Prior to Linux v5.4 devtmpfs used mount_single() which treats the given
mount options as "remount" options, so it updates the configuration of
the single super_block on each mount.

Since that was changed, the mount options used for devtmpfs are ignored.
This is a regression which affect systemd - which mounts devtmpfs with
"-o mode=755,size=4m,nr_inodes=1m".

This patch restores the "remount" effect by calling reconfigure_single()

Fixes: d401727e ("devtmpfs: don't mix {ramfs,shmem}_fill_super() with mount_single()")
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull fbdev maintainership update from Helge Deller:
 "The fbdev layer is orphaned, but seems to need some care. So I'd like
  to step up as new maintainer"

* tag 'fbdev-5.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev:
  MAINTAINERS: Add Helge as fbdev maintainer

Pull input updates from Dmitry Torokhov:
 "Updates to Goodix touchscreen driver (addition of pen support) and
  Silead touchscreen driver (also addition of pen support and parsing of
  embedded firmware to determine screen size), along with assorted fixes
  for other drivers"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: ti_am335x_tsc - fix a typo in a comment
  Input: zinitix - add compatible for bt532
  Input: zinitix - handle proper supply names
  dt-bindings: input/ts/zinitix: Convert to YAML, fix and extend
  Input: axp20x-pek - revert "always register interrupt handlers" change
  Input: gpio-keys - avoid clearing twice some memory
  Input: byd - fix typo in a comment
  Input: ucb1400_ts - remove redundant variable penup
  Input: ti_am335x_tsc - lower the X and Y sampling time
  Input: ti_am335x_tsc - fix STEPCONFIG setup for Z2
  Input: ti_am335x_tsc - set ADCREFM for X configuration
  Input: silead - add pen support
  Input: silead - add support for EFI-embedded fw using different min/max coordinates
  Input: goodix - 2 small fixes for pen support
  Input: goodix - improve gpiod_get() error logging
  Input: goodix - add pen support
  Input: ff-core - correct magnitude setting for rumble compatibility
  Input: palmas-pwrbutton - make a couple of arrays static const
  Input: wacom_i2c - clean up the query device fields
  Input: palmas-pwrbutton - use bitfield helpers

Pull i3c updates from Alexandre Belloni:
 "Mostly non urgent fixes and a few improvements (including runtime pm
  suport) to the Silvaco driver"

* tag 'i3c/for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux:
  i3c: master: dw: check return of dw_i3c_master_get_free_pos()
  i3c: master: mipi-i3c-hci: correct the config reference for endianness
  i3c: master: svc: enable the interrupt in the enable ibi function
  i3c: master: svc: add the missing module device table
  i3c: master: svc: add runtime pm support
  i3c: master: svc: set ODSTOP to let I2C device see the STOP signal
  i3c: master: svc: add support for slave to stop returning data
  i3c: master: svc: separate err, fifo and disable interrupt of reset function
  i3c: master: svc: fix atomic issue
  i3c: master: svc: move module reset behind clk enable
  i3c/master/mipi-i3c-hci: Fix a potentially infinite loop in 'hci_dat_v1_get_index()'
  i3c: fix incorrect address slot lookup on 64-bit
  i3c/master/mipi-i3c-hci: Prefer kcalloc over open coded arithmetic
  i3c/master/mipi-i3c-hci: Prefer struct_size over open coded arithmetic

Pull NTB updates from Jon Mason:
 "New AMD PCI ID for NTB, and a number of bug fixes for ntb_hw_switchtec
  for Linux v5.17"

* tag 'ntb-5.17' of git://github.com/jonmason/ntb:
  ntb_hw_switchtec: Fix a minor issue in config_req_id_table()
  ntb_hw_switchtec: Remove code for disabling ID protection
  ntb_hw_switchtec: Update the way of getting VEP instance ID
  ntb_hw_switchtec: AND with the part_map for a valid tpart_vec
  ntb_hw_switchtec: Fix bug with more than 32 partitions
  ntb_hw_switchtec: Fix pff ioread to read into mmio_part_cfg_all
  ntb_hw_switchtec: fix the spelling of "its"
  NTB/msi: Fix ntbm_msi_request_threaded_irq() kernel-doc comment
  ntb_hw_amd: Add NTB PCI ID for new gen CPU

Pull watchdog updates from Wim Van Sebroeck:

 - New device support:
     - Watchdog Timer driver for RZ/G2L
     - Realtek Otto watchdog timer
     - Apple SoC watchdog driver
     - Fintek F81966

 - Remove BCM63XX_WDT after support for this SoC was added to
   BCM7038_WDT

 - Improvements of the BCM7038_WDT and s3c2410_wdt code

 - Several other fixes and improvements

* tag 'linux-watchdog-5.17-rc1' of git://www.linux-watchdog.org/linux-watchdog: (38 commits)
  watchdog: msc313e: Check if the WDT was running at boot
  watchdog: Add Apple SoC watchdog driver
  dt-bindings: watchdog: Add SM6350 and SM8250 compatible
  watchdog: s3c2410: Fix getting the optional clock
  watchdog: s3c2410: Use platform_get_irq() to get the interrupt
  dt-bindings: watchdog: atmel: Add missing 'interrupts' property
  watchdog: mtk_wdt: use platform_get_irq_optional
  watchdog: Add Watchdog Timer driver for RZ/G2L
  dt-bindings: watchdog: renesas,wdt: Add support for RZ/G2L
  watchdog: da9063: Add hard dependency on I2C
  watchdog: Add Realtek Otto watchdog timer
  dt-bindings: watchdog: Realtek Otto WDT binding
  watchdog: s3c2410: Add Exynos850 support
  watchdog: da9063: use atomic safe i2c transfer in reset handler
  watchdog: davinci: Use div64_ul instead of do_div
  watchdog: Remove BCM63XX_WDT
  MIPS: BCM63XX: Provide platform data to watchdog device
  watchdog: bcm7038_wdt: Add platform device id for bcm63xx-wdt
  watchdog: Allow building BCM7038_WDT for BCM63XX
  watchdog: bcm7038_wdt: Support platform data configuration
  ...

Pull coccinelle updates from Julia Lawall:
 "Remove some semantic patches and remove a maintainer.

