The fix in the parent made me look at that function, and react to how
illogical and illegible the array initializer was.

Use named array indexes to make it clearer what is going on, and make
the initializer not depend silently on the exact index numbers.

[ The initializer now also shows an odd inconsistency in the naming:
  note the IWCM vs IWPM..   - Linus ]

Cc: Leon Romanovsky <leonro@mellanox.com>
Cc: Doug Ledford <dledford@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The netlink message sent with type == 0, which doesn't have any client
behind it, caused to the overflow in max_num_ops array.

Fix it by declaring zero number of ops for the first client.

Fixes: c9901724 ("RDMA/netlink: Remove netlink clients infrastructure")
Signed-off-by: NLeon Romanovsky <leon@kernel.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Remove our use of 'gperf' for generating perfect hashes from some of our
build tools.

This removal was prompted by Masahiro Yamada sending out a patch that
removes all our pre-generated files, and when I tested it, I noticed
that the gperf version I have (3.1) apparently generates code that no
longer works with out code-base because the function interfaces
generated by gperf have changed.

We really don't care that much, and the gperf people changed their
interfaces in ways that makes it annoying to work with them.  Tools that
make it hard to use them should not be used, and the kernel is not at
all interested in some autoconf mess.  So remove the gperf dependency
entirely.

It turns out that if you ignore the pre-generated files, the use of
gperf apparently saved us a whopping fifteen lines of code.  It
obviously wasn't worth it, considering that the pre-generated files are
about 500 lines.

I sent this out as a patch about three weeks ago, and got absolutely
zero responses.  So let's see if anybody notices now that I merge it.
Because there might be serious bugs here, but it WorksForMe(tm).

* gperf-removal:
  Remove gperf usage from toolchain

Pull SCSI updates from James Bottomley:
 "This is mostly updates of the usual suspects: lpfc, qla2xxx, hisi_sas,
  megaraid_sas, zfcp and a host of minor updates.

  The major driver change here is the elimination of the block based
  cciss driver in favour of the SCSI based hpsa driver (which now drives
  all the legacy cases cciss used to be required for). Plus a reset
  handler clean up and the redo of the SAS SMP handler to use bsg lib"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (279 commits)
  scsi: scsi-mq: Always unprepare before requeuing a request
  scsi: Show .retries and .jiffies_at_alloc in debugfs
  scsi: Improve requeuing behavior
  scsi: Call scsi_initialize_rq() for filesystem requests
  scsi: qla2xxx: Reset the logo flag, after target re-login.
  scsi: qla2xxx: Fix slow mem alloc behind lock
  scsi: qla2xxx: Clear fc4f_nvme flag
  scsi: qla2xxx: add missing includes for qla_isr
  scsi: qla2xxx: Fix an integer overflow in sysfs code
  scsi: aacraid: report -ENOMEM to upper layer from aac_convert_sgraw2()
  scsi: aacraid: get rid of one level of indentation
  scsi: aacraid: fix indentation errors
  scsi: storvsc: fix memory leak on ring buffer busy
  scsi: scsi_transport_sas: switch to bsg-lib for SMP passthrough
  scsi: smartpqi: remove the smp_handler stub
  scsi: hpsa: remove the smp_handler stub
  scsi: bsg-lib: pass the release callback through bsg_setup_queue
  scsi: Rework handling of scsi_device.vpd_pg8[03]
  scsi: Rework the code for caching Vital Product Data (VPD)
  scsi: rcu: Introduce rcu_swap_protected()
  ...

Pull printk updates from Petr Mladek:

 - Do not allow use of freed init data and code even when boot consoles
   are forced to stay. Also check for the init memory more precisely.

 - Some code clean up by starting contributors.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
  printk: Clean up do_syslog() error handling
  printk/console: Enhance the check for consoles using init memory
  printk/console: Always disable boot consoles that use init memory before it is freed
  printk: Modify operators of printed_len and text_len

Pull audit updates from Paul Moore:
 "A small pull request for audit this time, only four patches and only
  two with any real code changes.

  Those two changes are the removal of a pointless SELinux AVC
  initialization audit event and a fix to improve the audit timestamp
  overhead.

  The other two patches are comment cleanup and administrative updates,
  nothing very exciting.

  Everything passes our tests"

* tag 'audit-pr-20170907' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit:
  audit: update the function comments
  selinux: remove AVC init audit log message
  audit: update the audit info in MAINTAINERS
  audit: Reduce overhead using a coarse clock

Pull secureexec update from Kees Cook:
 "This series has the ultimate goal of providing a sane stack rlimit
  when running set*id processes.

  To do this, the bprm_secureexec LSM hook is collapsed into the
  bprm_set_creds hook so the secureexec-ness of an exec can be
  determined early enough to make decisions about rlimits and the
  resulting memory layouts. Other logic acting on the secureexec-ness of
  an exec is similarly consolidated. Capabilities needed some special
  handling, but the refactoring removed other special handling, so that
  was a wash"

* tag 'secureexec-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  exec: Consolidate pdeath_signal clearing
  exec: Use sane stack rlimit under secureexec
  exec: Consolidate dumpability logic
  smack: Remove redundant pdeath_signal clearing
  exec: Use secureexec for clearing pdeath_signal
  exec: Use secureexec for setting dumpability
  LSM: drop bprm_secureexec hook
  commoncap: Move cap_elevated calculation into bprm_set_creds
  commoncap: Refactor to remove bprm_secureexec hook
  smack: Refactor to remove bprm_secureexec hook
  selinux: Refactor to remove bprm_secureexec hook
  apparmor: Refactor to remove bprm_secureexec hook
  binfmt: Introduce secureexec flag
  exec: Correct comments about "point of no return"
  exec: Rename bprm->cred_prepared to called_set_creds

Pull gcc plugins update from Kees Cook:
 "This finishes the porting work on randstruct, and introduces a new
  option to structleak, both noted below:

   - For the randstruct plugin, enable automatic randomization of
     structures that are entirely function pointers (along with a couple
     designated initializer fixes).

   - For the structleak plugin, provide an option to perform zeroing
     initialization of all otherwise uninitialized stack variables that
     are passed by reference (Ard Biesheuvel)"

* tag 'gcc-plugins-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  gcc-plugins: structleak: add option to init all vars used as byref args
  randstruct: Enable function pointer struct detection
  drivers/net/wan/z85230.c: Use designated initializers
  drm/amd/powerplay: rv: Use designated initializers

Pull pstore update from Kees Cook:
 "Make pstore permissions more versatile by removing CAP_SYSLOG
  requirement and defining more restrictive root directory DAC
  permissions default (0750, which can be adjust after boot unlike the
  CAP_SYSLOG check).

