Pull mount_setattr updates from Christian Brauner:
 "This contains a few more patches to massage the mount_setattr()
  codepaths and one minor fix to reuse a helper we added some time back.

  The final two patches do similar cleanups in different ways. One patch
  is mine and the other is Al's who was nice enough to give me a branch
  for it.

  Since his came in later and my branch had been sitting in -next for
  quite some time we just put his on top instead of swap them"

* tag 'fs.v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
  mount_setattr(): clean the control flow and calling conventions
  fs: clean up mount_setattr control flow
  fs: don't open-code mnt_hold_writers()
  fs: simplify check in mount_setattr_commit()
  fs: add mnt_allow_writers() and simplify mount_setattr_prepare()

Pull ARM devicetree updates from Arnd Bergmann:
 "After a somewhat quiet 5.17 release, the size of the DT changes is a
  bit larger again. There are nine new SoC that get added, all of them
  related to existing platforms:

   - Airoha (formerly Mediatek/EcoNet) EN7523 networking SoC and EVB

   - Mediatek mt6582 tablet platform with the Prestigio PMT5008 3G
     tablet

   - Microchip Lan966 networking SoC and it evaluation board

   - Qualcomm Snapdragon 625/632 midrange phone SoCs, with the LG Nexus
     5X and Fairphone FP3 phones

   - Renesas RZ/G2LC and RZ/V2L general-purpose embedded SoCs, along
     with their evaluation boards

   - Samsung Exynos 850 phone SoC and reference board

   - Samsung Exynos7885 with the Samsung Galaxy A8 (2018) phone

   - Tesla FSD (Fully Self-Driving), an automotive SoC loosely derived
     from the Samsung Exynos family.

   - TI K3/AM62 SoC and reference board

  Support for additional functionality in existing dts files is added
  all over the place: Samsung, Renesas, Mstar, wpcm450, OMAP, AT91,
  Allwinner, i.MX, Tegra, Aspeed, Oxnas, Qualcomm, Mediatek, and
  Broadcom.

  Samsung has a rework for its pinctrl schema that is a bit tricky and
  requires driver changes to be included here.

  A few more platforms only have smaller cleanups and DT Schema fixes,
  this includes SoCFPGA, ux500, ixp4xx, STi, Xilinx Zynq, LG, and Juno.

  The new machines are really too many to list, but I'll do it anyway:

  Allwinner:
   - A20-Marsboard development board

  Amlogic:
   - Amediatek X96-AIR (Amlogic S905X3)
   - CYX A95XF3-AIR (Amlogic S905X3)
   - Haochuangy H96-Max (Amlogic S905X3)
   - Amlogic AQ222 (Amlogic S4)
   - OSMC Vero 4K+ (Amlogic S905D)

  Arm Juno:
   - Separate DT depending on SCMI firmware version

  Aspeed:
   - Quanta S6Q BMC (AST2600)
   - ASRock ROMED8HM3 (AST2500)

  Broadcom:
   - Raspberry Pi Zero 2 W

  Marvell MVEBU/Armada:
   - Ctera C200 V1 NAS (kirkwood)
   - Ctera C200 V2 NAS (armada-370)

  Mstar:
   - DongShanPiOne, a low-end embedded board
   - Miyoo Mini handheld game console

  NXP i.MX:
   - Numerous i.MX8M Mini based boards in even more variations, but
    none based on other SoCs this time:
    Protonic PRT8MM, emCON-MX8M Mini, Toradex Verdin, and
    Gateworks GW7903

  Qualcomm:
   - Google Herobrine R1 Chromebook platform (Snapdragon 7c Gen 3)
   - SHIFT6mq phone (Snapdragon 845)
   - Samsung Galaxy Book2 (Snapdragon 850)
   - Snapdragon 8 Gen 1 Hardware Development Kit

  TI OMAP:
   - SanCloud BeagleBone Enhanced WiFi

  Rockchip:
   - Pine64 PineNote ereader tablet (rk356x)
   - Bananapi-R2-Pro (rk356x)

  STM32:
   - emtrion emSBS-Argon embedded board (stm32mp157c)"

* tag 'arm-dt-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (627 commits)
  arm64: dts: n5x: drop invalid property and fix edac node name
  arm64: dts: fsd: Add the MCT support
  arm64: dts: stingray: Fix spi clock name
  arm64: dts: ns2: Fix spi clock name
  ARM: dts: rockchip: Update regulator name for PX3
  ARM: dts: rockchip: Add #clock-cells value for rk805
  arm64: dts: rockchip: Add #clock-cells value for rk805
  arm64: dts: rockchip: Remove vcc13 and vcc14 for rk808
  arm64: dts: rockchip: Fix SDIO regulator supply properties on rk3399-firefly
  ARM: dts: at91: sama7g5: Add NAND support
  ARM: dts: at91: sama7g5: add eic node
  ARM: dts: at91: sama7g5: Remove unused properties in i2c nodes
  ARM: dts: at91: sam9x60ek: modify vdd_1v5 regulator to vdd_1v15
  arm64: dts: lg: align pl330 node name with dtschema
  arm64: dts: lg: add dma-cells to pl330 node
  arm64: dts: juno: align pl330 node name with dtschema
  arm64: dts: broadcom: Fix sata nodename
  arm64: dts: n5x: add sdr edac support
  arm64: dts: agilex/stratix10: add clock-names to USB DWC2 node
  dt-bindings: usb: dwc2: add disable-over-current
  ...

Pull ARM driver updates from Arnd Bergmann:
 "There are a few separately maintained driver subsystems that we merge
  through the SoC tree, notable changes are:

   - Memory controller updates, mainly for Tegra and Mediatek SoCs, and
     clarifications for the memory controller DT bindings

   - SCMI firmware interface updates, in particular a new transport
     based on OPTEE and support for atomic operations.

   - Cleanups to the TEE subsystem, refactoring its memory management

  For SoC specific drivers without a separate subsystem, changes include

   - Smaller updates and fixes for TI, AT91/SAMA5, Qualcomm and NXP
     Layerscape SoCs.

   - Driver support for Microchip SAMA5D29, Tesla FSD, Renesas RZ/G2L,
     and Qualcomm SM8450.

   - Better power management on Mediatek MT81xx, NXP i.MX8MQ and older
     NVIDIA Tegra chips"

* tag 'arm-drivers-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (154 commits)
  ARM: spear: fix typos in comments
  soc/microchip: fix invalid free in mpfs_sys_controller_delete
  soc: s4: Add support for power domains controller
  dt-bindings: power: add Amlogic s4 power domains bindings
  ARM: at91: add support in soc driver for new SAMA5D29
  soc: mediatek: mmsys: add sw0_rst_offset in mmsys driver data
  dt-bindings: memory: renesas,rpc-if: Document RZ/V2L SoC
  memory: emif: check the pointer temp in get_device_details()
  memory: emif: Add check for setup_interrupts
  dt-bindings: arm: mediatek: mmsys: add support for MT8186
  dt-bindings: mediatek: add compatible for MT8186 pwrap
  soc: mediatek: pwrap: add pwrap driver for MT8186 SoC
  soc: mediatek: mmsys: add mmsys reset control for MT8186
  soc: mediatek: mtk-infracfg: Disable ACP on MT8192
  soc: ti: k3-socinfo: Add AM62x JTAG ID
  soc: mediatek: add MTK mutex support for MT8186
  soc: mediatek: mmsys: add mt8186 mmsys routing table
  soc: mediatek: pm-domains: Add support for mt8186
  dt-bindings: power: Add MT8186 power domains
  soc: mediatek: pm-domains: Add support for mt8195
  ...

Pull ARM SoC updates from Arnd Bergmann:
 "SoC specific code is generally used for older platforms that don't
  (yet) use device tree to do the same things.

   - Support is added for i.MXRT10xx, a Cortex-M7 based microcontroller
     from NXP. At the moment this is still incomplete as other portions
     are merged through different trees.

   - Long abandoned support for running NOMMU ARMv4 or ARMv5 platforms
     gets removed, now the Arm NOMMU platforms are limited to the
     Cortex-M family of microcontrollers

   - Two old PXA boards get removed, along with corresponding driver
     bits.

   - Continued cleanup of the Intel IXP4xx platforms, removing some
     remnants of the old board files.