  Qing Wang <wangqing@vivo.com> reported that fen.cocci mostly finds
  false positives, so it is dropped.
  scripts/coccinelle/iterators/for_each_child.cocci also subsumes it, in
  a more correct way.

  Matthew Wilcox <willy@infradead.org> reported that bugon.cocci mostly
  gives false positives. It is an old script and was designed to be
  inaccurate to maximally cover problems, but most of what it is useful
  for has been done already.

  Gilles Muller passed away and is thus dropped from the maintainers
  list"

* 'for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux:
  drop fen.cocci
  scripts/coccinelle: drop bugon.cocci
  MAINTAINERS: remove Gilles Muller

Pull module updates from Luis Chamberlain:
 "The biggest change here is in-kernel support for module decompression.
  This change is being made to help support LSMs like LoadPin as
  otherwise it loses link between the source of kernel module on the
  disk and binary blob that is being loaded into the kernel.

  kmod decompression is still done by userspace even with this is done,
  both because there are no measurable gains in not doing so and as it
  adds a secondary extra check for validating the module before loading
  it into the kernel.

  The rest of the changes are minor, the only other change worth
  mentionin there is Jessica Yu is now bowing out of maintenance of
  modules as she's taking a break from work.

  While there were other changes posted for modules, those have not yet
  received much review of testing so I'm not yet comfortable in merging
  any of those changes yet."

* 'modules-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux:
  module: fix signature check failures when using in-kernel decompression
  kernel: Fix spelling mistake "compresser" -> "compressor"
  MAINTAINERS: add mailing lists for kmod and modules
  module.h: allow #define strings to work with MODULE_IMPORT_NS
  module: add in-kernel support for decompressing
  MAINTAINERS: Remove myself as modules maintainer
  module: Remove outdated comment

Commit 2b3d0478 ("unicode: Add utf8-data module") changed the
generated utf8data file from 'utf8data.h' to 'utf8data.c', but didn't
change the comments or the .gitignore to match.

The comments should be updated too, but at least they don't cause any
visible breakage.  But the gitignore file needs changing to avoid git
complaining about untracked files.

Fixes: 2b3d0478 ("unicode: Add utf8-data module")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

Pull signal/exit/ptrace updates from Eric Biederman:
 "This set of changes deletes some dead code, makes a lot of cleanups
  which hopefully make the code easier to follow, and fixes bugs found
  along the way.

  The end-game which I have not yet reached yet is for fatal signals
  that generate coredumps to be short-circuit deliverable from
  complete_signal, for force_siginfo_to_task not to require changing
  userspace configured signal delivery state, and for the ptrace stops
  to always happen in locations where we can guarantee on all
  architectures that the all of the registers are saved and available on
  the stack.

  Removal of profile_task_ext, profile_munmap, and profile_handoff_task
  are the big successes for dead code removal this round.

  A bunch of small bug fixes are included, as most of the issues
  reported were small enough that they would not affect bisection so I
  simply added the fixes and did not fold the fixes into the changes
  they were fixing.

  There was a bug that broke coredumps piped to systemd-coredump. I
  dropped the change that caused that bug and replaced it entirely with
  something much more restrained. Unfortunately that required some
  rebasing.

  Some successes after this set of changes: There are few enough calls
  to do_exit to audit in a reasonable amount of time. The lifetime of
  struct kthread now matches the lifetime of struct task, and the
  pointer to struct kthread is no longer stored in set_child_tid. The
  flag SIGNAL_GROUP_COREDUMP is removed. The field group_exit_task is
  removed. Issues where task->exit_code was examined with
  signal->group_exit_code should been examined were fixed.

  There are several loosely related changes included because I am
  cleaning up and if I don't include them they will probably get lost.

  The original postings of these changes can be found at:
     https://lkml.kernel.org/r/87a6ha4zsd.fsf@email.froward.int.ebiederm.org
     https://lkml.kernel.org/r/87bl1kunjj.fsf@email.froward.int.ebiederm.org
     https://lkml.kernel.org/r/87r19opkx1.fsf_-_@email.froward.int.ebiederm.org

  I trimmed back the last set of changes to only the obviously correct
  once. Simply because there was less time for review than I had hoped"

* 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (44 commits)
  ptrace/m68k: Stop open coding ptrace_report_syscall
  ptrace: Remove unused regs argument from ptrace_report_syscall
  ptrace: Remove second setting of PT_SEIZED in ptrace_attach
  taskstats: Cleanup the use of task->exit_code
  exit: Use the correct exit_code in /proc/<pid>/stat
  exit: Fix the exit_code for wait_task_zombie
  exit: Coredumps reach do_group_exit
  exit: Remove profile_handoff_task
  exit: Remove profile_task_exit & profile_munmap
  signal: clean up kernel-doc comments
  signal: Remove the helper signal_group_exit
  signal: Rename group_exit_task group_exec_task
  coredump: Stop setting signal->group_exit_task
  signal: Remove SIGNAL_GROUP_COREDUMP
  signal: During coredumps set SIGNAL_GROUP_EXIT in zap_process
  signal: Make coredump handling explicit in complete_signal
  signal: Have prepare_signal detect coredumps using signal->core_state
  signal: Have the oom killer detect coredumps using signal->core_state
  exit: Move force_uaccess back into do_exit
  exit: Guarantee make_task_dead leaks the tsk when calling do_task_exit
  ...

Pull unicode updates from Gabriel Krisman Bertazi:
 "This includes patches from Christoph Hellwig to split the large data
  tables of the unicode subsystem into a loadable module, which allow
  users to not have them around if case-insensitive filesystems are not
  to be used. It also includes minor code fixes to unicode and its
  users, from the same author.

