When the underflow checks were added to workingset_node_shadow_dec(),
they triggered immediately:

  kernel BUG at ./include/linux/swap.h:276!
  invalid opcode: 0000 [#1] SMP
  Modules linked in: isofs usb_storage fuse xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_REJECT nf_reject_ipv6
   soundcore wmi acpi_als pinctrl_sunrisepoint kfifo_buf tpm_tis industrialio acpi_pad pinctrl_intel tpm_tis_core tpm nfsd auth_rpcgss nfs_acl lockd grace sunrpc dm_crypt
  CPU: 0 PID: 20929 Comm: blkid Not tainted 4.8.0-rc8-00087-gbe67d60b #1
  Hardware name: System manufacturer System Product Name/Z170-K, BIOS 1803 05/06/2016
  task: ffff8faa93ecd940 task.stack: ffff8faa7f478000
  RIP: page_cache_tree_insert+0xf1/0x100
  Call Trace:
    __add_to_page_cache_locked+0x12e/0x270
    add_to_page_cache_lru+0x4e/0xe0
    mpage_readpages+0x112/0x1d0
    blkdev_readpages+0x1d/0x20
    __do_page_cache_readahead+0x1ad/0x290
    force_page_cache_readahead+0xaa/0x100
    page_cache_sync_readahead+0x3f/0x50
    generic_file_read_iter+0x5af/0x740
    blkdev_read_iter+0x35/0x40
    __vfs_read+0xe1/0x130
    vfs_read+0x96/0x130
    SyS_read+0x55/0xc0
    entry_SYSCALL_64_fastpath+0x13/0x8f
  Code: 03 00 48 8b 5d d8 65 48 33 1c 25 28 00 00 00 44 89 e8 75 19 48 83 c4 18 5b 41 5c 41 5d 41 5e 5d c3 0f 0b 41 bd ef ff ff ff eb d7 <0f> 0b e8 88 68 ef ff 0f 1f 84 00
  RIP  page_cache_tree_insert+0xf1/0x100

This is a long-standing bug in the way shadow entries are accounted in
the radix tree nodes. The shrinker needs to know when radix tree nodes
contain only shadow entries, no pages, so node->count is split in half
to count shadows in the upper bits and pages in the lower bits.

Unfortunately, the radix tree implementation doesn't know of this and
assumes all entries are in node->count. When there is a shadow entry
directly in root->rnode and the tree is later extended, the radix tree
implementation will copy that entry into the new node and and bump its
node->count, i.e. increases the page count bits. Once the shadow gets
removed and we subtract from the upper counter, node->count underflows
and triggers the warning. Afterwards, without node->count reaching 0
again, the radix tree node is leaked.

Limit shadow entries to when we have actual radix tree nodes and can
count them properly. That means we lose the ability to detect refaults
from files that had only the first page faulted in at eviction time.

Fixes: 449dd698 ("mm: keep page cache radix tree nodes in check")
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reported-and-tested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull security subsystem updates from James Morris:

  SELinux/LSM:
   - overlayfs support, necessary for container filesystems

  LSM:
   - finally remove the kernel_module_from_file hook

  Smack:
   - treat signal delivery as an 'append' operation

  TPM:
   - lots of bugfixes & updates

  Audit:
   - new audit data type: LSM_AUDIT_DATA_FILE

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (47 commits)
  Revert "tpm/tpm_crb: implement tpm crb idle state"
  Revert "tmp/tpm_crb: fix Intel PTT hw bug during idle state"
  Revert "tpm/tpm_crb: open code the crb_init into acpi_add"
  Revert "tmp/tpm_crb: implement runtime pm for tpm_crb"
  lsm,audit,selinux: Introduce a new audit data type LSM_AUDIT_DATA_FILE
  tmp/tpm_crb: implement runtime pm for tpm_crb
  tpm/tpm_crb: open code the crb_init into acpi_add
  tmp/tpm_crb: fix Intel PTT hw bug during idle state
  tpm/tpm_crb: implement tpm crb idle state
  tpm: add check for minimum buffer size in tpm_transmit()
  tpm: constify TPM 1.x header structures
  tpm/tpm_crb: fix the over 80 characters checkpatch warring
  tpm/tpm_crb: drop useless cpu_to_le32 when writing to registers
  tpm/tpm_crb: cache cmd_size register value.
  tmp/tpm_crb: drop include to platform_device
  tpm/tpm_tis: remove unused itpm variable
  tpm_crb: fix incorrect values of cmdReady and goIdle bits
  tpm_crb: refine the naming of constants
  tpm_crb: remove wmb()'s
  tpm_crb: fix crb_req_canceled behavior
  ...

Pull audit updates from Paul Moore:
 "Another relatively small pull request for v4.9 with just two patches.

  The patch from Richard updates the list of features we support and
  report back to userspace; this should have been sent earlier with the
  rest of the v4.8 patches but it got lost in my inbox.

  The second patch fixes a problem reported by our Android friends where
  we weren't very consistent in recording PIDs"

* 'stable-4.9' of git://git.infradead.org/users/pcmoore/audit:
  audit: add exclude filter extension to feature bitmap
  audit: consistently record PIDs with task_tgid_nr()

Pull s390 updates from Martin Schwidefsky:
 "The new features and main improvements in this merge for v4.9

   - Support for the UBSAN sanitizer

   - Set HAVE_EFFICIENT_UNALIGNED_ACCESS, it improves the code in some
     places

   - Improvements for the in-kernel fpu code, in particular the overhead
     for multiple consecutive in kernel fpu users is recuded

   - Add a SIMD implementation for the RAID6 gen and xor operations

   - Add RAID6 recovery based on the XC instruction

   - The PCI DMA flush logic has been improved to increase the speed of
     the map / unmap operations

   - The time synchronization code has seen some updates

  And bug fixes all over the place"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (48 commits)
  s390/con3270: fix insufficient space padding
  s390/con3270: fix use of uninitialised data
  MAINTAINERS: update DASD maintainer
  s390/cio: fix accidental interrupt enabling during resume
  s390/dasd: add missing \n to end of dev_err messages
  s390/config: Enable config options for Docker
  s390/dasd: make query host access interruptible
  s390/dasd: fix panic during offline processing
  s390/dasd: fix hanging offline processing
  s390/pci_dma: improve lazy flush for unmap
  s390/pci_dma: split dma_update_trans
  s390/pci_dma: improve map_sg
  s390/pci_dma: simplify dma address calculation
  s390/pci_dma: remove dma address range check
  iommu/s390: simplify registration of I/O address translation parameters
  s390: migrate exception table users off module.h and onto extable.h
  s390: export header for CLP ioctl
  s390/vmur: fix irq pointer dereference in int handler
  s390/dasd: add missing KOBJ_CHANGE event for unformatted devices
  s390: enable UBSAN
  ...

Pull documentation updates from Jonathan Corbet:
 "This is the documentation update pull for the 4.9 merge window.

  The Sphinx transition is still creating a fair amount of work. Here we
  have a number of fixes and, importantly, a proper PDF output solution,
  thanks to Jani Nikula, Mauro Carvalho Chehab and Markus Heiser.

  I've started a couple of new books: a driver API book (based on the
  old device-drivers.tmpl) and a development tools book. Both are meant
  to show how we can integrate together our existing documentation into
  a more coherent and accessible whole. It involves moving some stuff
  around and formatting changes, but, I think, the results are worth it.
  The good news is that most of our existing Documentation/*.txt files
  are *almost* in RST format already; the amount of messing around
  required is minimal.

