Do not try to enable new features in the %cr4 if running under
hypervisor.  Apparently, hypervisors failed to filter out 'Standard
Extended Features' report from CPUID, but deliver #gp when
corresponding bit in %cr4 is toggled.

This shall be reconsidered later, after hypervisors correct the bug.

Reported and tested by:	joel
Reviewed by:	avg
MFC after:	2 weeks
Fix LOW and FULL speed USB INTERRUPT endpoint support for the
DWC OTG driver. Fix a hang issue when using LOW and FULL speed
BULK traffic. Make sure we don't ask for data in the last
microframe. This allows using devices like USB mice and USB
keyboards connected to the RPI-B.

Suggested by:	gonzo @
Dont compile some files in drm with -finline-limit=1350. GCC 4.2.1 doesnt
need that and clang does not support that. This effectively reverts r126542.
Complete MPSAFE VFS interface and remove MNTK_MPSAFE flag.
Porters should refer to __FreeBSD_version 1000021 for this change as
it may have happened at the same timeframe.
Simplify sending keepalives.
Prepare ipfw_tick() to be used by other consumers.

Reviewed by:	ae(basically)
MFC after:	2 weeks
Reduce LLVM's default stack alignment for i386 from 16 to 4 bytes, as
the FreeBSD ABI requires.  This is essentially a revert of upstream llvm
commit r126226, and it will be reverted by upstream too.

MFC after:	1 week
Undo over-aggressive conversion of spaces to tabs. ie: those within
format strings, "period, space, space" in comment text, etc.
Use %s when calling make_dev with a string pointer.  This makes
clang happy.

MFC after:	2 weeks
Attempt toward a buildable universe by silenting a few warnings for OFED.
Import jemalloc 3.2.0.
MFV r242729 (mm):

Illumos r13840:97fd5cdf328a:

3145 single-copy arc
3212 ztest: race condition between vdev_online() and spa_vdev_remove()

Illumos r13849:3468a95b27cd:

3258 ztest's use of file descriptors is unstable
Allow maxusers to scale on machines with large address space.

Some hooks are added to clamp down maxusers and nmbclusters for
small address space systems.

VM_MAX_AUTOTUNE_MAXUSERS - the max maxusers that will be autotuned based on
physical memory.
VM_MAX_AUTOTUNE_NMBCLUSTERS - max nmbclusters based on physical memory.

These are set to the old values on i386 to preserve the clamping that was
being done to all arches.

Another macro VM_AUTOTUNE_NMBCLUSTERS is provided to allow an override
for the calculation on a MD basis.  Currently no arch defines this.

Reviewed by: peter
MFC after: 2 weeks
Be a bit more paranoid.
Use more portable constructs in order to allow upstream adoption
Add per-file error messages

Reviewed by:	jilles
Approved by:	cperciva
MFC after:	1 week
Correct date and spelling of encounter between Stanley and
Livingstone.

MFC after:	2 weeks
More style(9) tabs vs. spaces:
- tabs after #define
- Not in comments.

MFC after:	2 weeks
Several optimizations to sched_idletd():
 - Do not try to steal load from other CPUs if there was no contest switches
on this CPU (i.e. it was idle all the time and woke up just for bus mastering
or TLB shutdown). If current CPU was idle, then it is quite unlikely that some
other CPU has load to steal.  Under high I/O rate, when TLB shutdowns cause
numerous CPU wakeups, on 24-CPU system load stealing code may consume up to
25% of all CPU time without giving any benefits.
 - Change code that implements spinning for load to restart spin in case of
context switch.  Previous code periodically called cpu_idle() even under
high interrupt/context switch rate.
 - Rise spinning threshold to 10KHz, where it gives at least some effect
that may worth consumed power.

Reviewed by:	jeff@
Fix the build.
Initialize hdrlen to 0 to avoid clang warning in NOINET case.
MFi386: r241785

  boot: use -march=i386 for both i386 and amd64 builds
zfs_ioc_destroy_snaps_nvl: remove disk device entries for zvol snapshots

... before trying to destroy the zvol snapshots themselves.

PR:		kern/173442
Reported by:	Petri Helenius <petri@helenius.fi>,
		mm
Obtained from:	Brian Behlendorf <behlendorf1@llnl.gov>,
		Illumos Bug #3170
Tested by:	Petri Helenius <petri@helenius.fi>
MFC after:	10 days