Commit 0bb2c763 authored by Gavin Shan's avatar Gavin Shan Committed by Linus Torvalds
Browse files

mm/page_alloc.c: remove duplicate check



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: default avatarGavin Shan <shangw@linux.vnet.ibm.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3012d60b
......@@ -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++;
}
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment