x86: increase MAX_APICS for very large x86-64 configs
Increase the maximum number of apics when running very large configurations. This patch has no affect on most systems. The patch has no effect on any 32-bit kernel. It adds ~4k to the size of 64-bit kernels but only if NR_CPUS > 255. Signed-off-by: NJack Steiner <steiner@sgi.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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