52ebea74 ("writeback: make backing_dev_info host cgroup-specific
bdi_writebacks") made bdi (backing_dev_info) host per-cgroup wb's
(bdi_writeback's).  As the congested state needs to be per-wb and
referenced from blkcg side and multiple wbs, the patch made all
non-root cong's (bdi_writeback_congested's) reference counted and
indexed on bdi.

When a bdi is destroyed, cgwb_bdi_destroy() tries to drain all
non-root cong's; however, this can hang indefinitely because wb's can
also be referenced from blkcg_gq's which are destroyed after bdi
destruction is complete.

To fix the bug, bdi destruction will be updated to not wait for cong's
to drain, which naturally means that cong's may outlive the associated
bdi.  This is fine for non-root cong's but is problematic for the root
cong's which are embedded in their bdi's as they may end up getting
dereferenced after the containing bdi's are freed.

This patch makes root cong's behave the same as non-root cong's.  They
are no longer embedded in their bdi's but allocated separately during
bdi initialization, indexed and reference counted the same way.

* As cong handling is the same for all wb's, wb->congested
  initialization is moved into wb_init().

* When !CONFIG_CGROUP_WRITEBACK, there was no indexing or refcnting.
  bdi->wb_congested is now a pointer pointing to the root cong
  allocated during bdi init and minimal refcnting operations are
  implemented.

* The above makes root wb init paths diverge depending on
  CONFIG_CGROUP_WRITEBACK.  root wb init is moved to cgwb_bdi_init().

This patch in itself shouldn't cause any consequential behavior
differences but prepares for the actual fix.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Jon Christopherson <jon@jons.org>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=100681Tested-by: Jon Christopherson <jon@jons.org>

Added <linux/slab.h> include to backing-dev.h for kfree() definition.
Signed-off-by: Jens Axboe <axboe@fb.com>

Pull devicetree updates from Grant Likely:
 "A whole lot of bug fixes.

  Nothing stands out here except the ability to enable CONFIG_OF on
  every architecture, and an import of a newer version of dtc"

* tag 'devicetree-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/glikely/linux: (22 commits)
  of/irq: Rename "intc_desc" to "of_intc_desc" to fix OF on sh
  of/irq: Fix pSeries boot failure
  Documentation: DT: Fix a typo in the filename "lantiq,<chip>-pinumx.txt"
  of: define of_find_node_by_phandle for !CONFIG_OF
  of/address: use atomic allocation in pci_register_io_range()
  of: Add vendor prefix for Zodiac Inflight Innovations
  dt/fdt: add empty versions of early_init_dt_*_memory_arch
  of: clean-up unnecessary libfdt include paths
  of: make unittest select OF_EARLY_FLATTREE instead of depend on it
  of: make CONFIG_OF user selectable
  MIPS: prepare for user enabling of CONFIG_OF
  of/fdt: fix argument name and add comments of unflatten_dt_node()
  of: return NUMA_NO_NODE from fallback of_node_to_nid()
  tps6507x.txt: Remove executable permission
  of/overlay: Grammar s/an negative/a negative/
  of/fdt: Make fdt blob input parameters of unflatten functions const
  of: add helper function to retrive match data
  of: Grammar s/property exist/property exists/
  of: Move OF flags to be visible even when !CONFIG_OF
  scripts/dtc: Update to upstream version 9d3649bd3be245c9
  ...

Pull watchdog updates from Wim Van Sebroeck:
 "This contains:

   - new driver for ST's LPC Watchdog
   - new driver for Conexant Digicolor CX92755 SoC
   - new driver for DA9062 watchdog
   - Addition of the watchdog registration deferral mechanism
   - several improvements on omap_wdt
   - several improvements and reboot-support for imgpdc_wdt
   - max63xx_wdt improvements
   - imx2_wdt improvements
   - dw_wdt improvements
   - and other small improvements and fixes"

* git://www.linux-watchdog.org/linux-watchdog: (37 commits)
  watchdog: omap_wdt: early_enable module parameter
  watchdog: gpio_wdt: Add option for early registration
  watchdog: watchdog_core: Add watchdog registration deferral mechanism
  watchdog: max63xx: dynamically allocate device
  watchdog: imx2_wdt: Disable previously acquired clock on error path
  watchdog: imx2_wdt: Check for clk_prepare_enable() error
  watchdog: hpwdt: Add support for WDIOC_SETOPTIONS
  watchdog: docs: omap_wdt also understands nowayout
  watchdog: omap_wdt: implement get_timeleft
  watchdog: da9062: DA9062 watchdog driver
  watchdog: imx2_wdt: set watchdog parent device
  watchdog: mena21_wdt: Fix possible NULL pointer dereference
  watchdog: dw_wdt: keepalive the watchdog at write time
  watchdog: dw_wdt: No need for a spinlock
  watchdog: imx2_wdt: also set wdog->timeout to new_timeout
  watchdog: Allow compile test of GPIO consumers if !GPIOLIB
  watchdog: cadence: Add dependency on HAS_IOMEM
  watchdog: max63xx_wdt: Constify platform_device_id
  watchdog: MAX63XX_WATCHDOG does not depend on ARM
  watchdog: imgpdc: Add some documentation about the timeout
  ...