  And, of course, there's the usual set of updates, typo fixes, and
  more"

* tag 'docs-4.9' of git://git.lwn.net/linux: (120 commits)
  URL changed for Linux Foundation TAB
  dax : Fix documentation with respect to struct pages
  iio: Documentation: Correct the path used to create triggers.
  docs: Remove space-before-label guidance from CodingStyle
  docs-rst: add inter-document cross references
  Documentation/email-clients.txt: convert it to ReST markup
  Documentation/kernel-docs.txt: reorder based on timestamp
  Documentation/kernel-docs.txt: Add dates for online docs
  Documentation/kernel-docs.txt: get rid of broken docs
  Documentation/kernel-docs.txt: move in-kernel docs
  Documentation/kernel-docs.txt: remove more legacy references
  Documentation/kernel-docs.txt: add two published books
  Documentation/kernel-docs.txt: sort books per publication date
  Documentation/kernel-docs.txt: adjust LDD references
  Documentation/kernel-docs.txt: some improvements on the ReST output
  Documentation/kernel-docs.txt: Consistent indenting: 4 spaces
  Documentation/kernel-docs.txt: Add 4 paper/book references
  Documentation/kernel-docs.txt: Improve layouting of book list
  Documentation/kernel-docs.txt: Remove offline or outdated entries
  docs: Clean up bare :: lines
  ...

Pull jfs updates from David Kleikamp:
 "Minor jfs updates"

* tag 'jfs-4.9' of git://github.com/kleikamp/linux-shaggy:
  jfs: Simplify code
  jfs: jump to error_out when filemap_{fdatawait, write_and_wait} fails

Pull gfs2 updates from Bob Peterson:
 "We've only got six GFS2 patches for this merge window.  In patch
  order:

   - Fabian Frederick submitted a nice cleanup that uses the BIT macro
     rather than bit shifting.

   - Andreas Gruenbacher contributed a patch that fixes a long-standing
     annoyance whereby GFS2 warned about dirty pages.

   - Andreas also fixed a problem with the recent extended attribute
     readahead feature.

   - Chao Yu contributed a patch that checks the return code from
     function register_shrinker and reacts accordingly. Previously, it
     was not checked.

   - Andreas Gruenbacher also fixed a problem whereby incore file
     timestamps were forgotten if the file was invalidated. This merely
     moves the assignment inside the inode glock where it belongs.

   - Andreas also fixed a problem where incore timestamps were not
     initialized"

* tag 'gfs2-4.8.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Initialize atime of I_NEW inodes
  gfs2: Update file times after grabbing glock
  gfs2: fix to detect failure of register_shrinker
  gfs2: Fix extended attribute readahead optimization
  gfs2: Remove dirty buffer warning from gfs2_releasepage
  GFS2: use BIT() macro

Pull file locking updates from Jeff Layton:
 "Only a single patch from Nikolay this cycle, with a small change to
  better handle /proc/locks in a containerized host"

* tag 'locks-v4.9-1' of git://git.samba.org/jlayton/linux:
  locks: Filter /proc/locks output on proc pid ns

Pull hdi1 rdma driver updates from Doug Ledford:
 "This is the first pull request of the 4.9 merge window for the RDMA
  subsystem. It is only the hfi1 driver. It had dependencies on code
  that only landed late in the 4.7-rc cycle (around 4.7-rc7), so putting
  this with my other for-next code would have create an ugly merge of
  lot of 4.7-rc stuff. For that reason, it's being submitted
  individually. It's been through 0day and linux-next"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma: (37 commits)
  IB/rdmavt: Trivial function comment corrected.
  IB/hfi1: Fix trace of atomic ack
  IB/hfi1: Update SMA ingress checks for response packets
  IB/hfi1: Use EPROM platform configuration read
  IB/hfi1: Add ability to read platform config from the EPROM
  IB/hfi1: Restore EPROM read ability
  IB/hfi1: Document new sysfs entries for hfi1 driver
  IB/hfi1: Add new debugfs sdma_cpu_list file
  IB/hfi1: Add irq affinity notification handler
  IB/hfi1: Add a new VL sysfs attribute for sdma engines
  IB/hfi1: Add sysfs interface for affinity setup
  IB/hfi1: Fix resource release in context allocation
  IB/hfi1: Remove unused variable from devdata
  IB/hfi1: Cleanup tasklet refs in comments
  IB/hfi1: Adjust hardware buffering parameter
  IB/hfi1: Act on external device timeout
  IB/hfi1: Fix defered ack race with qp destroy
  IB/hfi1: Combine shift copy and byte copy for SGE reads
  IB/hfi1: Do not read more than a SGE length
  IB/hfi1: Extend i2c timeout
  ...

Pull EDAC updates from Borislav Petkov:
 "A lot of movement in the EDAC tree this time around, coarse summary
  below:

   - Altera Arria10 enablement of NAND, DMA, USB, QSPI and SD-MMC FIFO
     buffers (Thor Thayer)

   - split the memory controller part out of mpc85xx and share it with a
     new Freescale ARM Layerscape driver (York Sun)

   - amd64_edac fixes (Yazen Ghannam)

   - misc cleanups, refactoring and fixes all over the place"

* tag 'edac_for_4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp: (37 commits)
  EDAC, altera: Add IRQ Flags to disable IRQ while handling
  EDAC, altera: Correct EDAC IRQ error message
  EDAC, amd64: Autoload module using x86_cpu_id
  EDAC, sb_edac: Remove NULL pointer check on array pci_tad
  EDAC: Remove NO_IRQ from powerpc-only drivers
  EDAC, fsl_ddr: Fix error return code in fsl_mc_err_probe()
  EDAC, fsl_ddr: Add entry to MAINTAINERS
  EDAC: Move Doug Thompson to CREDITS
  EDAC, I3000: Orphan driver
  EDAC, fsl_ddr: Replace simple_strtoul() with kstrtoul()
  EDAC, layerscape: Add Layerscape EDAC support
  EDAC, fsl_ddr: Fix IRQ dispose warning when module is removed
  EDAC, fsl_ddr: Add support for little endian
  EDAC, fsl_ddr: Add missing DDR DRAM types
  EDAC, fsl_ddr: Rename macros and names
  EDAC, fsl-ddr: Separate FSL DDR driver from MPC85xx
  EDAC, mpc85xx: Replace printk() with pr_* format
  EDAC, mpc85xx: Drop setting/clearing RFXE bit in HID1
  EDAC, altera: Rename MC trigger to common name
  EDAC, altera: Rename device trigger to common name
  ...

Pull spi updates from Mark Brown:
 "The SPI subsystem has also had quite a quiet release, though with a
  fairly large set of per-driver changes and several new drivers. The
  bulk of the changes are:

   - lots and lots of cleanups and improvements for the fsl-espi driver

   - new drivers for Broadcom MSPI/iProc/STB, Cavium ThunderX and
     J-Core"

* tag 'spi-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (80 commits)
  spi: sc18is602: Change gpiod_set_value to gpiod_set_value_cansleep
  spi: pxa2xx: Fix build error because of missing header
  spi: imx: fix error return code in spi_imx_probe()
  spi: pxa2xx: Add support for GPIO descriptor chip selects
  spi: imx: Gracefully handle NULL master->cs_gpios
  spi: iproc-qspi: Add Broadcom iProc SoCs support
  spi: fsl-espi: improve return value handling in fsl_espi_probe
  spi: fsl-espi: simplify of_fsl_espi_probe
  spi: fsl-espi: remove unused variable in fsl_espi_setup
  spi: bcm-qspi: Fix error return code in bcm_qspi_probe()
  spi: bcm-qspi: Fix return value check in bcm_qspi_probe()
  spi: bcm-qspi: fix suspend/resume #ifdef
  spi: bcm-qspi: don't include linux/mtd/cfi.h
  spi: core: Use spi_sync_transfer() in spi_write()/spi_read()
  spi: fsl-espi: improve and extend register bit definitions
  spi: fsl-espi: align register access with other drivers
  spi: fsl-espi: improve and simplify interrupt handler
  spi: fsl-espi: simplify fsl_espi_setup_transfer
  spi: imx: support loopback mode on imx35
  spi: imx: set spi_bus_clk for mx1, mx31 and mx35
  ...

