Patch series "mm/memory_hotplug: Factor out memory block devicehandling", v3.

We only want memory block devices for memory to be onlined/offlined
(add/remove from the buddy).  This is required so user space can
online/offline memory and kdump gets notified about newly onlined
memory.

Let's factor out creation/removal of memory block devices.  This helps
to further cleanup arch_add_memory/arch_remove_memory() and to make
implementation of new features easier - especially sub-section memory
hot add from Dan.

Anshuman Khandual is currently working on arch_remove_memory().  I added
a temporary solution via "arm64/mm: Add temporary arch_remove_memory()
implementation", that is sufficient as a firsts tep in the context of
this series.  (we don't cleanup page tables in case anything goes wrong
already)

Did a quick sanity test with DIMM plug/unplug, making sure all devices
and sysfs links properly get added/removed.  Compile tested on s390x and
x86-64.

This patch (of 11):

By converting start and size to page granularity, we actually ignore
unaligned parts within a page instead of properly bailing out with an
error.

Link: http://lkml.kernel.org/r/20190527111152.16324-2-david@redhat.comSigned-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Arun KS <arunks@codeaurora.org>
Cc: Mathieu Malaterre <malat@debian.org>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Andrew Banman <andrew.banman@hpe.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Baoquan He <bhe@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chintan Pandya <cpandya@codeaurora.org>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Jun Yao <yaojun8558363@gmail.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: "mike.travis@hpe.com" <mike.travis@hpe.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull sound fixes from Takashi Iwai:
 "A collection of small fixes.

   - The optimization of PM resume with HD-audio HDMI codecs, which
     eventually work around weird issues

   - A correction of Intel Icelake HDMI audio code

   - Quirks for Dell machines with Realtek HD-audio codecs

   - The fix for too long sequencer write stall that was spotted by
     syzkaller

   - A few trivial cleanups reported by coccinelle"

* tag 'sound-fix-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda - Don't resume forcibly i915 HDMI/DP codec
  ALSA: hda/hdmi - Fix i915 reverse port/pin mapping
  ALSA: hda/hdmi - Remove duplicated define
  ALSA: seq: Break too long mutex context in the write loop
  ALSA: hda/realtek: apply ALC891 headset fixup to one Dell machine
  ALSA: rme9652: Unneeded variable: "result".
  ALSA: emu10k1: Remove unneeded variable "change"
  ALSA: au88x0: Remove unneeded variable: "changed"
  ALSA: hda/realtek - Fixed Headphone Mic can't record on Dell platform
  ALSA: ps3: Remove Unneeded variable: "ret"
  ALSA: lx6464es: Remove unneeded variable err

Pull more power management updates from Rafael Wysocki:
 "These modify the Intel RAPL driver to allow it to use an MMIO
  interface to the hardware, make the int340X thermal driver provide
  such an interface for it, add Intel Ice Lake CPU IDs to the RAPL
  driver (these changes depend on the previously merged x86 arch
  changes), update cpufreq to use the PM QoS framework for managing the
  min and max frequency limits, and add update the imx-cpufreq-dt
  cpufreq driver to support i.MX8MN.

  Specifics:

   - Add MMIO interface support to the Intel RAPL power capping driver
     and update the int340X thermal driver to provide a RAPL MMIO
     interface (Zhang Rui, Stephen Rothwell).

   - Add Intel Ice Lake CPU IDs to the RAPL driver (Zhang Rui, Rajneesh
     Bhardwaj).

   - Make cpufreq use the PM QoS framework (instead of notifiers) for
     managing the min and max frequency constraints (Viresh Kumar).

   - Add i.MX8MN support to the imx-cpufreq-dt cpufreq driver (Anson
     Huang)"

* tag 'pm-5.3-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (27 commits)
  cpufreq: Make cpufreq_generic_init() return void
  intel_rapl: need linux/cpuhotplug.h for enum cpuhp_state
  powercap/rapl: Add Ice Lake NNPI support to RAPL driver
  powercap/intel_rapl: add support for ICX-D
  powercap/intel_rapl: add support for ICX
  powercap/intel_rapl: add support for IceLake desktop
  intel_rapl: Fix module autoloading issue
  int340X/processor_thermal_device: add support for MMIO RAPL
  intel_rapl: support two power limits for every RAPL domain
  intel_rapl: support 64 bit register
  intel_rapl: abstract RAPL common code
  intel_rapl: cleanup hardcoded MSR access
  intel_rapl: cleanup some functions
  intel_rapl: abstract register access operations
  intel_rapl: abstract register address
  intel_rapl: introduce struct rapl_if_private
  intel_rapl: introduce intel_rapl.h
  intel_rapl: remove hardcoded register index
  intel_rapl: use reg instead of msr
  cpufreq: imx-cpufreq-dt: Add i.MX8MN support
  ...

Pull more ACPI updates from Rafael Wysocki:
 "These get rid of two clang warnings, add a new quirk mechanism to the
  ACPI backlight driver (and apply it to one machine) and update the
  table load object initialization in ACPICA (this is a replacement for
  a previously reverted ACPICA commit).

  Specifics:

   - Make ACPI table loading work more consistently regardless of the
     exact mechanism used for loading a table (Erik Schmauss).