   - Minor Cleanups and fixes for Orion, PXA, MMP, Mstar, Samsung

   - CPU idle support for AT91

   - A system controller driver for Polarfire"

* tag 'arm-soc-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (29 commits)
  ARM: remove support for NOMMU ARMv4/v5
  ARM: PXA: fix up decompressor code
  soc: microchip: make mpfs_sys_controller_put static
  ARM: pxa: remove Intel Imote2 and Stargate 2 boards
  ARM: mmp: Fix failure to remove sram device
  ARM: mstar: Select ARM_ERRATA_814220
  soc: add microchip polarfire soc system controller
  ARM: at91: Kconfig: select PM_OPP
  ARM: at91: PM: add cpu idle support for sama7g5
  ARM: at91: ddr: fix typo to align with datasheet naming
  ARM: at91: ddr: align macro definitions
  ARM: at91: ddr: remove CONFIG_SOC_SAMA7 dependency
  ARM: ixp4xx: Convert to SPARSE_IRQ and P2V
  ARM: ixp4xx: Drop all common code
  ARM: ixp4xx: Drop custom DMA coherency and bouncing
  ARM: ixp4xx: Remove feature bit accessors
  net: ixp4xx_hss: Check features using syscon
  net: ixp4xx_eth: Drop platform data support
  soc: ixp4xx-npe: Access syscon regs using regmap
  soc: ixp4xx: Add features from regmap helper
  ...

Pull ARM defconfig updates from Arnd Bergmann:
 "Various updates for the 32-bit and 64-bit defconfig files, mostly to
  enable additional hardware drivers for more machines, specifically for
  the Allwinner F1C100, Altera SoCFPGA, Broadcom, Microchip, Qualcomm,
  Airoha, Tegra, Renesas, and i.NX.

  The multi_v5_defconfig for older ARMv5 configs gets a rework for Andre
  Przywara to cleans up the multi_v5_defconfig for some cruft that has
  accumulated and drivers that got disabled unintentionally, while
  Anders Roxell makes it more useful for running under Qemu"

* tag 'arm-defconfig-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (41 commits)
  ARM: configs: multi_v5: Enable Allwinner F1C100
  ARM: configs: clean up multi_v5_defconfig
  ARM: configs: multi_v5_defconfig: re-enable DRM_PANEL and FB_xxx
  ARM: configs: multi_v5_defconfig: re-enable CONFIG_V4L_PLATFORM_DRIVERS
  ARM: configs: multi_v5_defconfig: remove deleted platforms
  ARM: defconfig: add SMB347 charger driver for p4note
  arm: multi_v5: enable configs for versatile
  arm64: defconfig: enable Layerscape SFP driver
  ARM: configs: at91: sama7: Unselect CONFIG_DMATEST
  ARM: configs: at91: add eic
  arm64: defconfig: enable the CVP driver
  ARM: multi_v7_defconfig: Add support for Airoha EN7523 SoC
  ARM: multi_v7_defconfig: Enable BCM23550 and BCM53573
  ARM: multi_v7_defconfig: Enable Broadcom STB USB drivers
  ARM: configs: at91: sama7: add config for cpufreq
  ARM: configs: at91: sama7: enable cpu idle
  ARM: configs: at91: sama7: Enable crypto IPs and software algs
  ARM: configs: at91: sama7: Enable UBIFS_FS
  ARM: configs: at91: sama7: Enable NAND / SMC
  arm64: defconfig: tegra: Enable GPCDMA
  ...

Pull asm-generic updates from Arnd Bergmann:
 "There are three sets of updates for 5.18 in the asm-generic tree:

   - The set_fs()/get_fs() infrastructure gets removed for good.

     This was already gone from all major architectures, but now we can
     finally remove it everywhere, which loses some particularly tricky
     and error-prone code. There is a small merge conflict against a
     parisc cleanup, the solution is to use their new version.

   - The nds32 architecture ends its tenure in the Linux kernel.

     The hardware is still used and the code is in reasonable shape, but
     the mainline port is not actively maintained any more, as all
     remaining users are thought to run vendor kernels that would never
     be updated to a future release.

   - A series from Masahiro Yamada cleans up some of the uapi header
     files to pass the compile-time checks"

* tag 'asm-generic-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (27 commits)
  nds32: Remove the architecture
  uaccess: remove CONFIG_SET_FS
  ia64: remove CONFIG_SET_FS support
  sh: remove CONFIG_SET_FS support
  sparc64: remove CONFIG_SET_FS support
  lib/test_lockup: fix kernel pointer check for separate address spaces
  uaccess: generalize access_ok()
  uaccess: fix type mismatch warnings from access_ok()
  arm64: simplify access_ok()
  m68k: fix access_ok for coldfire
  MIPS: use simpler access_ok()
  MIPS: Handle address errors for accesses above CPU max virtual user address
  uaccess: add generic __{get,put}_kernel_nofault
  nios2: drop access_ok() check from __put_user()
  x86: use more conventional access_ok() definition
  x86: remove __range_not_ok()
  sparc64: add __{get,put}_kernel_nofault()
  nds32: fix access_ok() checks in get/put_user
  uaccess: fix nios2 and microblaze get_user_8()
  sparc64: fix building assembly files
  ...

Pull ARM updates from Russell King:
 "Updates for IRQ stacks and virtually mapped stack support, and ftrace:

   - Support for IRQ and vmap'ed stacks

     This covers all the work related to implementing IRQ stacks and
     vmap'ed stacks for all 32-bit ARM systems that are currently
     supported by the Linux kernel, including RiscPC and Footbridge. It
     has been submitted for review in four different waves:

      - IRQ stacks support for v7 SMP systems [0]

      - vmap'ed stacks support for v7 SMP systems[1]

      - extending support for both IRQ stacks and vmap'ed stacks for all
        remaining configurations, including v6/v7 SMP multiplatform
        kernels and uniprocessor configurations including v7-M [2]

      - fixes and updates in [3]

   - ftrace fixes and cleanups

     Make all flavors of ftrace available on all builds, regardless of
     ISA choice, unwinder choice or compiler [4]:

      - use ADD not POP where possible

      - fix a couple of Thumb2 related issues

      - enable HAVE_FUNCTION_GRAPH_FP_TEST for robustness

      - enable the graph tracer with the EABI unwinder

      - avoid clobbering frame pointer registers to make Clang happy

   - Fixes for the above"

[0] https://lore.kernel.org/linux-arm-kernel/20211115084732.3704393-1-ardb@kernel.org/
[1] https://lore.kernel.org/linux-arm-kernel/20211122092816.2865873-1-ardb@kernel.org/
[2] https://lore.kernel.org/linux-arm-kernel/20211206164659.1495084-1-ardb@kernel.org/
[3] https://lore.kernel.org/linux-arm-kernel/20220124174744.1054712-1-ardb@kernel.org/
[4] https://lore.kernel.org/linux-arm-kernel/20220203082204.1176734-1-ardb@kernel.org/

* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: (62 commits)
  ARM: fix building NOMMU ARMv4/v5 kernels
  ARM: unwind: only permit stack switch when unwinding call_with_stack()
  ARM: Revert "unwind: dump exception stack from calling frame"
  ARM: entry: fix unwinder problems caused by IRQ stacks
  ARM: unwind: set frame.pc correctly for current-thread unwinding
  ARM: 9184/1: return_address: disable again for CONFIG_ARM_UNWIND=y
  ARM: 9183/1: unwind: avoid spurious warnings on bogus code addresses
  Revert "ARM: 9144/1: forbid ftrace with clang and thumb2_kernel"
  ARM: mach-bcm: disable ftrace in SMC invocation routines
  ARM: cacheflush: avoid clobbering the frame pointer
  ARM: kprobes: treat R7 as the frame pointer register in Thumb2 builds
  ARM: ftrace: enable the graph tracer with the EABI unwinder
  ARM: unwind: track location of LR value in stack frame
  ARM: ftrace: enable HAVE_FUNCTION_GRAPH_FP_TEST
  ARM: ftrace: avoid unnecessary literal loads
  ARM: ftrace: avoid redundant loads or clobbering IP
  ARM: ftrace: use trampolines to keep .init.text in branching range
  ARM: ftrace: use ADD not POP to counter PUSH at entry
  ARM: ftrace: ensure that ADR takes the Thumb bit into account
  ARM: make get_current() and __my_cpu_offset() __always_inline
  ...

Pull m68knommu updates from Greg Ungerer:
 "A few fixes, nothing too exciting.

  Fix warnings when building for dragen2 targets (sparse and
  "screen_bits") and ucsimm targets. Fix compilation problems when test
  compiling for ColdFire targets with the mcf_edma driver enabled.
  Remove an incorrect clock definition for the ColdFire m5441x.