Pull regulator updates from Mark Brown:
 "This is an extremely quiet release for the regulator API, we've got a
  small set of bug fixes and minor feature enhancements for drivers plus
  a couple of more visible changes:

   - add support for ramp times in regulators that don't use selectors.

   - new driver for LTC3676"

* tag 'regulator-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator:
  regulator: dbx500: remove unused functions in dbx500-prcmu.c
  regulator: pv88080: Update regulator for PV88080 BB silicon support
  regulator: core: don't return error with inadequate reason
  regulator: tps65910: Work around silicon erratum SWCZ010
  regulator: core: Add set_voltage_time op
  regulator: core: Don't skip set_voltage_time when ramp delay disabled
  regulator: core: Simplify error flow in _regulator_do_set_voltage()
  regulator: core: Use local ops variable in _regulator_do_set_voltage()
  regulator: hi6421: mark hi6421_regulator_ldo_get_optimum_mode() static
  regulator: Kconfig: Fix typo
  regulator: bindings: Use the correct symbol for second
  regulator: Remove support for optional supplies in the bulk API
  regulator: Add LTC3676 support
  regulator: rk808: Delete owner assignment
  regulator: tps65218: do not disable DCDC3 during poweroff on broken PMICs
  mfd: tps65218: add version check to the PMIC probe

Pull regmap updates from Mark Brown:
 "Another quiet release, a few small extensions to the set of register
  maps we support and an improvement in the debugfs code:

   - allow viewing of cached contents for write only registers via
     debugfs.

   - support a wider range of read/write flag masks in register formats.

   - support more little endian formats"

* tag 'regmap-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: Add missing little endian functions
  regmap: Allow longer flag masks for read and write
  regmap: debugfs: Add support for dumping write only device registers
  regmap: Add a function to check if a regmap register is cached

Pull clk framework updates from Stephen Boyd:
 "The core clk framework changes are small again. They're mostly minor
  fixes that weren't causing enough problems (or any problems when we're
  just clarifying things) to warrant sending outside the merge window.
  The majority of changes are in drivers for various SoCs. Full details
  are in the logs, but here's the summary.

  Core:

   - Better support for DeviceTree overlays with the addition of the
     CLK_OF_DECLARE_DRIVER macro. Now we won't probe a clk driver for a
     device node that matched during of_clk_init(), unless the driver
     uses CLK_OF_DECLARE_DRIVER instead of CLK_OF_DECLARE. This allows
     overlays to work cleanly for drivers that must probe before the
     device model is ready, and also after it's ready when an overlay is
     loaded.

   - Clarification in the code around how clk_hw pointers are returned
     from of clk providers

   - Proper migration of prepare/enable counts to parents when the clk
     tree is constructed

  New Drivers:

   - Socionext's UniPhier SoCs
   - Loongson1C
   - ZTE ZX296718
   - Qualcomm MDM9615
   - Amlogic GXBB AO clocks and resets
   - Broadcom BCM53573 ILP
   - Maxim MAX77620

 Updates:

   - Four Allwinner SoCs are migrated to the new style clk driver (A31,
     A31s, A23 and A33)
   - Exynos 5xxx audio and DRAM clks
   - Loongson1B AC97, DMA and NAND clks
   - Rockchip DDR clks and rk3399 driver tweaks
   - Renesas R-Car M3-W (r8a7796) SoC SDHI interface and Watchdog timer
     clks
   - Renasas R-Car H3 and M3-W CMT clks and RAVB+Thermal clks for M3-W
   - Amlogic GXBB MMC gate clks
   - at91 sama5d4 sckc
   - Removal of STiH415 and STiH416 clk support as the SoC is being
     removed
   - Rework of STiH4xx clk support for new style bindings
   - Continuation of driver migration to clk_hw based registration APIs
   - xgene PMD support
   - bcm2835 critical clk markings
   - ARM versatile ICST"

* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (199 commits)
  CLK: Add Loongson1C clock support
  clk: Loongson1: Make use of GENMASK
  clk: Loongson1: Update clocks of Loongson1B
  clk: Loongson1: Refactor Loongson1 clock
  clk: change the type of clk_hw_onecell_data.num to unsigned int
  clk: zx296718: register driver earlier with core_initcall
  clk: mvebu: dynamically allocate resources in Armada CP110 system controller
  clk: mvebu: fix setting unwanted flags in CP110 gate clock
  clk: nxp: clk-lpc32xx: Unmap region obtained by of_iomap
  clk: mediatek: clk-mt8173: Unmap region obtained by of_iomap
  clk: sunxi-ng: Fix reset offset for the A23 and A33
  clk: at91: sckc: optimize boot time
  clk: at91: Add sama5d4 sckc support
  clk: at91: move slow clock controller clocks to sckc.c
  clk: imx6: initialize GPU clocks
  clk: imx6: fix i.MX6DL clock tree to reflect reality
  clk: imx53: Add clocks configuration
  clk: uniphier: add clock data for UniPhier SoCs
  clk: uniphier: add core support code for UniPhier clock driver
  clk: bcm: Add driver for BCM53573 ILP clock
  ...

Merge tag 'hwmon-for-linus-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon updates from Guenter Roeck:

 - New hwmon registration API, including ports of several drivers to the
   new API

 - New hwmon driver for APM X-Gene SoC

 - Added support for UCD90160, DPS-460, DPS-800, and SGD009 PMBUs chips

 - Various cleanups, minor improvements, and fixes in several drivers

* tag 'hwmon-for-linus-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: (54 commits)
  hwmon: (nct6775) Add support for multiple virtual temperature sources
  hwmon: (adt7470) No need for additional synchronization on kthread_stop()
  hwmon: (lm95241) Update module description to include LM95231
  hwmon: (lm95245) Select REGMAP_I2C
  hwmon: (ibmpowernv) Fix label for cores numbers not threads
  hwmon: (adt7470) Allow faster removal
  hwmon: (adt7470) Add write support to alarm_mask
  hwmon: (xgene) access mailbox as RAM
  hwmon: (lm95245) Use new hwmon registration API
  hwmon: (lm95241) Convert to use new hwmon registration API
  hwmon: (jc42) Convert to use new hwmon registration API
  hwmon: (max31790) Convert to use new hwmon registration API
  hwmon: (nct7904) Convert to use new hwmon registration API
  hwmon: (ltc4245) Convert to use new hwmon registration API
  hwmon: (tmp421) Convert to use new hwmon registration API
  hwmon: (tmp102) Convert to use new hwmon registration API
  hwmon: (lm90) Convert to use new hwmon registration API
  hwmon: (lm75) Convert to use new hwmon registration API
  hwmon: (xgene) Fix crash when alarm occurs before driver probe
  hwmon: (iio_hwmon) defer probe when no channel is found
  ...

Pull LED driver updates from Jacek Anaszewski:
 "Three new LED class drivers and some minor fixes and improvementes to
  the leds-gpio driver, LED Trigger core and documentation"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
  leds: triggers: Check return value of kobject_uevent_env()
  leds: triggers: Return from led_trigger_set() if there is nothing to do
  leds: gpio: fix and simplify error handling in gpio_leds_create
  leds: gpio: switch to managed version of led_classdev_register
  leds: gpio: fix and simplify reading property "label"
  leds: gpio: simplify gpio_leds_create
  leds: gpio: add helper cdev_to_gpio_led_data
  leds: gpio: fix an unhandled error case in create_gpio_led
  leds: gpio: introduce gpio_blink_set_t
  leds: add driver for Mellanox systems LEDs
  Documentation: move oneshot trigger attributes documentation to ABI
  leds: centralize definition of "default-state" property
  leds: add PM8058 LEDs driver
  leds: pm8058: add device tree bindings
  leds: do not overflow sysfs buffer in led_trigger_show
  leds: make triggers explicitly non-modular
  DT: leds: Add bindings for ISSI is31fl319x
  leds: is31fl319x: 1/3/6/9-channel light effect led driver

That just generally kills the machine, and makes debugging only much
harder, since the traces may long be gone.

Debugging by assert() is a disease.  Don't do it.  If you can continue,
you're much better off doing so with a live machine where you have a
much higher chance that the report actually makes it to the system logs,
rather than result in a machine that is just completely dead.

The only valid situation for BUG_ON() is when continuing is not an
option, because there is massive corruption.  But if you are just
verifying that something is true, you warn about your broken assumptions
(preferably just once), and limp on.

Fixes: 22f2ac51 ("mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page()")
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull usb/phy/extcon updates from Greg KH:
 "Here is the big USB, and PHY, and extcon, patchsets for 4.9-rc1.

  Full details are in the shortlog, but generally a lot of new hardware
  support, usb gadget updates, and Wolfram's great cleanup of USB error
  message handling, making the kernel image a tad bit smaller.

  All of this has been in linux-next with no reported issues"

* tag 'usb-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (343 commits)
  Revert "usbtmc: convert to devm_kzalloc"
  USB: serial: cp210x: Add ID for a Juniper console
  usb: Kconfig: using select for USB_COMMON dependency
  bluetooth: bcm203x: don't print error when allocating urb fails
  mmc: host: vub300: don't print error when allocating urb fails
  usb: hub: change CLEAR_FEATURE to SET_FEATURE
  usb: core: Introduce a USB port LED trigger
  USB: bcma: drop Northstar PHY 2.0 initialization code
  usb: core: hcd: add missing header dependencies
  usb: musb: da8xx: fix error handling message in probe
  usb: musb: Fix session based PM for first invalid VBUS
  usb: musb: Fix PM runtime for disconnect after unconfigure
  musb: Export musb_root_disconnect for use in modules
  usb: misc: legousbtower: Fix NULL pointer deference
  cdc-acm: hardening against malicious devices
  Revert "usb: gadget: NCM: Protect dev->port_usb using dev->lock"
  include: extcon: Fix compilation error caused because of incomplete merge
  MAINTAINERS: add tree entry for USB Serial
  phy-twl4030-usb: initialize charging-related stuff via pm_runtime
  phy-twl4030-usb: better handle musb_mailbox() failure
  ...

Pull tty and serial updates from Greg KH:
 "Here is the big tty and serial patch set for 4.9-rc1.

  It also includes some drivers/dma/ changes, as those were needed by
  some serial drivers, and they were all acked by the DMA maintainer.

  Also in here is the long-suffering ACPI SPCR patchset, which was
  passed around from maintainer to maintainer like a hot-potato. Seems I
  was the sucker^Wlucky one. All of those patches have been acked by the
  various subsystem maintainers as well.

  All of this has been in linux-next with no reported issues"

* tag 'tty-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (111 commits)
  Revert "serial: pl011: add console matching function"
  MAINTAINERS: update entry for atmel_serial driver
  serial: pl011: add console matching function
  ARM64: ACPI: enable ACPI_SPCR_TABLE
  ACPI: parse SPCR and enable matching console
  of/serial: move earlycon early_param handling to serial
  Revert "drivers/tty: Explicitly pass current to show_stack"
  tty: amba-pl011: Don't complain on -EPROBE_DEFER when no irq
  nios2: dts: 10m50: Add tx-threshold parameter
  serial: 8250: Set Altera 16550 TX FIFO Threshold
  serial: 8250: of: Load TX FIFO Threshold from DT
  Documentation: dt: serial: Add TX FIFO threshold parameter
  drivers/tty: Explicitly pass current to show_stack
  serial: imx: Fix DCD reading
  serial: stm32: mark symbols static where possible
  serial: xuartps: Add some register initialisation to cdns_early_console_setup()
  serial: xuartps: Removed unwanted checks while reading the error conditions
  serial: xuartps: Rewrite the interrupt handling logic
  serial: stm32: use mapbase instead of membase for DMA
  tty/serial: atmel: fix fractional baud rate computation
  ...

Pull driver core updates from Greg KH:
 "Here are the "big" driver core patches for 4.9-rc1. Also in here are a
  number of debugfs fixes that cropped up due to the changes that
  happened in 4.8 for that filesystem. Overall, nothing major, just a
  few fixes and cleanups.

  All of these have been in linux-next with no reported issues"

* tag 'driver-core-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (23 commits)
  drivers: dma-coherent: Move spinlock in dma_alloc_from_coherent()
  drivers: dma-coherent: Fix DMA coherent size for less than page
  MAINTAINERS: extend firmware_class maintainer list
  debugfs: propagate release() call result
  driver-core: platform: Catch errors from calls to irq_get_irq_data
  sysfs print name of undiscoverable attribute group
  carl9170: fix debugfs crashes
  b43legacy: fix debugfs crash
  b43: fix debugfs crash
  debugfs: introduce a public file_operations accessor
  device core: Remove deprecated create_singlethread_workqueue
  drivers/base dmam_declare_coherent_memory leaks
  platform: don't return 0 from platform_get_irq[_byname]() on error
  cpu: clean up register_cpu func
  dma-mapping: use vma_pages().
  drivers: dma-coherent: use vma_pages().
  attribute_container: Fix typo
  base: soc: make it explicitly non-modular
  drivers: base: dma-mapping: page align the size when unmap_kernel_range
  platform driver: fix use-after-free in platform_device_del()
  ...

Pull char/misc driver updates from Greg KH:
 "Here's the "big" char and misc driver update for 4.9-rc1.

  Lots of little things here, all over the driver tree for subsystems
  that flow through me. Nothing major that I can discern, full details
  are in the shortlog.

  All have been in the linux-next tree with no reported issues"

* tag 'char-misc-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (144 commits)
  drivers/misc/hpilo: Changes to support new security states in iLO5 FW
  at25: fix debug and error messaging
  misc/genwqe: ensure zero initialization
  vme: fake: remove unexpected unlock in fake_master_set()
  vme: fake: mark symbols static where possible
  spmi: pmic-arb: Return an error code if sanity check fails
  Drivers: hv: get rid of id in struct vmbus_channel
  Drivers: hv: make VMBus bus ids persistent
  mcb: Add a dma_device to mcb_device
  mcb: Enable PCI bus mastering by default
  mei: stop the stall timer worker if not needed
  clk: probe common clock drivers earlier
  vme: fake: fix build for 64-bit dma_addr_t
  ttyprintk: Neaten and simplify printing
  mei: me: add kaby point device ids
  coresight: tmc: mark symbols static where possible
  coresight: perf: deal with error condition properly
  Drivers: hv: hv_util: Avoid dynamic allocation in time synch
  fpga manager: Add hardware dependency to Zynq driver
  Drivers: hv: utils: Support TimeSync version 4.0 protocol samples.
  ...

