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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: 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>
This commit is contained in:
Gavin Shan 2012-12-18 14:21:32 -08:00 committed by Linus Torvalds
parent 3012d60b39
commit 0bb2c7637e
1 changed files with 1 additions and 2 deletions
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3
mm/page_alloc.c
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@ -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++;
}