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[0/2] nodemask: Use nr_node_ids

Message ID 20230802112458.230221601@infradead.org
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Series nodemask: Use nr_node_ids |

Message

Peter Zijlstra Aug. 2, 2023, 11:24 a.m. UTC 
  Hi,

While working on some NUMA code recently, I stumbled over how nodemask
operations are unconditionally using MAX_NUMNODES length, which is typically
1024 for distro configs.

OTOH typical machines only have <=4 nodes, so doing these crazy long bitmap ops
is silly.

Therefore do as cpumask does and use nr_node_ids analogous to nr_cpu_ids.

These patches are lightly tested -- as in they seem to boot on a 2 node system.