   - Get rid of two clang warnings (Arnd Bergmann).

   - Add new quirk mechanism to the ACPI backlight driver and use it to
     add a quirk for PB Easynote MZ35 (Hans de Goede)"

* tag 'acpi-5.3-rc1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: video: Add new hw_changes_brightness quirk, set it on PB Easynote MZ35
  ACPI: fix false-positive -Wuninitialized warning
  ACPI: blacklist: fix clang warning for unused DMI table
  ACPICA: Update table load object initialization

Merge floppy ioctl verification fixes from Denis Efremov.

This also marks the floppy driver as orphaned - it turns out that Jiri
no longer has working hardware.

Actual working physical floppy hardware is getting hard to find, and
while Willy was able to test this, I think the driver can be considered
pretty much dead from an actual hardware standpoint.  The hardware that
is still sold seems to be mainly USB-based, which doesn't use this
legacy driver at all.

The old floppy disk controller is still emulated in various VM
environments, so the driver isn't going away, but let's see if anybody
is interested to step up to maintain it.

The lack of hardware also likely means that the ioctl range verification
fixes are probably mostly relevant to anybody using floppies in a
virtual environment.  Which is probably also going away in favor of USB
storage emulation, but who knows.

Will Decon reviewed the patches but I'm not rebasing them just for that,
so I'll add a
Reviewed-by: Will Deacon <will@kernel.org>

here instead.

* floppy:
  MAINTAINERS: mark floppy.c orphaned
  floppy: fix out-of-bounds read in copy_buffer
  floppy: fix invalid pointer dereference in drive_name
  floppy: fix out-of-bounds read in next_valid_format
  floppy: fix div-by-zero in setup_format_params

I volunteered myself to maintain it quite some time ago back when I
fixed the concurrency issues which exhibited itself only with
VM-emulated devices, and at the same time I still had the physical 3.5"
reader to test all the changes.

The reader doesn't work any more though, so I guess it's time to step
down from this super-prestigious role :p and mark floppy.c as Orphaned.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* acpi-misc:
  ACPI: fix false-positive -Wuninitialized warning
  ACPI: blacklist: fix clang warning for unused DMI table

* acpi-video:
  ACPI: video: Add new hw_changes_brightness quirk, set it on PB Easynote MZ35

* pm-cpufreq:
  cpufreq: Make cpufreq_generic_init() return void
  cpufreq: imx-cpufreq-dt: Add i.MX8MN support
  cpufreq: Add QoS requests for userspace constraints
  cpufreq: intel_pstate: Reuse refresh_frequency_limits()
  cpufreq: Register notifiers with the PM QoS framework
  PM / QoS: Add support for MIN/MAX frequency constraints
  PM / QOS: Pass request type to dev_pm_qos_read_value()
  PM / QOS: Rename __dev_pm_qos_read_value() and dev_pm_qos_raw_read_value()
  PM / QOS: Pass request type to dev_pm_qos_{add|remove}_notifier()

This fixes a global out-of-bounds read access in the copy_buffer
function of the floppy driver.

The FDDEFPRM ioctl allows one to set the geometry of a disk.  The sect
and head fields (unsigned int) of the floppy_drive structure are used to
compute the max_sector (int) in the make_raw_rw_request function.  It is
possible to overflow the max_sector.  Next, max_sector is passed to the
copy_buffer function and used in one of the memcpy calls.

An unprivileged user could trigger the bug if the device is accessible,
but requires a floppy disk to be inserted.

The patch adds the check for the .sect * .head multiplication for not
overflowing in the set_geometry function.

The bug was found by syzkaller.
Signed-off-by: Denis Efremov <efremov@ispras.ru>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This fixes the invalid pointer dereference in the drive_name function of
the floppy driver.

The native_format field of the struct floppy_drive_params is used as
floppy_type array index in the drive_name function.  Thus, the field
should be checked the same way as the autodetect field.

To trigger the bug, one could use a value out of range and set the drive
parameters with the FDSETDRVPRM ioctl.  Next, FDGETDRVTYP ioctl should
be used to call the drive_name.  A floppy disk is not required to be
inserted.

CAP_SYS_ADMIN is required to call FDSETDRVPRM.

The patch adds the check for a value of the native_format field to be in
the '0 <= x < ARRAY_SIZE(floppy_type)' range of the floppy_type array
indices.

The bug was found by syzkaller.
Signed-off-by: Denis Efremov <efremov@ispras.ru>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This fixes a global out-of-bounds read access in the next_valid_format
function of the floppy driver.

The values from autodetect field of the struct floppy_drive_params are
used as indices for the floppy_type array in the next_valid_format
function 'floppy_type[DP->autodetect[probed_format]].sect'.

To trigger the bug, one could use a value out of range and set the drive
parameters with the FDSETDRVPRM ioctl.  A floppy disk is not required to
be inserted.

CAP_SYS_ADMIN is required to call FDSETDRVPRM.

The patch adds the check for values of the autodetect field to be in the
'0 <= x < ARRAY_SIZE(floppy_type)' range of the floppy_type array indices.