  All the patches here have been on linux-next releases for the past
  months"

* tag 'unicode-for-next-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/krisman/unicode:
  unicode: only export internal symbols for the selftests
  unicode: Add utf8-data module
  unicode: cache the normalization tables in struct unicode_map
  unicode: move utf8cursor to utf8-selftest.c
  unicode: simplify utf8len
  unicode: remove the unused utf8{,n}age{min,max} functions
  unicode: pass a UNICODE_AGE() tripple to utf8_load
  unicode: mark the version field in struct unicode_map unsigned
  unicode: remove the charset field from struct unicode_map
  f2fs: simplify f2fs_sb_read_encoding
  ext4: simplify ext4_sb_read_encoding

Pull kvm updates from Paolo Bonzini:
 "RISCV:

   - Use common KVM implementation of MMU memory caches

   - SBI v0.2 support for Guest

   - Initial KVM selftests support

   - Fix to avoid spurious virtual interrupts after clearing hideleg CSR

   - Update email address for Anup and Atish

  ARM:

   - Simplification of the 'vcpu first run' by integrating it into KVM's
     'pid change' flow

   - Refactoring of the FP and SVE state tracking, also leading to a
     simpler state and less shared data between EL1 and EL2 in the nVHE
     case

   - Tidy up the header file usage for the nvhe hyp object

   - New HYP unsharing mechanism, finally allowing pages to be unmapped
     from the Stage-1 EL2 page-tables

   - Various pKVM cleanups around refcounting and sharing

   - A couple of vgic fixes for bugs that would trigger once the vcpu
     xarray rework is merged, but not sooner

   - Add minimal support for ARMv8.7's PMU extension

   - Rework kvm_pgtable initialisation ahead of the NV work

   - New selftest for IRQ injection

   - Teach selftests about the lack of default IPA space and page sizes

   - Expand sysreg selftest to deal with Pointer Authentication

   - The usual bunch of cleanups and doc update

  s390:

   - fix sigp sense/start/stop/inconsistency

   - cleanups

  x86:

   - Clean up some function prototypes more

   - improved gfn_to_pfn_cache with proper invalidation, used by Xen
     emulation

   - add KVM_IRQ_ROUTING_XEN_EVTCHN and event channel delivery

   - completely remove potential TOC/TOU races in nested SVM consistency
     checks

   - update some PMCs on emulated instructions

   - Intel AMX support (joint work between Thomas and Intel)

   - large MMU cleanups

   - module parameter to disable PMU virtualization

   - cleanup register cache

   - first part of halt handling cleanups

   - Hyper-V enlightened MSR bitmap support for nested hypervisors

  Generic:

   - clean up Makefiles

   - introduce CONFIG_HAVE_KVM_DIRTY_RING

   - optimize memslot lookup using a tree

   - optimize vCPU array usage by converting to xarray"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (268 commits)
  x86/fpu: Fix inline prefix warnings
  selftest: kvm: Add amx selftest
  selftest: kvm: Move struct kvm_x86_state to header
  selftest: kvm: Reorder vcpu_load_state steps for AMX
  kvm: x86: Disable interception for IA32_XFD on demand
  x86/fpu: Provide fpu_sync_guest_vmexit_xfd_state()
  kvm: selftests: Add support for KVM_CAP_XSAVE2
  kvm: x86: Add support for getting/setting expanded xstate buffer
  x86/fpu: Add uabi_size to guest_fpu
  kvm: x86: Add CPUID support for Intel AMX
  kvm: x86: Add XCR0 support for Intel AMX
  kvm: x86: Disable RDMSR interception of IA32_XFD_ERR
  kvm: x86: Emulate IA32_XFD_ERR for guest
  kvm: x86: Intercept #NM for saving IA32_XFD_ERR
  x86/fpu: Prepare xfd_err in struct fpu_guest
  kvm: x86: Add emulation for IA32_XFD
  x86/fpu: Provide fpu_update_guest_xfd() for IA32_XFD emulation
  kvm: x86: Enable dynamic xfeatures at KVM_SET_CPUID2
  x86/fpu: Provide fpu_enable_guest_xfd_features() for KVM
  x86/fpu: Add guest support to xfd_enable_feature()
  ...

Merge tag 'hyperv-next-signed-20220114' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull hyperv updates from Wei Liu:

 - More patches for Hyper-V isolation VM support (Tianyu Lan)

 - Bug fixes and clean-up patches from various people

* tag 'hyperv-next-signed-20220114' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  scsi: storvsc: Fix storvsc_queuecommand() memory leak
  x86/hyperv: Properly deal with empty cpumasks in hyperv_flush_tlb_multi()
  Drivers: hv: vmbus: Initialize request offers message for Isolation VM
  scsi: storvsc: Fix unsigned comparison to zero
  swiotlb: Add CONFIG_HAS_IOMEM check around swiotlb_mem_remap()
  x86/hyperv: Fix definition of hv_ghcb_pg variable
  Drivers: hv: Fix definition of hypercall input & output arg variables
  net: netvsc: Add Isolation VM support for netvsc driver
  scsi: storvsc: Add Isolation VM support for storvsc driver
  hyper-v: Enable swiotlb bounce buffer for Isolation VM
  x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()
  swiotlb: Add swiotlb bounce buffer remap function for HV IVM

Pull tracing updates from Steven Rostedt:
 "New:

   - The Real Time Linux Analysis (RTLA) tool is added to the tools
     directory.

   - Can safely filter on user space pointers with: field.ustring ~
     "match-string"

   - eprobes can now be filtered like any other event.

   - trace_marker(_raw) now uses stream_open() to allow multiple threads
     to safely write to it. Note, this could possibly break existing
     user space, but we will not know until we hear about it, and then
     can revert the change if need be.

   - New field in events to display when bottom halfs are disabled.

   - Sorting of the ftrace functions are now done at compile time
     instead of at bootup.

  Infrastructure changes to support future efforts:

   - Added __rel_loc type for trace events. Similar to __data_loc but
     the offset to the dynamic data is based off of the location of the
     descriptor and not the beginning of the event. Needed for user
     defined events.

   - Some simplification of event trigger code.

   - Make synthetic events process its callback better to not hinder
     other event callbacks that are registered. Needed for user defined
     events.

