mm/page_alloc.c: remove duplicate check
Gavin Shan [Tue, 18 Dec 2012 22:21:32 +0000 (14:21 -0800)]
While allocating pages using buddy allocator, the compound page is
probably split up to free pages.  Under these circumstances, the compound
page should be destroyed by destroy_compound_page().  However, there is a
duplicate check to judge if the page is compound.

Remove the duplicate check since the compound_order() returns 0 when the
page doesn't have PG_head set in destroy_compound_page().  That is to say,
destroy_compound_page() needn't check PageHead().

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/page_alloc.c

index d037c8b..62496ed 100644 (file)
@@ -371,8 +371,7 @@ static int destroy_compound_page(struct page *page, unsigned long order)
        int nr_pages = 1 << order;
        int bad = 0;
 
-       if (unlikely(compound_order(page) != order) ||
-           unlikely(!PageHead(page))) {
+       if (unlikely(compound_order(page) != order)) {
                bad_page(page);
                bad++;
        }