No need to restrict these anymore, as the worker threads are direct
clones of the original task. Hence we know for a fact that we can
support anything that the regular task can.

Since the only user of proto_ops->flags was to flag PROTO_CMSG_DATA_ONLY,
kill the member and the flag definition too.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

This reverts commit 8d4c3e76.

No longer needed, as the io-wq worker threads have the right identity.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

This reverts commit 0d4370cf.

No longer needed, as the io-wq worker threads have the right identity.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Don't use a kthread for SQPOLL, use a forked worker just like the io-wq
workers. With that done, we can drop the various context grabbing we do
for SQPOLL, it already has everything it needs.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We want to use this in io_uring proper as well, for the SQPOLL thread.
Rename it from fork_thread() to io_wq_fork_thread(), and make it
available through the io-wq.h header.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

If the worker isn't on the free_list, don't attempt to delete it.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We are no longer grabbing state, so no need to maintain an IO identity
that we COW if there are changes.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

The async workers are siblings of the task itself, so by definition we
have all the state that we need. Remove any of the state grabbing that
we have, and requests flagging what they need.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Remove the bool return, and the checking for it in the caller.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Instead of using regular kthread kernel threads, create kernel threads
that are like a real thread that the task would create. This ensures that
we get all the context that we need, without having to carry that state
around. This greatly reduces the code complexity, and the risk of missing
state for a given request type.

With the move away from kthread, we can also dump everything related to
assigned state to the new threads.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Jens Axboe <axboe@kernel.dk>

PF_IO_WORKER are kernel threads too, but they aren't PF_KTHREAD in the
sense that we don't assign ->set_child_tid with our own structure. Just
ensure that every arch sets up the PF_IO_WORKER threads like kthreads
in the arch implementation of copy_thread().
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Just grab it from the worker itself, which we're already passing in.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Move it outside of the io_ring_ctx, and tie it to the io_uring task
context.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We don't support attach anymore, so doesn't make sense to carry the
use_refs reference count. Get rid of it.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Moving towards making the io_wq per ring per task, so we can't really
share it between rings. Which is fine, since we've now dropped some
of that fat from it.

Retain compatibility with how attaching works, so that any attempt to
attach to an fd that doesn't exist, or isn't an io_uring fd, will fail
like it did before.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

When the manager thread starts up, it creates a worker per node for
the given context. Just let these get created dynamically, like we do
for adding further workers.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We hit this case when the task is exiting, and we need somewhere to
do background cleanup of requests. Instead of relying on the io-wq
task manager to do this work for us, just stuff it somewhere where
we can safely run it ourselves directly.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

* for-5.12/io_uring: (21 commits)
  io_uring: run task_work on io_uring_register()
  io_uring: fix leaving invalid req->flags
  io_uring: wait potential ->release() on resurrect
  io_uring: keep generic rsrc infra generic
  io_uring: zero ref_node after killing it
  io_uring: make the !CONFIG_NET helpers a bit more robust
  io_uring: don't hold uring_lock when calling io_run_task_work*
  io_uring: fail io-wq submission from a task_work
  io_uring: don't take uring_lock during iowq cancel
  io_uring: fail links more in io_submit_sqe()
  io_uring: don't do async setup for links' heads
  io_uring: do io_*_prep() early in io_submit_sqe()
  io_uring: split sqe-prep and async setup
  io_uring: don't submit link on error
  io_uring: move req link into submit_state
  io_uring: move io_init_req() into io_submit_sqe()
  io_uring: move io_init_req()'s definition
  io_uring: don't duplicate ->file check in sfr
  io_uring: keep io_*_prep() naming consistent
  io_uring: kill fictitious submit iteration index
  ...