The bug was found by syzkaller.
Signed-off-by: Denis Efremov <efremov@ispras.ru>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This fixes a divide by zero error in the setup_format_params function of
the floppy driver.

Two consecutive ioctls can trigger the bug: The first one should set the
drive geometry with such .sect and .rate values for the F_SECT_PER_TRACK
to become zero.  Next, the floppy format operation should be called.

A floppy disk is not required to be inserted.  An unprivileged user
could trigger the bug if the device is accessible.

The patch checks F_SECT_PER_TRACK for a non-zero value in the
set_geometry function.  The proper check should involve a reasonable
upper limit for the .sect and .rate fields, but it could change the
UAPI.

The patch also checks F_SECT_PER_TRACK in the setup_format_params, and
cancels the formatting operation in case of zero.

The bug was found by syzkaller.
Signed-off-by: Denis Efremov <efremov@ispras.ru>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull another x86 platform driver update from Andy Shevchenko:
 "Provide better naming for ABI, i.e. tell that we have fan boost mode.

  It won't break any ABI, but has to be done now to avoid confusion in
  the future"

* tag 'platform-drivers-x86-v5.3-2' of git://git.infradead.org/linux-platform-drivers-x86:
  platform/x86: asus: Rename "fan mode" to "fan boost mode"

Pull thermal management updates from Zhang Rui:

 - Convert thermal documents to ReST (Mauro Carvalho Chehab)

 - Fix a cyclic depedency in between thermal core and governors (Daniel
   Lezcano)

 - Fix processor_thermal_device driver to re-evaluate power limits after
   resume (Srinivas Pandruvada, Zhang Rui)

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux:
  drivers: thermal: processor_thermal_device: Fix build warning
  docs: thermal: convert to ReST
  thermal/drivers/core: Use governor table to initialize
  thermal/drivers/core: Add init section table for self-encapsulation
  drivers: thermal: processor_thermal: Read PPCC on resume

Pull GPIO fixes from Linus Walleij:

 - Revert a SPIO GPIO fix that didn't fix anything but instead created
   new problems.

 - Remove the EM GPIO irqdomain in a safe manner.

 - Fix a memory leak in the gpio quirks.

 - Make the DaVinci error path silent on probe deferral.

* tag 'gpio-v5.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  Revert "gpio/spi: Fix spi-gpio regression on active high CS"
  gpio: em: remove the gpiochip before removing the irq domain
  gpiolib: of: fix a memory leak in of_gpio_flags_quirks()
  gpio: davinci: silence error prints in case of EPROBE_DEFER

Pull hwspinlock updates from Bjorn Andersson:
 "This contains support for hardware spinlock TI K3 AM65x and J721E
  family of SoCs, support for using hwspinlocks from atomic context and
  better error reporting when dealing with hardware disabled in
  DeviceTree"

* tag 'hwlock-v5.3' of git://github.com/andersson/remoteproc:
  hwspinlock: add the 'in_atomic' API
  hwspinlock: document the hwspinlock 'raw' API
  hwspinlock: stm32: implement the relax() ops
  hwspinlock: ignore disabled device
  hwspinlock/omap: Add a trace during probe
  hwspinlock/omap: Add support for TI K3 SoCs
  dt-bindings: hwlock: Update OMAP binding for TI K3 SoCs

Pull remoteproc updates from Bjorn Andersson:
 "This adds support for the STM32 remoteproc, additional i.MX platforms
  with Cortex M4 remoteprocs and Qualcomm's QCS404 Compute DSP.

  Also initial support for vendor specific resource table entries and
  support for unprocessed Qualcomm firmware files"

* tag 'rproc-v5.3' of git://github.com/andersson/remoteproc:
  remoteproc: stm32: fix building without ARM SMCC
  remoteproc: qcom: q6v5-mss: Fix build error without QCOM_MDT_LOADER
  remoteproc: copy parent dma_pfn_offset for vdev
  remoteproc: qcom: q6v5-mss: Support loading non-split images
  soc: qcom: mdt_loader: Support loading non-split images
  remoteproc: stm32: add an ST stm32_rproc driver
  dt-bindings: remoteproc: add bindings for stm32 remote processor driver
  dt-bindings: stm32: add bindings for ML-AHB interconnect
  remoteproc: Use struct_size() helper
  remoteproc: add vendor resources handling
  remoteproc: imx: Fix typo in "failed"
  remoteproc: imx: Broaden the Kconfig selection logic
  remoteproc,rpmsg: add missing MAINTAINERS file entries
  remoteproc: qcom: qdsp6-adsp: Add support for QCS404 CDSP
  dt-bindings: remoteproc: Rename and amend Hexagon v56 binding

Pull rpmsg updates from Bjorn Andersson:
 "This contains a DT binding update and a change to make the remote
  function of rpmsg_devices optional"

* tag 'rpmsg-v5.3' of git://github.com/andersson/remoteproc:
  rpmsg: core: Make remove handler for rpmsg driver optional.
  dt-bindings: soc: qcom: Add remote-pid binding for GLINK SMEM

Pull virtio, vhost updates from Michael Tsirkin:
 "Fixes, features, performance:

   - new iommu device

   - vhost guest memory access using vmap (just meta-data for now)

