x86: move x86_64-specific to common code.
This patch moves the bootmem functions, that are largely x86_64-specific into pci-dma.c. The code goes inside an ifdef. 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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