When KASLR is enabled then 1GB huge pages allocations might regress
sporadically.

To reproduce on a KVM guest with 4GB RAM:

- add the following options to the kernel command-line:

   'default_hugepagesz=1G hugepagesz=1G hugepages=1'

- boot the guest and check number of 1GB pages reserved:

    # grep HugePages_Total /proc/meminfo

- sporadically, every couple of bootups the output of this
  command shows that when booting with "nokaslr" HugePages_Total is always 1,
  while booting without "nokaslr" sometimes HugePages_Total is set as 0
  (that is, reserving the 1GB page failed).

Note that you may need to boot a few times to trigger the issue,
because it's somewhat non-deterministic.

The root cause is that kernel may be put into the only good 1GB huge page
in the [0x40000000, 0x7fffffff] physical range randomly.

Below is the dmesg output snippet from the KVM guest. We can see that only
[0x40000000, 0x7fffffff] region is good 1GB huge page,
[0x100000000, 0x13fffffff] will be touched by the memblock top-down allocation:

[...] e820: BIOS-provided physical RAM map:
[...] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[...] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[...] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[...] BIOS-e820: [mem 0x0000000000100000-0x00000000bffdffff] usable
[...] BIOS-e820: [mem 0x00000000bffe0000-0x00000000bfffffff] reserved
[...] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[...] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[...] BIOS-e820: [mem 0x0000000100000000-0x000000013fffffff] usable

Besides, on bare-metal machines with larger memory, one less 1GB huge page
might be available with KASLR enabled. That too is because the kernel
image might be randomized into those "good" 1GB huge pages.

To fix this, firstly parse the kernel command-line to get how many 1GB huge
pages are specified. Then try to skip the specified number of 1GB huge
pages when decide which memory region kernel can be randomized into.

Also change the name of handle_mem_memmap() as handle_mem_options()
since it handles not only 'mem=' and 'memmap=', but also 'hugepagesxxx' now.
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: douly.fnst@cn.fujitsu.com
Cc: fanc.fnst@cn.fujitsu.com
Cc: indou.takao@jp.fujitsu.com
Cc: keescook@chromium.org
Cc: lcapitulino@redhat.com
Cc: yasu.isimatu@gmail.com
Link: http://lkml.kernel.org/r/20180625031656.12443-3-bhe@redhat.com
[ Rewrote the changelog, fixed style problems in the code. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

Introduce two new functions: parse_gb_huge_pages() and process_gb_huge_pages(),
which handle a conflict between KASLR and huge pages of 1GB.

These two functions will be used in the next patch:

- parse_gb_huge_pages() is used to parse kernel command-line to get
  how many 1GB huge pages have been specified. A static global
  variable 'max_gb_huge_pages' is added to store the number.

- process_gb_huge_pages() is used to skip as many 1GB huge pages
  as possible from the passed in memory region according to the
  specified number.
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: douly.fnst@cn.fujitsu.com
Cc: fanc.fnst@cn.fujitsu.com
Cc: indou.takao@jp.fujitsu.com
Cc: keescook@chromium.org
Cc: lcapitulino@redhat.com
Cc: yasu.isimatu@gmail.com
Link: http://lkml.kernel.org/r/20180625031656.12443-2-bhe@redhat.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

Pull btrfs fixes from David Sterba:
 "We have a few regression fixes for qgroup rescan status tracking and
  the vm_fault_t conversion that mixed up the error values"

* tag 'for-4.18-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  Btrfs: fix mount failure when qgroup rescan is in progress
  Btrfs: fix regression in btrfs_page_mkwrite() from vm_fault_t conversion
  btrfs: quota: Set rescan progress to (u64)-1 if we hit last leaf

Pull vfs fix from Al Viro:
 "Followup to procfs-seq_file series this window"

This fixes a memory leak by making sure that proc seq files release any
private data on close.  The 'proc_seq_open' has to be properly paired
with 'proc_seq_release' that releases the extra private data.

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  proc: add proc_seq_release

Pull staging/IIO fixes from Greg KH:
 "Here are a few small staging and IIO driver fixes for 4.18-rc3.

  Nothing major or big, all just fixes for reported problems since
  4.18-rc1. All of these have been in linux-next this week with no
  reported problems"

* tag 'staging-4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: android: ion: Return an ERR_PTR in ion_map_kernel
  staging: comedi: quatech_daqp_cs: fix no-op loop daqp_ao_insn_write()
  iio: imu: inv_mpu6050: Fix probe() failure on older ACPI based machines
  iio: buffer: fix the function signature to match implementation
  iio: mma8452: Fix ignoring MMA8452_INT_DRDY
  iio: tsl2x7x/tsl2772: avoid potential division by zero
  iio: pressure: bmp280: fix relative humidity unit

Pull tty/serial fixes from Greg KH:
 "Here are five fixes for the tty core and some serial drivers.

  The tty core ones fix some security and other issues reported by the
  syzbot that I have taken too long in responding to (sorry Tetsuo!).

  The 8350 serial driver fix resolves an issue of devices that used to
  work properly stopping working as they shouldn't have been added to a
  blacklist.

  All of these have been in linux-next for a few days with no reported
  issues"

* tag 'tty-4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  vt: prevent leaking uninitialized data to userspace via /dev/vcs*
  serdev: fix memleak on module unload
  serial: 8250_pci: Remove stalled entries in blacklist
  n_tty: Access echo_* variables carefully.
  n_tty: Fix stall at n_tty_receive_char_special().

Pull USB fixes from Greg KH:
 "Here is a number of USB gadget and other driver fixes for 4.18-rc3.

  There's a bunch of them here, most of them being gadget driver and
  xhci host controller fixes for reported issues (as normal), but there
  are also some new device ids, and some fixes for the typec code.

  There is an acpi core patch in here that was acked by the acpi
  maintainer as it is needed for the typec fixes in order to properly
  solve a problem in that driver.

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

* tag 'usb-4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (33 commits)
  usb: chipidea: host: fix disconnection detect issue
  usb: typec: tcpm: fix logbuffer index is wrong if _tcpm_log is re-entered
  typec: tcpm: Fix a msecs vs jiffies bug
  NFC: pn533: Fix wrong GFP flag usage
  usb: cdc_acm: Add quirk for Uniden UBC125 scanner
  staging/typec: fix tcpci_rt1711h build errors
  usb: typec: ucsi: Fix for incorrect status data issue
  usb: typec: ucsi: acpi: Workaround for cache mode issue
  acpi: Add helper for deactivating memory region
  usb: xhci: increase CRS timeout value
  usb: xhci: tegra: fix runtime PM error handling
  usb: xhci: remove the code build warning
  xhci: Fix kernel oops in trace_xhci_free_virt_device
  xhci: Fix perceived dead host due to runtime suspend race with event handler
  dwc2: gadget: Fix ISOC IN DDMA PID bitfield value calculation
  usb: gadget: dwc2: fix memory leak in gadget_init()
  usb: gadget: composite: fix delayed_status race condition when set_interface
  usb: dwc2: fix isoc split in transfer with no data
  usb: dwc2: alloc dma aligned buffer for isoc split in
  usb: dwc2: fix the incorrect bitmaps for the ports of multi_tt hub
  ...

Pull dma mapping fixlet from Christoph Hellwig:
 "Add a missing export required by riscv and unicore"

* tag 'dma-mapping-4.18-2' of git://git.infradead.org/users/hch/dma-mapping:
  swiotlb: export swiotlb_dma_ops

Pull parisc fixes and cleanups from Helge Deller:
 "Nothing exiting in this patchset, just

   - small cleanups of header files

   - default to 4 CPUs when building a SMP kernel

   - mark 16kB and 64kB page sizes broken

   - addition of the new io_pgetevents syscall"

* 'parisc-4.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Build kernel without -ffunction-sections
  parisc: Reduce debug output in unwind code
  parisc: Wire up io_pgetevents syscall
  parisc: Default to 4 SMP CPUs
  parisc: Convert printk(KERN_LEVEL) to pr_lvl()
  parisc: Mark 16kB and 64kB page sizes BROKEN
  parisc: Drop struct sigaction from not exported header file

Pull ARM SoC fixes from Olof Johansson:
 "A smaller batch for the end of the week (let's see if I can keep the
  weekly cadence going for once).

  All medium-grade fixes here, nothing worrisome:

   - Fixes for some fairly old bugs around SD card write-protect
     detection and GPIO interrupt assignments on Davinci.

   - Wifi module suspend fix for Hikey.

   - Minor DT tweaks to fix inaccuracies for Amlogic platforms, one
     of which solves booting with third-party u-boot"

* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  arm64: dts: hikey960: Define wl1837 power capabilities
  arm64: dts: hikey: Define wl1835 power capabilities
  ARM64: dts: meson-gxl: fix Mali GPU compatible string
  ARM64: dts: meson-axg: fix ethernet stability issue
  ARM64: dts: meson-gx: fix ATF reserved memory region
  ARM64: dts: meson-gxl-s905x-p212: Add phy-supply for usb0
  ARM64: dts: meson: fix register ranges for SD/eMMC
  ARM64: dts: meson: disable sd-uhs modes on the libretech-cc
  ARM: dts: da850: Fix interrups property for gpio
  ARM: davinci: board-da850-evm: fix WP pin polarity for MMC/SD

Merge tag 'kbuild-fixes-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - introduce __diag_* macros and suppress -Wattribute-alias warnings
   from GCC 8

 - fix stack protector test script for x86_64

 - fix line number handling in Kconfig

 - document that '#' starts a comment in Kconfig

 - handle P_SYMBOL property in dump debugging of Kconfig

 - correct help message of LD_DEAD_CODE_DATA_ELIMINATION

 - fix occasional segmentation faults in Kconfig

* tag 'kbuild-fixes-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kconfig: loop boundary condition fix
  kbuild: reword help of LD_DEAD_CODE_DATA_ELIMINATION
  kconfig: handle P_SYMBOL in print_symbol()
  kconfig: document Kconfig source file comments
  kconfig: fix line numbers for if-entries in menu tree
  stack-protector: Fix test with 32-bit userland and CONFIG_64BIT=y
  powerpc: Remove -Wattribute-alias pragmas
  disable -Wattribute-alias warning for SYSCALL_DEFINEx()
  kbuild: add macro for controlling warnings to linux/compiler.h

Pull x86 fixes from Ingo Molnar:
 "The biggest diffstat comes from self-test updates, plus there's entry
  code fixes, 5-level paging related fixes, console debug output fixes,
  and misc fixes"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Clean up the printk()s in show_fault_oops()
  x86/mm: Drop unneeded __always_inline for p4d page table helpers
  x86/efi: Fix efi_call_phys_epilog() with CONFIG_X86_5LEVEL=y
  selftests/x86/sigreturn: Do minor cleanups
  selftests/x86/sigreturn/64: Fix spurious failures on AMD CPUs
  x86/entry/64/compat: Fix "x86/entry/64/compat: Preserve r8-r11 in int $0x80"
  x86/mm: Don't free P4D table when it is folded at runtime
  x86/entry/32: Add explicit 'l' instruction suffix
  x86/mm: Get rid of KERN_CONT in show_fault_oops()

Pull perf fixes from Ingo Molnar:
 "Tooling fixes mostly, plus a build warning fix"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (21 commits)
  perf/core: Move inline keyword at the beginning of declaration
  tools/headers: Pick up latest kernel ABIs
  perf tools: Fix crash caused by accessing feat_ops[HEADER_LAST_FEATURE]
  perf script: Fix crash because of missing evsel->priv
  perf script: Add missing output fields in a hint
  perf bench: Fix numa report output code
  perf stat: Remove duplicate event counting
  perf alias: Rebuild alias expression string to make it comparable
  perf alias: Remove trailing newline when reading sysfs files
  perf tools: Fix a clang 7.0 compilation error
  tools include uapi: Synchronize bpf.h with the kernel
  tools include uapi: Update if_link.h to pick IFLA_{BRPORT_ISOLATED,VXLAN_TTL_INHERIT}
  tools include powerpc: Update arch/powerpc/include/uapi/asm/unistd.h copy to get 'rseq' syscall
  perf tools: Update x86's syscall_64.tbl, adding 'io_pgetevents' and 'rseq'
  tools headers uapi: Synchronize drm/drm.h
  perf intel-pt: Fix packet decoding of CYC packets
  perf tests: Add valid callback for parse-events test
  perf tests: Add event parsing error handling to parse events test
  perf report powerpc: Fix crash if callchain is empty
  perf test session topology: Fix test on s390
  ...

Pull selinux fix from Paul Moore:
 "One fairly straightforward patch to fix a longstanding issue where a
  process could stall while accessing files in selinuxfs and block
  everyone else due to a held mutex.

  The patch passes all our tests and looks to apply cleanly to your
  current tree"

* tag 'selinux-pr-20180629' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: move user accesses in selinuxfs out of locked regions

Pull block fixes from Jens Axboe:
 "Small set of fixes for this series. Mostly just minor fixes, the only
  oddball in here is the sg change.

