[ARM] 3734/1: Fix the unused variable warning in __iounmap()

Patch from Catalin Marinas

This patch adds #ifdef around some variables in the arch/arm/mm/ioremap.c
file.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/ioremap.c

@@ -363,7 +363,9 @@ EXPORT_SYMBOL(__ioremap);
 
 void __iounmap(void __iomem *addr)
 {
+#ifndef CONFIG_SMP
 	struct vm_struct **p, *tmp;
+#endif
 	unsigned int section_mapping = 0;
 
 	addr = (void __iomem *)(PAGE_MASK & (unsigned long)addr);