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mm/hwpoison: don't need to hold compound lock for hugetlbfs page

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compound lock is introduced by commit e9da73d67("thp: compound_lock."), it
is used to serialize put_page against __split_huge_page_refcount().  In
addition, transparent hugepages will be splitted in hwpoison handler and
just one subpage will be poisoned.  There is unnecessary to hold compound
lock for hugetlbfs page.  This patch replace compound_trans_order by
compond_order in the place where the page is hugetlbfs page.

Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wanpeng Li 2013-09-11 14:22:52 -07:00 • committed by Linus Torvalds
commit f9121153fd
2 changed files with 6 additions and 20 deletions
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14
include/linux/mm.h
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@ -495,20 +495,6 @@ static inline int compound_order(struct page *page)
return (unsigned long)page[1].lru.prev;
}
static inline int compound_trans_order(struct page *page)
{
int order;
unsigned long flags;
if (!PageHead(page))
return 0;
flags = compound_lock_irqsave(page);
order = compound_order(page);
compound_unlock_irqrestore(page, flags);
return order;
}
static inline void set_compound_order(struct page *page, unsigned long order)
{
page[1].lru.prev = (void *)order;