x86: only support sparsemem
sparsemem is only one supported, so could remove FLAT_NODE_MEM related, that is only needed !SPARSEMEM Signed-off-by: Yinghai Lu <yinghai.lu@sun.com> Reviewed-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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