  Summary:

   - fix 'screen_bits' defined but not used

   - fix ucsimm sparse warnings

   - fix dragen2 warnings

   - fix test builds with the mcf_edma driver enabled"

* tag 'm68knommu-for-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu:
  m68k: coldfire/device.c: only build for MCF_EDMA when h/w macros are defined
  m68k: m5441x: remove erroneous clock disable
  m68knommu: fix ucsimm sparse warnings
  m68knommu: fix 'screen_bits' defined but not used
  m68knommu: fix warning: no previous prototype for 'init_dragen2'

Pull sound updates from Takashi Iwai:
 "It's been a fairly calm development cycle. There are a few last-minute
  ALSA core fixes, most notably for covering PCM ioctl races, but the
  most of rest are device-specific changes.

  Below are some highlights:

  ALSA core:

   - Fixes for PCM ioctl races that may lead to UAF

   - Fix for oversized allocations in PCM OSS layer

  ASoC:

   - Start of moving SoF to support multiple IPC mechanisms

   - Use of NHLT ACPI table to reduce the amount of quirking required
     for Intel systems

   - Preliminary works forthcoming Intel AVS driver for legacy Intel DSP
     firmwares

   - Support for AMD PDM, Atmel PDMC, Awinic AW8738, i.MX cards with
     TLV320AIC31xx, Intel machines with CS35L41 and ESSX8336, Mediatek
     MT8181 wideband bluetooth, nVidia Tegra234, Qualcomm SC7280,
     Renesas RZ/V2L, Texas Instruments TAS585M

  HD-audio:

   - Driver re-binding fix for HD-audio

   - Updates for Intel ADL and Tegra234, various platform quirks for
     Dell, HP, Lenovo, ASUS, Samsung and Clevo machines

  USB-audio:

   - Quirk updates for Scarlett2, RODE, Corsair devices"

* tag 'sound-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (486 commits)
  ALSA: hda/realtek: Add alc256-samsung-headphone fixup
  ALSA: pci: fix reading of swapped values from pcmreg in AC97 codec
  ALSA: pcm: Add stream lock during PCM reset ioctl operations
  ALSA: pcm: Fix races among concurrent prealloc proc writes
  ALSA: pcm: Fix races among concurrent prepare and hw_params/hw_free calls
  ALSA: pcm: Fix races among concurrent read/write and buffer changes
  ALSA: pcm: Fix races among concurrent hw_params and hw_free calls
  ASoC: atmel: mchp-pdmc: print the correct property name
  MAINTAINERS: Add Shengjiu to maintainer list of sound/soc/fsl
  ASoC: SOF: Add a new dai_get_clk topology IPC op
  ASoC: SOF: topology: Add ops for setting up and tearing down pipelines
  ASoC: SOF: expose sof_route_setup()
  ASoC: SOF: Add dai_link_fixup PCM op for IPC3
  ASoC: SOF: Add trigger PCM op for IPC3
  ASoC: SOF: Define hw_params PCM op for IPC3
  ASoC: SOF: Introduce IPC3 PCM hw_free op
  ASoC: SOF: pcm: expose the sof_pcm_setup_connected_widgets() function
  ASoC: SOF: Introduce IPC-specific PCM ops
  ASoC: SOF: Add bytes_ext control IPC ops for IPC3
  ASoC: SOF: Add bytes_get/put control IPC ops for IPC3
  ...

Pull media updates from Mauro Carvalho Chehab:

 - a major reorg at platform Kconfig/Makefile files, organizing them per
   vendor. The other media Kconfig/Makefile files also sorted

 - New sensor drivers: hi847, isl7998x, ov08d10

 - New Amphion vpu decoder stateful driver

 - New Atmel microchip csi2dc driver

 - tegra-vde driver promoted from staging

 - atomisp: some fixes for it to work on BYT

 - imx7-mipi-csis driver promoted from staging and renamed

 - camss driver got initial support for VFE hardware version Titan 480

 - mtk-vcodec has gained support for MT8192

 - lots of driver changes, fixes and improvements

* tag 'media/v5.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (417 commits)
  media: nxp: Restrict VIDEO_IMX_MIPI_CSIS to ARCH_MXC or COMPILE_TEST
  media: amphion: cleanup media device if register it fail
  media: amphion: fix some issues to improve robust
  media: amphion: fix some error related with undefined reference to __divdi3
  media: amphion: fix an issue that using pm_runtime_get_sync incorrectly
  media: vidtv: use vfree() for memory allocated with vzalloc()
  media: m5mols/m5mols.h: document new reset field
  media: pixfmt-yuv-planar.rst: fix PIX_FMT labels
  media: platform: Remove unnecessary print function dev_err()
  media: amphion: Add missing of_node_put() in vpu_core_parse_dt()
  media: mtk-vcodec: Add missing of_node_put() in mtk_vdec_hw_prob_done()
  media: platform: amphion: Fix build error without MAILBOX
  media: spi: Kconfig: Place SPI drivers on a single menu
  media: i2c: Kconfig: move camera drivers to the top
  media: atomisp: fix bad usage at error handling logic
  media: platform: rename mediatek/mtk-jpeg/ to mediatek/jpeg/
  media: media/*/Kconfig: sort entries
  media: Kconfig: cleanup VIDEO_DEV dependencies
  media: platform/*/Kconfig: make manufacturer menus more uniform
  media: platform: Create vendor/{Makefile,Kconfig} files
  ...

Pull fbdev updates from Helge Deller:
 "Lots of small fixes and code cleanups across most of the fbdev
  drivers.

  This includes conversions to use helper functions, const conversions,
  spelling fixes, help text updates, adding return value checks, small
  build fixes, and much more"

* tag 'for-5.18/fbdev-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev: (59 commits)
  video: fbdev: kyro: make read-only array ODValues static const
  video: fbdev: offb: fix warning comparing pointer to 0
  video: fbdev: omapfb: Add missing of_node_put() in dvic_probe_of
  video: fbdev: sm712fb: Fix crash in smtcfb_write()
  video: fbdev: s3c-fb: fix platform_get_irq.cocci warning
  video: fbdev: sm712fb: Fix crash in smtcfb_read()
  video: fbdev: via: check the return value of kstrdup()
  video: fbdev: au1100fb: Spelling s/palette/palette/
  video: fbdev: atari: Atari 2 bpp (STe) palette bugfix
  video: fbdev: atari: Remove unused atafb_setcolreg()
  video: fbdev: atari: Convert to standard round_up() helper
  video: fbdev: atari: Fix TT High video mode
  video: fbdev: udlfb: replace snprintf in show functions with sysfs_emit
  video: fbdev: omapfb: panel-tpo-td043mtea1: Use sysfs_emit() instead of snprintf()
  video: fbdev: omapfb: panel-dsi-cm: Use sysfs_emit() instead of snprintf()
  video: fbdev: omapfb: Use sysfs_emit() instead of snprintf()
  video: fbdev: s3c-fb: Use platform_get_irq() to get the interrupt
  video: fbdev: Fix wrong file path for pvr2fb.c in Kconfig help text
  video: fbdev: pxa3xx-gcu: Remove unnecessary print function dev_err()
  video: fbdev: pxa168fb: Remove unnecessary print function dev_err()
  ...

Pull MMC updates from Ulf Hansson:
 "MMC core:
   - Convert to sysfs_emit() in favor of sprintf()

   - Improve fallback to speed modes if eMMC HS200 fails

  MMC host:
   - dw_mmc: Allow variants to set minimal supported clock rate

   - dw-mmc-rockchip: Fix problems with invalid clock rates

   - litex_mmc: Add new DT based driver for the LiteX's LiteSDCard
     interface

   - litex_mmc: Add Gabriel Somlo and Joel Stanley as co-maintainers for
     LiteX

   - mtk-sd: Add support for the Mediatek MT8186 variant

   - renesas_sdhi: Add support for RZ/G2UL variant

   - renesas_sdhi: Add support for RZ/V2L variant

   - rtsx_pci: Adjust power-on sequence to conform to the SD spec

   - sdhci-am654: Add support for TI's AM62 variant

   - sdhci_am654: Fixup support for TI's AM64 variant

   - sdhci-esdhc-imx: Add support for the imx93 variant

   - sdhci-msm: Add support for the msm8953 variant

   - sdhci-pci-gli: Add support for runtime PM for the GL9763E variant

   - sdhci-pci-gli: Adjustments of the SSC function for the GL975x
     variants

   - sdhci-tegra: Add support for wake on SD card event

   - sunxi-mmc: Add support for Allwinner's F1c100s variant

   - sunxi-mmc: Add support for D1 MMC variant"

* tag 'mmc-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: (37 commits)
  dt-bindings: mmc: renesas,sdhi: Document RZ/G2UL SoC
  mmc: tmio: remove outdated members from host struct
  mmc: mtk-sd: Silence delay phase calculation debug log
  mmc: davinci_mmc: Handle error for clk_enable
  mmc: sdhci-pci-gli: Add runtime PM for GL9763E
  mmc: core: Drop HS400 caps unless 8-bit bus is supported too
  mmc: host: Return an error when ->enable_sdio_irq() ops is missing
  mmc: core: Improve fallback to speed modes if eMMC HS200 fails
  dt-bindings: mmc: sunxi: add Allwinner F1c100s compatible
  mmc: dw-mmc-rockchip: Fix handling invalid clock rates
  mmc: dw_mmc: Support setting f_min from host drivers
  mmc: host: Drop commas after SoC match table sentinels
  mmc: rtsx: add 74 Clocks in power on flow
  dt-bindings: mmc: renesas,sdhi: Document RZ/V2L SoC
  mmc: sh_mmcif: Simplify division/shift logic
  mmc: sdhci_am654: Add Support for TI's AM62 SoC
  dt-bindings: mmc: imx-esdhc: Add imx93 compatible string
  dt-bindings: mmc: sdhci-am654: Add compatible string for AM62 SoC
  mmc: sdhci_am654: Fix the driver data of AM64 SoC
  mmc: core: use sysfs_emit() instead of sprintf()
  ...

Pull ata updates from Damien Le Moal:
 "For this cycle, no big change but many small fixes and code cleanup to
  libata, the ahci driver and various pata drivers. In more details:

   - Code simplification in pata_platform using
     platform_get_mem_or_io(), from Lad.

   - Fix read-only arrays declarations as const in pata_atiixp and
     pata_pdc202xx_old, from Colin.

   - Various cleanups and code simplification in libata-scsi, from me.

   - Remove dead code in libata-acpi, from Sergey.

   - Skip device scan deboune delay for Marvell 88SE9235 adapters (ahci)
     to speedup boot, from Paul.

   - Simplify functions declaration and use for functions always
     returning 0 in libata-core, from Sergey.

   - Non-fatal error fixes and in the pata_hpt366 and pata_hpt3x2n
     drivers, from Sergey.

   - Various code cleanup in the pata_artop, pata_hpt37x, pata_hpt366,
     pata_hpt3x2n, pata_samsung_cf and sata_rcar drivers, from Sergey.

   - Some libata-sff and libata-scsi code cleanup (e.g. change functions
     to return "bool"), from Sergey.

   - Renae ahci_board_mobile to board_ahci_low_power to be more
     descriptive of the feature as that is also used on PC and server
     AHCI adapters, from Mario.

   - Cleanup of OF match tables, from Geert.

   - Simplify the pata_pxa driver initialization using
     platform_get_irq(), from Minghao"

* tag 'ata-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata: (38 commits)
  ata: pata_pxa: Use platform_get_irq() to get the interrupt
  ata: Drop commas after OF match table sentinels
  ata: ahci: Rename CONFIG_SATA_LPM_MOBILE_POLICY configuration item
  ata: ahci: Rename `AHCI_HFLAG_IS_MOBILE`
  ata: ahci: Rename board_ahci_mobile
  ata: pata_hpt37x: merge transfer mode setting methods
  ata: libata-sff: use *switch* statement in ata_sff_dev_classify()
  ata: add/use ata_taskfile::{error|status} fields
  ata: Kconfig: fix sata gemini compile test condition
  ata: libata-scsi: use *switch* statements to check SCSI command codes
  ata: libata-sff: refactor ata_sff_altstatus()
  ata: libata-sff: refactor ata_sff_set_devctl()
  ata: libata-sff: make ata_resources_present() return 'bool'
  ata: pata_hpt3x2n: disable fast interrupts in prereset() method
  ata: pata_hpt37x: disable fast interrupts in prereset() method
  ata: pata_hpt366: disable fast interrupts in prereset() method
  ata: pata_mpc52xx: use GFP_KERNEL
  ata: sata_rcar: drop unused #define's
  ata: pata_hpt366: check channel enable bits
  ata: sata_rcar: make sata_rcar_ata_devchk() return 'bool'
  ...

Merge tag 'linux-kselftest-kunit-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull KUnit updates from Shuah Khan:

 - changes to decrease macro layering string, integer, EQ/NE asserts

 - remove unused macros

 - several cleanups and fixes

 - new list tests for list_del_init_careful(), list_is_head() and
   list_entry_is_head()

* tag 'linux-kselftest-kunit-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  list: test: Add a test for list_entry_is_head()
  list: test: Add a test for list_is_head()
  list: test: Add test for list_del_init_careful()
  kunit: cleanup assertion macro internal variables
  kunit: factor out str constants from binary assertion structs
  kunit: consolidate KUNIT_INIT_BINARY_ASSERT_STRUCT macros
  kunit: remove va_format from kunit_assert
  kunit: tool: drop mostly unused KunitResult.result field
  kunit: decrease macro layering for EQ/NE asserts
  kunit: decrease macro layering for integer asserts
  kunit: reduce layering in string assertion macros
  kunit: drop unused intermediate macros for ptr inequality checks
  kunit: make KUNIT_EXPECT_EQ() use KUNIT_EXPECT_EQ_MSG(), etc.
  kunit: drop unused assert_type from kunit_assert and clean up macros
  kunit: split out part of kunit_assert into a static const
  kunit: factor out kunit_base_assert_format() call into kunit_fail()
  kunit: drop unused kunit* field in kunit_assert
  kunit: move check if assertion passed into the macros
  kunit: add example test case showing off all the expect macros

Merge tag 'linux-kselftest-next-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull Kselftest updates from Shuah Khan:
 "Several build and cleanup fixes:

   - removing obsolete config options

   - removing dependency on internal kernel macros

   - adding config options

   - several build fixes related to headers and install paths"

* tag 'linux-kselftest-next-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (22 commits)
  selftests: Fix build when $(O) points to a relative path
  selftests: netfilter: fix a build error on openSUSE
  selftests: kvm: add generated file to the .gitignore
  selftests/exec: add generated files to .gitignore
  selftests: add kselftest_install to .gitignore
  selftests/rtc: continuously read RTC in a loop for 30s
  selftests/lkdtm: Add UBSAN config
  selftests/lkdtm: Remove dead config option
  selftests/exec: Rename file binfmt_script to binfmt_script.py
  selftests: Use -isystem instead of -I to include headers
  selftests: vm: remove dependecy from internal kernel macros
  selftests: vm: Add the uapi headers include variable
  selftests: mptcp: Add the uapi headers include variable
  selftests: net: Add the uapi headers include variable
  selftests: landlock: Add the uapi headers include variable
  selftests: kvm: Add the uapi headers include variable
  selftests: futex: Add the uapi headers include variable
  selftests: Correct the headers install path
  selftests: Add and export a kernel uapi headers path
  selftests: set the BUILD variable to absolute path
  ...

Pull cgroup updates from Tejun Heo:
 "All trivial cleanups without meaningful behavior changes"

* 'for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: cleanup comments
  cgroup: Fix cgroup_can_fork() and cgroup_post_fork() kernel-doc comment
  cgroup: rstat: retrieve current bstat to delta directly
  cgroup: rstat: use same convention to assign cgroup_base_stat

Pull workqueue updates from Tejun Heo:
 "Nothing major. Just follow-up cleanups from Lai after the earlier
  synchronization simplification"

* 'for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: Convert the type of pool->nr_running to int
  workqueue: Use wake_up_worker() in wq_worker_sleeping() instead of open code
  workqueue: Change the comments of the synchronization about the idle_list
  workqueue: Remove the mb() pair between wq_worker_sleeping() and insert_work()

Pull slab updates from Vlastimil Babka:

 - A few non-trivial SLUB code cleanups, most notably a refactoring of
   deactivate_slab().

 - A bunch of trivial changes, such as removal of unused parameters,
   making stuff static, and employing helper functions.

