Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Housekeeping. Update for maintainers who have handed in their commit bits
or (in my case) no longer feel that oversight is necessary.

o Remove @- from the ln and change it to a -sf. This was bogus, and
regocnized as such at the time. Now that the other bogons in the
tree have been fixed, we can remove this ugly kludge.
o Remove stale/bogus opt_foo.h files. These are left over from
by-gone resources. And they point to the need, yet again, to
improve the build system so meta information is only in one place.

Submitted by: ru
Reviewed by: bde
Approved by: re@ (jhb)

Drop <bsd.man.mk> support from <bsd.kmod.mk>.

Not objected to by: -current

Export symbols that constitute APIs defined by these
modules.

Note that in the case of 'mii' the API is not clearly
defined, and the symbols exported represent a subset
defined by current usage.

Use a consistent style and one much closer to the rest of /usr/src

Avoid the modules madness I inadvertently introduced by making the
cloning infrastructure standard in kern_conf. Modules are now
the same with or without devfs support.

If you need to detect if devfs is present, in modules or elsewhere,
check the integer variable "devfs_present".

This happily removes an ugly hack from kern/vfs_conf.c.

This forces a rename of the eventhandler and the standard clone
helper function.

Include <sys/eventhandler.h> in <sys/conf.h>: it's a helper #include
like <sys/queue.h>

Remove all #includes of opt_devfs.h they no longer matter.

Use .include <bsd.kmod.mk> to get to ../../*/conf/kmod.mk instead of
encoding the relative path.

Pull in sys/conf/kmod.mk, rather than /usr/share/mk/bsd.kmod.mk.
This means that the kernel can be totally self contained now and is not
dependent on the last buildworld to update /usr/share/mk. This might
also make it easier to build 5.x kernels on 4.0 boxes etc, assuming
gensetdefs and config(8) are updated.

Removed special rules for building and cleaning device interface files
and empty options files. The rules are now generated automatically in
bsd.kmod.mk. Cleaned up related things ($S and ${CLEANFILES}).

Zap some unused echo "#define NFOO 1" > foo.h style defunct stuff.

$Id$ -> $FreeBSD$

Oops. Adding a Makefile might help anyone who wants to use streams
as a module...