Pull CPU hotplug updates from Thomas Gleixner:
 "Yet another batch of cpu hotplug core updates and conversions:

   - Provide core infrastructure for multi instance drivers so the
     drivers do not have to keep custom lists.

   - Convert custom lists to the new infrastructure. The block-mq custom
     list conversion comes through the block tree and makes the diffstat
     tip over to more lines removed than added.

   - Handle unbalanced hotplug enable/disable calls more gracefully.

   - Remove the obsolete CPU_STARTING/DYING notifier support.

   - Convert another batch of notifier users.

   The relayfs changes which conflicted with the conversion have been
   shipped to me by Andrew.

   The remaining lot is targeted for 4.10 so that we finally can remove
   the rest of the notifiers"

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits)
  cpufreq: Fix up conversion to hotplug state machine
  blk/mq: Reserve hotplug states for block multiqueue
  x86/apic/uv: Convert to hotplug state machine
  s390/mm/pfault: Convert to hotplug state machine
  mips/loongson/smp: Convert to hotplug state machine
  mips/octeon/smp: Convert to hotplug state machine
  fault-injection/cpu: Convert to hotplug state machine
  padata: Convert to hotplug state machine
  cpufreq: Convert to hotplug state machine
  ACPI/processor: Convert to hotplug state machine
  virtio scsi: Convert to hotplug state machine
  oprofile/timer: Convert to hotplug state machine
  block/softirq: Convert to hotplug state machine
  lib/irq_poll: Convert to hotplug state machine
  x86/microcode: Convert to hotplug state machine
  sh/SH-X3 SMP: Convert to hotplug state machine
  ia64/mca: Convert to hotplug state machine
  ARM/OMAP/wakeupgen: Convert to hotplug state machine
  ARM/shmobile: Convert to hotplug state machine
  arm64/FP/SIMD: Convert to hotplug state machine
  ...

Pull irq updates from Thomas Gleixner:
 "The irq departement proudly presents:

   - A rework of the core infrastructure to optimally spread interrupt
     for multiqueue devices. The first version was a bit naive and
     failed to take thread siblings and other details into account.
     Developed in cooperation with Christoph and Keith.

   - Proper delegation of softirqs to ksoftirqd, so if ksoftirqd is
     active then no further softirq processsing on interrupt return
     happens. Otherwise we try to delegate and still run another batch
     of network packets in the irq return path, which then tries to
     delegate to ksoftirqd .....

   - A proper machine parseable sysfs based alternative for
     /proc/interrupts.

   - ACPI support for the GICV3-ITS and ARM interrupt remapping

   - Two new irq chips from the ARM SoC zoo: STM32-EXTI and MVEBU-PIC

   - A new irq chip for the JCore (SuperH)

   - The usual pile of small fixlets in core and irqchip drivers"

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (42 commits)
  softirq: Let ksoftirqd do its job
  genirq: Make function __irq_do_set_handler() static
  ARM/dts: Add EXTI controller node to stm32f429
  ARM/STM32: Select external interrupts controller
  drivers/irqchip: Add STM32 external interrupts support
  Documentation/dt-bindings: Document STM32 EXTI controller bindings
  irqchip/mips-gic: Use for_each_set_bit to iterate over local IRQs
  pci/msi: Retrieve affinity for a vector
  genirq/affinity: Remove old irq spread infrastructure
  genirq/msi: Switch to new irq spreading infrastructure
  genirq/affinity: Provide smarter irq spreading infrastructure
  genirq/msi: Add cpumask allocation to alloc_msi_entry
  genirq: Expose interrupt information through sysfs
  irqchip/gicv3-its: Use MADT ITS subtable to do PCI/MSI domain initialization
  irqchip/gicv3-its: Factor out PCI-MSI part that might be reused for ACPI
  irqchip/gicv3-its: Probe ITS in the ACPI way
  irqchip/gicv3-its: Refactor ITS DT init code to prepare for ACPI
  irqchip/gicv3-its: Cleanup for ITS domain initialization
  PCI/MSI: Setup MSI domain on a per-device basis using IORT ACPI table
  ACPI: Add new IORT functions to support MSI domain handling
  ...

Pull timer updates from Thomas Gleixner:
 "A rather smalish set of updates for timers and timekeeping:

   - Two core fixes to prevent potential undefinded behaviour about
     which gcc is complaining rightfully.

   - A fix to prevent stopping the tick on an (soon) offline CPU so it
     can complete the shutdown procedure.

   - Wait for clocks to stabilize before making decisions, so a not yet
     validated clock is not rejected.

   - The usual pile of fixes to the various clocksource drivers.

   - Core code typo and include fixlets"

* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timekeeping: Include the correct header for errno definitions
  clocksource/drivers/ti-32k: Prevent ftrace recursion
  clocksource/mips-gic-timer: Stop checking cpu_has_counter
  clocksource/mips-gic-timer: Print an error if IRQ setup fails
  tick/nohz: Prevent stopping the tick on an offline CPU
  clocksource/drivers/oxnas: Add OX820 compatible
  clocksource/drivers/timer-atmel-pit: Simplify IRQ handler
  clocksource/drivers/timer-atmel-pit: Remove uselesss WARN_ON_ONCE
  clocksource/drivers/timer-atmel-pit: Drop at91sam926x_pit_common_init
  clocksource/drivers/moxart: Replace panic by pr_err
  clocksource/drivers/moxart: Replace setup_irq by request_irq
  clocksource/drivers/moxart: Add Aspeed support
  clocksource/drivers/moxart: Use struct to hold state
  clocksource/drivers/moxart: Refactor enable/disable
  time: Avoid undefined behaviour in ktime_add_safe()
  time: Avoid undefined behaviour in timespec64_add_safe()
  timekeeping: Prints the amounts of time spent during suspend
  clocksource: Defer override invalidation unless clock is unstable
  hrtimer: Spelling fixes

Pull ARC updates from Vineet Gupta:

 - ARCv2 support for native 64-bit atomics using LLOCK/SCONDD
   instructions

 - Support for upcoming 3.0 release of HS38 cores

 - Dwarf unwindinder improvements:
   - enable unwinding of hand written assembler code using CFI
     pseudo-ops
   - switch to .eh_frame (as opposed to historic .debug_frame)
   - get rid of a bunch of adhoc band-aids in the process

 - Misc fixes:
   - perf supporting generic cache-references and cache-misses (Alexey)
   - default NODE_SHIFT (Noam Camus)
   - usage of KFLAG instruction to set IE (Yuriy)

 - Platforms:
   - Add "model" property across the DT (Alexey)
   - Enable MODULE_* in defconfigs