Do run task_work before io_uring_register(), that might make a first
quiesce round much nicer. We generally do that for any syscall invocation
to avoid spurious -EINTR/-ERESTARTSYS, for task_work that we generate.
This patch brings io_uring_register() inline with the two other io_uring
syscalls.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Pull drm updates from Dave Airlie:
 "A pretty normal tree, lots of refactoring across the board, ttm, i915,
  nouveau, and bunch of features in various drivers.

  docs:
   - lots of updated docs

  core:
   - require crtc to have unique primary plane
   - fourcc macro fix
   - PCI bar quirk for bar resizing
   - don't sent hotplug on error
   - move vm code to legacy
   - nuke hose only used on old oboslete alpha

  dma-buf:
   - kernel doc updates
   - improved lock tracking

  dp/hdmi:
   - DP-HDMI2.1 protocol converter support

  ttm:
   - bo size handling cleanup
   - release a pinned bo warning
   - cleanup lru handler
   - avoid using pages with drm_prime_sg_to_page_addr_arrays

  cma-helper:
   - prime/mmap fixes

  bridge:
   - add DP support

  gma500:
   - remove gma3600 support

  i915:
   - try eDP fast/narrow link again with fallback
   - Intel eDP backlight control
   - replace display register read/write macros
   - refactor intel_display.c
   - display power improvements
   - HPD code cleanup
   - Rocketlake display fixes
   - Power/backlight/RPM fixes
   - DG1 display fix
   - IVB/BYT clear residuals security fix again
   - make i915 mitigations options via parameter
   - HSW GT1 GPU hangs fixes
   - DG1 workaround hang fixes
   - TGL DMAR hang avoidance
   - Lots of GT fixes
   - follow on fixes for residuals clear
   - gen7 per-engine-reset support
   - HDCP2.2 + HDCP1.4 GEN12 DP MST support
   - TGL clear color support
   - backlight refactoring
   - VRR/Adaptive sync enabling on DP/EDP for TGL+
   - async flips for all ilk+

  amdgpu:
   - rework IH ring handling (Vega/Navi)
   - rework HDP handling (Vega/Navi)
   - swSMU updates for renoir/vangogh
   - Sienna Cichild overdrive support
   - FP16 on DCE8-11 support
   - GPU reset on navy flounder/vangogh
   - SMU profile fixes for APU
   - SR-IOV fixes
   - Vangogh SMU fixes
   - fan speed control fixes

  amdkfd:
   - config handling fix
   - buffer free fix
   - recursive lock warnings fix

  nouveau:
   - Turing MMU fault recovery fixes
   - mDP connectors reporting fix
   - audio locking fixes
   - rework engines/instances code to support new scheme

  tegra:
   - VIC newer firmware support
   - display/gr2d fixes for older tegra
   - pm reference leak fix

  mediatek:
   - SOC MT8183 support
   - decouple sub driver + share mtk mutex driver

  radeon:
   - PCI resource fix for some platforms

  ingenic:
   - pm support
   - 8-bit delta RGB panels

  vmwgfx:
   - managed driver helpers

  vc4:
   - BCM2711 DSI1 support
   - converted to atomic helpers
   - enable 10/12 bpc outputs
   - gem prime mmap helpers
   - CEC fix

  omap:
   - use degamma table
   - CTM support
   - rework DSI support

  imx:
   - stack usage fixes
   - drm managed support
   - imx-tve clock provider leak fix
-

  rcar-du:
   - default mode fixes
   - conversion to managed API

  hisilicon:
   - use simple encoder

  vkms:
   - writeback connector support

  d3:
   - BT2020 support"

