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x86: stricter check in follow_huge_addr() 

The first page of the compound page is determined in follow_huge_addr()
but then PageCompound() only checks if the page is part of a compound page.
PageHead() allows checking if this is indeed the first page of the
compound.

Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Christoph Lameter 2008-03-26 21:03:04 -07:00 committed by Ingo Molnar
parent b2ef749720
commit 25e59881f1
1 changed files with 1 additions and 1 deletions
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2
arch/x86/mm/hugetlbpage.c
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@ -178,7 +178,7 @@ follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)];
WARN_ON(!PageCompound(page));
WARN_ON(!PageHead(page));
return page;
}