From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>
Commit f8f9f21c7848 ("MIPS: Fix build error for loongson64 and
sgi-ip27") added HAVE_ARCH_NODEDATA_EXTENSION to sgi-ip27 to silence a
compilation error that happened because sgi-ip27 didn't define array of
pg_data_t as node_data like most other architectures did.
After addition of node_data array that matches other architectures and
after ensuring that offline nodes do not appear on node_possible_map, it
is safe to drop arch_alloc_nodedata() and HAVE_ARCH_NODEDATA_EXTENSION
from sgi-ip27.
Signed-off-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
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