  The sg change came out of the stall fix for NVMe, where we added a
  mempool and limited us to a single page allocation. CONFIG_SG_DEBUG
  sort-of ruins that, since we'd need to account for that. That's
  actually a generic problem, since lots of drivers need to allocate SG
  lists. So this just removes support for CONFIG_SG_DEBUG, which I added
  back in 2007 and to my knowledge it was never useful.

  Anyway, outside of that, this pull contains:

   - clone of request with special payload fix (Bart)

   - drbd discard handling fix (Bart)

   - SATA blk-mq stall fix (me)

   - chunk size fix (Keith)

   - double free nvme rdma fix (Sagi)"

* tag 'for-linus-20180629' of git://git.kernel.dk/linux-block:
  sg: remove ->sg_magic member
  drbd: Fix drbd_request_prepare() discard handling
  blk-mq: don't queue more if we get a busy return
  block: Fix cloning of requests with a special payload
  nvme-rdma: fix possible double free of controller async event buffer
  block: Fix transfer when chunk sectors exceeds max

Pull powerpc fixes from Michael Ellerman:
 "Two regression fixes, and a new syscall wire-up:

   - A fix for the recent conversion to time64_t in the powermac RTC
     routines, which caused time to go backward.

   - Another fix for fallout from the split PMD PTL conversion.

   - Wire up the new io_pgetevents() syscall.

  Thanks to: Aneesh Kumar K.V, Arnd Bergmann, Breno Leitao, Mathieu
  Malaterre"

* tag 'powerpc-4.18-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/powermac: Fix rtc read/write functions
  powerpc/mm/32: Fix pgtable_page_dtor call
  powerpc: Wire up io_pgetevents

Merge tag 'davinci-fixes-for-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci into fixes

This fixes polarity of SD card write-protect pin on DA850 EVM
and fixes interrupt property for DA850 SoC GPIO as defined in
device-tree.

Both of these are not introduced with v4.18 merge but have
existed prior.

* tag 'davinci-fixes-for-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nsekhar/linux-davinci:
  ARM: dts: da850: Fix interrups property for gpio
  ARM: davinci: board-da850-evm: fix WP pin polarity for MMC/SD
Signed-off-by: Olof Johansson <olof@lixom.net>

ARM64: hisi fixes for 4.18

- Added power capabilities for the mmc host controller on the
  hikey and hikey960 boards to avoid broken wifi.

* tag 'hisi-fixes-for-4.18' of git://github.com/hisilicon/linux-hisi:
  arm64: dts: hikey960: Define wl1837 power capabilities
  arm64: dts: hikey: Define wl1835 power capabilities
Signed-off-by: Olof Johansson <olof@lixom.net>

Merge tag 'amlogic-fixes' of https://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-amlogic into fixes

Amlogic fixes for v4.18-rc
- minor 64-bit DT fixes

* tag 'amlogic-fixes' of https://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-amlogic:
  ARM64: dts: meson-gxl: fix Mali GPU compatible string
  ARM64: dts: meson-axg: fix ethernet stability issue
  ARM64: dts: meson-gx: fix ATF reserved memory region
  ARM64: dts: meson-gxl-s905x-p212: Add phy-supply for usb0
  ARM64: dts: meson: fix register ranges for SD/eMMC
  ARM64: dts: meson: disable sd-uhs modes on the libretech-cc
Signed-off-by: Olof Johansson <olof@lixom.net>

Pull arm64 fixes from Catalin Marinas:

 - The alternatives patching code uses flush_icache_range() which itself
   uses alternatives. Change the code to use an unpatched variant of
   cache maintenance

 - Remove unnecessary ISBs from set_{pte,pmd,pud}

 - perf: xgene_pmu: Fix IOB SLOW PMU parser error

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Remove unnecessary ISBs from set_{pte,pmd,pud}
  arm64: Avoid flush_icache_range() in alternatives patching code
  drivers/perf: xgene_pmu: Fix IOB SLOW PMU parser error

Pull i2c fixes from Wolfram Sang:

 - a revert because of bugzilla #200045 (and some documentation about
   it)

 - another regression fix in the i2c-gpio driver

 - a leak fix for the i2c core

* 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: gpio: initialize SCL to HIGH again
  i2c: smbus: kill memory leak on emulated and failed DMA SMBus xfers
  i2c: algos: bit: mention our experience about initial states
  Revert "i2c: algo-bit: init the bus to a known state"

