Commit 6416b9fa authored by Wang Sheng-Hui's avatar Wang Sheng-Hui Committed by Jiri Kosina
Browse files

mm: cleanup the comment for head/tail pages of compound pages in mm/page_alloc.c 



Only tail pages point at the head page using their ->first_page fields.

Signed-off-by: default avatarWang Sheng-Hui <shhuiw@gmail.com>
Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 7433f2b7

mm/page_alloc.c

+2 −2
Original line number Diff line number Diff line
@@ -333,8 +333,8 @@ static void bad_page(struct page *page) 
 *

 * The remaining PAGE_SIZE pages are called "tail pages".

 *

 * All pages have PG_compound set.  All pages have their ->private pointing at

 * the head page (even the head page has this).

 * All pages have PG_compound set.  All tail pages have their ->first_page

 * pointing at the head page.

 *

 * The first tail page's ->lru.next holds the address of the compound page's

 * put_page() function.  Its ->lru.prev holds the order of allocation.