implement early_io{re,un}map for ia64

Needed for commit 2c992208 ("intel-iommu: Detect DMAR in hyperspace at
probe time.) to build on IA64.

Signed-off-by: Tony Luck <[e-mail]>
Signed-off-by: David Woodhouse <[e-mail]>

arch/ia64/include/asm/io.h

···
 extern void __iomem * ioremap(unsigned long offset, unsigned long size);
 extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
 extern void iounmap (volatile void __iomem *addr);
+extern void __iomem * early_ioremap (unsigned long phys_addr, unsigned long size);
+extern void early_iounmap (volatile void __iomem *addr, unsigned long size);
 
 /*
  * String version of IO memory access ops:

arch/ia64/mm/ioremap.c

···
 }
 
 void __iomem *
+early_ioremap (unsigned long phys_addr, unsigned long size)
+{
+	return __ioremap(phys_addr);
+}
+
+void __iomem *
 ioremap (unsigned long phys_addr, unsigned long size)
 {
 	void __iomem *addr;
···
 	return __ioremap(phys_addr);
 }
 EXPORT_SYMBOL(ioremap_nocache);
+
+void
+early_iounmap (volatile void __iomem *addr, unsigned long size)
+{
+}
 
 void
 iounmap (volatile void __iomem *addr)