Pull clock framework updates from Michael Turquette:
 "The changes to the common clock framework for 4.2 are dominated by new
  drivers and updates to existing ones, as usual.

  There are some fixes to the framework itself and several cleanups for
  sparse warnings, etc"

* tag 'clk-for-linus-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (135 commits)
  clk: stm32: Add clock driver for STM32F4[23]xxx devices
  dt-bindings: Document the STM32F4 clock bindings
  cpufreq: exynos: remove Exynos4210 specific cpufreq driver support
  ARM: Exynos: switch to using generic cpufreq driver for Exynos4210
  clk: samsung: exynos4: add cpu clock configuration data and instantiate cpu clock
  clk: samsung: add infrastructure to register cpu clocks
  clk: add CLK_RECALC_NEW_RATES clock flag for Exynos cpu clock support
  doc: dt: add documentation for lpc1850-ccu clk driver
  clk: add lpc18xx ccu clk driver
  doc: dt: add documentation for lpc1850-cgu clk driver
  clk: add lpc18xx cgu clk driver
  clk: keystone: add support for post divider register for main pll
  clk: mvebu: flag the crypto clk as CLK_IGNORE_UNUSED
  clk: cygnus: remove Cygnus dummy clock binding
  clk: cygnus: add clock support for Broadcom Cygnus
  clk: Change bcm clocks build dependency
  clk: iproc: add initial common clock support
  clk: iproc: define Broadcom iProc clock binding
  MAINTAINERS: update email for Michael Turquette
  clk: meson: add some error handling in meson_clk_register_cpu()
  ...

Pull LED subsystem updates from Bryan Wu:
 "In this cycle, we finished to merge patches for LED Flash class
  driver.

  Other than that we have some bug fixes and new drivers for LED
  controllers"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds: (33 commits)
  leds:lp55xx: fix firmware loading error
  leds: fix max77693-led build errors
  leds: fix aat1290 build errors
  leds: aat1290: pass flags parameter to devm_gpiod_get
  leds: ktd2692: pass flags parameter to devm_gpiod_get
  drivers/leds: don't use module_init in non-modular leds-cobalt-raq.c
  leds: aat1290: add support for V4L2 Flash sub-device
  DT: aat1290: Document handling external strobe sources
  leds: max77693: add support for V4L2 Flash sub-device
  media: Add registration helpers for V4L2 flash sub-devices
  v4l: async: Add a pointer to of_node to struct v4l2_subdev, match it
  Documentation: leds: Add description of v4l2-flash sub-device
  leds: add BCM6358 LED driver
  leds: add DT binding for BCM6358 LED controller
  leds: fix brightness changing when software blinking is active
  Documentation: leds-lp5523: describe master fader attributes
  leds: lp5523: add master_fader support
  leds: leds-gpio: Allow compile test if !GPIOLIB
  leds: leds-gpio: Add missing #include <linux/of.h>
  gpiolib: Add missing dummies for the unified device properties interface
  ...

Merge tag 'platform-drivers-x86-v4.2-1' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86

Pull x86 platform driver updates from Darren Hart:
 "Fairly routine update for platform-drivers-x86.

  Mostly fixes and cleanups, with a significant refactoring of toshiba*
  drivers.  Includes the addition of the dell-rbtn driver.

  Details:

  asus-wmi:
   - fan control

  dell*:
   - add Dell airplane mode switch driver

  ideapad-laptop:
   - platform rfkill fixes, and regression fix

  pvpanic:
   - handle missing _STA correctly

  toshiba*:
   - rafactor bluetooth support
   - haps documentation
   - driver cleanup

  other:
   - Use acpi_video_unregister_backlight instead of
     acpi_video_unregister in serveral drivers.
   - Orphan msi-wmi.

* tag 'platform-drivers-x86-v4.2-1' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86: (24 commits)
  MAINTAINERS: Orphan x86 driver msi-wmi
  ideapad: fix software rfkill setting
  dell-laptop: Use dell-rbtn instead i8042 filter when possible
  dell-rbtn: Export notifier for other kernel modules
  dell-rbtn: Dell Airplane Mode Switch driver
  samsung-laptop: Use acpi_video_unregister_backlight instead of acpi_video_unregister
  asus-wmi: Use acpi_video_unregister_backlight instead of acpi_video_unregister
  apple_gmux: Use acpi_video_unregister_backlight instead of acpi_video_unregister
  pvpanic: handle missing _STA correctly
  ideapad_laptop: Lenovo G50-30 fix rfkill reports wireless blocked
  asus-wmi: add fan control
  Documentation/ABI: Add file describing the sysfs entries for toshiba_haps
  toshiba_haps: Make use of DEVICE_ATTR_{RW, WO} macros
  toshiba_haps: Replace sscanf with kstrtoint
  toshiba_acpi: Bump driver version to 0.22
  toshiba_acpi: Remove TOS_FAILURE check from some functions
  toshiba_acpi: Comments cleanup
  toshiba_acpi: Rename hci_{read, write}1 functions
  toshiba_acpi: Remove no longer needed hci_{read, write}2 functions
  toshiba_bluetooth: Change BT status message to debug
  ...

Merge third patchbomb from Andrew Morton:

 - the rest of MM

 - scripts/gdb updates

 - ipc/ updates

 - lib/ updates

 - MAINTAINERS updates

 - various other misc things

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (67 commits)
  genalloc: rename of_get_named_gen_pool() to of_gen_pool_get()
  genalloc: rename dev_get_gen_pool() to gen_pool_get()
  x86: opt into HAVE_COPY_THREAD_TLS, for both 32-bit and 64-bit
  MAINTAINERS: add zpool
  MAINTAINERS: BCACHE: Kent Overstreet has changed email address
  MAINTAINERS: move Jens Osterkamp to CREDITS
  MAINTAINERS: remove unused nbd.h pattern
  MAINTAINERS: update brcm gpio filename pattern
  MAINTAINERS: update brcm dts pattern
  MAINTAINERS: update sound soc intel patterns
  MAINTAINERS: remove website for paride
  MAINTAINERS: update Emulex ocrdma email addresses
  bcache: use kvfree() in various places
  libcxgbi: use kvfree() in cxgbi_free_big_mem()
  target: use kvfree() in session alloc and free
  IB/ehca: use kvfree() in ipz_queue_{cd}tor()
  drm/nouveau/gem: use kvfree() in u_free()
  drm: use kvfree() in drm_free_large()
  cxgb4: use kvfree() in t4_free_mem()
  cxgb3: use kvfree() in cxgb_free_mem()
  ...

Pull timer fixes from Thomas Gleixner:
 "This contains:

   - a build regression fix introduced by the timeconst move

   - a hotplug regression fix introduced by the timer wheel diet

   - a cpu hotplug bug fix for the exynos clocksource driver"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  time: Remove development rules from Kbuild/Makefile
  timer: Fix hotplug regression
  clocksource: exynos_mct: Avoid blocking calls in the cpu hotplug notifier

Pull irq fixes from Thomas Gleixner:
 "This contains:

   - a series of fixes for interrupt drivers to prevent a potential race
     when installing a chained interrupt handler

   - a fix for cpumask pointer misuse

   - a fix for using the wrong interrupt number from struct irq_data

   - removal of unused code and outdated comments

   - a few new helper functions which allow us to cleanup the interrupt
     handling code further in 4.3

   I decided against doing the cleanup at the end of this merge window
   and rather do the preparatory steps for 4.3, so we can run the final
   ABI change at the end of the 4.3 merge window with less risk"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (26 commits)
  ARM/LPC32xx: Use irq not hwirq for __irq_set_handler_locked()
  genirq: Implement irq_set_handler_locked()/irq_set_chip_handler_name_locked()
  genirq: Introduce helper irq_desc_get_irq()
  genirq: Remove irq_node()
  genirq: Clean up outdated comments related to include/linux/irqdesc.h
  mn10300: Fix incorrect use of irq_data->affinity
  MIPS/ralink: Fix race in installing chained IRQ handler
  MIPS/pci: Fix race in installing chained IRQ handler
  MIPS/ath25: Fix race in installing chained IRQ handler
  MIPS/ath25: Fix race in installing chained IRQ handler
  m68k/psc: Fix race in installing chained IRQ handler
  avr32/at32ap: Fix race in installing chained IRQ handler
  sh/intc: Fix race in installing chained IRQ handler
  sh/intc: Fix potential race in installing chained IRQ handler
  pinctrl/sun4i: Fix race in installing chained IRQ handler
  pinctrl/samsung: Fix race in installing chained IRQ handler
  pinctrl/samsung: Fix race in installing chained IRQ handler
  pinctrl/exynos: Fix race in installing chained IRQ handler
  pinctrl/st: Fix race in installing chained IRQ handler
  pinctrl/adi2: Fix race in installing chained IRQ handler
  ...

Pull crypto fixes from Herbert Xu:
 "This fixes the aesni setkey error and removes a couple of unnecessary
  NULL checks in the Intel qat driver"

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: aesni - fix failing setkey for rfc4106-gcm-aesni
  crypto: qat - Deletion of unnecessary checks before two function calls

Pull networking fixes from David Miller:

 1) mlx4 driver bug fixes (TX queue wakeups, csum complete indications)
    from Ido Shamay, Eran Ben Elisha, and Or Gerlitz.

 2) Missing unlock in error path of PTP support in renesas driver, from
    Dan Carpenter.

 3) Add Vitesse 8641 phy IDs to vitesse PHY driver, from Shaohui Xie.

 4) Bnx2x driver bug fixes (linearization of encap packets, scratchpad
    parity error notifications, flow-control and speed settings) from
    Yuval Mintz, Manish Chopra, Shahed Shaikh, and Ariel Elior.

 5) ipv6 extension header parsing in the igb chip has a HW errata,
    disable it.  Frm Todd Fujinaka.

 6) Fix PCI link state locking issue in e1000e driver, from Yanir
    Lubetkin.

 7) Cure panics during MTU change in i40e, from Mitch Williams.

 8) Don't leak promisc refs in DSA slave driver, from Gilad Ben-Yossef.

 9) Add missing HAS_DMA dep to VIA Rhine driver, from Geery
    Uytterhoeven.

10) Make sure DMA map/unmap calls are symmetric in bnx2x driver, from
    Michal Schmidt.

11) Workaround for MDIO access problems in bcm7xxx devices, from FLorian
    Fainelli.

12) Fix races in SCTP protocol between OTTB responses and route
    removals, from Alexander Sverdlin.

13) Fix jumbo frame checksum issue with some mvneta devices, from Simon
    Guinot.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (58 commits)
  sock_diag: don't broadcast kernel sockets
  net: mvneta: disable IP checksum with jumbo frames for Armada 370
  ARM: mvebu: update Ethernet compatible string for Armada XP
  net: mvneta: introduce compatible string "marvell, armada-xp-neta"
  api: fix compatibility of linux/in.h with netinet/in.h
  net: icplus: fix typo in constant name
  sis900: Trivial: Fix typos in enums
  stmmac: Trivial: fix typo in constant name
  sctp: Fix race between OOTB responce and route removal
  net-Liquidio: Delete unnecessary checks before the function call "vfree"
  vmxnet3: Bump up driver version number
  amd-xgbe: Add the __GFP_NOWARN flag to Rx buffer allocation
  net: phy: mdio-bcm-unimac: workaround initial read failures for integrated PHYs
  net: bcmgenet: workaround initial read failures for integrated PHYs
  net: phy: bcm7xxx: workaround MDIO management controller initial read
  bnx2x: fix DMA API usage
  net: via: VIA_RHINE and VIA_VELOCITY should depend on HAS_DMA
  net/phy: tune get_phy_c45_ids to support more c45 phy
  bnx2x: fix lockdep splat
  net: fec: don't access RACC register when not available
  ...

Pul IOMMU fixes from Joerg Roedel:
 "Four fixes have queued up to fix regressions introduced after v4.1:

   - Don't fail IOMMU driver initialization when the add_device
     call-back returns -ENODEV, as that just means that the device is
     not translated by the IOMMU.  This is pretty common on ARM.

   - Two fixes for the ARM-SMMU driver for a wrong feature check and to
     remove a redundant NULL check.

   - A fix for the AMD IOMMU driver to fix a boot panic on systems where
     the BIOS requests Unity Mappings in the IVRS table"

* tag 'iommu-fixes-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/amd: Introduce protection_domain_init() function
  iommu/arm-smmu: Delete an unnecessary check before the function call "free_io_pgtable_ops"
  iommu/arm-smmu: Fix broken ATOS check
  iommu: Ignore -ENODEV errors from add_device call-back

Pull sound fixes from Takashi Iwai:
 "Here are a bunch of small fixes, mostly for HD-audio quirks, in
  addition to a few regression fixes and trivial cleanups"

* tag 'sound-fix-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: Fix uninintialized error return
  ALSA: hda: Delete an unnecessary check before the function call "snd_info_free_entry"
  ALSA: hda - Add a fixup for Dell E7450
  ALSA: hda - Fix the dock headphone output on Fujitsu Lifebook E780
  ALSA: hda - Add headset support to Acer Aspire V5
  ALSA: hda - restore the MIC FIXUP for some Dell machines
  ALSA: jack: Fix endless loop at unique index detection
  ALSA: hda - set proper caps for newer AMD hda audio in KB/KV
  ALSA: hda - Disable widget power-save for VIA codecs
  ALSA: hda - Fix Dock Headphone on Thinkpad X250 seen as a Line Out

Avoid the warning:

  WARNING: mm/built-in.o(.text.unlikely+0xc22): Section mismatch in reference from the function .new_kmalloc_cache() to the variable .init.rodata:kmalloc_info
  The function .new_kmalloc_cache() references
  the variable __initconst kmalloc_info.
Signed-off-by: Christoph Lameter <cl@linux.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull power management and ACPI fixes from Rafael Wysocki:
 "These are fixes that didn't make it to the previous PM+ACPI pull
  request or are fixing issues introduced by it.

