NR_CPUS limits the number of CPUs supported to 8. This makes total sense
on hardware-restircted platforms, but not on x86_64, where CPUs with
more than 8 cores can be easily acquired and with less physical limitaions.
see also: https://forum.openwrt.org/t/x86-64-8-cpu-limitation-on-vanilla-release/100946
Signed-off-by: Edgar Su <sjs333@outlook.com>
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