  And other small fixes and cleanups"

* tag 'trace-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (50 commits)
  tracing: Add ustring operation to filtering string pointers
  rtla: Add rtla timerlat hist documentation
  rtla: Add rtla timerlat top documentation
  rtla: Add rtla timerlat documentation
  rtla: Add rtla osnoise hist documentation
  rtla: Add rtla osnoise top documentation
  rtla: Add rtla osnoise man page
  rtla: Add Documentation
  rtla/timerlat: Add timerlat hist mode
  rtla: Add timerlat tool and timelart top mode
  rtla/osnoise: Add the hist mode
  rtla/osnoise: Add osnoise top mode
  rtla: Add osnoise tool
  rtla: Helper functions for rtla
  rtla: Real-Time Linux Analysis tool
  tracing/osnoise: Properly unhook events if start_per_cpu_kthreads() fails
  tracing: Remove duplicate warnings when calling trace_create_file()
  tracing/kprobes: 'nmissed' not showed correctly for kretprobe
  tracing: Add test for user space strings when filtering on string pointers
  tracing: Have syscall trace events use trace_event_buffer_lock_reserve()
  ...

Merge tag 'livepatching-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching

Pull livepatching updates from Petr Mladek:

 - Correctly handle kobjects when a livepatch init fails

 - Avoid CPU hogging when searching for many livepatched symbols

 - Add livepatch API page into documentation

* tag 'livepatching-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching:
  livepatch: Avoid CPU hogging with cond_resched
  livepatch: Fix missing unlock on error in klp_enable_patch()
  livepatch: Fix kobject refcount bug on klp_init_patch_early failure path
  Documentation: livepatch: Add livepatch API page

Pull pci updates from Bjorn Helgaas:
 "Enumeration:
   - Use pci_find_vsec_capability() instead of open-coding it (Andy
     Shevchenko)
   - Convert pci_dev_present() stub from macro to static inline to avoid
     'unused variable' errors (Hans de Goede)
   - Convert sysfs slot attributes from default_attrs to default_groups
     (Greg Kroah-Hartman)
   - Use DWORD accesses for LTR, L1 SS to avoid BayHub OZ711LV2 erratum
     (Rajat Jain)
   - Remove unnecessary initialization of static variables (Longji Guo)

  Resource management:
   - Always write Intel I210 ROM BAR on update to work around device
     defect (Bjorn Helgaas)

  PCIe native device hotplug:
   - Fix pciehp lockdep errors on Thunderbolt undock (Hans de Goede)
   - Fix infinite loop in pciehp IRQ handler on power fault (Lukas
     Wunner)

  Power management:
   - Convert amd64-agp, sis-agp, via-agp from legacy PCI power
     management to generic power management (Vaibhav Gupta)

  IOMMU:
   - Add function 1 DMA alias quirk for Marvell 88SE9125 SATA controller
     so it can work with an IOMMU (Yifeng Li)

  Error handling:
   - Add PCI_ERROR_RESPONSE and related definitions for signaling and
     checking for transaction errors on PCI (Naveen Naidu)
   - Fabricate PCI_ERROR_RESPONSE data (~0) in config read wrappers,
     instead of in host controller drivers, when transactions fail on
     PCI (Naveen Naidu)
   - Use PCI_POSSIBLE_ERROR() to check for possible failure of config
     reads (Naveen Naidu)

  Peer-to-peer DMA:
   - Add Logan Gunthorpe as P2PDMA maintainer (Bjorn Helgaas)

  ASPM:
   - Calculate link L0s and L1 exit latencies when needed instead of
     caching them (Saheed O. Bolarinwa)
   - Calculate device L0s and L1 acceptable exit latencies when needed
     instead of caching them (Saheed O. Bolarinwa)
   - Remove struct aspm_latency since it's no longer needed (Saheed O.
     Bolarinwa)

  APM X-Gene PCIe controller driver:
   - Fix IB window setup, which was broken by the fact that IB resources
     are now sorted in address order instead of DT dma-ranges order (Rob
     Herring)

  Apple PCIe controller driver:
   - Enable clock gating to save power (Hector Martin)
   - Fix REFCLK1 enable/poll logic (Hector Martin)

  Broadcom STB PCIe controller driver:
   - Declare bitmap correctly for use by bitmap interfaces (Christophe
     JAILLET)
   - Clean up computation of legacy and non-legacy MSI bitmasks (Florian
     Fainelli)
   - Update suspend/resume/remove error handling to warn about errors
     and not fail the operation (Jim Quinlan)
   - Correct the "pcie" and "msi" interrupt descriptions in DT binding
     (Jim Quinlan)
   - Add DT bindings for endpoint voltage regulators (Jim Quinlan)
   - Split brcm_pcie_setup() into two functions (Jim Quinlan)
   - Add mechanism for turning on voltage regulators for connected
     devices (Jim Quinlan)
   - Turn voltage regulators for connected devices on/off when bus is
     added or removed (Jim Quinlan)
   - When suspending, don't turn off voltage regulators for wakeup
     devices (Jim Quinlan)

  Freescale i.MX6 PCIe controller driver:
   - Add i.MX8MM support (Richard Zhu)

  Freescale Layerscape PCIe controller driver:
   - Use DWC common ops instead of layerscape-specific link-up functions
     (Hou Zhiqiang)

  Intel VMD host bridge driver:
   - Honor platform ACPI _OSC feature negotiation for Root Ports below
     VMD (Kai-Heng Feng)
   - Add support for Raptor Lake SKUs (Karthik L Gopalakrishnan)
   - Reset everything below VMD before enumerating to work around
     failure to enumerate NVMe devices when guest OS reboots (Nirmal
     Patel)

  Bridge emulation (used by Marvell Aardvark and MVEBU):
   - Make emulated ROM BAR read-only by default (Pali Rohár)
   - Make some emulated legacy PCI bits read-only for PCIe devices (Pali
     Rohár)
   - Update reserved bits in emulated PCIe Capability (Pali Rohár)
   - Allow drivers to emulate different PCIe Capability versions (Pali
     Rohár)
   - Set emulated Capabilities List bit for all PCIe devices, since they
     must have at least a PCIe Capability (Pali Rohár)

