linux-kernel - [PATCH] [29/50] x86: honor _PAGE

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Message-Id: <20070921223228.B2DD313DCD@wotan.suse.de>
Date:	Sat, 22 Sep 2007 00:32:28 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	jbeulich@...ell.com, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [29/50] x86: honor _PAGE_PSE bit on page walks


From: "Jan Beulich" <jbeulich@...ell.com>
Signed-off-by: Jan Beulich <jbeulich@...ell.com>
Signed-off-by: Andi Kleen <ak@...e.de>

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

Index: linux/arch/i386/mm/fault.c
===================================================================
--- linux.orig/arch/i386/mm/fault.c
+++ linux/arch/i386/mm/fault.c
@@ -569,7 +569,8 @@ 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)];
Index: linux/arch/x86_64/mm/fault.c
===================================================================
--- linux.orig/arch/x86_64/mm/fault.c
+++ linux/arch/x86_64/mm/fault.c
@@ -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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