* tag 'drm-next-2021-02-19' of git://anongit.freedesktop.org/drm/drm: (1459 commits)
  drm/amdgpu: Set reference clock to 100Mhz on Renoir (v2)
  drm/radeon: OLAND boards don't have VCE
  drm/amdkfd: Fix recursive lock warnings
  drm/amd/display: Add FPU wrappers to dcn21_validate_bandwidth()
  drm/amd/display: Fix potential integer overflow
  drm/amdgpu/display: remove hdcp_srm sysfs on device removal
  drm/amdgpu: fix CGTS_TCC_DISABLE register offset on gfx10.3
  drm/i915/gt: Correct surface base address for renderclear
  drm/i915: Disallow plane x+w>stride on ilk+ with X-tiling
  drm/nouveau/top/ga100: initial support
  drm/nouveau/top: add ioctrl/nvjpg
  drm/nouveau/privring: rename from ibus
  drm/nouveau/nvkm: remove nvkm_subdev.index
  drm/nouveau/nvkm: determine subdev id/order from layout
  drm/nouveau/vic: switch to instanced constructor
  drm/nouveau/sw: switch to instanced constructor
  drm/nouveau/sec2: switch to instanced constructor
  drm/nouveau/sec: switch to instanced constructor
  drm/nouveau/pm: switch to instanced constructor
  drm/nouveau/nvenc: switch to instanced constructor
  ...

Pull sound updates from Takashi Iwai:
 "A relatively calm release at this time, and no massive code changes
  are found in the stats, while a wide range of code refactoring and
  cleanup have been done.

  Note that this update includes the tree-wide trivial changes for
  dropping the return value from ISA remove callbacks, too.

  Below lists up some highlight:

  ALSA Core:
   - Support for the software jack injection via debugfs
   - Fixes for sync_stop PCM operations

  HD-audio and USB-audio:
   - A few usual HD-audio device quirks
   - Updates for Tegra HD-audio
   - More quirks for Pioneer and other USB-audio devices
   - Stricter state checks at USB-audio disconnection

  ASoC:
   - Continued code refactoring, cleanup and fixes in ASoC core API
   - A KUnit testsuite for the topology code
   - Lots of ASoC Intel driver Realtek codec updates, quirk additions
     and fixes
   - Support for Ingenic JZ4760(B), Intel AlderLake-P, DT configured
     nVidia cards, Qualcomm lpass-rx-macro and lpass-tx-macro
   - Removal of obsolete SIRF prima/atlas, Txx9 and ZTE zx drivers

  Others:
   - Drop return value from ISA driver remove callback
   - Cleanup with DIV_ROUND_UP() macro
   - FireWire updates, HDSP output loopback support"

* tag 'sound-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (322 commits)
  ALSA: hda: intel-dsp-config: add Alder Lake support
  ASoC: soc-pcm: fix hw param limits calculation for multi-DAI
  ASoC: Intel: bytcr_rt5640: Add quirk for the Acer One S1002 tablet
  ASoC: Intel: bytcr_rt5651: Add quirk for the Jumper EZpad 7 tablet
  ASoC: Intel: bytcr_rt5640: Add quirk for the Voyo Winpad A15 tablet
  ASoC: Intel: bytcr_rt5640: Add quirk for the Estar Beauty HD MID 7316R tablet
  ASoC: soc-pcm: fix hwparams min/max init for dpcm
  ALSA: hda/realtek: Quirk for HP Spectre x360 14 amp setup
  ALSA: usb-audio: Add implicit fb quirk for BOSS GP-10
  ALSA: hda: Add another CometLake-H PCI ID
  ASoC: soc-pcm: add soc_pcm_hw_update_format()
  ASoC: soc-pcm: add soc_pcm_hw_update_chan()
  ASoC: soc-pcm: add soc_pcm_hw_update_rate()
  ASoC: wm_adsp: Remove unused control callback structure
  ASoC: SOF: relax ABI checks and avoid unnecessary warnings
  ASoC: codecs: lpass-tx-macro: add dapm widgets and route
  ASoC: codecs: lpass-tx-macro: add support for lpass tx macro
  ASoC: qcom: dt-bindings: add bindings for lpass tx macro codec
  ASoC: codecs: lpass-rx-macro: add iir widgets
  ASoC: codecs: lpass-rx-macro: add dapm widgets and route
  ...