   - minor fixes"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio-mmio: add error check for platform_get_irq
  scsi: virtio_scsi: Use struct_size() helper
  iommu/virtio: Add event queue
  iommu/virtio: Add probe request
  iommu: Add virtio-iommu driver
  PCI: OF: Initialize dev->fwnode appropriately
  of: Allow the iommu-map property to omit untranslated devices
  dt-bindings: virtio: Add virtio-pci-iommu node
  dt-bindings: virtio-mmio: Add IOMMU description
  vhost: fix clang build warning
  vhost: access vq metadata through kernel virtual address
  vhost: factor out setting vring addr and num
  vhost: introduce helpers to get the size of metadata area
  vhost: rename vq_iotlb_prefetch() to vq_meta_prefetch()
  vhost: fine grain userspace memory accessors
  vhost: generalize adding used elem

Pull VFIO updates from Alex Williamson:

 - Static symbol cleanup in mdev samples (Kefeng Wang)

 - Use vma help in nvlink code (Peng Hao)

 - Remove unused code in mbochs sample (YueHaibing)

 - Send uevents around mdev registration (Alex Williamson)

* tag 'vfio-v5.3-rc1' of git://github.com/awilliam/linux-vfio:
  mdev: Send uevents around parent device registration
  sample/mdev/mbochs: remove set but not used variable 'mdev_state'
  vfio: vfio_pci_nvlink2: use a vma helper function
  vfio-mdev/samples: make some symbols static

Pull clk updates from Stephen Boyd:
 "This round of clk driver and framework updates is heavy on the driver
  update side. The two main highlights in the core framework are the
  addition of an bulk clk_get API that handles optional clks and an
  extra debugfs file that tells the developer about the current parent
  of a clk.

  The driver updates are dominated by i.MX in the diffstat, but that is
  mostly because that SoC has started converting to the clk_hw style of
  clk registration. The next big update is in the Amlogic meson clk
  driver that gained some support for audio, cpu, and temperature clks
  while fixing some PLL issues. Finally, the biggest thing that stands
  out is the conversion of a large part of the Allwinner sunxi-ng driver
  to the new clk parent scheme that uses less strings and more pointer
  comparisons to match clk parents and children up.

  In general, it looks like we have a lot of little fixes and tweaks
  here and there to clk data along with the normal addition of a handful
  of new drivers and a couple new core framework features.

  Core:
   - Add a 'clk_parent' file in clk debugfs
   - Add a clk_bulk_get_optional() API (with devm too)

  New Drivers:
   - Support gated clk controller on MIPS based BCM63XX SoCs
   - Support SiLabs Si5341 and Si5340 chips
   - Support for CPU clks on Raspberry Pi devices
   - Audsys clock driver for MediaTek MT8516 SoCs

  Updates:
   - Convert a large portion of the Allwinner sunxi-ng driver to new clk parent scheme
   - Small frequency support for SiLabs Si544 chips
   - Slow clk support for AT91 SAM9X60 SoCs
   - Remove dead code in various clk drivers (-Wunused)
   - Support for Marvell 98DX1135 SoCs
   - Get duty cycle of generic pwm clks
   - Improvement in mmc phase calculation and cleanup of some rate defintions
   - Switch i.MX6 and i.MX7 clock drivers to clk_hw based APIs
   - Add GPIO, SNVS and GIC clocks for i.MX8 drivers
   - Mark imx6sx/ul/ull/sll MMDC_P1_IPG and imx8mm DRAM_APB as critical clock
   - Correct imx7ulp nic1_bus_clk and imx8mm audio_pll2_clk clock setting
   - Add clks for new Exynos5422 Dynamic Memory Controller driver
   - Clock definition for Exynos4412 Mali
   - Add CMM (Color Management Module) clocks on Renesas R-Car H3, M3-N, E3, and D3
   - Add TPU (Timer Pulse Unit / PWM) clocks on Renesas RZ/G2M
   - Support for 32 bit clock IDs in TI's sci-clks for J721e SoCs
   - TI clock probing done from DT by default instead of firmware
   - Fix Amlogic Meson mpll fractional part and spread sprectrum issues
   - Add Amlogic meson8 audio clocks
   - Add Amlogic g12a temperature sensors clocks
   - Add Amlogic g12a and g12b cpu clocks
   - Add TPU (Timer Pulse Unit / PWM) clocks on Renesas R-Car H3, M3-W, and M3-N
   - Add CMM (Color Management Module) clocks on Renesas R-Car M3-W
   - Add Clock Domain support on Renesas RZ/N1"

* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (190 commits)
  clk: consoldiate the __clk_get_hw() declarations
  clk: sprd: Add check for return value of sprd_clk_regmap_init()
  clk: lochnagar: Update DT binding doc to include the primary SPDIF MCLK
  clk: Add Si5341/Si5340 driver
  dt-bindings: clock: Add silabs,si5341
  clk: clk-si544: Implement small frequency change support
  clk: add BCM63XX gated clock controller driver
  devicetree: document the BCM63XX gated clock bindings
  clk: at91: sckc: use dedicated functions to unregister clock
  clk: at91: sckc: improve error path for sama5d4 sck registration
  clk: at91: sckc: remove unnecessary line
  clk: at91: sckc: improve error path for sam9x5 sck register
  clk: at91: sckc: add support to free slow clock osclillator
  clk: at91: sckc: add support to free slow rc oscillator
  clk: at91: sckc: add support to free slow oscillator
  clk: rockchip: export HDMIPHY clock on rk3228
  clk: rockchip: add watchdog pclk on rk3328
  clk: rockchip: add clock id for hdmi_phy special clock on rk3228
  clk: rockchip: add clock id for watchdog pclk on rk3328
  clk: at91: sckc: add support for SAM9X60
  ...