  Suggested by Nick Kralevich"

* tag 'pstore-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  Revert "pstore: Honor dmesg_restrict sysctl on dmesg dumps"
  pstore: Make default pstorefs root dir perms 0750

Pull cifs update from Steve French:
 "Enable xattr support for smb3 and also a bugfix"

* tag '4.14-smb3-xattr-enable' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Check for timeout on Negotiate stage
  cifs: Add support for writing attributes on SMB2+
  cifs: Add support for reading attributes on SMB2+

Pull aio fix from Ben LaHaise:
 "Improve aio-nr counting on large SMP systems.

  It has been in linux-next for quite some time"

* git://git.kvack.org/~bcrl/aio-next:
  fs: aio: fix the increment of aio-nr and counting against aio-max-nr

Pull quota scaling updates from Jan Kara:
 "This contains changes to make the quota subsystem more scalable.

  Reportedly it improves number of files created per second on ext4
  filesystem on fast storage by about a factor of 2x"

* 'quota_scaling' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: (28 commits)
  quota: Add lock annotations to struct members
  quota: Reduce contention on dq_data_lock
  fs: Provide __inode_get_bytes()
  quota: Inline dquot_[re]claim_reserved_space() into callsite
  quota: Inline inode_{incr,decr}_space() into callsites
  quota: Inline functions into their callsites
  ext4: Disable dirty list tracking of dquots when journalling quotas
  quota: Allow disabling tracking of dirty dquots in a list
  quota: Remove dq_wait_unused from dquot
  quota: Move locking into clear_dquot_dirty()
  quota: Do not dirty bad dquots
  quota: Fix possible corruption of dqi_flags
  quota: Propagate ->quota_read errors from v2_read_file_info()
  quota: Fix error codes in v2_read_file_info()
  quota: Push dqio_sem down to ->read_file_info()
  quota: Push dqio_sem down to ->write_file_info()
  quota: Push dqio_sem down to ->get_next_id()
  quota: Push dqio_sem down to ->release_dqblk()
  quota: Remove locking for writing to the old quota format
  quota: Do not acquire dqio_sem for dquot overwrites in v2 format
  ...

Pull UDF, reiserfs, quota, fsnotify cleanups from Jan Kara:
 "Several UDF, reiserfs, quota and fsnotify cleanups.

  Note that there is also a patch updating MAINTAINERS entry for
  notification subsystem to point to me as a maintainer since current
  entries are stale"

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  fsnotify: make dnotify_fsnotify_ops const
  isofs: Delete an unnecessary variable initialisation in isofs_read_inode()
  isofs: Adjust four checks for null pointers
  isofs: Delete an error message for a failed memory allocation in isofs_read_inode()
  quota_v2: Delete an error message for a failed memory allocation in v2_read_file_info()
  fs-udf: Delete an error message for a failed memory allocation in two functions
  fs-udf: Improve six size determinations
  fs-udf: Adjust two checks for null pointers
  reiserfs: fix spelling mistake: "tranasction" -> "transaction"
  MAINTAINERS: Update entries for notification subsystem
  uapi/linux/quota.h: Do not include linux/errno.h

Pull DeviceTree updates from Rob Herring:
 "There's a few orphans in the conversion to %pOF printf specifiers
  included here that no one else picked up.

  Summary:

   - Convert more DT code to use of_property_read_* API.

   - Improve DT overlay support when adding multiple overlays

   - Convert printk's to %pOF format specifiers. Most went via subsystem
     trees, but picked up the remaining orphans

   - Correct unittests to use preferred "okay" for "status" property
     value

   - Add a KASLR seed property

   - Vendor prefixes for Mellanox, Theobroma System, Adaptrum, Moxa

   - Fix modalias buffer handling

   - Clean-up of include paths for building dtbs

   - Add bindings for amc6821, isl1208, tsl2x7x, srf02, and srf10
     devices

   - Add nvmem bindings for MediaTek MT7623 and MT7622 SoC

   - Add compatible string for Allwinner H5 Mali-450 GPU

   - Fix links to old OpenFirmware docs with new mirror on
     devicetree.org

   - Remove status property from binding doc examples"

* tag 'devicetree-for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (45 commits)
  devicetree: Adjust status "ok" -> "okay" under drivers/of/
  dt-bindings: Remove "status" from examples
  dt-bindings: pinctrl: sh-pfc: Use generic node name
  dt-bindings: Add vendor Mellanox
  dt-binding: net/phy: fix interrupts description
  virt: Convert to using %pOF instead of full_name
  macintosh: Convert to using %pOF instead of full_name
  ide: pmac: Convert to using %pOF instead of full_name
  microblaze: Convert to using %pOF instead of full_name
  dt-bindings: usb: musb: Grammar s/the/to/, s/is/are/
  of: Use PLATFORM_DEVID_NONE definition
  of/device: Fix of_device_get_modalias() buffer handling
  of/device: Prevent buffer overflow in of_device_modalias()
  dt-bindings: add amc6821, isl1208 trivial bindings
  dt-bindings: add vendor prefix for Theobroma Systems
  of: search scripts/dtc/include-prefixes path for both CPP and DTC
  of: remove arch/$(SRCARCH)/boot/dts from include search path for CPP
  of: remove drivers/of/testcase-data from include search path for CPP
  of: return of_get_cpu_node from of_cpu_device_node_get if CPUs are not registered
  iio: srf08: add device tree binding for srf02 and srf10
  ...

Pull i916 drm fixes from Rodrigo Vivi:
 "Since Dave is on paternity leave we are sending drm/i915 fixes for
  v4.14-rc1 directly to you as he had asked us to do.

  The most critical ones are the GPU reset fix for gen2-4 and GVT fix
  for a regression that is blocking gvt init to work on your tree.

  The rest is general fixes for patches coming from drm-next"
Acked-by: NDave Airlie <airlied@redhat.com>

* tag 'drm-intel-next-fixes-2017-09-07' of git://anongit.freedesktop.org/git/drm-intel:
  drm/i915: Re-enable GTT following a device reset
  drm/i915: Annotate user relocs with __user
  drm/i915: Silence sparse by using gfp_t
  drm/i915: Add __rcu to radix tree slot pointer
  drm/i915: Fix the missing PPAT cache attributes on CNL
  drm/i915/gvt: Remove one duplicated MMIO
  drm/i915: Fix enum pipe vs. enum transcoder for the PCH transcoder
  drm/i915: Make i2c lock ops static
  drm/i915: Make i9xx_load_ycbcr_conversion_matrix() static
  drm/i915/edp: Increase T12 panel delay to 900 ms to fix DP AUX CH timeouts
  drm/i915: Ignore duplicate VMA stored within the per-object handle LUT
  drm/i915: Skip fence alignemnt check for the CCS plane
  drm/i915: Treat fb->offsets[] as a raw byte offset instead of a linear offset
  drm/i915: Always wake the device to flush the GTT
  drm/i915: Recreate vmapping even when the object is pinned
  drm/i915: Quietly cancel FBC activation if CRTC is turned off before worker

