MFC r267821:

Strict value checking will cause problem.
Bay trail DN2820FYKH is supported on Linux but does not work on FreeBSD.
This behaviour is bug-compatible with Linux-3.13.5.

References:
http://d.hatena.ne.jp/syuu1228/20140326
http://lxr.linux.no/linux+v3.13.5/arch/x86/kernel/acpi/boot.c#L1094

Submitted by: syuu
PR: 187966
Approved by: re (gjb)

Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFC 261517,261520:
Convert the license on files where I am the sole copyright holder to
2 clause BSD licenses.

MFC 246805:
Make VM_NDOMAIN a kernel option so that it can be enabled from a kernel
config file.

MFC r227293 (by ed):
Mark MALLOC_DEFINEs static that have no corresponding MALLOC_DECLAREs.

This means that their use is restricted to a single C file.

MFC 233305,233623:
- Mark the 'lapics' and 'ioapics' arrays here static since they are
private to this file. The 'lapics' array was actually shadowing a
completely different 'lapics' array that is private to local_apic.c.
- Allocate the ioapics[] array dynamically since it is only needed for the
duration of madt_setup_io(). This avoids having the array take up
permanent space in the BSS.

MFC 229427:
Fix a few bugs in the SRAT parsing code:
- Actually increment ndomain when building our list of known domains
so that we can properly renumber them to be 0-based and dense.
- If the number of domains exceeds the configured maximum (VM_NDOMAIN),
bail out of processing the SRAT and disable NUMA rather than hitting an
obscure panic later.
- Don't bother parsing the SRAT at all if VM_NDOMAIN is set to 1 to
disable NUMA (the default).

MFC 226039:
Ignore SRAT memory entries if the memory range does not overlap with an
existing phys_avail[] entry. If a hw.physmem setting causes a memory
domain to not be present in phys_avail[], the SRAT table will now be
ignored rather than triggering a panic when a CPU in the missing domain
tries to allocate a page.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fix a deficiency in the selinfo interface:
If a selinfo object is recorded (via selrecord()) and then it is
quickly destroyed, with the waiters missing the opportunity to awake,
at the next iteration they will find the selinfo object destroyed,
causing a PF#.

That happens because the selinfo interface has no way to drain the
waiters before to destroy the registered selinfo object. Also this
race is quite rare to get in practice, because it would require a
selrecord(), a poll request by another thread and a quick destruction
of the selrecord()'ed selinfo object.

Fix this by adding the seldrain() routine which should be called
before to destroy the selinfo objects (in order to avoid such case),
and fix the present cases where it might have already been called.
Sometimes, the context is safe enough to prevent this type of race,
like it happens in device drivers which installs selinfo objects on
poll callbacks. There, the destruction of the selinfo object happens
at driver detach time, when all the filedescriptors should be already
closed, thus there cannot be a race.
For this case, mfi(4) device driver can be set as an example, as it
implements a full correct logic for preventing this from happening.

Sponsored by: Sandvine Incorporated
Reported by: rstone
Tested by: pluknet
Reviewed by: jhb, kib
Approved by: re (bz)
MFC after: 3 weeks

Remove unneeded includes of <sys/linker_set.h>. Other headers that use
it internally contain nested includes.

Reviewed by: bde

Make APM emulation look more closer to its origin. Use device_get_softc(9)
instead of hardcoding acpi(4) unit number as we have device_t for it.

Refactor acpi_machdep.c for amd64 and i386, move APM emulation into a new
file acpi_apm.c, and place it on sys/x86/acpica.

Now OsdEnvironment.c is identical on amd64 and i386. Move it to a new home.

Move the MADT parser for amd64 and i386 to sys/x86/acpica now that it is
identical on both platforms.

When performing a sanity check on the SRAT table to ensure that each
memory domain has an assigned CPU, ignore disabled CPUs. Previously
disabled CPUs were counted as being in domain 0.

Reported by: mdf

Add a parser for the ACPI SRAT table for amd64 and i386. It sets
PCPU(domain) for each CPU and populates a mem_affinity array suitable
for the NUMA support in the physical memory allocator.

Reviewed by: alc