Pull ceph fix from Ilya Dryomov:
 "A trivial dentry leak fix from Zheng"

* tag 'ceph-for-4.18-rc3' of git://github.com/ceph/ceph-client:
  ceph: fix dentry leak in splice_dentry()

As suggested by Nick Piggin it seems we can drop the -ffunction-sections
compile flag, now that the kernel uses thin archives. Testing with 32-
and 64-bit kernel showed no difference in kernel size.
Suggested-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>

This was introduced more than a decade ago when sg chaining was
added, but we never really caught anything with it. The scatterlist
entry size can be critical, since drivers allocate it, so remove
the magic member. Recently it's been triggering allocation stalls
and failures in NVMe.
Tested-by: Jordan Glover <Golden_Miller83@protonmail.ch>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Pull PCI fixes from Bjorn Helgaas:

 - Fix crash caused by endpoint library initialization order change
   (Alan Douglas)

 - Fix shpchp NULL pointer dereference regression on non-ACPI platforms
   (Bjorn Helgaas)

 - Move PCI_DOMAINS selection to fix build regression (Lorenzo
   Pieralisi)

* tag 'pci-v4.18-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: controller: Move PCI_DOMAINS selection to arch Kconfig
  PCI: Initialize endpoint library before controllers
  PCI: shpchp: Manage SHPC unconditionally on non-ACPI systems

Pull power management fixes from Rafael Wysocki:
 "These fix up recently added features (the Kryo cpufreq driver and
  performance states coverage in the generic power domains framework),
  add missing documentation for a recently added sysfs knob in the
  intel_pstate driver and fix an error in its documentation.

  Specifics:

   - Fix the initialization time error handling in the recently added
     Kryo cpufreq driver (Dan Carpenter).

   - Fix up the recently added coverage of performance states in the
     generic power domains (genpd) framework (Viresh Kumar).

   - Add missing documentation of the new hwp_dynamic_boost sysfs knob
     in the intel_pstate driver (Rafael Wysocki).

   - Fix incorrect sysfs path in the intel_pstate driver documentation
     (Rafael Wysocki)"

* tag 'pm-4.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Documentation: intel_pstate: Describe hwp_dynamic_boost sysfs knob
  Documentation: admin-guide: intel_pstate: Fix sysfs path
  PM / Domains: Rename opp_node to np
  PM / Domains: Fix return value of of_genpd_opp_to_performance_state()
  cpufreq: qcom-kryo: Fix error handling in probe()

Pull drm fixes from Dave Airlie:
 "Nothing too major this round:

   - small set of mali-dp fixes

   - single meson fix

   - a bunch of amdgpu fixes (one makes non-4k page sizes not be a bad
     experience)"

* tag 'drm-fixes-2018-06-29' of git://anongit.freedesktop.org/drm/drm:
  drm/amd/display: release spinlock before committing updates to stream
  drm/amdgpu:Support new VCN FW version naming convention
  drm/amdgpu: fix UBSAN: Undefined behaviour for amdgpu_fence.c
  drm/meson: Fix an un-handled error path in 'meson_drv_bind_master()'
  drm/amdgpu: GPU vs CPU page size fixes in amdgpu_vm_bo_split_mapping
  drm/amdgpu: Count disabled CRTCs in commit tail earlier
  drm/mali-dp: Rectify the width and height passed to rotmem_required()
  drm/arm/malidp: Preserve LAYER_FORMAT contents when setting format
  drm: mali-dp: Enable Global SE interrupts mask for DP500
  drm/arm/malidp: Ensure that the crtcs are shutdown before removing any encoder/connector

Merge tag 'for-4.18/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - Fix dm core to use more efficient bio_split() instead of
   bio_clone_bioset(). Also fixes splitting bio that has integrity
   payload.

 - Three fixes related to properly validating DAX capabilities of a
   stacked DM device that will advertise DAX support.

 - Update DM writecache target to use 2-factor allocator arguments. Kees
   says this is the last related change for 4.18.

 - Fix DM zoned target to use GFP_NOIO to avoid triggering reclaim
   during IO submission (caught by lockdep).

 - Fix DM thinp to gracefully recover from running out of data space
   while a previous async discard completes (whereby freeing space).

 - Fix DM thinp's metadata transaction commit to avoid needless work.