  Specifics:

   - Fix a recently added memory leak in an error path in the ACPI
     resources management code (Dan Carpenter)

   - Fix a build warning triggered by an ACPI video header function that
     should be static inline (Borislav Petkov)

   - Change names of helper function converting struct fwnode_handle
     pointers to either struct device_node or struct acpi_device
     pointers so they don't conflict with local variable names
     (Alexander Sverdlin)

   - Make the hibernate core re-enable nonboot CPUs on failures to
     disable them as expected (Vitaly Kuznetsov)

   - Increase the default timeout of the device suspend watchdog to
     prevent it from triggering too early on some systems (Takashi Iwai)

   - Prevent the cpuidle powernv driver from registering idle states
     with CPUIDLE_FLAG_TIMER_STOP set if CONFIG_TICK_ONESHOT is unset
     which leads to boot hangs (Preeti U Murthy)"

* tag 'pm+acpi-4.2-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  tick/idle/powerpc: Do not register idle states with CPUIDLE_FLAG_TIMER_STOP set in periodic mode
  PM / sleep: Increase default DPM watchdog timeout to 60
  PM / hibernate: re-enable nonboot cpus on disable_nonboot_cpus() failure
  ACPI / OF: Rename of_node() and acpi_node() to to_of_node() and to_acpi_node()
  ACPI / video: Inline acpi_video_set_dmi_backlight_type
  ACPI / resources: free memory on error in add_region_before()

Pull xen updates from David Vrabel:
 "Xen features and cleanups for 4.2-rc0:

   - add "make xenconfig" to assist in generating configs for Xen guests

   - preparatory cleanups necessary for supporting 64 KiB pages in ARM
     guests

   - automatically use hvc0 as the default console in ARM guests"

* tag 'for-linus-4.2-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  block/xen-blkback: s/nr_pages/nr_segs/
  block/xen-blkfront: Remove invalid comment
  block/xen-blkfront: Remove unused macro MAXIMUM_OUTSTANDING_BLOCK_REQS
  arm/xen: Drop duplicate define mfn_to_virt
  xen/grant-table: Remove unused macro SPP
  xen/xenbus: client: Fix call of virt_to_mfn in xenbus_grant_ring
  xen: Include xen/page.h rather than asm/xen/page.h
  kconfig: add xenconfig defconfig helper
  kconfig: clarify kvmconfig is for kvm
  xen/pcifront: Remove usage of struct timeval
  xen/tmem: use BUILD_BUG_ON() in favor of BUG_ON()
  hvc_xen: avoid uninitialized variable warning
  xenbus: avoid uninitialized variable warning
  xen/arm: allow console=hvc0 to be omitted for guests
  arm,arm64/xen: move Xen initialization earlier
  arm/xen: Correctly check if the event channel interrupt is present

Pull module updates from Rusty Russell:
 "Main excitement here is Peter Zijlstra's lockless rbtree optimization
  to speed module address lookup.  He found some abusers of the module
  lock doing that too.

  A little bit of parameter work here too; including Dan Streetman's
  breaking up the big param mutex so writing a parameter can load
  another module (yeah, really).  Unfortunately that broke the usual
  suspects, !CONFIG_MODULES and !CONFIG_SYSFS, so those fixes were
  appended too"

* tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (26 commits)
  modules: only use mod->param_lock if CONFIG_MODULES
  param: fix module param locks when !CONFIG_SYSFS.
  rcu: merge fix for Convert ACCESS_ONCE() to READ_ONCE() and WRITE_ONCE()
  module: add per-module param_lock
  module: make perm const
  params: suppress unused variable error, warn once just in case code changes.
  modules: clarify CONFIG_MODULE_COMPRESS help, suggest 'N'.
  kernel/module.c: avoid ifdefs for sig_enforce declaration
  kernel/workqueue.c: remove ifdefs over wq_power_efficient
  kernel/params.c: export param_ops_bool_enable_only
  kernel/params.c: generalize bool_enable_only
  kernel/module.c: use generic module param operaters for sig_enforce
  kernel/params: constify struct kernel_param_ops uses
  sysfs: tightened sysfs permission checks
  module: Rework module_addr_{min,max}
  module: Use __module_address() for module_address_lookup()
  module: Make the mod_tree stuff conditional on PERF_EVENTS || TRACING
  module: Optimize __module_address() using a latched RB-tree
  rbtree: Implement generic latch_tree
  seqlock: Introduce raw_read_seqcount_latch()
  ...