* tag 'arc-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: [plat*] enables MODULE*
  ARCv2: fix local_save_flags
  ARC: CONFIG_NODES_SHIFT fix default values
  ARCv2: intc: Use kflag if STATUS32.IE must be reset
  ARC: .exit.* sections can be discarded in .eh_frame regime
  ARC: dw2 unwind: enable cfi pseudo ops in string lib
  ARC: dw2 unwind: add infrastructure for adding cfi pseudo ops to asm
  ARC: entry: make ret_from_system_call local label
  ARC: dw2 unwind: don't force dwarf 2
  ARC: dw2 unwind: switch to .eh_frame based unwinding
  ARC: dw2 unwind: factor CIE specifics for .eh_frame/.debug_frame
  ARC: module: support R_ARC_32_PCREL relocation
  arc: perf: Enable generic "cache-references" and "cache-misses" events
  ARC: [plat-eznps] add missing atomic_fetch_xxx operations
  ARCv2: Implement atomic64 based on LLOCKD/SCONDD instructions
  ARCv2: Support dynamic peripheral address space in HS38 rel 3.0 cores
  ARCv2: identify HS38 rel 3.0 cores
  ARCv2: Add support for ZeBu Emulation platform for HS cores
  arc: Add "model" properly in device tree description of all boards

Pull m68k updates from Geert Uytterhoeven:
 - cleanups
 - defconfig updates
 - GPG fingerprint update

* tag 'm68k-for-v4.9-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  m68k: Migrate exception table users off module.h and onto extable.h
  CREDITS: Update fingerprint for Geert Uytterhoeven
  m68k: Use IS_ENABLED() instead of checking for built-in or module
  m68k/defconfig: Update defconfigs for v4.8-rc1

Pull x86 vdso updates from Ingo Molnar:
 "The main changes in this cycle centered around adding support for
  32-bit compatible C/R of the vDSO on 64-bit kernels, by Dmitry
  Safonov"

* 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/vdso: Use CONFIG_X86_X32_ABI to enable vdso prctl
  x86/vdso: Only define map_vdso_randomized() if CONFIG_X86_64
  x86/vdso: Only define prctl_map_vdso() if CONFIG_CHECKPOINT_RESTORE
  x86/signal: Add SA_{X32,IA32}_ABI sa_flags
  x86/ptrace: Down with test_thread_flag(TIF_IA32)
  x86/coredump: Use pr_reg size, rather that TIF_IA32 flag
  x86/arch_prctl/vdso: Add ARCH_MAP_VDSO_*
  x86/vdso: Replace calculate_addr in map_vdso() with addr
  x86/vdso: Unmap vdso blob on vvar mapping failure

Pull x86 timer updates from Ingo Molnar:
 "This tree includes a HPET overhead micro-optimization plus new TSC
  frequencies for newer Intel CPUs"

* 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/tsc: Add additional Intel CPU models to the crystal quirk list
  x86/tsc: Use cpu id defines instead of hex constants
  x86/hpet: Reduce HPET counter read contention

Pull x86 platform changes from Ingo Molnar:
 "The main changes in this cycle were:

   - SGI UV updates (Andrew Banman)

   - Intel MID updates (Andy Shevchenko)

   - Initial Mellanox systems platform (Vadim Pasternak)"

* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/platform/mellanox: Fix return value check in mlxplat_init()
  x86/platform/mellanox: Introduce support for Mellanox systems platform
  x86/platform/uv/BAU: Add UV4-specific functions
  x86/platform/uv/BAU: Fix payload queue setup on UV4 hardware
  x86/platform/uv/BAU: Disable software timeout on UV4 hardware
  x86/platform/uv/BAU: Populate ->uvhub_version with UV4 version information
  x86/platform/uv/BAU: Use generic function pointers
  x86/platform/uv/BAU: Add generic function pointers
  x86/platform/uv/BAU: Convert uv_physnodeaddr() use to uv_gpa_to_offset()
  x86/platform/uv/BAU: Clean up pq_init()
  x86/platform/uv/BAU: Clean up and update printks
  x86/platform/uv/BAU: Clean up vertical alignment
  x86/platform/intel-mid: Keep SRAM powered on at boot
  x86/platform/intel-mid: Add Intel Penwell to ID table
  x86/cpu: Rename Merrifield2 to Moorefield
  x86/platform/intel-mid: Implement power off sequence
  x86/platform/intel-mid: Enable SD card detection on Merrifield
  x86/platform/intel-mid: Enable WiFi on Intel Edison
  x86/platform/intel-mid: Run PWRMU command immediately

Pull x86 cleanups from Ingo Molnar:
 "Header file and a wrapper functions cleanup"

* 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86: Migrate exception table users off module.h and onto extable.h
  x86: Clean up various simple wrapper functions

Pull x86 boot updates from Ingo Molnar:
 "The changes in this cycle were:

   - Save e820 table RAM footprint on larger kernel configurations.
     (Denys Vlasenko)

   - pmem related fixes (Dan Williams)

   - theoretical e820 boundary condition fix (Wei Yang)"

* 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/boot: Fix kdump, cleanup aborted E820_PRAM max_pfn manipulation
  x86/e820: Use much less memory for e820/e820_saved, save up to 120k
  x86/e820: Prepare e280 code for switch to dynamic storage
  x86/e820: Mark some static functions __init
  x86/e820: Fix very large 'size' handling boundary condition

Pull low-level x86 updates from Ingo Molnar:
 "In this cycle this topic tree has become one of those 'super topics'
  that accumulated a lot of changes:

   - Add CONFIG_VMAP_STACK=y support to the core kernel and enable it on
     x86 - preceded by an array of changes. v4.8 saw preparatory changes
     in this area already - this is the rest of the work. Includes the
     thread stack caching performance optimization. (Andy Lutomirski)

   - switch_to() cleanups and all around enhancements. (Brian Gerst)

   - A large number of dumpstack infrastructure enhancements and an
     unwinder abstraction. The secret long term plan is safe(r) live
     patching plus maybe another attempt at debuginfo based unwinding -
     but all these current bits are standalone enhancements in a frame
     pointer based debug environment as well. (Josh Poimboeuf)

   - More __ro_after_init and const annotations. (Kees Cook)

   - Enable KASLR for the vmemmap memory region. (Thomas Garnier)"

[ The virtually mapped stack changes are pretty fundamental, and not
  x86-specific per se, even if they are only used on x86 right now. ]

* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (70 commits)
  x86/asm: Get rid of __read_cr4_safe()
  thread_info: Use unsigned long for flags
  x86/alternatives: Add stack frame dependency to alternative_call_2()
  x86/dumpstack: Fix show_stack() task pointer regression
  x86/dumpstack: Remove dump_trace() and related callbacks
  x86/dumpstack: Convert show_trace_log_lvl() to use the new unwinder
  oprofile/x86: Convert x86_backtrace() to use the new unwinder
  x86/stacktrace: Convert save_stack_trace_*() to use the new unwinder
  perf/x86: Convert perf_callchain_kernel() to use the new unwinder
  x86/unwind: Add new unwind interface and implementations
  x86/dumpstack: Remove NULL task pointer convention
  fork: Optimize task creation by caching two thread stacks per CPU if CONFIG_VMAP_STACK=y
  sched/core: Free the stack early if CONFIG_THREAD_INFO_IN_TASK
  lib/syscall: Pin the task stack in collect_syscall()
  x86/process: Pin the target stack in get_wchan()
  x86/dumpstack: Pin the target stack when dumping it
  kthread: Pin the stack via try_get_task_stack()/put_task_stack() in to_live_kthread() function
  sched/core: Add try_get_task_stack() and put_task_stack()
  x86/entry/64: Fix a minor comment rebase error
  iommu/amd: Don't put completion-wait semaphore on stack
  ...

