ARM: Fix warning: unused variable 'highmem'

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 4426ee6..ce551ec 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -726,6 +726,8 @@
 			bank->size = VMALLOC_MIN - __va(bank->start);
 		}
 #else
+		bank->highmem = highmem;
+
 		/*
 		 * Check whether this memory bank would entirely overlap
 		 * the vmalloc area.