linux-kernel - [PATCH] honor _PAGE

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Date:	Tue, 28 Aug 2007 11:45:50 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Andi Kleen" <ak@...e.de>
Cc:	<linux-kernel@...r.kernel.org>, <patches@...-64.org>
Subject: [PATCH] honor _PAGE_PSE bit on page walks

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

 arch/i386/mm/fault.c   |    3 ++-
 arch/x86_64/mm/fault.c |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

--- linux-2.6.23-rc4/arch/i386/mm/fault.c	2007-08-28 09:41:59.000000000 +0200
+++ 2.6.23-rc4-x86-page-walk-pse/arch/i386/mm/fault.c	2007-08-15 12:20:48.000000000 +0200
@@ -570,7 +570,8 @@ no_context:
 		 * it's allocated already.
 		 */
 		if ((page >> PAGE_SHIFT) < max_low_pfn
-		    && (page & _PAGE_PRESENT)) {
+		    && (page & _PAGE_PRESENT)
+		    && !(page & _PAGE_PSE)) {
 			page &= PAGE_MASK;
 			page = ((__typeof__(page) *) __va(page))[(address >> PAGE_SHIFT)
 			                                         & (PTRS_PER_PTE - 1)];
--- linux-2.6.23-rc4/arch/x86_64/mm/fault.c	2007-08-28 09:42:05.000000000 +0200
+++ 2.6.23-rc4-x86-page-walk-pse/arch/x86_64/mm/fault.c	2007-08-15 12:25:03.000000000 +0200
@@ -175,7 +175,7 @@ void dump_pagetable(unsigned long addres
 	pmd = pmd_offset(pud, address);
 	if (bad_address(pmd)) goto bad;
 	printk("PMD %lx ", pmd_val(*pmd));
-	if (!pmd_present(*pmd))	goto ret;	 
+	if (!pmd_present(*pmd) || pmd_large(*pmd)) goto ret;
 
 	pte = pte_offset_kernel(pmd, address);
 	if (bad_address(pte)) goto bad;



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