* tag 'slab-for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
  mm: slub: Delete useless parameter of alloc_slab_page()
  mm: slab: Delete unused SLAB_DEACTIVATED flag
  mm/slub: remove forced_order parameter in calculate_sizes
  mm/slub: refactor deactivate_slab()
  mm/slub: limit number of node partial slabs only in cache creation
  mm/slub: use helper macro __ATTR_XX_MODE for SLAB_ATTR(_RO)
  mm/slab_common: use helper function is_power_of_2()
  mm/slob: make kmem_cache_boot static

Pull tracing updates from Steven Rostedt:

 - New user_events interface. User space can register an event with the
   kernel describing the format of the event. Then it will receive a
   byte in a page mapping that it can check against. A privileged task
   can then enable that event like any other event, which will change
   the mapped byte to true, telling the user space application to start
   writing the event to the tracing buffer.

 - Add new "ftrace_boot_snapshot" kernel command line parameter. When
   set, the tracing buffer will be saved in the snapshot buffer at boot
   up when the kernel hands things over to user space. This will keep
   the traces that happened at boot up available even if user space boot
   up has tracing as well.

 - Have TRACE_EVENT_ENUM() also update trace event field type
   descriptions. Thus if a static array defines its size with an enum,
   the user space trace event parsers can still know how to parse that
   array.

 - Add new TRACE_CUSTOM_EVENT() macro. This acts the same as the
   TRACE_EVENT() macro, but will attach to an existing tracepoint. This
   will make one tracepoint be able to trace different content and not
   be stuck at only what the original TRACE_EVENT() macro exports.

 - Fixes to tracing error logging.

 - Better saving of cmdlines to PIDs when tracing (use the wakeup events
   for mapping).

* tag 'trace-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (30 commits)
  tracing: Have type enum modifications copy the strings
  user_events: Add trace event call as root for low permission cases
  tracing/user_events: Use alloc_pages instead of kzalloc() for register pages
  tracing: Add snapshot at end of kernel boot up
  tracing: Have TRACE_DEFINE_ENUM affect trace event types as well
  tracing: Fix strncpy warning in trace_events_synth.c
  user_events: Prevent dyn_event delete racing with ioctl add/delete
  tracing: Add TRACE_CUSTOM_EVENT() macro
  tracing: Move the defines to create TRACE_EVENTS into their own files
  tracing: Add sample code for custom trace events
  tracing: Allow custom events to be added to the tracefs directory
  tracing: Fix last_cmd_set() string management in histogram code
  user_events: Fix potential uninitialized pointer while parsing field
  tracing: Fix allocation of last_cmd in last_cmd_set()
  user_events: Add documentation file
  user_events: Add sample code for typical usage
  user_events: Add self-test for validator boundaries
  user_events: Add self-test for perf_event integration
  user_events: Add self-test for dynamic_events integration
  user_events: Add self-test for ftrace integration
  ...

Pull RTLA tracing tool updates from Steven Rostedt:
 "Real Time Analysis Tool updatesfor 5.18:

   - Support for adjusting tracing_threashold

   - Add -a (auto) option to make it easier for users to debug in the field

   - Add -e option to add more events to the trace

   - Add --trigger option to add triggers to events

   - Add --filter option to filter events

   - Add support to save histograms to the file

   - Add --dma-latency to set /dev/cpu_dma_latency

   - Other fixes and cleanups"

* tag 'trace-rtla-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  rtla: Tools main loop cleanup
  rtla/timerlat: Add --dma-latency option
  rtla/osnoise: Fix osnoise hist stop tracing message
  rtla: Check for trace off also in the trace instance
  rtla/trace: Save event histogram output to a file
  rtla: Add --filter support
  rtla/trace: Add trace event filter helpers
  rtla: Add --trigger support
  rtla/trace: Add trace event trigger helpers
  rtla: Add -e/--event support
  rtla/trace: Add trace events helpers
  rtla/timerlat: Add the automatic trace option
  rtla/osnoise: Add the automatic trace option
  rtla/osnoise: Add an option to set the threshold
  rtla/osnoise: Add support to adjust the tracing_thresh

Pull printk updates from Petr Mladek:

 - Make %pK behave the same as %p for kptr_restrict == 0 also with
   no_hash_pointers parameter

 - Ignore the default console in the device tree also when console=null
   or console="" is used on the command line

 - Document console=null and console="" behavior

 - Prevent a deadlock and a livelock caused by console_lock in panic()

 - Make console_lock available for panicking CPU

 - Fast query for the next to-be-used sequence number

 - Use the expected return values in printk.devkmsg __setup handler

 - Use the correct atomic operations in wake_up_klogd() irq_work handler

 - Avoid possible unaligned access when handling %4cc printing format

* tag 'printk-for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printk: fix return value of printk.devkmsg __setup handler
  vsprintf: Fix %pK with kptr_restrict == 0
  printk: make suppress_panic_printk static
  printk: Set console_set_on_cmdline=1 when __add_preferred_console() is called with user_specified == true
  Docs: printk: add 'console=null|""' to admin/kernel-parameters
  printk: use atomic updates for klogd work
  printk: Drop console_sem during panic
  printk: Avoid livelock with heavy printk during panic
  printk: disable optimistic spin during panic
  printk: Add panic_in_progress helper
  vsprintf: Move space out of string literals in fourcc_string()
  vsprintf: Fix potential unaligned access
  printk: ringbuffer: Improve prb_next_seq() performance

The struct folio is not declared in cacheflush.h so we need to provide
a forward declaration as otherwise users of this header file may get
warnings.
Reported-by: Guenter Roeck <linux@roeck-us.net>
Fixes: 522a0032 ("Add linux/cacheflush.h")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The Kconfig symbols required for the Allwinner F1C100 (MACH_SUNIV) are
currently not selected by any defconfig. sunxi_defconfig only covers the
v7 SoCs, but the F1C100s is ARMv5, so we cannot share a single image.

Add the required symbols to multi_v5_defconfig, to give people some sane
default config when playing around with this chip. This is probably more
important as there are surely not many distros out there supporting
ARMv5 out of the box.

This allows my LicheePi Nano board to boot to a busybox prompt.

The zImage size grows by about 50 KB, in detail:

    text    data     bss     dec     hex   filename
10510000  4400700  687740 15598440 ee0368 vmlinux-old
10588592  4469096  686812 15744500 f03df4 vmlinux-new

14922908			arch/arm/boot/Image-old
15067388			arch/arm/boot/Image-new
6388016				arch/arm/boot/zImage-old
6440064				arch/arm/boot/zImage-new
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Link: https://lore.kernel.org/r/20220317183043.948432-6-andre.przywara@arm.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Pull filesystem folio updates from Matthew Wilcox:
 "Primarily this series converts some of the address_space operations to
  take a folio instead of a page.

  Notably:

   - a_ops->is_partially_uptodate() takes a folio instead of a page and
     changes the type of the 'from' and 'count' arguments to make it
     obvious they're bytes.

   - a_ops->invalidatepage() becomes ->invalidate_folio() and has a
     similar type change.

   - a_ops->launder_page() becomes ->launder_folio()

   - a_ops->set_page_dirty() becomes ->dirty_folio() and adds the
     address_space as an argument.

  There are a couple of other misc changes up front that weren't worth
  separating into their own pull request"

* tag 'folio-5.18b' of git://git.infradead.org/users/willy/pagecache: (53 commits)
  fs: Remove aops ->set_page_dirty
  fb_defio: Use noop_dirty_folio()
  fs: Convert __set_page_dirty_no_writeback to noop_dirty_folio
  fs: Convert __set_page_dirty_buffers to block_dirty_folio
  nilfs: Convert nilfs_set_page_dirty() to nilfs_dirty_folio()
  mm: Convert swap_set_page_dirty() to swap_dirty_folio()
  ubifs: Convert ubifs_set_page_dirty to ubifs_dirty_folio
  f2fs: Convert f2fs_set_node_page_dirty to f2fs_dirty_node_folio
  f2fs: Convert f2fs_set_data_page_dirty to f2fs_dirty_data_folio
  f2fs: Convert f2fs_set_meta_page_dirty to f2fs_dirty_meta_folio
  afs: Convert afs_dir_set_page_dirty() to afs_dir_dirty_folio()
  btrfs: Convert extent_range_redirty_for_io() to use folios
  fs: Convert trivial uses of __set_page_dirty_nobuffers to filemap_dirty_folio
  btrfs: Convert from set_page_dirty to dirty_folio
  fscache: Convert fscache_set_page_dirty() to fscache_dirty_folio()
  fs: Add aops->dirty_folio
  fs: Remove aops->launder_page
  orangefs: Convert launder_page to launder_folio
  nfs: Convert from launder_page to launder_folio
  fuse: Convert from launder_page to launder_folio
  ...