Pull media updates from Mauro Carvalho Chehab:

 - some core fixes in VB2 mem2mem support

 - some improvements and cleanups in V4L2 async kAPI

 - newer controls in V4L2 API for H-264 and HEVC codecs

 - allegro-dvt driver was promoted from staging

 - new i2c sendor drivers: imx334, ov5648, ov8865

 - new automobile camera module: rdacm21

 - ipu3 cio2 driver started gained support for some ACPI BIOSes

 - new ATSC frontend: MaxLinear mxl692 VSB tuner/demod

 - the SMIA/CCS driver gained more support for CSS standard

 - several driver fixes, updates and improvements

* tag 'media/v5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (362 commits)
  media: v4l: async: Fix kerneldoc documentation for async functions
  media: i2c: max9271: Add MODULE_* macros
  media: i2c: Kconfig: Make MAX9271 a module
  media: imx334: 'ret' is uninitialized, should have been PTR_ERR()
  media: i2c: Add imx334 camera sensor driver
  media: dt-bindings: media: Add bindings for imx334
  media: ov8856: Configure sensor for GRBG Bayer for all modes
  media: i2c: imx219: Implement V4L2_CID_LINK_FREQ control
  media: ov5675: fix vflip/hflip control
  media: ipu3-cio2: Build bridge only if ACPI is enabled
  media: Remove the legacy v4l2-clk API
  media: ov6650: Use the generic clock framework
  media: mt9m111: Use the generic clock framework
  media: ov9640: Use the generic clock framework
  media: pxa_camera: Drop the v4l2-clk clock register
  media: mach-pxa: Register the camera sensor fixed-rate clock
  media: i2c: imx258: get clock from device properties and enable it via runtime PM
  media: i2c: imx258: simplify getting state container
  media: i2c: imx258: add support for binding via device tree
  media: dt-bindings: media: imx258: add bindings for IMX258 sensor
  ...

Pull JFFS2/UBIFS and UBI updates from Richard Weinberger:
 "JFFS2:
   - Fix for use-after-free in jffs2_sum_write_data()
   - Fix for out-of-bounds access in jffs2_zlib_compress()

  UBI:
   - Remove dead/useless code

  UBIFS:
   - Fix for a memory leak in ubifs_init_authentication()
   - Fix for high stack usage
   - Fix for a off-by-one error in xattrs code"

* tag 'for-linus-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs:
  ubifs: Fix error return code in alloc_wbufs()
  jffs2: check the validity of dstlen in jffs2_zlib_compress()
  ubifs: Fix off-by-one error
  ubifs: replay: Fix high stack usage, again
  ubifs: Fix memleak in ubifs_init_authentication
  jffs2: fix use after free in jffs2_sum_write_data()
  ubi: eba: Delete useless kfree code
  ubi: remove dead code in validate_vid_hdr()

Pull MTD updates from Richard Weinberger:
 "MTD core changes:
   - Initial support for BCM4908 partitions

  Raw NAND controller drivers:
   - Intel: Fix an error handling path in 'ebu_dma_start()'
   - Tango: Remove the driver
   - Marvell: Convert comma to semicolon
   - MXC: Convert comma to semicolon
   - Qcom: Add support for Qcom SMEM parser

  Related MTD changes:
   - parsers: Add Qcom SMEM parser

  SPI NOR core changes:
   - Add non-uniform erase fixes.
   - Add Global Block Unlock command. It is defined by few flash
     vendors, and it is used for now just by sst.