Pull LED updates from Jacek Anaszewski:
 "LED class drivers improvements:

  leds-pca955x:
   - add Device Tree support and bindings
   - use devm_led_classdev_register()
   - add GPIO support
   - prevent crippled LED class device name
   - check for I2C errors

  leds-gpio:
   - add optional retain-state-shutdown DT property
   - allow LED to retain state at shutdown

  leds-tlc591xx:
   - merge conditional tests
   - add missing of_node_put

  leds-powernv:
   - delete an error message for a failed memory allocation in
     powernv_led_create()

  leds-is31fl32xx.c
   - convert to using custom %pOF printf format specifier

  Constify attribute_group structures in:
   - leds-blinkm
   - leds-lm3533

  Make several arrays static const in:
   - leds-aat1290
   - leds-lp5521
   - leds-lp5562
   - leds-lp8501"

* tag 'leds_for_4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
  leds: pca955x: check for I2C errors
  leds: gpio: Allow LED to retain state at shutdown
  dt-bindings: leds: gpio: Add optional retain-state-shutdown property
  leds: powernv: Delete an error message for a failed memory allocation in powernv_led_create()
  leds: lp8501: make several arrays static const
  leds: lp5562: make several arrays static const
  leds: lp5521: make several arrays static const
  leds: aat1290: make array max_mm_current_percent static const
  leds: pca955x: Prevent crippled LED device name
  leds: lm3533: constify attribute_group structure
  dt-bindings: leds: add pca955x
  leds: pca955x: add GPIO support
  leds: pca955x: use devm_led_classdev_register
  leds: pca955x: add device tree support
  leds: Convert to using %pOF instead of full_name
  leds: blinkm: constify attribute_group structures.
  leds: tlc591xx: add missing of_node_put
  leds: tlc591xx: merge conditional tests

Pull dmaengine updates from Vinod Koul:
 "This one features the usual updates to the drivers and one good part
  of removing DA_SG from core as it has no users.

  Summary:

   - Remove DMA_SG support as we have no users for this feature
   - New driver for Altera / Intel mSGDMA IP core
   - Support for memset in dmatest and qcom_hidma driver
   - Update for non cyclic mode in k3dma, bunch of update in bam_dma,
     bcm sba-raid
   - Constify device ids across drivers"

* tag 'dmaengine-4.14-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (52 commits)
  dmaengine: sun6i: support V3s SoC variant
  dmaengine: sun6i: make gate bit in sun8i's DMA engines a common quirk
  dmaengine: rcar-dmac: document R8A77970 bindings
  dmaengine: xilinx_dma: Fix error code format specifier
  dmaengine: altera: Use macros instead of structs to describe the registers
  dmaengine: ti-dma-crossbar: Fix dra7 reserve function
  dmaengine: pl330: constify amba_id
  dmaengine: pl08x: constify amba_id
  dmaengine: bcm-sba-raid: Remove redundant SBA_REQUEST_STATE_COMPLETED
  dmaengine: bcm-sba-raid: Explicitly ACK mailbox message after sending
  dmaengine: bcm-sba-raid: Add debugfs support
  dmaengine: bcm-sba-raid: Remove redundant SBA_REQUEST_STATE_RECEIVED
  dmaengine: bcm-sba-raid: Re-factor sba_process_deferred_requests()
  dmaengine: bcm-sba-raid: Pre-ack async tx descriptor
  dmaengine: bcm-sba-raid: Peek mbox when we have no free requests
  dmaengine: bcm-sba-raid: Alloc resources before registering DMA device
  dmaengine: bcm-sba-raid: Improve sba_issue_pending() run duration
  dmaengine: bcm-sba-raid: Increase number of free sba_request
  dmaengine: bcm-sba-raid: Allow arbitrary number free sba_request
  dmaengine: bcm-sba-raid: Remove reqs_free_count from sba_device
  ...

Pull backlight updates from Lee Jones:
 "Fix-ups:
   - Constification; pwm_bl
   - Use new GPIO API; gpio_backlight
   - Remove unused functionality; gpio_backlight

  Bug Fixes:
   - Fix artificial MAXREG limit; lm3630a_bl"

* tag 'backlight-next-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
  backlight: gpio_backlight: Delete pdata inversion
  backlight: gpio_backlight: Convert to use GPIO descriptor
  backlight: pwm_bl: Make of_device_ids const
  backlight: lm3630a: Bump REG_MAX value to 0x50 instead of 0x1F

Pull MFD updates from Lee Jones:
 "New Drivers
   - RK805 Power Management IC (PMIC)
   - ROHM BD9571MWV-M MFD Power Management IC (PMIC)
   - Texas Instruments TPS68470 Power Management IC (PMIC) & LEDs

  New Device Support:
   - Add support for HiSilicon Hi6421v530 to hi6421-pmic-core
   - Add support for X-Powers AXP806 to axp20x
   - Add support for X-Powers AXP813 to axp20x
   - Add support for Intel Sunrise Point LPSS to intel-lpss-pci

  New Functionality:
   - Amend API to provide register layout; atmel-smc

  Fix-ups:
   - DT re-work; omap, nokia
   - Header file location change {I2C => MFD}; dm355evm_msp, tps65010
   - Fix chip ID formatting issue(s); rk808
   - Optionally register touchscreen devices; da9052-core
   - Documentation improvements; twl-core
   - Constification; rtsx_pcr, ab8500-core, da9055-i2c, da9052-spi
   - Drop unnecessary static declaration; max8925-i2c
   - Kconfig changes (missing deps and remove module support)
   - Slim down oversized licence statement; hi6421-pmic-core
   - Use managed resources (devm_*); lp87565
   - Supply proper error checking/handling; t7l66xb

  Bug Fixes:
   - Fix counter duplication issue; da9052-core
   - Fix potential NULL deference issue; max8998
   - Leave SPI-NOR write-protection bit alone; lpc_ich
   - Ensure device is put into reset during suspend; intel-lpss
   - Correct register offset variable size; omap-usb-tll"

* tag 'mfd-next-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (61 commits)
  mfd: intel_soc_pmic: Differentiate between Bay and Cherry Trail CRC variants
  mfd: intel_soc_pmic: Export separate mfd-cell configs for BYT and CHT
  dt-bindings: mfd: Add bindings for ZII RAVE devices
  mfd: omap-usb-tll: Fix register offsets
  mfd: da9052: Constify spi_device_id
  mfd: intel-lpss: Put I2C and SPI controllers into reset state on suspend
  mfd: da9055: Constify i2c_device_id
  mfd: intel-lpss: Add missing PCI ID for Intel Sunrise Point LPSS devices
  mfd: t7l66xb: Handle return value of clk_prepare_enable
  mfd: Add ROHM BD9571MWV-M PMIC DT bindings
  mfd: intel_soc_pmic_chtwc: Turn Kconfig option into a bool
  mfd: lp87565: Convert to use devm_mfd_add_devices()
  mfd: Add support for TPS68470 device
  mfd: lpc_ich: Do not touch SPI-NOR write protection bit on Haswell/Broadwell
  mfd: syscon: atmel-smc: Add helper to retrieve register layout
  mfd: axp20x: Use correct platform device ID for many PEK
  dt-bindings: mfd: axp20x: Introduce bindings for AXP813
  mfd: axp20x: Add support for AXP813 PMIC
  dt-bindings: mfd: axp20x: Add AXP806 to supported list of chips
  mfd: Add ROHM BD9571MWV-M MFD PMIC driver
  ...