Pull folio updates from Matthew Wilcox:

 - Rewrite how munlock works to massively reduce the contention on
   i_mmap_rwsem (Hugh Dickins):

     https://lore.kernel.org/linux-mm/8e4356d-9622-a7f0-b2c-f116b5f2efea@google.com/

 - Sort out the page refcount mess for ZONE_DEVICE pages (Christoph
   Hellwig):

     https://lore.kernel.org/linux-mm/20220210072828.2930359-1-hch@lst.de/

 - Convert GUP to use folios and make pincount available for order-1
   pages. (Matthew Wilcox)

 - Convert a few more truncation functions to use folios (Matthew
   Wilcox)

 - Convert page_vma_mapped_walk to use PFNs instead of pages (Matthew
   Wilcox)

 - Convert rmap_walk to use folios (Matthew Wilcox)

 - Convert most of shrink_page_list() to use a folio (Matthew Wilcox)

 - Add support for creating large folios in readahead (Matthew Wilcox)

* tag 'folio-5.18c' of git://git.infradead.org/users/willy/pagecache: (114 commits)
  mm/damon: minor cleanup for damon_pa_young
  selftests/vm/transhuge-stress: Support file-backed PMD folios
  mm/filemap: Support VM_HUGEPAGE for file mappings
  mm/readahead: Switch to page_cache_ra_order
  mm/readahead: Align file mappings for non-DAX
  mm/readahead: Add large folio readahead
  mm: Support arbitrary THP sizes
  mm: Make large folios depend on THP
  mm: Fix READ_ONLY_THP warning
  mm/filemap: Allow large folios to be added to the page cache
  mm: Turn can_split_huge_page() into can_split_folio()
  mm/vmscan: Convert pageout() to take a folio
  mm/vmscan: Turn page_check_references() into folio_check_references()
  mm/vmscan: Account large folios correctly
  mm/vmscan: Optimise shrink_page_list for non-PMD-sized folios
  mm/vmscan: Free non-shmem folios without splitting them
  mm/rmap: Constify the rmap_walk_control argument
  mm/rmap: Convert rmap_walk() to take a folio
  mm: Turn page_anon_vma() into folio_anon_vma()
  mm/rmap: Turn page_lock_anon_vma_read() into folio_lock_anon_vma_read()
  ...

Merge updates from Andrew Morton:

 - A few misc subsystems: kthread, scripts, ntfs, ocfs2, block, and vfs

 - Most the MM patches which precede the patches in Willy's tree: kasan,
   pagecache, gup, swap, shmem, memcg, selftests, pagemap, mremap,
   sparsemem, vmalloc, pagealloc, memory-failure, mlock, hugetlb,
   userfaultfd, vmscan, compaction, mempolicy, oom-kill, migration, thp,
   cma, autonuma, psi, ksm, page-poison, madvise, memory-hotplug, rmap,
   zswap, uaccess, ioremap, highmem, cleanups, kfence, hmm, and damon.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (227 commits)
  mm/damon/sysfs: remove repeat container_of() in damon_sysfs_kdamond_release()
  Docs/ABI/testing: add DAMON sysfs interface ABI document
  Docs/admin-guide/mm/damon/usage: document DAMON sysfs interface
  selftests/damon: add a test for DAMON sysfs interface
  mm/damon/sysfs: support DAMOS stats
  mm/damon/sysfs: support DAMOS watermarks
  mm/damon/sysfs: support schemes prioritization
  mm/damon/sysfs: support DAMOS quotas
  mm/damon/sysfs: support DAMON-based Operation Schemes
  mm/damon/sysfs: support the physical address space monitoring
  mm/damon/sysfs: link DAMON for virtual address spaces monitoring
  mm/damon: implement a minimal stub for sysfs-based DAMON interface
  mm/damon/core: add number of each enum type values
  mm/damon/core: allow non-exclusive DAMON start/stop
  Docs/damon: update outdated term 'regions update interval'
  Docs/vm/damon/design: update DAMON-Idle Page Tracking interference handling
  Docs/vm/damon: call low level monitoring primitives the operations
  mm/damon: remove unnecessary CONFIG_DAMON option
  mm/damon/paddr,vaddr: remove damon_{p,v}a_{target_valid,set_operations}()
  mm/damon/dbgfs-test: fix is_target_id() change
  ...

In damon_sysfs_kdamond_release(), we have use container_of() to get
"kdamond" pointer, so there no need to get it once again.

Link: https://lkml.kernel.org/r/20220303075314.22502-1-xhao@linux.alibaba.comSigned-off-by: Xin Hao <xhao@linux.alibaba.com>
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>

This commit adds DAMON sysfs interface ABI document under
Documentation/ABI/testing.

Link: https://lkml.kernel.org/r/20220228081314.5770-14-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit adds detailed usage of DAMON sysfs interface in the
admin-guide document for DAMON.

Link: https://lkml.kernel.org/r/20220228081314.5770-13-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit adds a selftest for DAMON sysfs interface.  It tests the
functionality of 'nr' files and existence of files in each directory of
the hierarchy.

Link: https://lkml.kernel.org/r/20220228081314.5770-12-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit makes DAMON sysfs interface supports the DAMOS stats feature.
Specifically, this commit adds 'stats' directory under each scheme
directory, and update the contents of the files under the directory
according to the latest monitoring results, when the user writes special
keyword, 'update_schemes_stats' to the 'state' file of the kdamond.

As a result, the files hierarchy becomes as below:

    /sys/kernel/mm/damon/admin
    │ kdamonds/nr_kdamonds
    │ │ 0/state,pid
    │ │ │ contexts/nr_contexts
    │ │ │ │ 0/operations
    │ │ │ │ │ monitoring_attrs/intervals/sample_us,aggr_us,update_us
    │ │ │ │ │ │ nr_regions/min,max
    │ │ │ │ │ targets/nr_targets
    │ │ │ │ │ │ 0/pid_target
    │ │ │ │ │ │ │ regions/nr_regions
    │ │ │ │ │ │ │ │ 0/start,end
    │ │ │ │ │ │ │ │ ...
    │ │ │ │ │ │ ...
    │ │ │ │ │ schemes/nr_schemes
    │ │ │ │ │ │ 0/action
    │ │ │ │ │ │ │ access_pattern/
    │ │ │ │ │ │ │ │ sz/min,max
    │ │ │ │ │ │ │ │ nr_accesses/min,max
    │ │ │ │ │ │ │ │ age/min,max
    │ │ │ │ │ │ │ quotas/ms,sz,reset_interval_ms
    │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil
    │ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low
    │ │ │ │ │ │ │ stats/    <- NEW DIRECTORY
    │ │ │ │ │ │ │ │ nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds
    │ │ │ │ │ │ ...
    │ │ │ │ ...
    │ │ ...

Link: https://lkml.kernel.org/r/20220228081314.5770-11-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit makes DAMON sysfs interface supports the DAMOS watermarks
feature.  Specifically, this commit adds 'watermarks' directory under each
scheme directory and makes kdamond 'state' file writing respects the
contents in the directory.

As a result, the files hierarchy becomes as below:

    /sys/kernel/mm/damon/admin
    │ kdamonds/nr_kdamonds
    │ │ 0/state,pid
    │ │ │ contexts/nr_contexts
    │ │ │ │ 0/operations
    │ │ │ │ │ monitoring_attrs/intervals/sample_us,aggr_us,update_us
    │ │ │ │ │ │ nr_regions/min,max
    │ │ │ │ │ targets/nr_targets
    │ │ │ │ │ │ 0/pid_target
    │ │ │ │ │ │ │ regions/nr_regions
    │ │ │ │ │ │ │ │ 0/start,end
    │ │ │ │ │ │ │ │ ...
    │ │ │ │ │ │ ...
    │ │ │ │ │ schemes/nr_schemes
    │ │ │ │ │ │ 0/action
    │ │ │ │ │ │ │ access_pattern/
    │ │ │ │ │ │ │ │ sz/min,max
    │ │ │ │ │ │ │ │ nr_accesses/min,max
    │ │ │ │ │ │ │ │ age/min,max
    │ │ │ │ │ │ │ quotas/ms,sz,reset_interval_ms
    │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil
    │ │ │ │ │ │ │ watermarks/    <- NEW DIRECTORY
    │ │ │ │ │ │ │ │ metric,interval_us,high,mid,lo
    │ │ │ │ │ │ ...
    │ │ │ │ ...
    │ │ ...

