build failure at x86/kernel/pci-dma.c with !CONFIG_PCI

From: Alexander Beregalov
Date: Thu Oct 23 2008 - 19:13:06 EST

arch/x86/kernel/built-in.o: In function `iommu_setup':
pci-dma.c:(.init.text+0x36ad): undefined reference to `forbid_dac'
pci-dma.c:(.init.text+0x36cc): undefined reference to `forbid_dac'
pci-dma.c:(.init.text+0x3711): undefined reference to `forbid_dac

commit 5b6985ce8ec7127b4d60ad450b64ca8b82748a3b
Author: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Date: Thu Oct 16 18:02:32 2008 -0700

intel-iommu: IA64 support
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