Pull input updates from Dmitry Torokhov:

 - a new GPIO bit-banging driver implementing PS/2 protocol

 - a new power key driver for Rockchip RK805 PMIC

 - bunch of patches constifying various device ID structures

 - Elan I2C touchpad driver now supports devices with 2 buttons

 - other assorted fixes

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (76 commits)
  Input: byd - make array seq static, reduces object code size
  Input: xilinx_ps2 - fix multiline comment style
  Input: pxa27x_keypad - handle return value of clk_prepare_enable
  Input: tegra-kbc - handle return value of clk_prepare_enable
  Input: PS/2 gpio bit banging driver for serio bus
  Input: xen-kbdfront - enable auto repeat for xen keyboard frontend driver
  Input: ambakmi - constify amba_id
  Input: atmel_mxt_ts - add support for reset line
  Input: atmel_mxt_ts - use more managed resources
  Input: wacom_w8001 - constify serio_device_id
  Input: tsc40 - constify serio_device_id
  Input: touchwin - constify serio_device_id
  Input: touchright - constify serio_device_id
  Input: touchit213 - constify serio_device_id
  Input: penmount - constify serio_device_id
  Input: mtouch - constify serio_device_id
  Input: inexio - constify serio_device_id
  Input: hampshire - constify serio_device_id
  Input: gunze - constify serio_device_id
  Input: fujitsu_ts - constify serio_device_id
  ...

Pull mailbox updates from Jassi Brar:
 "Just behavorial changes to a controller driver: the Broadcom's Flexrm
  mailbox driver has been modifified to support debugfs and TX-Done
  mechanism by ACK.

  Nothing for the core mailbox stack"

* tag 'mailbox-v4.14' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  mailbox: bcm-flexrm-mailbox: Use txdone_ack instead of txdone_poll
  mailbox: bcm-flexrm-mailbox: Use bitmap instead of IDA
  mailbox: bcm-flexrm-mailbox: Fix mask used in CMPL_START_ADDR_VALUE()
  mailbox: bcm-flexrm-mailbox: Add debugfs support
  mailbox: bcm-flexrm-mailbox: Set IRQ affinity hint for FlexRM ring IRQs

Pull media updates from Mauro Carvalho Chehab:
 "Brazil's Independence Day pull request :-)

  This is one of the biggest media pull requests, with 625 patches
  affecting almost all parts of media (RC, DVB, V4L2, CEC, docs).

  This contains:

   - A lot of new drivers:
     * DVB frontends: mxl5xx, stv0910, stv6111;
     * camera flash: as3645a led driver;
     * HDMI receiver: adv748X;
     * camera sensor: Omnivision 6650 5M driver (ov6650);
     * HDMI CEC: ao-cec meson driver;
     * V4L2: Qualcom camss driver;
     * Remote controller: gpio-ir-tx, pwm-ir-tx and zx-irdec drivers.

   - The DDbridge DVB driver got a massive update, with makes it in sync
     with modern hardware from that vendor;

   - There's an important milestone on this series: the DVB
     documentation was written in 2003, but only started to be updated
     in 2007. It also used to contain several gaps from the time it was
     kept out of tree, mentioning error codes and device nodes that
     never existed upstream. On this series, it received a massive
     update: all non-deprecated digital TV APIs are now in sync with the
     current implementation;

   - Some DVB APIs that aren't used by any upstream driver got removed;

   - Other parts of the media documentation algo got updated, fixing
     some bugs on its PDF output and making it compatible with Sphinx
     version 1.6.

     As the number of hacks required to build PDF output reduced, I hope
     we'll have less troubles as newer versions of our documentation
     toolchain are released (famous last words);

   - As usual, lots of driver cleanups and improvements"

* tag 'media/v4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (624 commits)
  media: leds: as3645a: add V4L2_FLASH_LED_CLASS dependency
  media: get rid of removed DMX_GET_CAPS and DMX_SET_SOURCE leftovers
  media: Revert "[media] v4l: async: make v4l2 coexist with devicetree nodes in a dt overlay"
  media: staging: atomisp: sh_css_calloc shall return a pointer to the allocated space
  media: Revert "[media] lirc_dev: remove superfluous get/put_device() calls"
  media: add qcom_camss.rst to v4l-drivers rst file
  media: dvb headers: make checkpatch happier
  media: dvb uapi: move frontend legacy API to another part of the book
  media: pixfmt-srggb12p.rst: better format the table for PDF output
  media: docs-rst: media: Don't use \small for V4L2_PIX_FMT_SRGGB10 documentation
  media: index.rst: don't write "Contents:" on PDF output
  media: pixfmt*.rst: replace a two dots by a comma
  media: vidioc-g-fmt.rst: adjust table format
  media: vivid.rst: add a blank line to correct ReST format
  media: v4l2 uapi book: get rid of driver programming's chapter
  media: format.rst: use the right markup for important notes
  media: docs-rst: cardlists: change their format to flat-tables
  media: em28xx-cardlist.rst: update to reflect last changes
  media: v4l2-event.rst: adjust table to fit on PDF output
  media: docs: don't show ToC for each part on PDF output
  ...

Pull sound updates from Takashi Iwai:
 "We have touched quite a lot of files but with fewer changes at this
  cycle; as you can see, most of changes are trivial fixes, especially
  constification patches.

  Among the massive attacks by constification gangs, we had a few core
  changes (mostly for ASoC core), as well the fixes and the updates by
  major vendors.