Pull ARC architecture updates from Vineet Gupta:

 - support for HS38 cores based on ARCv2 ISA

     ARCv2 is the next generation ISA from Synopsys and basis for the
     HS3{4,6,8} families of processors which retain the traditional ARC mantra of
     low power and configurability and are now more performant and feature rich.

     HS38x is a 10 stage pipeline core which supports MMU (with huge pages) and
     SMP (upto 4 cores) among other features.

     + www.synopsys.com/dw/ipdir.php?ds=arc-hs38-processor
     + http://news.synopsys.com/2014-10-14-New-DesignWare-ARC-HS38-Processor-Doubles-Performance-for-Embedded-Linux-Applications
     + http://www.embedded.com/electronics-news/4435975/Synopsys-ARC-HS38-core-gives-2X-boost-to-Linux-based-apps

 - support for ARC SDP (Software Development platform): Main Board + CPU Cards
    = AXS101: CPU Card with ARC700 in silicon @ 700 MHz
    = AXS103: CPU Card with HS38x in FPGA

 - refactoring of ARCompact port to accomodate new ARCv2 ISA

 - misc updates/cleanups

* tag 'arc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: (72 commits)
  ARC: Fix build failures for ARCompact in linux-next after ARCv2 support
  ARCv2: Allow older gcc to cope with new regime of ARCv2/ARCompact support
  ARCv2: [vdk] dts files and defconfig for HS38 VDK
  ARCv2: [axs103] Support ARC SDP FPGA platform for HS38x cores
  ARC: [axs101] Prepare for AXS103
  ARCv2: [nsim*hs*] Support simulation platforms for HS38x cores
  ARCv2: All bits in place, allow ARCv2 builds
  ARCv2: SLC: Handle explcit flush for DMA ops (w/o IO-coherency)
  ARCv2: STAR 9000837815 workaround hardware exclusive transactions livelock
  ARC: Reduce bitops lines of code using macros
  ARCv2: barriers
  arch: conditionally define smp_{mb,rmb,wmb}
  ARC: add smp barriers around atomics per Documentation/atomic_ops.txt
  ARC: add compiler barrier to LLSC based cmpxchg
  ARCv2: SMP: intc: IDU 2nd level intc for dynamic IRQ distribution
  ARCv2: SMP: clocksource: Enable Global Real Time counter
  ARCv2: SMP: ARConnect debug/robustness
  ARCv2: SMP: Support ARConnect (MCIP) for Inter-Core-Interrupts et al
  ARC: make plat_smp_ops weak to allow over-rides
  ARCv2: clocksource: Introduce 64bit local RTC counter
  ...

Add a early_enable module parameter to the omap_wdt that starts the
watchdog on module insertion. The default value is 0 which does not
start the watchdog - which also does not change the behavior if the
parameter is not given.
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

time.o gets rebuilt unconditionally due to a leftover Makefile rule
which was placed there for development purposes.

Remove it along with the commented out always rule in the toplevel
Kbuild file.

Fixes: 0a227985 'time: Move timeconst.h into include/generated'
Reported-by; Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Nicholas Mc Guire <der.herr@hofr.at>

This function contains the common parts between the
initialization of dma_ops_domains and usual protection
domains. This also fixes a long-standing bug which was
uncovered by recent changes, in which the api_lock was not
initialized for dma_ops_domains.
Reported-by: George Wang <xuw2015@gmail.com>
Tested-by: George Wang <xuw2015@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Pull arch/tile updates from Chris Metcalf:
 "These are a grab bag of changes to improve debugging and respond to a
  variety of issues raised on LKML over the last couple of months"

* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
  tile: avoid a "label not used" warning in do_page_fault()
  tile: vdso: use raw_read_seqcount_begin() in vdso
  tile: force CONFIG_TILEGX if ARCH != tilepro
  tile: improve stack backtrace
  tile: fix "odd fault" warning for stack backtraces
  tile: set up initial stack top to honor STACK_TOP_DELTA
  tile: support delivering NMIs for multicore backtrace
  drivers/tty/hvc/hvc_tile.c: properly return -EAGAIN
  tile: add <asm/word-at-a-time.h> and enable support functions
  tile: use READ_ONCE() in arch_spin_is_locked()
  tile: modify arch_spin_unlock_wait() semantics

Pull more s390 updates from Martin Schwidefsky:
 "There is one larger patch for the AP bus code to make it work with the
  longer reset periods of the latest crypto cards.