  SPI NOR controller drivers changes:
   - intel-spi: Add support for Intel Alder Lake-P SPI serial flash.
   - hisi-sfc: Put child node np on error path"

* tag 'mtd/for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux: (23 commits)
  dt-bindings: mtd: add binding for BCM4908 partitions
  dt-bindings: mtd: move partition binding to its own file
  mtd: spi-nor: sst: Add support for Global Unlock on sst26vf
  mtd: spi-nor: Add Global Block Unlock command
  mtd: spi-nor: core: Add erase size check for erase command initialization
  mtd: spi-nor: core: Fix erase type discovery for overlaid region
  mtd: spi-nor: sfdp: Fix last erase region marking
  mtd: spi-nor: sfdp: Fix wrong erase type bitmask for overlaid region
  mtd: rawnand: intel: Fix an error handling path in 'ebu_dma_start()'
  mtd: rawnand: tango: Remove the driver
  mtd: rawnand: marvell: convert comma to semicolon
  mtd: st_spi_fsm: convert comma to semicolon
  mtd: convert comma to semicolon
  mtd: parsers: afs: Fix freeing the part name memory in failure
  mtd: parser: imagetag: fix error codes in bcm963xx_parse_imagetag_partitions()
  mtd: phram: use div_u64_rem to stop overwrite len in phram_setup
  mtd: remove redundant assignment to pointer eb
  mtd: spi-nor: hisi-sfc: Put child node np on error path
  mtd: spi-nor: intel-spi: Add support for Intel Alder Lake-P SPI serial flash
  mtd: rawnand: qcom: Add support for Qcom SMEM parser
  ...

Pull UML updates from Richard Weinberger:

 - Many cleanups and fixes for our virtio code

 - Add support for a pseudo RTC

 - Fix for a possible jailbreak

 - Minor fixes (spelling, header files)

* tag 'for-linux-5.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  um: irq.h: include <asm-generic/irq.h>
  um: io.h: include <linux/types.h>
  um: add a pseudo RTC
  um: remove process stub VMA
  um: rework userspace stubs to not hard-code stub location
  um: separate child and parent errors in clone stub
  um: defer killing userspace on page table update failures
  um: mm: check more comprehensively for stub changes
  um: print register names in wait_for_stub
  um: hostfs: use a kmem cache for inodes
  mm: Remove arch_remap() and mm-arch-hooks.h
  um: fix spelling mistake in Kconfig "privleges" -> "privileges"
  um: virtio: allow devices to be configured for wakeup
  um: time-travel: rework interrupt handling in ext mode
  um: virtio: disable VQs during suspend
  um: virtio: fix handling of messages without payload
  um: virtio: clean up a comment

Pull s390 updates from Vasily Gorbik:

 - Convert to using the generic entry infrastructure.

 - Add vdso time namespace support.

 - Switch s390 and alpha to 64-bit ino_t. As discussed at

     https://lore.kernel.org/linux-mm/YCV7QiyoweJwvN+m@osiris/

 - Get rid of expensive stck (store clock) usages where possible.
   Utilize cpu alternatives to patch stckf when supported.

 - Make tod_clock usage less error prone by converting it to a union and
   rework code which is using it.

 - Machine check handler fixes and cleanups.

 - Drop couple of minor inline asm optimizations to fix clang build.

 - Default configs changes notably to make libvirt happy.

 - Various changes to rework and improve qdio code.

 - Other small various fixes and improvements all over the code.

* tag 's390-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (68 commits)
  s390/qdio: remove 'merge_pending' mechanism
  s390/qdio: improve handling of PENDING buffers for QEBSM devices
  s390/qdio: rework q->qdio_error indication
  s390/qdio: inline qdio_kick_handler()
  s390/time: remove get_tod_clock_ext()
  s390/crypto: use store_tod_clock_ext()
  s390/hypfs: use store_tod_clock_ext()
  s390/debug: use union tod_clock
  s390/kvm: use union tod_clock
  s390/vdso: use union tod_clock
  s390/time: convert tod_clock_base to union
  s390/time: introduce new store_tod_clock_ext()
  s390/time: rename store_tod_clock_ext() and use union tod_clock
  s390/time: introduce union tod_clock
  s390,alpha: switch to 64-bit ino_t
  s390: split cleanup_sie
  s390: use r13 in cleanup_sie as temp register
  s390: fix kernel asce loading when sie is interrupted
  s390: add stack for machine check handler
  s390: use WRITE_ONCE when re-allocating async stack
  ...

