linux-kernel - [PATCH 1/4] x86: check __supported_pte_mask in set_memory

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Message-Id: <1201858487.4051.17.camel@caritas-dev.intel.com>
Date:	Fri, 01 Feb 2008 17:34:47 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] x86: check __supported_pte_mask in set_memory_x/nx

This patch adds __supported_pte_mask checking to set_memory_x/nx.

Signed-off-by: Huang Ying <ying.huang@...el.com>

---
 arch/x86/mm/pageattr.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -445,13 +445,21 @@ EXPORT_SYMBOL(set_memory_wb);
 
 int set_memory_x(unsigned long addr, int numpages)
 {
-	return change_page_attr_clear(addr, numpages, __pgprot(_PAGE_NX));
+	if (__supported_pte_mask & _PAGE_NX)
+		return change_page_attr_clear(addr, numpages,
+					      __pgprot(_PAGE_NX));
+	else
+		return 0;
 }
 EXPORT_SYMBOL(set_memory_x);
 
 int set_memory_nx(unsigned long addr, int numpages)
 {
-	return change_page_attr_set(addr, numpages, __pgprot(_PAGE_NX));
+	if (__supported_pte_mask & _PAGE_NX)
+		return change_page_attr_set(addr, numpages,
+					    __pgprot(_PAGE_NX));
+	else
+		return 0;
 }
 EXPORT_SYMBOL(set_memory_nx);
 

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