  A new default configuration, a naming cleanup for SMP and a few fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/kdump: fix compile for !SMP
  s390/kdump: fix nosmt kernel parameter
  s390: new default configuration
  s390/smp: cleanup core vs. cpu in the SCLP interface
  s390/smp: fix sigp cpu detection loop
  s390/zcrypt: Fixed reset and interrupt handling of AP queues
  s390/kdump: fix REGSET_VX_LOW vector register ELF notes
  s390/bpf: Fix backward jumps

Pull CIFS/SMB3 updates from Steve French:
 "Includes two bug fixes, as well as (minimal) support for the new
  protocol dialect (SMB3.1.1), and support for two ioctls including
  reflink (duplicate extents) file copy and set integrity"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Unset CIFS_MOUNT_POSIX_PATHS flag when following dfs mounts
  Update negotiate protocol for SMB3.11 dialect
  Add ioctl to set integrity
  Add Get/Set Integrity Information structure definitions
  Add reflink copy over SMB3.11 with new FSCTL_DUPLICATE_EXTENTS
  Add SMB3.11 mount option synonym for new dialect
  add struct FILE_STANDARD_INFO
  Make dialect negotiation warning message easier to read
  Add defines and structs for smb3.1 dialect
  Allow parsing vers=3.11 on cifs mount
  client MUST ignore EncryptionKeyLength if CAP_EXTENDED_SECURITY is set

Pul xfs updates from Dave Chinner:
 "There's a couple of small API changes to the core DAX code which
  required small changes to the ext2 and ext4 code bases, but otherwise
  everything is within the XFS codebase.

  This update contains:

   - A new sparse on-disk inode record format to allow small extents to
     be used for inode allocation when free space is fragmented.

   - DAX support.  This includes minor changes to the DAX core code to
     fix problems with lock ordering and bufferhead mapping abuse.

   - transaction commit interface cleanup

   - removal of various unnecessary XFS specific type definitions

   - cleanup and optimisation of freelist preparation before allocation

   - various minor cleanups

   - bug fixes for
	- transaction reservation leaks
	- incorrect inode logging in unwritten extent conversion
	- mmap lock vs freeze ordering
	- remote symlink mishandling
	- attribute fork removal issues"

* tag 'xfs-for-linus-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs: (49 commits)
  xfs: don't truncate attribute extents if no extents exist
  xfs: clean up XFS_MIN_FREELIST macros
  xfs: sanitise error handling in xfs_alloc_fix_freelist
  xfs: factor out free space extent length check
  xfs: xfs_alloc_fix_freelist() can use incore perag structures
  xfs: remove xfs_caddr_t
  xfs: use void pointers in log validation helpers
  xfs: return a void pointer from xfs_buf_offset
  xfs: remove inst_t
  xfs: remove __psint_t and __psunsigned_t
  xfs: fix remote symlinks on V5/CRC filesystems
  xfs: fix xfs_log_done interface
  xfs: saner xfs_trans_commit interface
  xfs: remove the flags argument to xfs_trans_cancel
  xfs: pass a boolean flag to xfs_trans_free_items
  xfs: switch remaining xfs_trans_dup users to xfs_trans_roll
  xfs: check min blks for random debug mode sparse allocations
  xfs: fix sparse inodes 32-bit compile failure
  xfs: add initial DAX support
  xfs: add DAX IO path support
  ...

Pull btrfs updates from Chris Mason:
 "Outside of our usual batch of fixes, this integrates the subvolume
  quota updates that Qu Wenruo from Fujitsu has been working on for a
  few releases now.  He gets an extra gold star for making btrfs smaller
  this time, and fixing a number of quota corners in the process.

  Dave Sterba tested and integrated Anand Jain's sysfs improvements.
  Outside of exporting a symbol (ack'd by Greg) these are all internal
  to btrfs and it's mostly cleanups and fixes.  Anand also attached some
  of our sysfs objects to our internal device management structs instead
  of an object off the super block.  It will make device management
  easier overall and it's a better fit for how the sysfs files are used.
  None of the existing sysfs files are moved around.

