1899c953b0016b7dc185892f90 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Mon, 12 Dec 2016 16:43:17 -0800 Subject: [PATCH] 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 Acked-by: Johannes Weiner Cc: Jan Kara Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/filemap.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/filemap.c b/mm/filemap.c index 50b52fe51937..caa779f8797f 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -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); -- 2.20.1