Pull KVM updates from Paolo Bonzini:
 "x86:

   - Support for userspace to emulate Xen hypercalls

   - Raise the maximum number of user memslots

   - Scalability improvements for the new MMU.

     Instead of the complex "fast page fault" logic that is used in
     mmu.c, tdp_mmu.c uses an rwlock so that page faults are concurrent,
     but the code that can run against page faults is limited. Right now
     only page faults take the lock for reading; in the future this will
     be extended to some cases of page table destruction. I hope to
     switch the default MMU around 5.12-rc3 (some testing was delayed
     due to Chinese New Year).

   - Cleanups for MAXPHYADDR checks

   - Use static calls for vendor-specific callbacks

   - On AMD, use VMLOAD/VMSAVE to save and restore host state

   - Stop using deprecated jump label APIs

   - Workaround for AMD erratum that made nested virtualization
     unreliable

   - Support for LBR emulation in the guest

   - Support for communicating bus lock vmexits to userspace

   - Add support for SEV attestation command

   - Miscellaneous cleanups

  PPC:

   - Support for second data watchpoint on POWER10

   - Remove some complex workarounds for buggy early versions of POWER9

   - Guest entry/exit fixes

  ARM64:

   - Make the nVHE EL2 object relocatable

   - Cleanups for concurrent translation faults hitting the same page

   - Support for the standard TRNG hypervisor call

   - A bunch of small PMU/Debug fixes

   - Simplification of the early init hypercall handling

  Non-KVM changes (with acks):

   - Detection of contended rwlocks (implemented only for qrwlocks,
     because KVM only needs it for x86)

   - Allow __DISABLE_EXPORTS from assembly code

   - Provide a saner follow_pfn replacements for modules"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (192 commits)
  KVM: x86/xen: Explicitly pad struct compat_vcpu_info to 64 bytes
  KVM: selftests: Don't bother mapping GVA for Xen shinfo test
  KVM: selftests: Fix hex vs. decimal snafu in Xen test
  KVM: selftests: Fix size of memslots created by Xen tests
  KVM: selftests: Ignore recently added Xen tests' build output
  KVM: selftests: Add missing header file needed by xAPIC IPI tests
  KVM: selftests: Add operand to vmsave/vmload/vmrun in svm.c
  KVM: SVM: Make symbol 'svm_gp_erratum_intercept' static
  locking/arch: Move qrwlock.h include after qspinlock.h
  KVM: PPC: Book3S HV: Fix host radix SLB optimisation with hash guests
  KVM: PPC: Book3S HV: Ensure radix guest has no SLB entries
  KVM: PPC: Don't always report hash MMU capability for P9 < DD2.2
  KVM: PPC: Book3S HV: Save and restore FSCR in the P9 path
  KVM: PPC: remove unneeded semicolon
  KVM: PPC: Book3S HV: Use POWER9 SLBIA IH=6 variant to clear SLB
  KVM: PPC: Book3S HV: No need to clear radix host SLB before loading HPT guest
  KVM: PPC: Book3S HV: Fix radix guest SLB side channel
  KVM: PPC: Book3S HV: Remove support for running HPT guest on RPT host without mixed mode support
  KVM: PPC: Book3S HV: Introduce new capability for 2nd DAWR
  KVM: PPC: Book3S HV: Add infrastructure to support 2nd DAWR
  ...

Merge tag 'hyperv-next-signed-20210216' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull Hyper-V updates from Wei Liu:

 - VMBus hardening patches from Andrea Parri and Andres Beltran.

 - Patches to make Linux boot as the root partition on Microsoft
   Hypervisor from Wei Liu.

 - One patch to add a new sysfs interface to support hibernation on
   Hyper-V from Dexuan Cui.

 - Two miscellaneous clean-up patches from Colin and Gustavo.