Pull x86 apic updates from Ingo Molnar:
 "The main changes are:

   - Persistent CPU/node numbering across CPU hotplug/unplug events.
     This is a pretty involved series of changes that first fetches all
     the information during bootup and then uses it for the various
     hotplug/unplug methods. (Gu Zheng, Dou Liyang)

   - IO-APIC hot-add/remove fixes and enhancements. (Rui Wang)

   - ... various fixes, cleanups and enhancements"

* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (22 commits)
  x86/apic: Fix silent & fatal merge conflict in __generic_processor_info()
  acpi: Fix broken error check in map_processor()
  acpi: Validate processor id when mapping the processor
  acpi: Provide mechanism to validate processors in the ACPI tables
  x86/acpi: Set persistent cpuid <-> nodeid mapping when booting
  x86/acpi: Enable MADT APIs to return disabled apicids
  x86/acpi: Introduce persistent storage for cpuid <-> apicid mapping
  x86/acpi: Enable acpi to register all possible cpus at boot time
  x86/numa: Online memory-less nodes at boot time
  x86/apic: Get rid of apic_version[] array
  x86/apic: Order irq_enter/exit() calls correctly vs. ack_APIC_irq()
  x86/ioapic: Ignore root bridges without a companion ACPI device
  x86/apic: Update comment about disabling processor focus
  x86/smpboot: Check APIC ID before setting up default routing
  x86/ioapic: Fix IOAPIC failing to request resource
  x86/ioapic: Fix lost IOAPIC resource after hot-removal and hotadd
  x86/ioapic: Fix setup_res() failing to get resource
  x86/ioapic: Support hot-removal of IOAPICs present during boot
  x86/ioapic: Change prototype of acpi_ioapic_add()
  x86/apic, ACPI: Fix incorrect assignment when handling apic/x2apic entries
  ...

Pull scheduler changes from Ingo Molnar:
 "The main changes are:

   - irqtime accounting cleanups and enhancements. (Frederic Weisbecker)

   - schedstat debugging enhancements, make it more broadly runtime
     available. (Josh Poimboeuf)

   - More work on asymmetric topology/capacity scheduling. (Morten
     Rasmussen)

   - sched/wait fixes and cleanups. (Oleg Nesterov)

   - PELT (per entity load tracking) improvements. (Peter Zijlstra)

   - Rewrite and enhance select_idle_siblings(). (Peter Zijlstra)

   - sched/numa enhancements/fixes (Rik van Riel)

   - sched/cputime scalability improvements (Stanislaw Gruszka)

   - Load calculation arithmetics fixes. (Dietmar Eggemann)

   - sched/deadline enhancements (Tommaso Cucinotta)

   - Fix utilization accounting when switching to the SCHED_NORMAL
     policy. (Vincent Guittot)

   - ... plus misc cleanups and enhancements"

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits)
  sched/irqtime: Consolidate irqtime flushing code
  sched/irqtime: Consolidate accounting synchronization with u64_stats API
  u64_stats: Introduce IRQs disabled helpers
  sched/irqtime: Remove needless IRQs disablement on kcpustat update
  sched/irqtime: No need for preempt-safe accessors
  sched/fair: Fix min_vruntime tracking
  sched/debug: Add SCHED_WARN_ON()
  sched/core: Fix set_user_nice()
  sched/fair: Introduce set_curr_task() helper
  sched/core, ia64: Rename set_curr_task()
  sched/core: Fix incorrect utilization accounting when switching to fair class
  sched/core: Optimize SCHED_SMT
  sched/core: Rewrite and improve select_idle_siblings()
  sched/core: Replace sd_busy/nr_busy_cpus with sched_domain_shared
  sched/core: Introduce 'struct sched_domain_shared'
  sched/core: Restructure destroy_sched_domain()
  sched/core: Remove unused @cpu argument from destroy_sched_domain*()
  sched/wait: Introduce init_wait_entry()
  sched/wait: Avoid abort_exclusive_wait() in __wait_on_bit_lock()
  sched/wait: Avoid abort_exclusive_wait() in ___wait_event()
  ...

Pull RAS updates from Ingo Molnar:
 "The main changes were:

   - Lots of enhancements for AMD SMCA (Scalable MCA
     features/extensions) systems: extract, decode and print more
     hardware error information and add matching support on the
     injection/testing side as well. (Yazn Ghannam)

   - Various MCE handling improvements on modern Intel Xeons. (Tony
     Luck)

   - Plus misc fixes and enhancements"

* 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (21 commits)
  x86/RAS/mce_amd_inj: Remove debugfs dir recursively on exit
  x86/RAS/mce_amd_inj: Fix signed wrap around when decrementing index 'i'
  x86/RAS/mce_amd_inj: Fix some W= warnings
  x86/MCE/AMD, EDAC: Handle reserved bank 4 on Fam17h properly
  x86/mce/AMD: Extract the error address on SMCA systems
  x86/mce, EDAC/mce_amd: Print MCA_SYND and MCA_IPID during MCE on SMCA systems
  x86/mce/AMD: Save MCA_IPID in MCE struct on SMCA systems
  x86/mce/AMD: Ensure the deferred error interrupt is of type APIC on SMCA systems
  x86/mce/AMD: Update sysfs bank names for SMCA systems
  x86/mce/AMD, EDAC/mce_amd: Define and use tables for known SMCA IP types
  EDAC/mce_amd: Use SMCA prefix for error descriptions arrays
  EDAC/mce_amd: Add missing SMCA error descriptions
  x86/mce/AMD: Read MSRs on the CPU allocating the threshold blocks
  x86/RAS: Add syndrome support to mce_amd_inj
  EDAC/mce_amd: Print syndrome register value on SMCA systems
  x86/mce: Add support for new MCA_SYND register
  x86/mce/AMD: Use msr_ops.misc() in allocate_threshold_blocks()
  x86/mce: Drop X86_FEATURE_MCE_RECOVERY and the related model string test
  x86/mce: Improve memcpy_mcsafe()
  x86/mce: Add PCI quirks to identify Xeons with machine check recovery
  ...

Pull perf updates from Ingo Molnar:
 "The main kernel side changes were:

   - uprobes enhancements (Masami Hiramatsu)

   - Uncore group events enhancements (David Carrillo-Cisneros)

   - x86 Intel: Add support for Skylake server uncore PMUs (Kan Liang)

   - x86 Intel: LBR cleanups and enhancements, for better branch
     annotation tracking (Peter Zijlstra)

   - x86 Intel: Add support for PTWRITE and power event tracing
     (Alexander Shishkin)

   - ... various fixes, cleanups and smaller enhancements.