  Thanks for all the fixes everyone"

* 'for-linus-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (87 commits)
  btrfs: delayed-ref: double free in btrfs_add_delayed_tree_ref()
  Btrfs: Check if kobject is initialized before put
  lib: export symbol kobject_move()
  Btrfs: sysfs: add support to show replacing target in the sysfs
  Btrfs: free the stale device
  Btrfs: use received_uuid of parent during send
  Btrfs: fix use-after-free in btrfs_replay_log
  btrfs: wait for delayed iputs on no space
  btrfs: qgroup: Make snapshot accounting work with new extent-oriented qgroup.
  btrfs: qgroup: Add the ability to skip given qgroup for old/new_roots.
  btrfs: ulist: Add ulist_del() function.
  btrfs: qgroup: Cleanup the old ref_node-oriented mechanism.
  btrfs: qgroup: Switch self test to extent-oriented qgroup mechanism.
  btrfs: qgroup: Switch to new extent-oriented qgroup mechanism.
  btrfs: qgroup: Switch rescan to new mechanism.
  btrfs: qgroup: Add new qgroup calculation function btrfs_qgroup_account_extents().
  btrfs: backref: Add special time_seq == (u64)-1 case for btrfs_find_all_roots().
  btrfs: qgroup: Add new function to record old_roots.
  btrfs: qgroup: Record possible quota-related extent for qgroup.
  btrfs: qgroup: Add function qgroup_update_counters().
  ...

Pull more block layer patches from Jens Axboe:
 "A few later arrivers that I didn't fold into the first pull request,
  so we had a chance to run some testing.  This contains:

   - NVMe:
        - Set of fixes from Keith
        - 4.4 and earlier gcc build fix from Andrew

   - small set of xen-blk{back,front} fixes from Bob Liu.

   - warnings fix for bogus inline statement in I_BDEV() from Geert.

   - error code fixup for SG_IO ioctl from Paolo Bonzini"

* 'for-linus' of git://git.kernel.dk/linux-block:
  drivers/block/nvme-core.c: fix build with gcc-4.4.4
  bdi: Remove "inline" keyword from exported I_BDEV() implementation
  block: fix bogus EFAULT error from SG_IO ioctl
  NVMe: Fix filesystem deadlock on removal
  NVMe: Failed controller initialization fixes
  NVMe: Unify controller probe and resume
  NVMe: Don't use fake status on cancelled command
  NVMe: Fix device cleanup on initialization failure
  drivers: xen-blkfront: only talk_to_blkback() when in XenbusStateInitialising
  xen/block: add multi-page ring support
  driver: xen-blkfront: move talk_to_blkback to a more suitable place
  drivers: xen-blkback: delay pending_req allocation to connect_ring

To be consistent with other kernel interface namings, rename
of_get_named_gen_pool() to of_gen_pool_get().  In the original function
name "_named" suffix references to a device tree property, which contains
a phandle to a device and the corresponding device driver is assumed to
register a gen_pool object.

Due to a weak relation and to avoid any confusion (e.g.  in future
possible scenario if gen_pool objects are named) the suffix is removed.

[sfr@canb.auug.org.au: crypto/marvell/cesa - fix up for of_get_named_gen_pool() rename]
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Boris BREZILLON <boris.brezillon@free-electrons.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

To be consistent with other genalloc interface namings, rename
dev_get_gen_pool() to gen_pool_get().  The original omitted "dev_" prefix
is removed, since it points to argument type of the function, and so it
does not bring any useful information.

[akpm@linux-foundation.org: update arch/arm/mach-socfpga/pm.c]
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Mark Brown <broonie@kernel.org>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Alan Tull <atull@opensource.altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

For 32-bit userspace on a 64-bit kernel, this requires modifying
stub32_clone to actually swap the appropriate arguments to match
CONFIG_CLONE_BACKWARDS, rather than just leaving the C argument for tls
broken.

Patch co-authored by Josh Triplett and Thiago Macieira.
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thiago Macieira <thiago.macieira@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Add entry for zpool to MAINTAINERS file.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Cc: Seth Jennings <sjennings@variantweb.net>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Kent's email address in MAINTAINERS seems to be invalid.
This was his last sign-off address, so use that if appropriate.

Fix the S: status entry while there.
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Jens' email address bounces, so move his name and entry to CREDITS.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Ishizaki Kou <kou.ishizaki@toshiba.co.jp>
Cc: Jens Osterkamp <jens@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit 13e71d69 ("nbd: Remove kernel internal header") deleted the
file, remove the pattern.
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit 23a71fd6 ("dt-bindings: brcm: rationalize Broadcom
documentation naming") renamed the file, update the pattern.
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit 8c0b9ee8 ("MIPS: Move device-trees into vendor
sub-directories") moved the files, update the pattern.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit 2106241a ("ASoC: Intel: create common folder and move common
files in") moved the files around.  Update the patterns.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Jie Yang <yang.jie@intel.com>
Acked-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The webpage mentioned is not working,
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

@emulex.com addresses respond to use @avagotech.com.
Signed-off-by: Laurent Navet <laurent.navet@gmail.com>
Acked-By: Devesh Sharma <devesh.sharma@avagotech.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Use kvfree() instead of open-coding it.
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Cc: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>