From: Andi Kleen <ak@suse.de>
Date: Wed, 30 Jan 2008 12:33:52 +0000 (+0100)
Subject: x86: c_p_a() make it more robust against use of PAT bits
X-Git-Tag: v2.6.25-rc1~1143^2~112
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=895bdc29956e5c9e9e101b2b1c2f0ed34130f945;p=linux-2.6-omap-h63xx.git

x86: c_p_a() make it more robust against use of PAT bits

Use the page table level instead of the PSE bit to check if the PTE
is for a 4K page or not. This makes the code more robust when the PAT
bit is changed because the PAT bit on 4K pages is in the same position
as the PSE bit.

Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/arch/x86/mm/pageattr_32.c b/arch/x86/mm/pageattr_32.c
index 5cb5c7101f4..66688a63083 100644
--- a/arch/x86/mm/pageattr_32.c
+++ b/arch/x86/mm/pageattr_32.c
@@ -172,7 +172,7 @@ static int __change_page_attr(struct page *page, pgprot_t prot)
 	BUG_ON(PageCompound(kpte_page));
 
 	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) {
-		if (!pte_huge(*kpte)) {
+		if (level == 3) {
 			set_pte_atomic(kpte, mk_pte(page, prot));
 		} else {
 			struct page *split;
@@ -190,7 +190,7 @@ static int __change_page_attr(struct page *page, pgprot_t prot)
 		}
 		page_private(kpte_page)++;
 	} else {
-		if (!pte_huge(*kpte)) {
+		if (level == 3) {
 			set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL));
 			BUG_ON(page_private(kpte_page) == 0);
 			page_private(kpte_page)--;
diff --git a/arch/x86/mm/pageattr_64.c b/arch/x86/mm/pageattr_64.c
index 3ccdb1401e6..73dbbb4048e 100644
--- a/arch/x86/mm/pageattr_64.c
+++ b/arch/x86/mm/pageattr_64.c
@@ -153,7 +153,7 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
 	BUG_ON(PageLRU(kpte_page));
 	BUG_ON(PageCompound(kpte_page));
 	if (pgprot_val(prot) != pgprot_val(ref_prot)) {
-		if (!pte_huge(*kpte)) {
+		if (level == 4) {
 			set_pte(kpte, pfn_pte(pfn, prot));
 		} else {
 			/*
@@ -172,7 +172,7 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
 		}
 		page_private(kpte_page)++;
 	} else {
-		if (!pte_huge(*kpte)) {
+		if (level == 4) {
 			set_pte(kpte, pfn_pte(pfn, ref_prot));
 			BUG_ON(page_private(kpte_page) == 0);
 			page_private(kpte_page)--;