Pull RTC updates from Alexandre Belloni:
 "A quiet cycle this time.

   - ds1307: properly handle oscillator failure flags

   - imx-sc: alarm support

   - pcf2123: alarm support, correct offset handling

   - sun6i: add R40 support

   - simplify getting the adapter of an i2c client"

* tag 'rtc-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (37 commits)
  rtc: wm831x: Add IRQF_ONESHOT flag
  rtc: stm32: remove one condition check in stm32_rtc_set_alarm()
  rtc: pcf2123: Fix build error
  rtc: interface: Change type of 'count' from int to u64
  rtc: pcf8563: Clear event flags and disable interrupts before requesting irq
  rtc: pcf8563: Fix interrupt trigger method
  rtc: pcf2123: fix negative offset rounding
  rtc: pcf2123: add alarm support
  rtc: pcf2123: use %ptR
  rtc: pcf2123: port to regmap
  rtc: pcf2123: remove sysfs register view
  rtc: rx8025: simplify getting the adapter of a client
  rtc: rx8010: simplify getting the adapter of a client
  rtc: rv8803: simplify getting the adapter of a client
  rtc: m41t80: simplify getting the adapter of a client
  rtc: fm3130: simplify getting the adapter of a client
  rtc: tegra: Drop MODULE_ALIAS
  rtc: sun6i: Add R40 compatible
  dt-bindings: rtc: sun6i: Add the R40 RTC compatible
  dt-bindings: rtc: Convert Allwinner A31 RTC to a schema
  ...

Pull dmaengine updates from Vinod Koul:

 - Add support in dmaengine core to do device node checks for DT devices
   and update bunch of drivers to use that and remove open coding from
   drivers

 - New driver/driver support for new hardware, namely:
     - MediaTek UART APDMA
     - Freescale i.mx7ulp edma2
     - Synopsys eDMA IP core version 0
     - Allwinner H6 DMA

 - Updates to axi-dma and support for interleaved cyclic transfers

 - Greg's debugfs return value check removals on drivers

 - Updates to stm32-dma, hsu, dw, pl330, tegra drivers

* tag 'dmaengine-5.3-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (68 commits)
  dmaengine: Revert "dmaengine: fsl-edma: add i.mx7ulp edma2 version support"
  dmaengine: at_xdmac: check for non-empty xfers_list before invoking callback
  Documentation: dmaengine: clean up description of dmatest usage
  dmaengine: tegra210-adma: remove PM_CLK dependency
  dmaengine: fsl-edma: add i.mx7ulp edma2 version support
  dt-bindings: dma: fsl-edma: add new i.mx7ulp-edma
  dmaengine: fsl-edma-common: version check for v2 instead
  dmaengine: fsl-edma-common: move dmamux register to another single function
  dmaengine: fsl-edma: add drvdata for fsl-edma
  dmaengine: Revert "dmaengine: fsl-edma: support little endian for edma driver"
  dmaengine: rcar-dmac: Reject zero-length slave DMA requests
  dmaengine: dw: Enable iDMA 32-bit on Intel Elkhart Lake
  dmaengine: dw-edma: fix semicolon.cocci warnings
  dmaengine: sh: usb-dmac: Use [] to denote a flexible array member
  dmaengine: dmatest: timeout value of -1 should specify infinite wait
  dmaengine: dw: Distinguish ->remove() between DW and iDMA 32-bit
  dmaengine: fsl-edma: support little endian for edma driver
  dmaengine: hsu: Revert "set HSU_CH_MTSR to memory width"
  dmagengine: pl330: add code to get reset property
  dt-bindings: pl330: document the optional resets property
  ...

Pull MIPS updates from Paul Burton:
 "A light batch this time around but significant improvements for
  certain systems:

   - Removal of readq & writeq for MIPS32 kernels where they would
     simply BUG() anyway, allowing drivers or other code that #ifdefs on
     their presence to work properly.

   - Improvements for Ingenic JZ4740 systems, including support for the
     external memory controller & pinmuxing fixes for qi_lb60/NanoNote
     systems.

   - Improvements for Lantiq systems, in particular around SMP & IPIs.

   - DT updates for ralink/MediaTek MT7628a systems to probe & configure
     a bunch more devices.

