x86: fix ioremap pgprot inconsistency

The pgprot flags which are handed into ioremap_page_range() are
different to those which are set in change_page_attr(). The
ioremap_page_range flags are executable, while the c_p_a flags are
not. Also make the mappings global (which is a NOP currently on 32bit,
although CPUs from PPRO+ onwards support it, but that's a separate
fix.)
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/mm/ioremap_32.c

@@ -67,8 +67,7 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 				return NULL;
 	}
 
-	prot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY
-			| _PAGE_ACCESSED | flags);
+	prot = MAKE_GLOBAL(__PAGE_KERNEL | flags);
 
 	/*
 	 * Mappings have to be page-aligned