Cleanup sctp_send_initiate() and sctp_send_initiate_ack() to be
in sync as much as possible. This simplifies upcoming changes.
Rename files: keep codename only to make it shorter.
Update the ARMv6 core clang targets to be an arm1176jzf-s. This brings us
in line with gcc in base as this makes llvm generate code for the armv6k
variant of the instruction set.
Simplify the selection of the pvo_head and pvo allocation zone in
moea_enter_locked() and moea64_enter().

Eliminate an unused variable from moea64_enter().
Fix unwind-info errors in our hand-written arm assembler code.

We have functions nested within functions, and places where we start a
function then never end it, we just jump to the middle of something else.
We tried to express this with nested ENTRY()/END() macros (which result
in .fnstart and .fnend directives), but it turns out there's no way to
express that nesting in ARM EHABI unwind info, and newer tools treat
multiple .fnstart directives without an intervening .fnend as an error.

These changes introduce two new macros, EENTRY() and EEND().  EENTRY()
creates a global label you can call/jump to just like ENTRY(), but it
doesn't emit a .fnstart.  EEND() is a no-op that just documents the
conceptual endpoint that matches up with the same-named EENTRY().

This is based on patches submitted by Stepan Dyatkovskiy, but I made some
changes and added the EEND() stuff, so blame any problems on me.

Submitted by:	Stepan Dyatkovskiy <stpworld@narod.ru>
Fix byte ordering in default RSS key.

The rss_key[] array in netinet/in_rss.c has the bytes in incorrect
order. This results in the RSS test vectors in the Microsft RSS spec
and Intel NIC specs giving incorrect results, and making it difficult
to verify correct hash operation when RSS functionality is added to
new NICs.

CR:		https://phabric.freebsd.org/D516
Reviewed by:	adrian
Like with /usr/lib + /usr/lib/compat, add the optional /usr/lib32/compat
to the ldconfig32 default path.  /usr/lib32 is the 32 bit versions of
*current* libraries, while old versions should be able to be in
/usr/lib32/compat, like with /usr/lib/compat.  The separation is meant to
keep the compile time default search paths cleaner.
Fix an bug in as(1) parsing of arm -march=arch+ext options.  Compare the
arch name to just the characters before the '+' in 'arch+ext'.
Teach as(1) to handle the arm .arch_extension pseudo-op, which accepts
the same values as the -march= command line option.  Add support for the
"sec" extension (security extensions).

We've been getting away without support for the sec extension because
it's bogusly enabled even on arches where its presence is optional.  This
support for .arch_extension is being added mainly so that we can use the
right directives in our source code, and that helps folks using external
toolchains (and will help us when we finally update our toolchain).
Tell the assembler we're building for armv7a with security extensions,
so that the 'smc' (secure monitor call) opcode is valid.

Submitted by:	Stepan Dyatkovskiy <stpworld@narod.ru>
Remove the asconf_auth_nochk sysctl. This was off by default and only
existed to be able to test with non-compliant peers a long time ago.
Add 64-bit atomic ops for armv6.  The only safe way to access a 64-bit
value shared across multiple cores is with atomic_load_64() and
atomic_store_64(), because the normal 64-bit load/store instructions
are not atomic on 32-bit arm.  Luckily the ldrexd/strexd instructions
that are atomic are fairly cheap on armv6.  Because it's fairly simple
to do, this implements all the ops for 64-bit, not just load/store.

Reviewed by:	andrew, cognet
Split gethrtime() and gethrtime_waitfree() and make the former use
nanouptime() instead of getnanouptime().  nanouptime(9) provides more
precise result at expense of being slower.

In r269223, gethrtime() is used as creation time of dbuf, which in turn
acts as portion of lookup key to maintain AVL invariant where there can
not be duplicate items.  Before this change, gethrtime() have preferred
better execution time by sacrificing precision, which may lead to panic
on busy systems with:

	panic: avl_find() succeeded inside avl_add()

Reported by:	allanjude, mav
PR:		kern/192284
MFC after:	11 days
X-MFC-with:	r269223
Add 64-bit atomic ops for armv4, only for kernel code, mostly so that we
don't need any #ifdef stuff to use atomic_load/store_64() elsewhere in
the kernel.  For armv4 the atomics are trivial to implement for kernel
code (just disable interrupts), less so for user mode, so this only has
the kernel mode implementations for now.
Use atomic_load/store_64() in the arm implementation of counter(9), and
remove the XXX comments about non-atomic access to the counters.
Don't return ZIO_PIPELINE_CONTINUE from vdev_op_io_start methods

This prevents recursion of vdev_queue_io_done as per r265321 but
using a different method as recommended on the openzfs list.

We now use zio_interrupt(zio) and return ZIO_PIPELINE_STOP instead
of returning ZIO_PIPELINE_CONTINUE from vdev_*_io_start methods.

zio_vdev_io_start now ASSERTS the that vdev_op_io_start returns
ZIO_PIPELINE_STOP to ensure future changes don't reintroduce
ZIO_PIPELINE_CONTINUE returns.

Cleanup flow in vdev_geom_io_start while I'm here.

Also fix some cases not using SET_ERROR(..)

MFC after:	2 weeks
X-MFC-With:	r265321
Add kdump support for shm_open().

MFC after:	1 week
In the shm_open() and shm_unlink() syscalls, export the path to KTR.

MFC after:	1 week
Use the 64-bit atomics now provided by arm machine/atomic.h instead of
(conflicting) local versions.
cxgbe(4): minor optimizations in ingress queue processing.

Reorganize struct sge_iq.  Make the iq entry size a compile time
constant.  While here, eliminate RX_FL_ESIZE and use EQ_ESIZE directly.

MFC after:	2 weeks