   - Miscellaneous cleanups & build fixes"

* tag 'mips_5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (30 commits)
  MIPS: fix some more fall through errors in arch/mips
  MIPS: perf events: handle switch statement falling through warnings
  mips/kprobes: Export kprobe_fault_handler()
  MAINTAINERS: Add myself as Ingenic SoCs maintainer
  MIPS: ralink: mt7628a.dtsi: Add watchdog controller DT node
  MIPS: ralink: mt7628a.dtsi: Add SPI controller DT node
  MIPS: ralink: mt7628a.dtsi: Add GPIO controller DT node
  MIPS: ralink: mt7628a.dtsi: Add pinctrl DT properties to the UART nodes
  MIPS: ralink: mt7628a.dtsi: Add pinmux DT node
  MIPS: ralink: mt7628a.dtsi: Add SPDX GPL-2.0 license identifier
  MIPS: lantiq: Add SMP support for lantiq interrupt controller
  MIPS: lantiq: Shorten register names, remove unused macros
  MIPS: lantiq: Fix bitfield masking
  MIPS: lantiq: Remove unused macros
  MIPS: lantiq: Fix attributes of of_device_id structure
  MIPS: lantiq: Change variables to the same type as the source
  MIPS: lantiq: Move macro directly to iomem function
  mips: Remove q-accessors from non-64bit platforms
  FDDI: defza: Include linux/io-64-nonatomic-lo-hi.h
  MIPS: configs: Remove useless UEVENT_HELPER_PATH
  ...

Pull h8300 update from Yoshinori Sato:
 "Remove unused barrier defines"

* tag 'h8300-for-linus-20190617' of git://git.sourceforge.jp/gitroot/uclinux-h8/linux:
  H8300: remove unused barrier defines

Pull SH updates from Yoshinori Sato.

kprobe fix, defconfig updates and a SH Kconfig fix.

* tag 'for-linus-20190617' of git://git.sourceforge.jp/gitroot/uclinux-h8/linux:
  arch/sh: Check for kprobe trap number before trying to handle a kprobe trap
  sh: configs: Remove useless UEVENT_HELPER_PATH
  Fix allyesconfig output.

The Asus WMI spec indicates that the function being controlled here
is called "Fan Boost Mode". The user-facing documentation also calls it
this.

The spec uses the term "fan mode" is used to refer to other things,
including functionality expected to appear on future products.
We missed this before as we are not dealing with the most readable of
specs, and didn't forsee any confusion around shortening the name.

Rename "fan mode" to "fan boost mode" to improve consistency with the
spec and to avoid a future naming conflict.

There is no interface breakage here since this has yet to be included
in an official kernel release. I also updated the kernel version listed
under ABI accordingly.
Signed-off-by: Daniel Drake <drake@endlessm.com>
Acked-by: Yurii Pavlovskyi <yurii.pavlovskyi@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Merge more updates from Andrew Morton:
 "VM:
   - z3fold fixes and enhancements by Henry Burns and Vitaly Wool

   - more accurate reclaimed slab caches calculations by Yafang Shao

   - fix MAP_UNINITIALIZED UAPI symbol to not depend on config, by
     Christoph Hellwig

   - !CONFIG_MMU fixes by Christoph Hellwig

   - new novmcoredd parameter to omit device dumps from vmcore, by
     Kairui Song

   - new test_meminit module for testing heap and pagealloc
     initialization, by Alexander Potapenko

   - ioremap improvements for huge mappings, by Anshuman Khandual

   - generalize kprobe page fault handling, by Anshuman Khandual

   - device-dax hotplug fixes and improvements, by Pavel Tatashin

   - enable synchronous DAX fault on powerpc, by Aneesh Kumar K.V

   - add pte_devmap() support for arm64, by Robin Murphy

   - unify locked_vm accounting with a helper, by Daniel Jordan

   - several misc fixes

  core/lib:
   - new typeof_member() macro including some users, by Alexey Dobriyan

   - make BIT() and GENMASK() available in asm, by Masahiro Yamada

   - changed LIST_POISON2 on x86_64 to 0xdead000000000122 for better
     code generation, by Alexey Dobriyan

   - rbtree code size optimizations, by Michel Lespinasse

   - convert struct pid count to refcount_t, by Joel Fernandes

  get_maintainer.pl:
   - add --no-moderated switch to skip moderated ML's, by Joe Perches

  misc:
   - ptrace PTRACE_GET_SYSCALL_INFO interface

   - coda updates

   - gdb scripts, various"

[ Using merge message suggestion from Vlastimil Babka, with some editing - Linus ]

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (100 commits)
  fs/select.c: use struct_size() in kmalloc()
  mm: add account_locked_vm utility function
  arm64: mm: implement pte_devmap support
  mm: introduce ARCH_HAS_PTE_DEVMAP
  mm: clean up is_device_*_page() definitions
  mm/mmap: move common defines to mman-common.h
  mm: move MAP_SYNC to asm-generic/mman-common.h
  device-dax: "Hotremove" persistent memory that is used like normal RAM
  mm/hotplug: make remove_memory() interface usable
  device-dax: fix memory and resource leak if hotplug fails
  include/linux/lz4.h: fix spelling and copy-paste errors in documentation
  ipc/mqueue.c: only perform resource calculation if user valid
  include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures
  scripts/gdb: add helpers to find and list devices
  scripts/gdb: add lx-genpd-summary command
  drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl
  kernel/pid.c: convert struct pid count to refcount_t
  drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings
  select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining()
  select: change do_poll() to return -ERESTARTNOHAND rather than -EINTR
  ...