[sj@kernel.org: fix out-of-bound array access for wmark_metric_strs[]]
  Link: https://lkml.kernel.org/r/20220301185619.2904-1-sj@kernel.org

Link: https://lkml.kernel.org/r/20220228081314.5770-10-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit makes DAMON sysfs interface supports the DAMOS' regions
prioritization weights feature under quotas limitation.  Specifically,
this commit adds 'weights' directory under each scheme directory and makes
kdamond 'state' file writing respects the contents in the directory.

    /sys/kernel/mm/damon/admin
    │ kdamonds/nr
    │ │ 0/state,pid
    │ │ │ contexts/nr
    │ │ │ │ 0/operations
    │ │ │ │ │ monitoring_attrs/intervals/sample_us,aggr_us,update_us
    │ │ │ │ │ │ nr_regions/min,max
    │ │ │ │ │ targets/nr
    │ │ │ │ │ │ 0/pid
    │ │ │ │ │ │ │ regions/nr
    │ │ │ │ │ │ │ │ 0/start,end
    │ │ │ │ │ │ │ │ ...
    │ │ │ │ │ │ ...
    │ │ │ │ │ schemes/nr
    │ │ │ │ │ │ 0/action
    │ │ │ │ │ │ │ access_pattern/
    │ │ │ │ │ │ │ │ sz/min,max
    │ │ │ │ │ │ │ │ nr_accesses/min,max
    │ │ │ │ │ │ │ │ age/min,max
    │ │ │ │ │ │ │ quotas/ms,bytes,reset_interval_ms
    │ │ │ │ │ │ │ │ weights/    <- NEW DIRECTORY
    │ │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil
    │ │ │ │ │ │ ...
    │ │ │ │ ...
    │ │ ...

Link: https://lkml.kernel.org/r/20220228081314.5770-9-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit makes DAMON sysfs interface supports the DAMOS quotas feature.
Specifically, this commit adds 'quotas' directory under each scheme
directory and makes kdamond 'state' file writing respects the contents in
the directory.

As a result, the files hierarchy becomes as below:

    /sys/kernel/mm/damon/admin
    │ kdamonds/nr_kdamonds
    │ │ 0/state,pid
    │ │ │ contexts/nr_contexts
    │ │ │ │ 0/operations
    │ │ │ │ │ monitoring_attrs/intervals/sample_us,aggr_us,update_us
    │ │ │ │ │ │ nr_regions/min,max
    │ │ │ │ │ targets/nr_targets
    │ │ │ │ │ │ 0/pid_target
    │ │ │ │ │ │ │ regions/nr_regions
    │ │ │ │ │ │ │ │ 0/start,end
    │ │ │ │ │ │ │ │ ...
    │ │ │ │ │ │ ...
    │ │ │ │ │ schemes/nr_schemes
    │ │ │ │ │ │ 0/action
    │ │ │ │ │ │ │ access_pattern/
    │ │ │ │ │ │ │ │ sz/min,max
    │ │ │ │ │ │ │ │ nr_accesses/min,max
    │ │ │ │ │ │ │ │ age/min,max
    │ │ │ │ │ │ │ quotas/ms,bytes,reset_interval_ms    <- NEW DIRECTORY
    │ │ │ │ │ │ ...
    │ │ │ │ ...
    │ │ ...

Link: https://lkml.kernel.org/r/20220228081314.5770-8-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit makes DAMON sysfs interface supports the DAMON-based operation
schemes (DAMOS) feature.  Specifically, this commit adds 'schemes'
directory under each context direcotry, and makes kdamond 'state' file
writing respects the contents in the directory.

Note that this commit doesn't support all features of DAMOS but only the
target access pattern and action feature.  Supports for quotas,
prioritization, watermarks will follow.

As a result, the files hierarchy becomes as below:

    /sys/kernel/mm/damon/admin
    │ kdamonds/nr_kdamonds
    │ │ 0/state,pid
    │ │ │ contexts/nr_contexts
    │ │ │ │ 0/operations
    │ │ │ │ │ monitoring_attrs/intervals/sample_us,aggr_us,update_us
    │ │ │ │ │ │ nr_regions/min,max
    │ │ │ │ │ targets/nr_targets
    │ │ │ │ │ │ 0/pid_target
    │ │ │ │ │ │ │ regions/nr_regions
    │ │ │ │ │ │ │ │ 0/start,end
    │ │ │ │ │ │ │ │ ...
    │ │ │ │ │ │ ...
    │ │ │ │ │ schemes/nr_schemes    <- NEW DIRECTORY
    │ │ │ │ │ │ 0/action
    │ │ │ │ │ │ │ access_pattern/
    │ │ │ │ │ │ │ │ sz/min,max
    │ │ │ │ │ │ │ │ nr_accesses/min,max
    │ │ │ │ │ │ │ │ age/min,max
    │ │ │ │ │ │ ...
    │ │ │ │ ...
    │ │ ...

Link: https://lkml.kernel.org/r/20220228081314.5770-7-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit makes DAMON sysfs interface supports the physical address
space monitoring.  Specifically, this commit adds support of the initial
monitoring regions set feature by adding 'regions' directory under each
target directory and makes context operations file to receive 'paddr' in
addition to 'vaddr'.

As a result, the files hierarchy becomes as below:

    /sys/kernel/mm/damon/admin
    │ kdamonds/nr_kdamonds
    │ │ 0/state,pid
    │ │ │ contexts/nr_contexts
    │ │ │ │ 0/operations
    │ │ │ │ │ monitoring_attrs/
    │ │ │ │ │ │ intervals/sample_us,aggr_us,update_us
    │ │ │ │ │ │ nr_regions/min,max
    │ │ │ │ │ targets/nr_targets
    │ │ │ │ │ │ 0/pid_target
    │ │ │ │ │ │ │ regions/nr_regions    <- NEW DIRECTORY
    │ │ │ │ │ │ │ │ 0/start,end
    │ │ │ │ │ │ │ │ ...
    │ │ │ │ │ │ ...
    │ │ │ │ ...
    │ │ ...

Link: https://lkml.kernel.org/r/20220228081314.5770-6-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit links the DAMON sysfs interface to DAMON so that users can
control DAMON via the interface.  In detail, this commit makes writing
'on' to 'state' file constructs DAMON contexts based on values that users
have written to relevant sysfs files and start the context.  It supports
only virtual address spaces monitoring at the moment, though.

The files hierarchy of DAMON sysfs interface after this commit is shown
below.  In the below figure, parents-children relations are represented
with indentations, each directory is having ``/`` suffix, and files in
each directory are separated by comma (",").

    /sys/kernel/mm/damon/admin
    │ kdamonds/nr_kdamonds
    │ │ 0/state,pid
    │ │ │ contexts/nr_contexts
    │ │ │ │ 0/operations
    │ │ │ │ │ monitoring_attrs/
    │ │ │ │ │ │ intervals/sample_us,aggr_us,update_us
    │ │ │ │ │ │ nr_regions/min,max
    │ │ │ │ │ targets/nr_targets
    │ │ │ │ │ │ 0/pid_target
    │ │ │ │ │ │ ...
    │ │ │ │ ...
    │ │ ...

The usage is straightforward.  Writing a number ('N') to each 'nr_*' file
makes directories named '0' to 'N-1'.  Users can construct DAMON contexts
by writing proper values to the files in the straightforward manner and
start each kdamond by writing 'on' to 'kdamonds/<N>/state'.

Link: https://lkml.kernel.org/r/20220228081314.5770-5-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

DAMON's debugfs-based user interface served very well, so far.  However,
it unnecessarily depends on debugfs, while DAMON is not aimed to be used
for only debugging.  Also, the interface receives multiple values via one
file.  For example, schemes file receives 18 values separated by white
spaces.  As a result, it is ineffient, hard to be used, and difficult to
be extended.  Especially, keeping backward compatibility of user space
tools is getting only challenging.  It would be better to implement
another reliable and flexible interface and deprecate the debugfs
interface in long term.

To this end, this commit implements a stub of a part of the new user
interface of DAMON using sysfs.  Specifically, this commit implements the
sysfs control parts for virtual address space monitoring.

More specifically, the idea of the new interface is, using directory
hierarchies and making one file for one value.  The hierarchy that this
commit is introducing is as below.  In the below figure, parents-children
relations are represented with indentations, each directory is having
``/`` suffix, and files in each directory are separated by comma (",").

