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Date: Sat, 28 Aug 2004 00:41:59 -0700
From: Julian Elischer <julian@elischer.org>
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Subject: hlt_cpus_mask
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This is defined static in i386 and amd64,
but as it is not exported it can not be used in
subr_smp.c, which probably should mask against it when trying to
forward roundrobin and signals.

should this be a globally available thing?
Otherwise we are sending IPIs to threads that are
not capable of doing anything with them.