  Some highlights:

  ALSA core:

   - Fix possible races in control API user-TLV codes

   - Small cleanup of PCM core

  ASoC:

   - Continued work for componentization; still half-baked, but we're
     certainly progressing

   - Use of devres for jack detection GPIOs, rather as a cleanup

   - Jack detection support for Qualcomm MSM8916

   - Support for Allwinner H3, Cirrus Logic CS43130, Intel Kabylake
     systems with RT5663, Realtek RT274, TI TLV320AIC32x6 and Wolfson
     WM8523"

* tag 'sound-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (512 commits)
  ALSA: hda/ca0132 - Fix memory leak at error path
  ALSA: hda: Fix forget to free resource in error handling code path in hda_codec_driver_probe
  ASoC: cs43130: Fix unused compiler warnings for PM runtime
  ASoC: cs43130: Fix possible Oops with invalid dev_id
  ASoC: cs43130: fix spelling mistake: "irq_occurrance" -> "irq_occurrence"
  ALSA: atmel: Remove leftovers of AVR32 removal
  ALSA: atmel: convert AC97c driver to GPIO descriptor API
  ALSA: hda/realtek - Enable jack detection function for Intel ALC700
  ALSA: hda: Fix regression of hdmi eld control created based on invalid pcm
  ASoC: Intel: Skylake: Add IPC to configure the copier secondary pins
  ASoC: add missing compile rule for max98371
  ASoC: add missing compile rule for sirf-audio-codec
  ASoC: add missing compile rule for max98371
  ASoC: cs43130: Add devicetree bindings for CS43130
  ASoC: cs43130: Add support for CS43130 codec
  ASoC: make clock direction configurable in asoc-simple
  ALSA: ctxfi: Remove null check before kfree
  ASoC: max98927: Changed device property read function
  ASoC: max98927: Modified DAPM widget and map to enable/disable VI sense path
  ASoC: max98927: Added PM suspend and resume function
  ...

Pull MD updates from Shaohua Li:
 "This update mainly fixes bugs:

   - Make raid5 ppl support several ppl from Pawel

   - Several raid5-cache bug fixes from Song

   - Bitmap fixes from Neil and Me

   - One raid1/10 regression fix since 4.12 from Me

   - Other small fixes and cleanup"

* tag 'md/4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md:
  md/bitmap: disable bitmap_resize for file-backed bitmaps.
  raid5-ppl: Recovery support for multiple partial parity logs
  md: Runtime support for multiple ppls
  md/raid0: attach correct cgroup info in bio
  lib/raid6: align AVX512 constants to 512 bits, not bytes
  raid5: remove raid5_build_block
  md/r5cache: call mddev_lock/unlock() in r5c_journal_mode_show
  md: replace seq_release_private with seq_release
  md: notify about new spare disk in the container
  md/raid1/10: reset bio allocated from mempool
  md/raid5: release/flush io in raid5_do_work()
  md/bitmap: copy correct data for bitmap super

Pull MMC updates from Ulf Hansson:
 "MMC core:
   - Continue to refactor the mmc block code to prepare for blkmq
   - Move mmc block debugfs into block module
   - Next step for eMMC CMDQ by adding a new mmc host interface for it
   - Move Kconfig option MMC_DEBUG from core to host
   - Some additional minor improvements

  MMC host:
   - Declare structs as const when applicable
   - Explicitly request exclusive reset control when applicable
   - Improve some error paths and other various cleanups
   - sdhci: Preparations to support SDHCI OMAP
   - sdhci: Improve some PM related code
   - sdhci: Re-factoring and modernizations
   - sdhci-xenon: Add runtime PM and system sleep support
   - sdhci-xenon: Add support for eMMC HS400 Enhanced Strobe
   - sdhci-cadence: Add system sleep support
   - sdhci-of-at91: Improve system sleep support
   - dw_mmc: Add support for Hisilicon hi3660
   - sunxi: Add support for A83T eMMC
   - sunxi: Add support for DDR52 mode
   - meson-gx: Add support for UHS-I SD-cards
   - meson-gx: Cleanups and improvements
   - tmio: Fix CMD12 (STOP) handling
   - tmio: Cleanups and improvements
   - renesas_sdhi: Add r8a7743/5 support
   - renesas-sdhi: Add support for R-Car Gen3 SDHI DMAC
   - renesas_sdhi: Cleanups and improvements"

* tag 'mmc-v4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: (145 commits)
  mmc: renesas_sdhi: Add r8a7743/5 support
  mmc: meson-gx: fix __ffsdi2 undefined on arm32
  mmc: sdhci-xenon: add runtime pm support and reimplement standby
  mmc: core: Move mmc_start_areq() declaration
  mmc: mmci: stop building qcom dml as module
  mmc: sunxi: Reset the device at probe time
  clk: sunxi-ng: Provide a default reset hook
  mmc: meson-gx: rework tuning function
  mmc: meson-gx: change default tx phase
  mmc: meson-gx: implement voltage switch callback
  mmc: meson-gx: use CCF to handle the clock phases
  mmc: meson-gx: implement card_busy callback
  mmc: meson-gx: simplify interrupt handler
  mmc: meson-gx: work around clk-stop issue
  mmc: meson-gx: fix dual data rate mode frequencies
  mmc: meson-gx: rework clock init function
  mmc: meson-gx: rework clk_set function
  mmc: meson-gx: rework set_ios function
  mmc: meson-gx: cfg init overwrite values
  mmc: meson-gx: initialize sane clk default before clock register
  ...

Pull block layer updates from Jens Axboe:
 "This is the first pull request for 4.14, containing most of the code
  changes. It's a quiet series this round, which I think we needed after
  the churn of the last few series. This contains:

   - Fix for a registration race in loop, from Anton Volkov.

   - Overflow complaint fix from Arnd for DAC960.

   - Series of drbd changes from the usual suspects.

   - Conversion of the stec/skd driver to blk-mq. From Bart.

   - A few BFQ improvements/fixes from Paolo.

   - CFQ improvement from Ritesh, allowing idling for group idle.

   - A few fixes found by Dan's smatch, courtesy of Dan.

   - A warning fixup for a race between changing the IO scheduler and
     device remova. From David Jeffery.

   - A few nbd fixes from Josef.

   - Support for cgroup info in blktrace, from Shaohua.

   - Also from Shaohua, new features in the null_blk driver to allow it
     to actually hold data, among other things.

   - Various corner cases and error handling fixes from Weiping Zhang.

   - Improvements to the IO stats tracking for blk-mq from me. Can
     drastically improve performance for fast devices and/or big
     machines.

   - Series from Christoph removing bi_bdev as being needed for IO
     submission, in preparation for nvme multipathing code.

   - Series from Bart, including various cleanups and fixes for switch
     fall through case complaints"

* 'for-4.14/block' of git://git.kernel.dk/linux-block: (162 commits)
  kernfs: checking for IS_ERR() instead of NULL
  drbd: remove BIOSET_NEED_RESCUER flag from drbd_{md_,}io_bio_set
  drbd: Fix allyesconfig build, fix recent commit
  drbd: switch from kmalloc() to kmalloc_array()
  drbd: abort drbd_start_resync if there is no connection
  drbd: move global variables to drbd namespace and make some static
  drbd: rename "usermode_helper" to "drbd_usermode_helper"
  drbd: fix race between handshake and admin disconnect/down
  drbd: fix potential deadlock when trying to detach during handshake
  drbd: A single dot should be put into a sequence.
  drbd: fix rmmod cleanup, remove _all_ debugfs entries
  drbd: Use setup_timer() instead of init_timer() to simplify the code.
  drbd: fix potential get_ldev/put_ldev refcount imbalance during attach
  drbd: new disk-option disable-write-same
  drbd: Fix resource role for newly created resources in events2
  drbd: mark symbols static where possible
  drbd: Send P_NEG_ACK upon write error in protocol != C
  drbd: add explicit plugging when submitting batches
  drbd: change list_for_each_safe to while(list_first_entry_or_null)
  drbd: introduce drbd_recv_header_maybe_unplug
  ...