    /sys/kernel/mm/damon/admin
    │ kdamonds/nr_kdamonds
    │ │ 0/state,pid
    │ │ │ contexts/nr_contexts
    │ │ │ │ 0/operations
    │ │ │ │ │ monitoring_attrs/
    │ │ │ │ │ │ intervals/sample_us,aggr_us,update_us
    │ │ │ │ │ │ nr_regions/min,max
    │ │ │ │ │ targets/nr_targets
    │ │ │ │ │ │ 0/pid_target
    │ │ │ │ │ │ ...
    │ │ │ │ ...
    │ │ ...

Writing a number <N> to each 'nr' file makes directories of name <0> to
<N-1> in the directory of the 'nr' file.  That's all this commit does.
Writing proper values to relevant files will construct the DAMON contexts,
and writing a special keyword, 'on', to 'state' files for each kdamond
will ask DAMON to start the constructed contexts.

For a short example, using below commands for monitoring virtual address
spaces of a given workload is imaginable:

    # cd /sys/kernel/mm/damon/admin/
    # echo 1 > kdamonds/nr_kdamonds
    # echo 1 > kdamonds/0/contexts/nr_contexts
    # echo vaddr > kdamonds/0/contexts/0/operations
    # echo 1 > kdamonds/0/contexts/0/targets/nr_targets
    # echo $(pidof <workload>) > kdamonds/0/contexts/0/targets/0/pid_target
    # echo on > kdamonds/0/state

Please note that this commit is implementing only the sysfs part stub as
abovely mentioned.  This commit doesn't implement the special keywords for
'state' files.  Following commits will do that.

[jiapeng.chong@linux.alibaba.com: fix missing error code in damon_sysfs_attrs_add_dirs()]
  Link: https://lkml.kernel.org/r/20220302111120.24984-1-jiapeng.chong@linux.alibaba.com

Link: https://lkml.kernel.org/r/20220228081314.5770-4-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This commit declares the number of legal values for each DAMON enum types
to make traversals of such DAMON enum types easy and safe.

Link: https://lkml.kernel.org/r/20220228081314.5770-3-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Patch series "Introduce DAMON sysfs interface", v3.

Introduction
============

DAMON's debugfs-based user interface (DAMON_DBGFS) served very well, so
far.  However, it unnecessarily depends on debugfs, while DAMON is not
aimed to be used for only debugging.  Also, the interface receives
multiple values via one file.  For example, schemes file receives 18
values.  As a result, it is inefficient, hard to be used, and difficult to
be extended.  Especially, keeping backward compatibility of user space
tools is getting only challenging.  It would be better to implement
another reliable and flexible interface and deprecate DAMON_DBGFS in long
term.

For the reason, this patchset introduces a sysfs-based new user interface
of DAMON.  The idea of the new interface is, using directory hierarchies
and having one dedicated file for each value.  For a short example, users
can do the virtual address monitoring via the interface as below:

    # cd /sys/kernel/mm/damon/admin/
    # echo 1 > kdamonds/nr_kdamonds
    # echo 1 > kdamonds/0/contexts/nr_contexts
    # echo vaddr > kdamonds/0/contexts/0/operations
    # echo 1 > kdamonds/0/contexts/0/targets/nr_targets
    # echo $(pidof <workload>) > kdamonds/0/contexts/0/targets/0/pid_target
    # echo on > kdamonds/0/state

A brief representation of the files hierarchy of DAMON sysfs interface is
as below.  Childs are represented with indentation, directories are having
'/' suffix, and files in each directory are separated by comma.

    /sys/kernel/mm/damon/admin
    │ kdamonds/nr_kdamonds
    │ │ 0/state,pid
    │ │ │ contexts/nr_contexts
    │ │ │ │ 0/operations
    │ │ │ │ │ monitoring_attrs/
    │ │ │ │ │ │ intervals/sample_us,aggr_us,update_us
    │ │ │ │ │ │ nr_regions/min,max
    │ │ │ │ │ targets/nr_targets
    │ │ │ │ │ │ 0/pid_target
    │ │ │ │ │ │ │ regions/nr_regions
    │ │ │ │ │ │ │ │ 0/start,end
    │ │ │ │ │ │ │ │ ...
    │ │ │ │ │ │ ...
    │ │ │ │ │ schemes/nr_schemes
    │ │ │ │ │ │ 0/action
    │ │ │ │ │ │ │ access_pattern/
    │ │ │ │ │ │ │ │ sz/min,max
    │ │ │ │ │ │ │ │ nr_accesses/min,max
    │ │ │ │ │ │ │ │ age/min,max
    │ │ │ │ │ │ │ quotas/ms,bytes,reset_interval_ms
    │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil
    │ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low
    │ │ │ │ │ │ │ stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds
    │ │ │ │ │ │ ...
    │ │ │ │ ...
    │ │ ...

Detailed usage of the files will be described in the final Documentation
patch of this patchset.

Main Difference Between DAMON_DBGFS and DAMON_SYSFS
---------------------------------------------------

At the moment, DAMON_DBGFS and DAMON_SYSFS provides same features.  One
important difference between them is their exclusiveness.  DAMON_DBGFS
works in an exclusive manner, so that no DAMON worker thread (kdamond) in
the system can run concurrently and interfere somehow.  For the reason,
DAMON_DBGFS asks users to construct all monitoring contexts and start them
at once.  It's not a big problem but makes the operation a little bit
complex and unflexible.

For more flexible usage, DAMON_SYSFS moves the responsibility of
preventing any possible interference to the admins and work in a
non-exclusive manner.  That is, users can configure and start contexts one
by one.  Note that DAMON respects both exclusive groups and non-exclusive
groups of contexts, in a manner similar to that of reader-writer locks.
That is, if any exclusive monitoring contexts (e.g., contexts that started
via DAMON_DBGFS) are running, DAMON_SYSFS does not start new contexts, and
vice versa.

Future Plan of DAMON_DBGFS Deprecation
======================================

Once this patchset is merged, DAMON_DBGFS development will be frozen.
That is, we will maintain it to work as is now so that no users will be
break.  But, it will not be extended to provide any new feature of DAMON.
The support will be continued only until next LTS release.  After that, we
will drop DAMON_DBGFS.

User-space Tooling Compatibility
--------------------------------

As DAMON_SYSFS provides all features of DAMON_DBGFS, all user space
tooling can move to DAMON_SYSFS.  As we will continue supporting
DAMON_DBGFS until next LTS kernel release, user space tools would have
enough time to move to DAMON_SYSFS.

The official user space tool, damo[1], is already supporting both
DAMON_SYSFS and DAMON_DBGFS.  Both correctness tests[2] and performance
tests[3] of DAMON using DAMON_SYSFS also passed.

[1] https://github.com/awslabs/damo
[2] https://github.com/awslabs/damon-tests/tree/master/corr
[3] https://github.com/awslabs/damon-tests/tree/master/perf

Sequence of Patches
===================

First two patches (patches 1-2) make core changes for DAMON_SYSFS.  The
first one (patch 1) allows non-exclusive DAMON contexts so that
DAMON_SYSFS can work in non-exclusive mode, while the second one (patch 2)
adds size of DAMON enum types so that DAMON API users can safely iterate
the enums.

Third patch (patch 3) implements basic sysfs stub for virtual address
spaces monitoring.  Note that this implements only sysfs files and DAMON
is not linked.  Fourth patch (patch 4) links the DAMON_SYSFS to DAMON so
that users can control DAMON using the sysfs files.

Following six patches (patches 5-10) implements other DAMON features that
DAMON_DBGFS supports one by one (physical address space monitoring,
DAMON-based operation schemes, schemes quotas, schemes prioritization
weights, schemes watermarks, and schemes stats).

Following patch (patch 11) adds a simple selftest for DAMON_SYSFS, and the
final one (patch 12) documents DAMON_SYSFS.

This patch (of 13):

To avoid interference between DAMON contexts monitoring overlapping memory
regions, damon_start() works in an exclusive manner.  That is,
damon_start() does nothing bug fails if any context that started by
another instance of the function is still running.  This makes its usage a
little bit restrictive.  However, admins could aware each DAMON usage and
address such interferences on their own in some cases.

This commit hence implements non-exclusive mode of the function and allows
the callers to select the mode.  Note that the exclusive groups and
non-exclusive groups of contexts will respect each other in a manner
similar to that of reader-writer locks.  Therefore, this commit will not
cause any behavioral change to the exclusive groups.

Link: https://lkml.kernel.org/r/20220228081314.5770-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20220228081314.5770-2-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Xin Hao <xhao@linux.alibaba.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>