svn commit: r313394 - head/sys/kern

[Bruce Evans]

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