* tag 'for-4.18/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: prevent DAX mounts if not supported
  dax: check for QUEUE_FLAG_DAX in bdev_dax_supported()
  pmem: only set QUEUE_FLAG_DAX for fsdax mode
  dm thin: handle running out of data space vs concurrent discard
  dm raid: don't use 'const' in function return
  dm zoned: avoid triggering reclaim from inside dmz_map()
  dm writecache: use 2-factor allocator arguments
  dm thin metadata: remove needless work from __commit_transaction
  dm: use bio_split() when splitting out the already processed bio

Pull single NVMe fix from Christoph.

* 'nvme-4.18' of git://git.infradead.org/nvme:
  nvme-rdma: fix possible double free of controller async event buffer

Fix the test that verifies whether bio_op(bio) represents a discard
or write zeroes operation. Compile-tested only.

Cc: Philipp Reisner <philipp.reisner@linbit.com>
Cc: Lars Ellenberg <lars.ellenberg@linbit.com>
Fixes: 7435e901 ("drbd: zero-out partial unaligned discards on local backend")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Some devices have different queue limits depending on the type of IO. A
classic case is SATA NCQ, where some commands can queue, but others
cannot. If we have NCQ commands inflight and encounter a non-queueable
command, the driver returns busy. Currently we attempt to dispatch more
from the scheduler, if we were able to queue some commands. But for the
case where we ended up stopping due to BUSY, we should not attempt to
retrieve more from the scheduler. If we do, we can get into a situation
where we attempt to queue a non-queueable command, get BUSY, then
successfully retrieve more commands from that scheduler and queue those.
This can repeat forever, starving the non-queuable command indefinitely.

Fix this by NOT attempting to pull more commands from the scheduler, if
we get a BUSY return. This should also be more optimal in terms of
letting requests stay in the scheduler for as long as possible, if we
get a BUSY due to the regular out-of-tags condition.
Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_pgetevents() will not change the signal mask.  Mark it const to make
it clear and to reduce the need for casts in user code.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Avi Kivity <avi@scylladb.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[hch: reapply the patch that got incorrectly reverted]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The big aio poll revert broke various network protocols that don't
implement ->poll as a patch in the aio poll serie removed sock_no_poll
and made the common code handle this case.

Reported-by: syzbot+57727883dbad76db2ef0@syzkaller.appspotmail.com
Reported-by: syzbot+cdb0d3176b53d35ad454@syzkaller.appspotmail.com
Reported-by: syzbot+2c7e8f74f8b2571c87e8@syzkaller.appspotmail.com
Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Fixes: a11e1d43 ("Revert changes to convert to ->poll_mask() and aio IOCB_CMD_POLL")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge fixups for the recent extenstion of the generic power domains
(genpd) framework covering performance states.

* pm-domains:
  PM / Domains: Rename opp_node to np
  PM / Domains: Fix return value of of_genpd_opp_to_performance_state()

It seems that during the conversion from gpio* to gpiod*, the initial
state of SCL was wrongly switched to LOW. Fix it to be HIGH again.

Fixes: 7bb75029 ("i2c: gpio: Enforce open drain through gpiolib")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org

If DMA safe memory was allocated, but the subsequent I2C transfer
fails the memory is leaked. Plug this leak.

Fixes: 8a77821e ("i2c: smbus: use DMA safe buffers for emulated SMBus transactions")
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org

So, if somebody wants to re-implement this in the future, we pinpoint to
a problem case.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

This reverts commit 3e5f06be. As per
bugzilla #200045, this caused a regression. I don't really see a way to
fix it without having the hardware. So, revert the patch and I will fix
the issue I was seeing originally in the i2c-gpio driver itself. I
couldn't find new users of this algorithm since, so there should be no
one depending on the new behaviour.
Reported-by: Sergey Larin <cerg2010cerg2010@mail.ru>
Fixes: 3e5f06be ("i2c: algo-bit: init the bus to a known state")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Sergey Larin <cerg2010cerg2010@mail.ru>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org

If a user is accessing a file in selinuxfs with a pointer to a userspace
buffer that is backed by e.g. a userfaultfd, the userspace access can
stall indefinitely, which can block fsi->mutex if it is held.

For sel_read_policy(), remove the locking, since this method doesn't seem
to access anything that requires locking.

For sel_read_bool(), move the user access below the locked region.

For sel_write_bool() and sel_commit_bools_write(), move the user access
up above the locked region.

Cc: stable@vger.kernel.org
Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: Jann Horn <jannh@google.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
[PM: removed an unused variable in sel_read_policy()]
Signed-off-by: Paul Moore <paul@paul-moore.com>