thp: fix bad_page to show the real reason the page is bad
Andrea Arcangeli [Thu, 13 Jan 2011 23:46:29 +0000 (15:46 -0800)]
page_count shows the count of the head page, but the actual check is done
on the tail page, so show what is really being checked.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/page_alloc.c

index c18d1f7..2a67c3b 100644 (file)
@@ -5618,7 +5618,7 @@ void dump_page(struct page *page)
 {
        printk(KERN_ALERT
               "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
-               page, page_count(page), page_mapcount(page),
+               page, atomic_read(&page->_count), page_mapcount(page),
                page->mapping, page->index);
        dump_page_flags(page->flags);
 }