linux: exclude ZONE_DEVICE from GFP_ZONE_TABLE

[Tim Gardner]

mm: exclude ZONE_DEVICE from GFP_ZONE_TABLE

    ZONE_DEVICE (merged in 4.3) and ZONE_CMA (proposed) are examples of new
    mm zones that are bumping up against the current maximum limit of 4
    zones, i.e. 2 bits in page->flags for the GFP_ZONE_TABLE.

    The GFP_ZONE_TABLE poses an interesting constraint since
    include/linux/gfp.h gets included by the 32-bit portion of a 64-bit
    build. We need to be careful to only build the table for zones that
    have a corresponding gfp_t flag. GFP_ZONES_SHIFT is introduced for this
    purpose. This patch does not attempt to solve the problem of adding a
    new zone that also has a corresponding GFP_ flag.

    Vlastimil points out that ZONE_DEVICE, by depending on x86_64 and
    SPARSEMEM_VMEMMAP implies that SECTIONS_WIDTH is zero. In other words
    even though ZONE_DEVICE does not fit in GFP_ZONE_TABLE it is free to
    consume another bit in page->flags (expand ZONES_WIDTH) with room to
    spare.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.4.0-17.33

---------------
linux (4.4.0-17.33) xenial; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1563441

  * ISST-LTE: pVM:high cpus number need a high crashkernel value in kdump
    (LP: #1560552)
    - SAUCE: (noup) ppc64 boot: Wait for boot cpu to show up if nr_cpus limit is
      about to hit.

  * Predictable naming mechanism is leading to issues in DLPAR operations of
    NICs (LP: #1560514)
    - SAUCE: (noup) powerpc/pci: Assign fixed PHB number based on device-tree
      properties

  * ThunderX: support alternative phy implementations (LP: #1562968)
    - net: thunderx: Cleanup PHY probing code.
    - [Config] CONFIG_MDIO_CAVIUM=m
    - phy: mdio-octeon: Refactor into two files/modules
    - [Config] CONFIG_MDIO_THUNDER=m
    - phy: mdio-thunder: Add driver for Cavium Thunder SoC MDIO buses.
    - phy: mdio-cavium: Add missing MODULE_* annotations.
    - net: cavium: For Kconfig THUNDER_NIC_BGX, select MDIO_THUNDER.
    - phy: mdio-thunder: Fix some Kconfig typos
    - [d-i] Add phy drivers for Cavium ThunderX to nic-modules udeb

  * linux: exclude ZONE_DEVICE from GFP_ZONE_TABLE (LP: #1563293)
    - Revert "mm: CONFIG_NR_ZONES_EXTENDED"
    - mm: exclude ZONE_DEVICE from GFP_ZONE_TABLE

  * lots of printk to serial console can hang system for long time
    (LP: #1534216)
    - printk: set may_schedule for some of console_trylock() callers

  * [i915_bpo] Update i915 backport driver (LP: #1560395)
    - SAUCE: i915_bpo: Update to drm-intel-next-fixes-2016-03-16
    - PM / runtime: Add new helper for conditional usage count incrementation
    - drm/core: Add drm_for_each_encoder_mask, v2.
    - drm/atomic-helper: Implement subsystem-level suspend/resume

  * [Hyper-V] VM Sockets (LP: #1541585)
    - Drivers: hv: vmbus: Cleanup vmbus_set_event()
    - Drivers: hv: vmbus: Add vendor and device atttributes
    - Drivers: hv: vmbus: avoid infinite loop in init_vp_index()
    - Drivers: hv: vmbus: avoid scheduling in interrupt context in vmbus_initiate_unload()
    - Drivers: hv: vmbus: don't manipulate with clocksources on crash
    - Drivers: hv: vmbus: add a helper function to set a channel's pending send size
    - Drivers: hv: vmbus: define the new offer type for Hyper-V socket (hvsock)
    - Drivers: hv: vmbus: vmbus_sendpacket_ctl: hvsock: avoid unnecessary signaling
    - Drivers: hv: vmbus: define a new VMBus message type for hvsock
    - Drivers: hv: vmbus: add a hvsock flag in struct hv_driver
    - Drivers: hv: vmbus: add a per-channel rescind callback
    - Drivers: hv: vmbus: add an API vmbus_hvsock_device_unregister()
    - Drivers: hv: vmbus: Eliminate the spin lock on the read path
    - Drivers: hv: vmbus: Give control over how the ring access is serialized
    - drivers/hv: Move VMBus hypercall codes into Hyper-V UAPI header
    - Drivers: hv: vmbus: don't loose HVMSG_TIMER_EXPIRED messages
    - Drivers: hv: vmbus: avoid wait_for_completion() on crash
    - Drivers: hv: vmbus: remove code duplication in message handling
    - Drivers: hv: vmbus: avoid unneeded compiler optimizations in vmbus_wait_for_unload()
    - Drivers: hv: util: Pass the chann...