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When PLATFORM_SMP is enabled, check if tunable hw.ncpu is set and valid

Description

When PLATFORM_SMP is enabled, check if tunable hw.ncpu is set and valid
(>= 1 and <= real ncores) and set mp_ncpus to it.

Approved by: andrew (mentor)
Differential Revision: https://reviews.freebsd.org/D6151

Details

Provenance
manuAuthored on
Differential Revision
D6151: PLATFORM arm honor hw.ncpu tunable
Parents
rS299382: Update the example growfs(8) manual page to include information on how
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