Pull xen updates from Juergen Gross:

 - the new pvcalls backend for routing socket calls from a guest to dom0

 - some cleanups of Xen code

 - a fix for wrong usage of {get,put}_cpu()

* tag 'for-linus-4.14b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (27 commits)
  xen/mmu: set MMU_NORMAL_PT_UPDATE in remap_area_mfn_pte_fn
  xen: Don't try to call xen_alloc_p2m_entry() on autotranslating guests
  xen/events: events_fifo: Don't use {get,put}_cpu() in xen_evtchn_fifo_init()
  xen/pvcalls: use WARN_ON(1) instead of __WARN()
  xen: remove not used trace functions
  xen: remove unused function xen_set_domain_pte()
  xen: remove tests for pvh mode in pure pv paths
  xen-platform: constify pci_device_id.
  xen: cleanup xen.h
  xen: introduce a Kconfig option to enable the pvcalls backend
  xen/pvcalls: implement write
  xen/pvcalls: implement read
  xen/pvcalls: implement the ioworker functions
  xen/pvcalls: disconnect and module_exit
  xen/pvcalls: implement release command
  xen/pvcalls: implement poll command
  xen/pvcalls: implement accept command
  xen/pvcalls: implement listen command
  xen/pvcalls: implement bind command
  xen/pvcalls: implement connect command
  ...

Pull powerpc updates from Michael Ellerman:
 "Nothing really major this release, despite quite a lot of activity.
  Just lots of things all over the place.

  Some things of note include:

   - Access via perf to a new type of PMU (IMC) on Power9, which can
     count both core events as well as nest unit events (Memory
     controller etc).

   - Optimisations to the radix MMU TLB flushing, mostly to avoid
     unnecessary Page Walk Cache (PWC) flushes when the structure of the
     tree is not changing.

   - Reworks/cleanups of do_page_fault() to modernise it and bring it
     closer to other architectures where possible.

   - Rework of our page table walking so that THP updates only need to
     send IPIs to CPUs where the affected mm has run, rather than all
     CPUs.

   - The size of our vmalloc area is increased to 56T on 64-bit hash MMU
     systems. This avoids problems with the percpu allocator on systems
     with very sparse NUMA layouts.

   - STRICT_KERNEL_RWX support on PPC32.

   - A new sched domain topology for Power9, to capture the fact that
     pairs of cores may share an L2 cache.

   - Power9 support for VAS, which is a new mechanism for accessing
     coprocessors, and initial support for using it with the NX
     compression accelerator.

   - Major work on the instruction emulation support, adding support for
     many new instructions, and reworking it so it can be used to
     implement the emulation needed to fixup alignment faults.

   - Support for guests under PowerVM to use the Power9 XIVE interrupt
     controller.

  And probably that many things again that are almost as interesting,
  but I had to keep the list short. Plus the usual fixes and cleanups as
  always.

  Thanks to: Alexey Kardashevskiy, Alistair Popple, Andreas Schwab,
  Aneesh Kumar K.V, Anju T Sudhakar, Arvind Yadav, Balbir Singh,
  Benjamin Herrenschmidt, Bhumika Goyal, Breno Leitao, Bryant G. Ly,
  Christophe Leroy, Cédric Le Goater, Dan Carpenter, Dou Liyang,
  Frederic Barrat, Gautham R. Shenoy, Geliang Tang, Geoff Levand, Hannes
  Reinecke, Haren Myneni, Ivan Mikhaylov, John Allen, Julia Lawall,
  LABBE Corentin, Laurentiu Tudor, Madhavan Srinivasan, Markus Elfring,
  Masahiro Yamada, Matt Brown, Michael Neuling, Murilo Opsfelder Araujo,
  Nathan Fontenot, Naveen N. Rao, Nicholas Piggin, Oliver O'Halloran,
  Paul Mackerras, Rashmica Gupta, Rob Herring, Rui Teng, Sam Bobroff,
  Santosh Sivaraj, Scott Wood, Shilpasri G Bhat, Sukadev Bhattiprolu,
  Suraj Jitindar Singh, Tobin C. Harding, Victor Aoqui"

* tag 'powerpc-4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (321 commits)
  powerpc/xive: Fix section __init warning
  powerpc: Fix kernel crash in emulation of vector loads and stores
  powerpc/xive: improve debugging macros
  powerpc/xive: add XIVE Exploitation Mode to CAS
  powerpc/xive: introduce H_INT_ESB hcall
  powerpc/xive: add the HW IRQ number under xive_irq_data
  powerpc/xive: introduce xive_esb_write()
  powerpc/xive: rename xive_poke_esb() in xive_esb_read()
  powerpc/xive: guest exploitation of the XIVE interrupt controller
  powerpc/xive: introduce a common routine xive_queue_page_alloc()
  powerpc/sstep: Avoid used uninitialized error
  axonram: Return directly after a failed kzalloc() in axon_ram_probe()
  axonram: Improve a size determination in axon_ram_probe()
  axonram: Delete an error message for a failed memory allocation in axon_ram_probe()
  powerpc/powernv/npu: Move tlb flush before launching ATSD
  powerpc/macintosh: constify wf_sensor_ops structures
  powerpc/iommu: Use permission-specific DEVICE_ATTR variants
  powerpc/eeh: Delete an error out of memory message at init time
  powerpc/mm: Use seq_putc() in two functions
  macintosh: Convert to using %pOF instead of full_name
  ...

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

   - Transparently fall back to other poweroff method(s) if EFI poweroff
     fails (and returns)

   - Use separate PE/COFF section headers for the RX and RW parts of the
     ARM stub loader so that the firmware can use strict mapping
     permissions

   - Add support for requesting the firmware to wipe RAM at warm reboot

   - Increase the size of the random seed obtained from UEFI so CRNG
     fast init can complete earlier

   - Update the EFI framebuffer address if it points to a BAR that gets
     moved by the PCI resource allocation code

   - Enable "reset attack mitigation" of TPM environments: this is
     enabled if the kernel is configured with
     CONFIG_RESET_ATTACK_MITIGATION=y.

