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Subject[x86] Stricter check in follow_huge_addr()
From: Christoph Lameter <clameter@sgi.com>
Subject: Compound Pages: 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>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
arch/x86/mm/hugetlbpage.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.25-rc5-mm1/arch/x86/mm/hugetlbpage.c
===================================================================
--- linux-2.6.25-rc5-mm1.orig/arch/x86/mm/hugetlbpage.c 2008-03-26 20:43:56.796667401 -0700
+++ linux-2.6.25-rc5-mm1/arch/x86/mm/hugetlbpage.c 2008-03-26 20:44:55.526669888 -0700
@@ -178,7 +178,7 @@ follow_huge_addr(struct mm_struct *mm, u

page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)];

- WARN_ON(!PageCompound(page));
+ WARN_ON(!PageHead(page));

return page;
}

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