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array.  For example:

  struct foo {
       int stuff;
       struct boo entry[];
  };

  size = sizeof(struct foo) + count * sizeof(struct boo);
  instance = kmalloc(size, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can now
use the new struct_size() helper:

  instance = kmalloc(struct_size(instance, entry, count), GFP_KERNEL);

Also, notice that variable size is unnecessary, hence it is removed.

This code was detected with the help of Coccinelle.

Link: http://lkml.kernel.org/r/20190604164226.GA13823@embeddedorSigned-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

locked_vm accounting is done roughly the same way in five places, so
unify them in a helper.

Include the helper's caller in the debug print to distinguish between
callsites.

Error codes stay the same, so user-visible behavior does too.  The one
exception is that the -EPERM case in tce_account_locked_vm is removed
because Alexey has never seen it triggered.

[daniel.m.jordan@oracle.com: v3]
  Link: http://lkml.kernel.org/r/20190529205019.20927-1-daniel.m.jordan@oracle.com
[sfr@canb.auug.org.au: fix mm/util.c]
Link: http://lkml.kernel.org/r/20190524175045.26897-1-daniel.m.jordan@oracle.comSigned-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Cc: Alan Tull <atull@kernel.org>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Moritz Fischer <mdf@kernel.org>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Steve Sistare <steven.sistare@oracle.com>
Cc: Wu Hao <hao.wu@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

In order for things like get_user_pages() to work on ZONE_DEVICE memory,
we need a software PTE bit to identify device-backed PFNs.  Hook this up
along with the relevant helpers to join in with ARCH_HAS_PTE_DEVMAP.

[robin.murphy@arm.com: build fixes]
  Link: http://lkml.kernel.org/r/13026c4e64abc17133bbfa07d7731ec6691c0bcd.1559050949.git.robin.murphy@arm.com
Link: http://lkml.kernel.org/r/817d92886fc3b33bcbf6e105ee83a74babb3a5aa.1558547956.git.robin.murphy@arm.comSigned-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

ARCH_HAS_ZONE_DEVICE is somewhat meaningless in itself, and combined
with the long-out-of-date comment can lead to the impression than an
architecture may just enable it (since __add_pages() now "comprehends
device memory" for itself) and expect things to work.

In practice, however, ZONE_DEVICE users have little chance of
functioning correctly without __HAVE_ARCH_PTE_DEVMAP, so let's clean
that up the same way as ARCH_HAS_PTE_SPECIAL and make it the proper
dependency so the real situation is clearer.

Link: http://lkml.kernel.org/r/87554aa78478a02a63f2c4cf60a847279ae3eb3b.1558547956.git.robin.murphy@arm.comSigned-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Acked-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Refactor is_device_{public,private}_page() with is_pci_p2pdma_page() to
make them all consistent in depending on their respective config options
even when CONFIG_DEV_PAGEMAP_OPS is enabled for other reasons.  This
allows a little more compile-time optimisation as well as the conceptual
and cosmetic cleanup.

Link: http://lkml.kernel.org/r/187c2ab27dea70635d375a61b2f2076d26c032b0.1558547956.git.robin.murphy@arm.comSigned-off-by: Robin Murphy <robin.murphy@arm.com>
Suggested-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oliver O'Halloran <oohall@gmail.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Two architecture that use arch specific MMAP flags are powerpc and
sparc.  We still have few flag values common across them and other
architectures.  Consolidate this in mman-common.h.

Also update the comment to indicate where to find HugeTLB specific
reserved values

Link: http://lkml.kernel.org/r/20190604090950.31417-1-aneesh.kumar@linux.ibm.comSigned-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This enables support for synchronous DAX fault on powerpc

The generic changes are added as part of b6fb293f ("mm: Define
MAP_SYNC and VM_SYNC flags")

Without this, mmap returns EOPNOTSUPP for MAP_SYNC with
MAP_SHARED_VALIDATE

Instead of adding MAP_SYNC with same value to
arch/powerpc/include/uapi/asm/mman.h, I am moving the #define to
asm-generic/mman-common.h.  Two architectures using mman-common.h
directly are sparc and powerpc.  We should be able to consloidate more
#defines to mman-common.h.  That can be done as a separate patch.

Link: http://lkml.kernel.org/r/20190528091120.13322-1-aneesh.kumar@linux.ibm.comSigned-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

It is now allowed to use persistent memory like a regular RAM, but
currently there is no way to remove this memory until machine is
rebooted.

This work expands the functionality to also allows hotremoving
previously hotplugged persistent memory, and recover the device for use
for other purposes.

To hotremove persistent memory, the management software must first
offline all memory blocks of dax region, and than unbind it from
device-dax/kmem driver.  So, operations should look like this:

  echo offline > /sys/devices/system/memory/memoryN/state
  ...
  echo dax0.0 > /sys/bus/dax/drivers/kmem/unbind

Note: if unbind is done without offlining memory beforehand, it won't be
possible to do dax0.0 hotremove, and dax's memory is going to be part of
System RAM until reboot.

