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Make the sysctl machdep.idle also a tunable.

Description

Make the sysctl machdep.idle also a tunable.

It is applied before it is possible for idle threads to execute on any
CPU, allowing to work around against some bugs.

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Details

Provenance
kibAuthored on
Parents
rS332972: Extend ap_boot_mtx scope to also cover mca_init().
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