  Lots of tooling changes - a couple of highlights:

   - Support event group view with hierarchy mode in 'perf top' and
     'perf report' (Namhyung Kim)

     e.g.:

     $ perf record -e '{cycles,instructions}' make
     $ perf report --hierarchy --stdio
     ...
     #   Overhead  Command / Shared Object / Symbol
     # ......................  ..................................
     ...
     25.74%  27.18%sh
     19.96%  24.14%libc-2.24.so
      9.55%  14.64%[.] __strcmp_sse2
      1.54%   0.00%[.] __tfind
      1.07%   1.13%[.] _int_malloc
      0.95%   0.00%[.] __strchr_sse2
      0.89%   1.39%[.] __tsearch
      0.76%   0.00%[.] strlen

   - Add branch stack / basic block info to 'perf annotate --stdio',
     where for each branch, we add an asm comment after the instruction
     with information on how often it was taken and predicted. See
     example with color output at:

       http://vger.kernel.org/~acme/perf/annotate_basic_blocks.png

     (Peter Zijlstra)

   - Add support for using symbols in address filters with Intel PT and
     ARM CoreSight (hardware assisted tracing facilities) (Adrian
     Hunter, Mathieu Poirier)

   - Add support for interacting with Coresight PMU ETMs/PTMs, that are
     IP blocks to perform hardware assisted tracing on a ARM CPU core
     (Mathieu Poirier)

   - Support generating cross arch probes, i.e. if you specify a vmlinux
     file for different arch than the one in the host machine,

        $ perf probe --definition function_name args

     will generate the probe definition string needed to append to the
     target machine /sys/kernel/debug/tracing/kprobes_events file, using
     scripting (Masami Hiramatsu).

   - Allow configuring the default 'perf report -s' sort order in
     ~/.perfconfig, for instance, "sym,dso" may be more fitting for
     kernel developers. (Arnaldo Carvalho de Melo)

   - ... plus lots of other changes, refactorings, features and fixes"

* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (149 commits)
  perf tests: Add dwarf unwind test for powerpc
  perf probe: Match linkage name with mangled name
  perf probe: Fix to cut off incompatible chars from group name
  perf probe: Skip if the function address is 0
  perf probe: Ignore the error of finding inline instance
  perf intel-pt: Fix decoding when there are address filters
  perf intel-pt: Enable decoder to handle TIP.PGD with missing IP
  perf intel-pt: Read address filter from AUXTRACE_INFO event
  perf intel-pt: Record address filter in AUXTRACE_INFO event
  perf intel-pt: Add a helper function for processing AUXTRACE_INFO
  perf intel-pt: Fix missing error codes processing auxtrace_info
  perf intel-pt: Add support for recording the max non-turbo ratio
  perf intel-pt: Fix snapshot overlap detection decoder errors
  perf probe: Increase debug level of SDT debug messages
  perf record: Add support for using symbols in address filters
  perf symbols: Add dso__last_symbol()
  perf record: Fix error paths
  perf record: Rename label 'out_symbol_exit'
  perf script: Fix vanished idle symbols
  perf evsel: Add support for address filters
  ...

Pull locking updates from Ingo Molnar:
 "The main changes in this cycle were:

   - rwsem micro-optimizations (Davidlohr Bueso)

   - Improve the implementation and optimize the performance of
     percpu-rwsems. (Peter Zijlstra.)

   - Convert all lglock users to better facilities such as percpu-rwsems
     or percpu-spinlocks and remove lglocks. (Peter Zijlstra)

   - Remove the ticket (spin)lock implementation. (Peter Zijlstra)

   - Korean translation of memory-barriers.txt and related fixes to the
     English document. (SeongJae Park)

   - misc fixes and cleanups"

* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
  x86/cmpxchg, locking/atomics: Remove superfluous definitions
  x86, locking/spinlocks: Remove ticket (spin)lock implementation
  locking/lglock: Remove lglock implementation
  stop_machine: Remove stop_cpus_lock and lg_double_lock/unlock()
  fs/locks: Use percpu_down_read_preempt_disable()
  locking/percpu-rwsem: Add down_read_preempt_disable()
  fs/locks: Replace lg_local with a per-cpu spinlock
  fs/locks: Replace lg_global with a percpu-rwsem
  locking/percpu-rwsem: Add DEFINE_STATIC_PERCPU_RWSEMand percpu_rwsem_assert_held()
  locking/pv-qspinlock: Use cmpxchg_release() in __pv_queued_spin_unlock()
  locking/rwsem, x86: Drop a bogus cc clobber
  futex: Add some more function commentry
  locking/hung_task: Show all locks
  locking/rwsem: Scan the wait_list for readers only once
  locking/rwsem: Remove a few useless comments
  locking/rwsem: Return void in __rwsem_mark_wake()
  locking, rcu, cgroup: Avoid synchronize_sched() in __cgroup_procs_write()
  locking/Documentation: Add Korean translation
  locking/Documentation: Fix a typo of example result
  locking/Documentation: Fix wrong section reference
  ...

Pull EFI updates from Ingo Molnar:
 "Main changes in this cycle were:

   - Refactor the EFI memory map code into architecture neutral files
     and allow drivers to permanently reserve EFI boot services regions
     on x86, as well as ARM/arm64. (Matt Fleming)

   - Add ARM support for the EFI ESRT driver. (Ard Biesheuvel)

   - Make the EFI runtime services and efivar API interruptible by
     swapping spinlocks for semaphores. (Sylvain Chouleur)

   - Provide the EFI identity mapping for kexec which allows kexec to
     work on SGI/UV platforms with requiring the "noefi" kernel command
     line parameter. (Alex Thorlton)

   - Add debugfs node to dump EFI page tables on arm64. (Ard Biesheuvel)

   - Merge the EFI test driver being carried out of tree until now in
     the FWTS project. (Ivan Hu)

   - Expand the list of flags for classifying EFI regions as "RAM" on
     arm64 so we align with the UEFI spec. (Ard Biesheuvel)

   - Optimise out the EFI mixed mode if it's unsupported (CONFIG_X86_32)
     or disabled (CONFIG_EFI_MIXED=n) and switch the early EFI boot
     services function table for direct calls, alleviating us from
     having to maintain the custom function table. (Lukas Wunner)

   - Miscellaneous cleanups and fixes"

* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (30 commits)
  x86/efi: Round EFI memmap reservations to EFI_PAGE_SIZE
  x86/efi: Allow invocation of arbitrary boot services
  x86/efi: Optimize away setup_gop32/64 if unused
  x86/efi: Use kmalloc_array() in efi_call_phys_prolog()
  efi/arm64: Treat regions with WT/WC set but WB cleared as memory
  efi: Add efi_test driver for exporting UEFI runtime service interfaces
  x86/efi: Defer efi_esrt_init until after memblock_x86_fill
  efi/arm64: Add debugfs node to dump UEFI runtime page tables
  x86/efi: Remove unused find_bits() function
  fs/efivarfs: Fix double kfree() in error path
  x86/efi: Map in physical addresses in efi_map_region_fixed
  lib/ucs2_string: Speed up ucs2_utf8size()
  firmware-gsmi: Delete an unnecessary check before the function call "dma_pool_destroy"
  x86/efi: Initialize status to ensure garbage is not returned on small size
  efi: Replace runtime services spinlock with semaphore
  efi: Don't use spinlocks for efi vars
  efi: Use a file local lock for efivars
  efi/arm*: esrt: Add missing call to efi_esrt_init()
  efi/esrt: Use memremap not ioremap to access ESRT table in memory
  x86/efi-bgrt: Use efi_mem_reserve() to avoid copying image data
  ...

Pull core SMP updates from Ingo Molnar:
 "Two main change is generic vCPU pinning and physical CPU SMP-call
  support, for Xen to be able to perform certain calls on specific
  physical CPUs - by Juergen Gross"

* 'core-smp-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  smp: Allocate smp_call_on_cpu() workqueue on stack too
  hwmon: Use smp_call_on_cpu() for dell-smm i8k
  dcdbas: Make use of smp_call_on_cpu()
  xen: Add xen_pin_vcpu() to support calling functions on a dedicated pCPU
  smp: Add function to execute a function synchronously on a CPU
  virt, sched: Add generic vCPU pinning support
  xen: Sync xen header