x86: provide a bad_dma_address symbol for i386
It's initially 0, since we don't expect any DMA there. Signed-off-by: NGlauber Costa <gcosta@redhat.com> Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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