  Marvell Aardvark PCIe controller driver:
   - Add bridge emulation definitions for PCIe DEVCAP2, DEVCTL2,
     DEVSTA2, LNKCAP2, LNKCTL2, LNKSTA2, SLTCAP2, SLTCTL2, SLTSTA2 (Pali
     Rohár)
   - Add aardvark support for DEVCAP2, DEVCTL2, LNKCAP2 and LNKCTL2
     registers (Pali Rohár)
   - Clear all MSIs at setup to avoid spurious interrupts (Pali Rohár)
   - Disable bus mastering when unbinding host controller driver (Pali
     Rohár)
   - Mask all interrupts when unbinding host controller driver (Pali
     Rohár)
   - Fix memory leak in host controller unbind (Pali Rohár)
   - Assert PERST# when unbinding host controller driver (Pali Rohár)
   - Disable link training when unbinding host controller driver (Pali
     Rohár)
   - Disable common PHY when unbinding host controller driver (Pali
     Rohár)
   - Fix resource type checking to check only IORESOURCE_MEM, not
     IORESOURCE_MEM_64, which is a flavor of IORESOURCE_MEM (Pali Rohár)

  Marvell MVEBU PCIe controller driver:
   - Implement pci_remap_iospace() for ARM so mvebu can use
     devm_pci_remap_iospace() instead of the previous ARM-specific
     pci_ioremap_io() interface (Pali Rohár)
   - Use the standard pci_host_probe() instead of the device-specific
     mvebu_pci_host_probe() (Pali Rohár)
   - Replace all uses of ARM-specific pci_ioremap_io() with the ARM
     implementation of the standard pci_remap_iospace() interface and
     remove pci_ioremap_io() (Pali Rohár)
   - Skip initializing invalid Root Ports (Pali Rohár)
   - Check for errors from pci_bridge_emul_init() (Pali Rohár)
   - Ignore any bridges at non-zero function numbers (Pali Rohár)
   - Return ~0 data for invalid config read size (Pali Rohár)
   - Disallow mapping interrupts on emulated bridges (Pali Rohár)
   - Clear Root Port Memory & I/O Space Enable and Bus Master Enable at
     initialization (Pali Rohár)
   - Make type bits in Root Port I/O Base register read-only (Pali
     Rohár)
   - Disable Root Port windows when base/limit set to invalid values
     (Pali Rohár)
   - Set controller to Root Complex mode (Pali Rohár)
   - Set Root Port Class Code to PCI Bridge (Pali Rohár)
   - Update emulated Root Port secondary bus numbers to better reflect
     the actual topology (Pali Rohár)
   - Add PCI_BRIDGE_CTL_BUS_RESET support to emulated Root Ports so
     pci_reset_secondary_bus() can reset connected devices (Pali Rohár)
   - Add PCI_EXP_DEVCTL Error Reporting Enable support to emulated Root
     Ports (Pali Rohár)
   - Add PCI_EXP_RTSTA PME Status bit support to emulated Root Ports
     (Pali Rohár)
   - Add DEVCAP2, DEVCTL2 and LNKCTL2 support to emulated Root Ports on
     Armada XP and newer devices (Pali Rohár)
   - Export mvebu-mbus.c symbols to allow pci-mvebu.c to be a module
     (Pali Rohár)
   - Add support for compiling as a module (Pali Rohár)

  MediaTek PCIe controller driver:
   - Assert PERST# for 100ms to allow power and clock to stabilize
     (qizhong cheng)

  MediaTek PCIe Gen3 controller driver:
   - Disable Mediatek DVFSRC voltage request since lack of DVFSRC to
     respond to the request causes failure to exit L1 PM Substate
     (Jianjun Wang)

  MediaTek MT7621 PCIe controller driver:
   - Declare mt7621_pci_ops static (Sergio Paracuellos)
   - Give pcibios_root_bridge_prepare() access to host bridge windows
     (Sergio Paracuellos)
   - Move MIPS I/O coherency unit setup from driver to
     pcibios_root_bridge_prepare() (Sergio Paracuellos)
   - Add missing MODULE_LICENSE() (Sergio Paracuellos)
   - Allow COMPILE_TEST for all arches (Sergio Paracuellos)

  Microsoft Hyper-V host bridge driver:
   - Add hv-internal interfaces to encapsulate arch IRQ dependencies
     (Sunil Muthuswamy)
   - Add arm64 Hyper-V vPCI support (Sunil Muthuswamy)

  Qualcomm PCIe controller driver:
   - Undo PM setup in qcom_pcie_probe() error handling path (Christophe
     JAILLET)
   - Use __be16 type to store return value from cpu_to_be16()
     (Manivannan Sadhasivam)
   - Constify static dw_pcie_ep_ops (Rikard Falkeborn)

  Renesas R-Car PCIe controller driver:
   - Fix aarch32 abort handler so it doesn't check the wrong bus clock
     before accessing the host controller (Marek Vasut)

  TI Keystone PCIe controller driver:
   - Add register offset for ti,syscon-pcie-id and ti,syscon-pcie-mode
     DT properties (Kishon Vijay Abraham I)

  MicroSemi Switchtec management driver:
   - Add Gen4 automotive device IDs (Kelvin Cao)
   - Declare state_names[] as static so it's not allocated and
     initialized for every call (Kelvin Cao)

  Host controller driver cleanups:
   - Use of_device_get_match_data(), not of_match_device(), when we only
     need the device data in altera, artpec6, cadence, designware-plat,
     dra7xx, keystone, kirin (Fan Fei)
   - Drop pointless of_device_get_match_data() cast in j721e (Bjorn
     Helgaas)
   - Drop redundant struct device * from j721e since struct cdns_pcie
     already has one (Bjorn Helgaas)
   - Rename driver structs to *_pcie in intel-gw, iproc, ls-gen4,
     mediatek-gen3, microchip, mt7621, rcar-gen2, tegra194, uniphier,
     xgene, xilinx, xilinx-cpm for consistency across drivers (Fan Fei)
   - Fix invalid address space conversions in hisi, spear13xx (Bjorn
     Helgaas)

  Miscellaneous:
   - Sort Intel Device IDs by value (Andy Shevchenko)
   - Change Capability offsets to hex to match spec (Baruch Siach)
   - Correct misspellings (Krzysztof Wilczyński)
   - Terminate statement with semicolon in pci_endpoint_test.c (Ming
     Wang)"