   - Clang related fixes

   - Misc cleanups, constification, refactoring, etc"

* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi/bgrt: Use efi_mem_type()
  efi: Move efi_mem_type() to common code
  efi/reboot: Make function pointer orig_pm_power_off static
  efi/random: Increase size of firmware supplied randomness
  efi/libstub: Enable reset attack mitigation
  firmware/efi/esrt: Constify attribute_group structures
  firmware/efi: Constify attribute_group structures
  firmware/dcdbas: Constify attribute_group structures
  arm/efi: Split zImage code and data into separate PE/COFF sections
  arm/efi: Replace open coded constants with symbolic ones
  arm/efi: Remove pointless dummy .reloc section
  arm/efi: Remove forbidden values from the PE/COFF header
  drivers/fbdev/efifb: Allow BAR to be moved instead of claiming it
  efi/reboot: Fall back to original power-off method if EFI_RESET_SHUTDOWN returns
  efi/arm/arm64: Add missing assignment of efi.config_table
  efi/libstub/arm64: Set -fpie when building the EFI stub
  efi/libstub/arm64: Force 'hidden' visibility for section markers
  efi/libstub/arm64: Use hidden attribute for struct screen_info reference
  efi/arm: Don't mark ACPI reclaim memory as MEMBLOCK_NOMAP

Currently, aio-nr is incremented in steps of 'num_possible_cpus() * 8'
for io_setup(nr_events, ..) with 'nr_events < num_possible_cpus() * 4':

    ioctx_alloc()
    ...
        nr_events = max(nr_events, num_possible_cpus() * 4);
        nr_events *= 2;
    ...
        ctx->max_reqs = nr_events;
    ...
        aio_nr += ctx->max_reqs;
    ....

This limits the number of aio contexts actually available to much less
than aio-max-nr, and is increasingly worse with greater number of CPUs.

For example, with 64 CPUs, only 256 aio contexts are actually available
(with aio-max-nr = 65536) because the increment is 512 in that scenario.

Note: 65536 [max aio contexts] / (64*4*2) [increment per aio context]
is 128, but make it 256 (double) as counting against 'aio-max-nr * 2':

    ioctx_alloc()
    ...
        if (aio_nr + nr_events > (aio_max_nr * 2UL) ||
        ...
            goto err_ctx;
    ...

This patch uses the original value of nr_events (from userspace) to
increment aio-nr and count against aio-max-nr, which resolves those.
Signed-off-by: NMauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
Reported-by: NLekshmi C. Pillai <lekshmi.cpillai@in.ibm.com>
Tested-by: NLekshmi C. Pillai <lekshmi.cpillai@in.ibm.com>
Tested-by: NPaul Nguyen <nguyenp@us.ibm.com>
Reviewed-by: NJeff Moyer <jmoyer@redhat.com>
Signed-off-by: NBenjamin LaHaise <bcrl@kvack.org>

Pull x86 platform updates from Ingo Molnar:
 "The main changes include various Hyper-V optimizations such as faster
  hypercalls and faster/better TLB flushes - and there's also some
  Intel-MID cleanups"

* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  tracing/hyper-v: Trace hyperv_mmu_flush_tlb_others()
  x86/hyper-v: Support extended CPU ranges for TLB flush hypercalls
  x86/platform/intel-mid: Make several arrays static, to make code smaller
  MAINTAINERS: Add missed file for Hyper-V
  x86/hyper-v: Use hypercall for remote TLB flush
  hyper-v: Globalize vp_index
  x86/hyper-v: Implement rep hypercalls
  hyper-v: Use fast hypercall for HVCALL_SIGNAL_EVENT
  x86/hyper-v: Introduce fast hypercall implementation
  x86/hyper-v: Make hv_do_hypercall() inline
  x86/hyper-v: Include hyperv/ only when CONFIG_HYPERV is set
  x86/platform/intel-mid: Make 'bt_sfi_data' const
  x86/platform/intel-mid: Make IRQ allocation a bit more flexible
  x86/platform/intel-mid: Group timers callbacks together

Pull libata updates from Tejun Heo:
 "Except for the ahci fix that fixes a boot issue, nothing major in this
  pull request. Some new platform controller support and device specific
  changes"

* 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
  libata: zpodd: make arrays cdb static, reduces object code size
  ahci: don't use MSI for devices with the silly Intel NVMe remapping scheme
  dt-bindings: ata: add DT bindings for MediaTek SATA controller
  ata: mediatek: add support for MediaTek SATA controller
  pata_octeon_cf: use of_property_read_{bool|u32}()
  cs5536: add support for IDE controller variant
  ata: sata_gemini: Introduce explicit IDE pin control
  ata: sata_gemini: Retire custom pin control
  ata: ahci_platform: Add shutdown handler
  ata: sata_gemini: explicitly request exclusive reset control
  ata: Drop unnecessary static
  ata: Convert to using %pOF instead of full_name

Pull cgroup updates from Tejun Heo:
 "Several notable changes this cycle:

   - Thread mode was merged. This will be used for cgroup2 support for
     CPU and possibly other controllers. Unfortunately, CPU controller
     cgroup2 support didn't make this pull request but most contentions
     have been resolved and the support is likely to be merged before
     the next merge window.

   - cgroup.stat now shows the number of descendant cgroups.

   - cpuset now can enable the easier-to-configure v2 behavior on v1
     hierarchy"

* 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (21 commits)
  cpuset: Allow v2 behavior in v1 cgroup
  cgroup: Add mount flag to enable cpuset to use v2 behavior in v1 cgroup
  cgroup: remove unneeded checks
  cgroup: misc changes
  cgroup: short-circuit cset_cgroup_from_root() on the default hierarchy
  cgroup: re-use the parent pointer in cgroup_destroy_locked()
  cgroup: add cgroup.stat interface with basic hierarchy stats
  cgroup: implement hierarchy limits
  cgroup: keep track of number of descent cgroups
  cgroup: add comment to cgroup_enable_threaded()
  cgroup: remove unnecessary empty check when enabling threaded mode
  cgroup: update debug controller to print out thread mode information
  cgroup: implement cgroup v2 thread support
  cgroup: implement CSS_TASK_ITER_THREADED
  cgroup: introduce cgroup->dom_cgrp and threaded css_set handling
  cgroup: add @flags to css_task_iter_start() and implement CSS_TASK_ITER_PROCS
  cgroup: reorganize cgroup.procs / task write path
  cgroup: replace css_set walking populated test with testing cgrp->nr_populated_csets
  cgroup: distinguish local and children populated states
  cgroup: remove now unused list_head @pending in cgroup_apply_cftypes()
  ...

Pull workqueue updates from Tejun Heo:
 "Nothing major. I introduced a flag collsion bug during v4.13 cycle
  which is fixed in this pull request. Fortunately, the flag is for
  debugging / verification and the bug isn't critical"

* 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: Fix flag collision
  workqueue: Use TASK_IDLE
  workqueue: fix path to documentation
  workqueue: doc change for ST behavior on NUMA systems

Pull percpu updates from Tejun Heo:
 "A lot of changes for percpu this time around. percpu inherited the
  same area allocator from the original pre-virtual-address-mapped
  implementation. This was from the time when percpu allocator wasn't
  used all that much and the implementation was focused on simplicity,
  with the unfortunate computational complexity of O(number of areas
  allocated from the chunk) per alloc / free.

