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Date: Wed, 8 Feb 2017 12:31:46 +1100 (EST)
From: Bruce Evans <brde@optusnet.com.au>
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To: Emmanuel Vadot <manu@freebsd.org>
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Subject: Re: svn commit: r313394 - head/sys/kern
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On Tue, 7 Feb 2017, Emmanuel Vadot wrote:

> Log:
>  subr_sfbus.c need sys/proc.h for struct thread definition.
>  This fixes kernel build for armv6.
>
>  Discussed with: kib

sys/proc.h was accidentally (?) provided by gross namespace pollution
on some arches (perhaps on all the arches that use subr_sfbuf.c) in
<machine/counter.h>.  This pollution is only supplied under INVARIANTS,
so it is not completely accidental.  However, at least on i386, sys/proc.h
and its nested pollution isn't even used for anything except to pollute.

<machine/counter.h> has lots of other undocumented pollution which is
actually partially used (mainly sys/pcpu.h and its pollution).

Bruce