* tag 'pci-v5.17-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (151 commits)
  PCI: mt7621: Allow COMPILE_TEST for all arches
  PCI: mt7621: Add missing MODULE_LICENSE()
  PCI: mt7621: Move MIPS setup to pcibios_root_bridge_prepare()
  PCI: Let pcibios_root_bridge_prepare() access bridge->windows
  PCI: mt7621: Declare mt7621_pci_ops static
  PCI: brcmstb: Do not turn off WOL regulators on suspend
  PCI: brcmstb: Add control of subdevice voltage regulators
  PCI: brcmstb: Add mechanism to turn on subdev regulators
  PCI: brcmstb: Split brcm_pcie_setup() into two funcs
  dt-bindings: PCI: Add bindings for Brcmstb EP voltage regulators
  dt-bindings: PCI: Correct brcmstb interrupts, interrupt-map.
  PCI: brcmstb: Fix function return value handling
  PCI: brcmstb: Do not use __GENMASK
  PCI: brcmstb: Declare 'used' as bitmap, not unsigned long
  PCI: hv: Add arm64 Hyper-V vPCI support
  PCI: hv: Make the code arch neutral by adding arch specific interfaces
  PCI: pciehp: Use down_read/write_nested(reset_lock) to fix lockdep errors
  x86/PCI: Remove initialization of static variables to false
  PCI: Use DWORD accesses for LTR, L1 SS to avoid erratum
  misc: pci_endpoint_test: Terminate statement with semicolon
  ...

Pull exfat updates from Namjae Jeon:

 - Fix ->i_blocks truncation issue that still exists elsewhere.

 - Four cleanups & typos fixes.

 - Move super block magic number to magic.h

 - Fix missing REQ_SYNC in exfat_update_bhs().

* tag 'exfat-for-5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat:
  exfat: fix missing REQ_SYNC in exfat_update_bhs()
  exfat: remove argument 'sector' from exfat_get_dentry()
  exfat: move super block magic number to magic.h
  exfat: fix i_blocks for files truncated over 4 GiB
  exfat: reuse exfat_inode_info variable instead of calling EXFAT_I()
  exfat: make exfat_find_location() static
  exfat: fix typos in comments
  exfat: simplify is_valid_cluster()

Pull nfsd updates from Chuck Lever:
 "Bruce has announced he is leaving Red Hat at the end of the month and
  is stepping back from his role as NFSD co-maintainer. As a result,
  this includes a patch removing him from the MAINTAINERS file.

  There is one patch in here that Jeff Layton was carrying in the locks
  tree. Since he had only one for this cycle, he asked us to send it to
  you via the nfsd tree.

  There continues to be 0-day reports from Robert Morris @MIT. This time
  we include a fix for a crash in the COPY_NOTIFY operation.

  Highlights:
   - Bruce steps down as NFSD maintainer
   - Prepare for dynamic nfsd thread management
   - More work on supporting re-exporting NFS mounts
   - One fs/locks patch on behalf of Jeff Layton

  Notable bug fixes:
   - Fix zero-length NFSv3 WRITEs
   - Fix directory cinfo on FS's that do not support iversion
   - Fix WRITE verifiers for stable writes
   - Fix crash on COPY_NOTIFY with a special state ID"

* tag 'nfsd-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux: (51 commits)
  SUNRPC: Fix sockaddr handling in svcsock_accept_class trace points
  SUNRPC: Fix sockaddr handling in the svc_xprt_create_error trace point
  fs/locks: fix fcntl_getlk64/fcntl_setlk64 stub prototypes
  nfsd: fix crash on COPY_NOTIFY with special stateid
  MAINTAINERS: remove bfields
  NFSD: Move fill_pre_wcc() and fill_post_wcc()
  Revert "nfsd: skip some unnecessary stats in the v4 case"
  NFSD: Trace boot verifier resets
  NFSD: Rename boot verifier functions
  NFSD: Clean up the nfsd_net::nfssvc_boot field
  NFSD: Write verifier might go backwards
  nfsd: Add a tracepoint for errors in nfsd4_clone_file_range()
  NFSD: De-duplicate net_generic(nf->nf_net, nfsd_net_id)
  NFSD: De-duplicate net_generic(SVC_NET(rqstp), nfsd_net_id)
  NFSD: Clean up nfsd_vfs_write()
  nfsd: Replace use of rwsem with errseq_t
  NFSD: Fix verifier returned in stable WRITEs
  nfsd: Retry once in nfsd_open on an -EOPENSTALE return
  nfsd: Add errno mapping for EREMOTEIO
  nfsd: map EBADF
  ...

Pull 9p updates from Dominique Martinet:
 "Fixes, split 9p_net_fd, and new reviewer:

   - fix possible uninitialized memory usage for setattr

   - fix fscache reading hole in a file just after it's been grown

   - split net/9p/trans_fd.c in its own module like other transports.

     The new transport module defaults to 9P_NET and is autoloaded if
     required so users should not be impacted

   - add Christian Schoenebeck to 9p reviewers

   - some more trivial cleanup"

* tag '9p-for-5.17-rc1' of git://github.com/martinetd/linux:
  9p: fix enodata when reading growing file
  net/9p: show error message if user 'msize' cannot be satisfied
  MAINTAINERS: 9p: add Christian Schoenebeck as reviewer
  9p: only copy valid iattrs in 9P2000.L setattr implementation
  9p: Use BUG_ON instead of if condition followed by BUG.
  net/p9: load default transports
  9p/xen: autoload when xenbus service is available
  9p/trans_fd: split into dedicated module
  fs: 9p: remove unneeded variable
  9p/trans_virtio: Fix typo in the comment for p9_virtio_create()

Pull drm fixes from Daniel Vetter:
"drivers fixes:

   - i915 fixes for ttm backend + one pm wakelock fix

   - amdgpu fixes, fairly big pile of small things all over. Note this
     doesn't yet containe the fixed version of the otg sync patch that
     blew up

   - small driver fixes: meson, sun4i, vga16fb probe fix

  drm core fixes:

   - cma-buf heap locking

   - ttm compilation

   - self refresh helper state check

   - wrong error message in atomic helpers

   - mipi-dbi buffer mapping"

