* [PATCH 1/4] x86: check __supported_pte_mask in set_memory_x/nx
@ 2008-02-01 9:34 Huang, Ying
0 siblings, 0 replies; only message in thread
From: Huang, Ying @ 2008-02-01 9:34 UTC (permalink / raw)
To: Ingo Molnar, H. Peter Anvin, Thomas Gleixner, Andi Kleen; +Cc: linux-kernel
This patch adds __supported_pte_mask checking to set_memory_x/nx.
Signed-off-by: Huang Ying <ying.huang@intel.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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