[PATCH] NX: Triple fault with 4k kernel mappings and PAE

Booting with NX, CONFIG_X86_PAE and CONFIG_DEBUG_PAGEALLOC or mem=nopentium
triple faults really early during boot as it appears to be tripping over
pages from PAGE_OFFSET -> PAGE_OFFSET + 0x100000 not being marked as
executable.
Signed-off-by: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/mm/init.c

@@ -130,7 +130,7 @@ static void __init page_table_range_init (unsigned long start, unsigned long end
 
 static inline int is_kernel_text(unsigned long addr)
 {
-	if (addr >= (unsigned long)_stext && addr <= (unsigned long)__init_end)
+	if (addr >= PAGE_OFFSET && addr <= (unsigned long)__init_end)
 		return 1;
 	return 0;
 }