* tag 'drm-next-2022-01-14' of git://anongit.freedesktop.org/drm/drm: (49 commits)
  drm/mipi-dbi: Fix source-buffer address in mipi_dbi_buf_copy
  drm: fix error found in some cases after the patch d1af5cd86997
  drm/ttm: fix compilation on ARCH=um
  dma-buf: cma_heap: Fix mutex locking section
  video: vga16fb: Only probe for EGA and VGA 16 color graphic cards
  drm/amdkfd: Fix ASIC name typos
  drm/amdkfd: Fix DQM asserts on Hawaii
  drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2
  drm/amd/pm: only send GmiPwrDnControl msg on master die (v3)
  drm/amdgpu: use spin_lock_irqsave to avoid deadlock by local interrupt
  drm/amdgpu: not return error on the init_apu_flags
  drm/amdkfd: Use prange->update_list head for remove_list
  drm/amdkfd: Use prange->list head for insert_list
  drm/amdkfd: make SPDX License expression more sound
  drm/amdkfd: Check for null pointer after calling kmemdup
  drm/amd/display: invalid parameter check in dmub_hpd_callback
  Revert "drm/amdgpu: Don't inherit GEM object VMAs in child process"
  drm/amd/display: reset dcn31 SMU mailbox on failures
  drm/amdkfd: use default_groups in kobj_type
  drm/amdgpu: use default_groups in kobj_type
  ...

Pull memblock cleanup from Mike Rapoport:
 "Remove #ifdef __KERNEL__ from memblock.h

  memblock.h is not a uAPI header, so __KERNEL__ guard can be deleted"

* tag 'memblock-v5.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
  memblock: Remove #ifdef __KERNEL__ from memblock.h

Prepare input updates for 5.17 merge window.

Merge misc updates from Andrew Morton:
 "146 patches.

  Subsystems affected by this patch series: kthread, ia64, scripts,
  ntfs, squashfs, ocfs2, vfs, and mm (slab-generic, slab, kmemleak,
  dax, kasan, debug, pagecache, gup, shmem, frontswap, memremap,
  memcg, selftests, pagemap, dma, vmalloc, memory-failure, hugetlb,
  userfaultfd, vmscan, mempolicy, oom-kill, hugetlbfs, migration, thp,
  ksm, page-poison, percpu, rmap, zswap, zram, cleanups, hmm, and
  damon)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (146 commits)
  mm/damon: hide kernel pointer from tracepoint event
  mm/damon/vaddr: hide kernel pointer from damon_va_three_regions() failure log
  mm/damon/vaddr: use pr_debug() for damon_va_three_regions() failure logging
  mm/damon/dbgfs: remove an unnecessary variable
  mm/damon: move the implementation of damon_insert_region to damon.h
  mm/damon: add access checking for hugetlb pages
  Docs/admin-guide/mm/damon/usage: update for schemes statistics
  mm/damon/dbgfs: support all DAMOS stats
  Docs/admin-guide/mm/damon/reclaim: document statistics parameters
  mm/damon/reclaim: provide reclamation statistics
  mm/damon/schemes: account how many times quota limit has exceeded
  mm/damon/schemes: account scheme actions that successfully applied
  mm/damon: remove a mistakenly added comment for a future feature
  Docs/admin-guide/mm/damon/usage: update for kdamond_pid and (mk|rm)_contexts
  Docs/admin-guide/mm/damon/usage: mention tracepoint at the beginning
  Docs/admin-guide/mm/damon/usage: remove redundant information
  Docs/admin-guide/mm/damon/usage: update for scheme quotas and watermarks
  mm/damon: convert macro functions to static inline functions
  mm/damon: modify damon_rand() macro to static inline function
  mm/damon: move damon_rand() definition into damon.h
  ...

DAMON's virtual address spaces monitoring primitive uses 'struct pid *'
of the target process as its monitoring target id.  The kernel address
is exposed as-is to the user space via the DAMON tracepoint,
'damon_aggregated'.

Though primarily only privileged users are allowed to access that, it
would be better to avoid unnecessarily exposing kernel pointers so.
Because the trace result is only required to be able to distinguish each
target, we aren't need to use the pointer as-is.

This makes the tracepoint to use the index of the target in the
context's targets list as its id in the tracepoint, to hide the kernel
space address.

Link: https://lkml.kernel.org/r/20211229131016.23641-5-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The failure log message for 'damon_va_three_regions()' prints the target
id, which is a 'struct pid' pointer in the case.  To avoid exposing the
kernel pointer via the log, this makes the log to use the index of the
target in the context's targets list instead.

Link: https://lkml.kernel.org/r/20211229131016.23641-4-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Failure of 'damon_va_three_regions()' is logged using 'pr_err()'.  But,
the function can fail in legal situations.  To avoid making users be
surprised and to keep the kernel clean, this makes the log to be printed
using 'pr_debug()'.

Link: https://lkml.kernel.org/r/20211229131016.23641-3-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Patch series "mm/damon: Hide unnecessary information disclosures".

DAMON is exposing some unnecessary information including kernel pointer
in kernel log and tracepoint.  This patchset hides such information.
The first patch is only for a trivial cleanup, though.

This patch (of 4):

This commit removes a unnecessarily used variable in
dbgfs_target_ids_write().

Link: https://lkml.kernel.org/r/20211229131016.23641-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20211229131016.23641-2-sj@kernel.org
Fixes: 4bc05954 ("mm/damon: implement a debugfs-based user space interface")
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Usually, inline function is declared static since it should sit between
storage and type.  And implement it in a header file if used by multiple
files.

And this change also fixes compile issue when backport damon to 5.10.

  mm/damon/vaddr.c: In function `damon_va_evenly_split_region':
  ./include/linux/damon.h:425:13: error: inlining failed in call to `always_inline' `damon_insert_region': function body not available
  425 | inline void damon_insert_region(struct damon_region *r,
      | ^~~~~~~~~~~~~~~~~~~
  mm/damon/vaddr.c:86:3: note: called from here
  86 | damon_insert_region(n, r, next, t);
     | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Link: https://lkml.kernel.org/r/20211223085703.6142-1-guoqing.jiang@linux.devSigned-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The process's VMAs can be mapped by hugetlb page, but now the DAMON did
not implement the access checking for hugetlb pte, so we can not get the
actual access count like below if a process VMAs were mapped by hugetlb.

  damon_aggregated: target_id=18446614368406014464 nr_regions=12 4194304-5476352: 0 545
  damon_aggregated: target_id=18446614368406014464 nr_regions=12 140662370467840-140662372970496: 0 545
  damon_aggregated: target_id=18446614368406014464 nr_regions=12 140662372970496-140662375460864: 0 545
  damon_aggregated: target_id=18446614368406014464 nr_regions=12 140662375460864-140662377951232: 0 545
  damon_aggregated: target_id=18446614368406014464 nr_regions=12 140662377951232-140662380449792: 0 545
  damon_aggregated: target_id=18446614368406014464 nr_regions=12 140662380449792-140662382944256: 0 545
  ......