  With the increase in percpu usage, we're hitting cases where the lack
  of scalability is hurting. The most prominent one right now is bpf
  perpcu map creation / destruction which may allocate and free a lot of
  entries consecutively and it's likely that the problem will become
  more prominent in the future.

  To address the issue, Dennis replaced the area allocator with hinted
  bitmap allocator which is more consistent. While the new allocator
  does perform a bit worse in some cases, it outperforms the old
  allocator way more than an order of magnitude in other more common
  scenarios while staying mostly flat in CPU overhead and completely
  flat in memory consumption"

* 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: (27 commits)
  percpu: update header to contain bitmap allocator explanation.
  percpu: update pcpu_find_block_fit to use an iterator
  percpu: use metadata blocks to update the chunk contig hint
  percpu: update free path to take advantage of contig hints
  percpu: update alloc path to only scan if contig hints are broken
  percpu: keep track of the best offset for contig hints
  percpu: skip chunks if the alloc does not fit in the contig hint
  percpu: add first_bit to keep track of the first free in the bitmap
  percpu: introduce bitmap metadata blocks
  percpu: replace area map allocator with bitmap
  percpu: generalize bitmap (un)populated iterators
  percpu: increase minimum percpu allocation size and align first regions
  percpu: introduce nr_empty_pop_pages to help empty page accounting
  percpu: change the number of pages marked in the first_chunk pop bitmap
  percpu: combine percpu address checks
  percpu: modify base_addr to be region specific
  percpu: setup_first_chunk rename schunk/dchunk to chunk
  percpu: end chunk area maps page aligned for the populated bitmap
  percpu: unify allocation of schunk and dchunk
  percpu: setup_first_chunk remove dyn_size and consolidate logic
  ...

Merge updates from Andrew Morton:

 - various misc bits

 - DAX updates

 - OCFS2

 - most of MM

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (119 commits)
  mm,fork: introduce MADV_WIPEONFORK
  x86,mpx: make mpx depend on x86-64 to free up VMA flag
  mm: add /proc/pid/smaps_rollup
  mm: hugetlb: clear target sub-page last when clearing huge page
  mm: oom: let oom_reap_task and exit_mmap run concurrently
  swap: choose swap device according to numa node
  mm: replace TIF_MEMDIE checks by tsk_is_oom_victim
  mm, oom: do not rely on TIF_MEMDIE for memory reserves access
  z3fold: use per-cpu unbuddied lists
  mm, swap: don't use VMA based swap readahead if HDD is used as swap
  mm, swap: add sysfs interface for VMA based swap readahead
  mm, swap: VMA based swap readahead
  mm, swap: fix swap readahead marking
  mm, swap: add swap readahead hit statistics
  mm/vmalloc.c: don't reinvent the wheel but use existing llist API
  mm/vmstat.c: fix wrong comment
  selftests/memfd: add memfd_create hugetlbfs selftest
  mm/shmem: add hugetlbfs support to memfd_create()
  mm, devm_memremap_pages: use multi-order radix for ZONE_DEVICE lookups
  mm/vmalloc.c: halve the number of comparisons performed in pcpu_get_vm_areas()
  ...

While debugging a problem, I thought that using
cr4_set_bits_and_update_boot() to restore CR4.PCIDE would be
helpful.  It turns out to be counterproductive.

Add a comment documenting how this works.
Signed-off-by: NAndy Lutomirski <luto@kernel.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

When Linux brings a CPU down and back up, it switches to init_mm and then
loads swapper_pg_dir into CR3.  With PCID enabled, this has the side effect
of masking off the ASID bits in CR3.

This can result in some confusion in the TLB handling code.  If we
bring a CPU down and back up with any ASID other than 0, we end up
with the wrong ASID active on the CPU after resume.  This could
cause our internal state to become corrupt, although major
corruption is unlikely because init_mm doesn't have any user pages.
More obviously, if CONFIG_DEBUG_VM=y, we'll trip over an assertion
in the next context switch.  The result of *that* is a failure to
resume from suspend with probability 1 - 1/6^(cpus-1).

Fix it by reinitializing cpu_tlbstate on resume and CPU bringup.
Reported-by: NLinus Torvalds <torvalds@linux-foundation.org>
Reported-by: NJiri Kosina <jikos@kernel.org>
Fixes: 10af6235 ("x86/mm: Implement PCID based optimization: try to preserve old TLB entries using PCID")
Signed-off-by: NAndy Lutomirski <luto@kernel.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Introduce MADV_WIPEONFORK semantics, which result in a VMA being empty
in the child process after fork.  This differs from MADV_DONTFORK in one
important way.

If a child process accesses memory that was MADV_WIPEONFORK, it will get
zeroes.  The address ranges are still valid, they are just empty.

If a child process accesses memory that was MADV_DONTFORK, it will get a
segmentation fault, since those address ranges are no longer valid in
the child after fork.

Since MADV_DONTFORK also seems to be used to allow very large programs
to fork in systems with strict memory overcommit restrictions, changing
the semantics of MADV_DONTFORK might break existing programs.

MADV_WIPEONFORK only works on private, anonymous VMAs.

The use case is libraries that store or cache information, and want to
know that they need to regenerate it in the child process after fork.

Examples of this would be:
 - systemd/pulseaudio API checks (fail after fork) (replacing a getpid
   check, which is too slow without a PID cache)
 - PKCS#11 API reinitialization check (mandated by specification)
 - glibc's upcoming PRNG (reseed after fork)
 - OpenSSL PRNG (reseed after fork)

The security benefits of a forking server having a re-inialized PRNG in
every child process are pretty obvious.  However, due to libraries
having all kinds of internal state, and programs getting compiled with
many different versions of each library, it is unreasonable to expect
calling programs to re-initialize everything manually after fork.

A further complication is the proliferation of clone flags, programs
bypassing glibc's functions to call clone directly, and programs calling
unshare, causing the glibc pthread_atfork hook to not get called.

It would be better to have the kernel take care of this automatically.

The patch also adds MADV_KEEPONFORK, to undo the effects of a prior
MADV_WIPEONFORK.

This is similar to the OpenBSD minherit syscall with MAP_INHERIT_ZERO:

    https://man.openbsd.org/minherit.2

[akpm@linux-foundation.org: numerically order arch/parisc/include/uapi/asm/mman.h #defines]
Link: http://lkml.kernel.org/r/20170811212829.29186-3-riel@redhat.comSigned-off-by: NRik van Riel <riel@redhat.com>
Reported-by: NFlorian Weimer <fweimer@redhat.com>
Reported-by: NColm MacCártaigh <colm@allcosts.net>
Reviewed-by: NMike Kravetz <mike.kravetz@oracle.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Cc: <linux-api@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>