Link: http://lkml.kernel.org/r/20190517215438.6487-4-pasha.tatashin@soleen.comSigned-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: James Morris <jmorris@namei.org>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Ross Zwisler <zwisler@kernel.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Presently the remove_memory() interface is inherently broken.  It tries
to remove memory but panics if some memory is not offline.  The problem
is that it is impossible to ensure that all memory blocks are offline as
this function also takes lock_device_hotplug that is required to change
memory state via sysfs.

So, between calling this function and offlining all memory blocks there
is always a window when lock_device_hotplug is released, and therefore,
there is always a chance for a panic during this window.

Make this interface to return an error if memory removal fails.  This
way it is safe to call this function without panicking machine, and also
makes it symmetric to add_memory() which already returns an error.

Link: http://lkml.kernel.org/r/20190517215438.6487-3-pasha.tatashin@soleen.comSigned-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Ross Zwisler <zwisler@kernel.org>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Patch series ""Hotremove" persistent memory", v6.

Recently, adding a persistent memory to be used like a regular RAM was
added to Linux.  This work extends this functionality to also allow hot
removing persistent memory.

We (Microsoft) have an important use case for this functionality.

The requirement is for physical machines with small amount of RAM (~8G)
to be able to reboot in a very short period of time (<1s).  Yet, there
is a userland state that is expensive to recreate (~2G).

The solution is to boot machines with 2G preserved for persistent
memory.

Copy the state, and hotadd the persistent memory so machine still has
all 8G available for runtime.  Before reboot, offline and hotremove
device-dax 2G, copy the memory that is needed to be preserved to pmem0
device, and reboot.

The series of operations look like this:

1. After boot restore /dev/pmem0 to ramdisk to be consumed by apps.
   and free ramdisk.
2. Convert raw pmem0 to devdax
   ndctl create-namespace --mode devdax --map mem -e namespace0.0 -f
3. Hotadd to System RAM
   echo dax0.0 > /sys/bus/dax/drivers/device_dax/unbind
   echo dax0.0 > /sys/bus/dax/drivers/kmem/new_id
   echo online_movable > /sys/devices/system/memoryXXX/state
4. Before reboot hotremove device-dax memory from System RAM
   echo offline > /sys/devices/system/memoryXXX/state
   echo dax0.0 > /sys/bus/dax/drivers/kmem/unbind
5. Create raw pmem0 device
   ndctl create-namespace --mode raw  -e namespace0.0 -f
6. Copy the state that was stored by apps to ramdisk to pmem device
7. Do kexec reboot or reboot through firmware if firmware does not
   zero memory in pmem0 region (These machines have only regular
   volatile memory). So to have pmem0 device either memmap kernel
   parameter is used, or devices nodes in dtb are specified.

This patch (of 3):

When add_memory() fails, the resource and the memory should be freed.

Link: http://lkml.kernel.org/r/20190517215438.6487-2-pasha.tatashin@soleen.com
Fixes: c221c0b0 ("device-dax: "Hotplug" persistent memory for use like normal RAM")
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Ross Zwisler <zwisler@kernel.org>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Fix a few spelling and grammar errors, and two places where fast/safe in
the documentation did not match the function.

Link: http://lkml.kernel.org/r/20190321014452.13297-1-tomlevy93@gmail.comSigned-off-by: Tom Levy <tomlevy93@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Kosina <trivial@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Andreas Christoforou reported:

  UBSAN: Undefined behaviour in ipc/mqueue.c:414:49 signed integer overflow:
  9 * 2305843009213693951 cannot be represented in type 'long int'
  ...
  Call Trace:
    mqueue_evict_inode+0x8e7/0xa10 ipc/mqueue.c:414
    evict+0x472/0x8c0 fs/inode.c:558
    iput_final fs/inode.c:1547 [inline]
    iput+0x51d/0x8c0 fs/inode.c:1573
    mqueue_get_inode+0x8eb/0x1070 ipc/mqueue.c:320
    mqueue_create_attr+0x198/0x440 ipc/mqueue.c:459
    vfs_mkobj+0x39e/0x580 fs/namei.c:2892
    prepare_open ipc/mqueue.c:731 [inline]
    do_mq_open+0x6da/0x8e0 ipc/mqueue.c:771

Which could be triggered by:

        struct mq_attr attr = {
                .mq_flags = 0,
                .mq_maxmsg = 9,
                .mq_msgsize = 0x1fffffffffffffff,
                .mq_curmsgs = 0,
        };

        if (mq_open("/testing", 0x40, 3, &attr) == (mqd_t) -1)
                perror("mq_open");

mqueue_get_inode() was correctly rejecting the giant mq_msgsize, and
preparing to return -EINVAL.  During the cleanup, it calls
mqueue_evict_inode() which performed resource usage tracking math for
updating "user", before checking if there was a valid "user" at all
(which would indicate that the calculations would be sane).  Instead,
delay this check to after seeing a valid "user".

The overflow was real, but the results went unused, so while the flaw is
harmless, it's noisy for kernel fuzzers, so just fix it by moving the
calculation under the non-NULL "user" where it actually gets used.

Link: http://lkml.kernel.org/r/201906072207.ECB65450@keescookSigned-off-by: Kees Cook <keescook@chromium.org>
Reported-by: Andreas Christoforou <andreaschristofo@gmail.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>