Thus this patch adds hugetlb access checking support, with this patch we
can see below VMA mapped by hugetlb access count.

  damon_aggregated: target_id=18446613056935405824 nr_regions=12 140296486649856-140296489914368: 1 3
  damon_aggregated: target_id=18446613056935405824 nr_regions=12 140296489914368-140296492978176: 1 3
  damon_aggregated: target_id=18446613056935405824 nr_regions=12 140296492978176-140296495439872: 1 3
  damon_aggregated: target_id=18446613056935405824 nr_regions=12 140296495439872-140296498311168: 1 3
  damon_aggregated: target_id=18446613056935405824 nr_regions=12 140296498311168-140296501198848: 1 3
  damon_aggregated: target_id=18446613056935405824 nr_regions=12 140296501198848-140296504320000: 1 3
  damon_aggregated: target_id=18446613056935405824 nr_regions=12 140296504320000-140296507568128: 1 2
  ......

[baolin.wang@linux.alibaba.com: fix unused var warning]
  Link: https://lkml.kernel.org/r/1aaf9c11-0d8e-b92d-5c92-46e50a6e8d4e@linux.alibaba.com
[baolin.wang@linux.alibaba.com: v3]
  Link: https://lkml.kernel.org/r/486927ecaaaecf2e3a7fbe0378ec6e1c58b50747.1640852276.git.baolin.wang@linux.alibaba.com

Link: https://lkml.kernel.org/r/6afcbd1fda5f9c7c24f320d26a98188c727ceec3.1639623751.git.baolin.wang@linux.alibaba.comSigned-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This updates DAMON debugfs interface for statistics of schemes
successfully applied regions and time/space quota limit exceeds counts.

Link: https://lkml.kernel.org/r/20211210150016.35349-7-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Currently, DAMON debugfs interface is not supporting DAMON-based
Operation Schemes (DAMOS) stats for schemes successfully applied regions
and time/space quota limit exceeds.  This adds the support.

Link: https://lkml.kernel.org/r/20211210150016.35349-6-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This adds descriptions for the DAMON_RECLAIM statistics parameters.

Link: https://lkml.kernel.org/r/20211210150016.35349-5-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This implements new DAMON_RECLAIM parameters for statistics reporting.
Those can be used for understanding how DAMON_RECLAIM is working, and
for tuning the other parameters.

Link: https://lkml.kernel.org/r/20211210150016.35349-4-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

If the time/space quotas of a given DAMON-based operation scheme is too
small, the scheme could show unexpectedly slow progress.  However, there
is no good way to notice the case in runtime.  This commit extends the
DAMOS stat to provide how many times the quota limits exceeded so that
the users can easily notice the case and tune the scheme.

Link: https://lkml.kernel.org/r/20211210150016.35349-3-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Patch series "mm/damon/schemes: Extend stats for better online analysis and tuning".

To help online access pattern analysis and tuning of DAMON-based
Operation Schemes (DAMOS), DAMOS provides simple statistics for each
scheme.  Introduction of DAMOS time/space quota further made the tuning
easier by making the risk management easier.  However, that also made
understanding of the working schemes a little bit more difficult.

For an example, progress of a given scheme can now be throttled by not
only the aggressiveness of the target access pattern, but also the
time/space quotas.  So, when a scheme is showing unexpectedly slow
progress, it's difficult to know by what the progress of the scheme is
throttled, with currently provided statistics.

This patchset extends the statistics to contain some metrics that can be
helpful for such online schemes analysis and tuning (patches 1-2),
exports those to users (patches 3 and 5), and add documents (patches 4
and 6).

This patch (of 6):

DAMON-based operation schemes (DAMOS) stats provide only the number and
the amount of regions that the action of the scheme has tried to be
applied.  Because the action could be failed for some reasons, the
currently provided information is sometimes not useful or convenient
enough for schemes profiling and tuning.  To improve this situation,
this commit extends the DAMOS stats to provide the number and the amount
of regions that the action has successfully applied.

Link: https://lkml.kernel.org/r/20211210150016.35349-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20211210150016.35349-2-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Due to a mistake in patches reordering, a comment for a future feature
called 'arbitrary monitoring target support'[1], which is still under
development, has added.  Because it only introduces confusion and we
don't have a plan to post the patches soon, this commit removes the
mistakenly added part.

[1] https://lore.kernel.org/linux-mm/20201215115448.25633-3-sjpark@amazon.com/

Link: https://lkml.kernel.org/r/20211209131806.19317-7-sj@kernel.org
Fixes: 1f366e42 ("mm/damon/core: implement DAMON-based Operation Schemes (DAMOS)")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The DAMON debugfs usage document is missing descriptions for
'kdamond_pid', 'mk_contexts', and 'rm_contexts' debugfs files.  This
commit adds those.

Link: https://lkml.kernel.org/r/20211209131806.19317-6-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

To get detailed monitoring results from the user space, users need to
use the damon_aggregated tracepoint.  This commit adds a brief mention
of it at the beginning of the usage document.

Link: https://lkml.kernel.org/r/20211209131806.19317-5-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

DAMON usage document mentions DAMON user space tool and programming
interface twice.  This commit integrates those and remove unnecessary
part.

Link: https://lkml.kernel.org/r/20211209131806.19317-4-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

DAMOS features including time/space quota limits and watermarks are not
described in the DAMON debugfs interface document.  This commit updates
the document for the features.

Link: https://lkml.kernel.org/r/20211209131806.19317-3-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>