MFC r261774 by feld:

	Add caveat to zpool manpage indicating that we do not automatically activate
	hot spares. This should be MFC'd to all STABLE branches.

	Upon the availability of zfsd, the zpool manpage on relevant branches should
	be updated to remove this caveat and document hot spare's reliance on zfsd.

Requested by:	feld
MFC r262125:

In sys/dev/usb/controller/uss820dci.c, similar to r261977, fix a warning
about uss820dci_odevd being unused, by adding it to the part that
handles getting descriptors.

Reported by:	loos
Reviewed by:	hselasky
MFC r262310:

Move the part in bsd.own.mk that sets -Wno-c++11-extensions for clang to
bsd.sys.mk, where it really belongs.  This also causes the flag to get
added when clang is *not* the default system compiler, but is still
used, e.g. by setting WITH_CLANG_IS_CC manually.
MFC r262467: sh: Add -h option to SYNOPSIS

Reviewed by:	jilles
MFC: r261773

In acline_init(), initialize ac_line to SRC_UNKNOWN.  Previously
this could lead to the -n option effectively being ignored (in case
ac_line happened to be 0 aka SRC_AC), or other undefined behaviour.

PR:		169779
Submitted by:	Alex Gonzalez <loox at e-shell.com>
Reviewed by:	jhb
MFC r262277:

malloc_aligned() may not leave enough space for pointer to allocated memory,
saving the pointer will overwrite bytes belongs to another memory block
unexpectly, to fix the problem, use (allocated address + sizeof(void *)) as
initial value, and slip to next aligned address, so maximum extra bytes is
sizeof(void *) + align - 1.

Tested by: Andre Albsmeier < mail at ma17 dot ata dot myota dot orgndre >

MFC r262334:

Increase alignment to size of pointer if the alignment is too small.
Some modules do not align data at least to size of pointer, they uses a
smaller alignment, but our pointer should be aligned to its native
boundary, otherwise on some platforms, hardware alignment checking
will cause bus error.
MFC	r262346:
ext2fs: fully enable ext4 read-only support.

The ext4 developers tend to tag Ext4-specific flags as
"incompatible" even when such features are not relevant for
read-only support.  This is a consequence of the process
though which this filesystem is implemented without design
and the fact that some new features are not extensible to
ext2/3.

Organize the features according to what we support and sort
them so that we can now read-only mount filesystems with
some features that may be found in newly formatted ext4 fs.

Submitted by:	Zheng Liu
MFC r257472

Rate limit (to once per minute) "Listen queue overflow" message in
sonewconn().
MFC: r262296

Match the correct variable to the variable description.

PR:		121173
Submitted by:	Thomas Mueller <tmueller at sysgo.com>
MFC r262142:

   In ue_attach_post_task(), initialize curvnet to vnet0 before calling if_attach().
   Before this patch, curvnet was NULL.
   When the VIMAGE kernel option is enabled, this eliminates
   kernel panics when USB ethernet devices are plugged in.

PR: 183835
Submitted by: Hiroo Oono <hiroo.ono at gmail dot com>
MFC r262465:

Add a flag to run's device list which uses a standard scsi eject.
The flag indicates that the mcu doesn't need to load firmware.

Tested by:	Alex Deiter <alex dot deiter at gmail.com>, myself
Tested on:	ASUS USB-N66
MFC r262471:

In sys/sparc64/sparc64/spitfire.c, prevent signed shift overflow by
casting to the appropriate type.  (Note this fix cannot be done in
sys/sparc64/sparc64/spitfire.c, since that file is also included by
assembly source files.)

Reviewed by:	marius
MFC r262472:

Make sure a for loop in fire_alloc_msix() terminates, by making the loop
counter signed.

Reviewed by:	marius
MFC r261068

Properly sort the arguments to mtx_init(9).

PR:		misc/186020
Submitted by:	alfred
MFC: r262574

Add tws(4) to the hardware notes.