* tag 'hyperv-next-signed-20210216' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: (31 commits)
  Revert "Drivers: hv: vmbus: Copy packets sent by Hyper-V out of the ring buffer"
  iommu/hyperv: setup an IO-APIC IRQ remapping domain for root partition
  x86/hyperv: implement an MSI domain for root partition
  asm-generic/hyperv: import data structures for mapping device interrupts
  asm-generic/hyperv: introduce hv_device_id and auxiliary structures
  asm-generic/hyperv: update hv_interrupt_entry
  asm-generic/hyperv: update hv_msi_entry
  x86/hyperv: implement and use hv_smp_prepare_cpus
  x86/hyperv: provide a bunch of helper functions
  ACPI / NUMA: add a stub function for node_to_pxm()
  x86/hyperv: handling hypercall page setup for root
  x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary
  x86/hyperv: allocate output arg pages if required
  clocksource/hyperv: use MSR-based access if running as root
  Drivers: hv: vmbus: skip VMBus initialization if Linux is root
  x86/hyperv: detect if Linux is the root partition
  asm-generic/hyperv: change HV_CPU_POWER_MANAGEMENT to HV_CPU_MANAGEMENT
  hv: hyperv.h: Replace one-element array with flexible-array in struct icmsg_negotiate
  hv_netvsc: Restrict configurations on isolated guests
  Drivers: hv: vmbus: Enforce 'VMBus version >= 5.2' on isolated guests
  ...

Pull parisc updates from Helge Deller:

 - Optimize parisc page table locks by using the existing
   page_table_lock

 - Export argv0-preserve flag in binfmt_misc for usage in qemu-user

 - Fix interrupt table (IVT) checksum so firmware will call crash
   handler (HPMC)

 - Increase IRQ stack to 64kb on 64-bit kernel

 - Switch to common devmem_is_allowed() implementation

 - Minor fix to get_whan()

* 'parisc-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  binfmt_misc: pass binfmt_misc flags to the interpreter
  parisc: Optimize per-pagetable spinlocks
  parisc: Replace test_ti_thread_flag() with test_tsk_thread_flag()
  parisc: Bump 64-bit IRQ stack size to 64 KB
  parisc: Fix IVT checksum calculation wrt HPMC
  parisc: Use the generic devmem_is_allowed()
  parisc: Drop out of get_whan() if task is running again

Pull MIPS updates from Thomas Bogendoerfer:

 - added support for Nintendo N64

 - added support for Realtek RTL83XX SoCs

 - kaslr support for Loongson64

 - first steps to get rid of set_fs()

 - DMA runtime coherent/non-coherent selection cleanup

 - cleanups and fixes

* tag 'mips_5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (98 commits)
  Revert "MIPS: Add basic support for ptrace single step"
  vmlinux.lds.h: catch more UBSAN symbols into .data
  MIPS: kernel: Drop kgdb_call_nmi_hook
  MAINTAINERS: Add git tree for KVM/mips
  MIPS: Use common way to parse elfcorehdr
  MIPS: Simplify EVA cache handling
  Revert "MIPS: kernel: {ftrace,kgdb}: Set correct address limit for cache flushes"
  MIPS: remove CONFIG_DMA_PERDEV_COHERENT
  MIPS: remove CONFIG_DMA_MAYBE_COHERENT
  driver core: lift dma_default_coherent into common code
  MIPS: refactor the runtime coherent vs noncoherent DMA indicators
  MIPS/alchemy: factor out the DMA coherent setup
  MIPS/malta: simplify plat_setup_iocoherency
  MIPS: Add basic support for ptrace single step
  MAINTAINERS: replace non-matching patterns for loongson{2,3}
  MIPS: Make check condition for SDBBP consistent with EJTAG spec
  mips: Replace lkml.org links with lore
  Revert "MIPS: microMIPS: Fix the judgment of mm_jr16_op and mm_jalr_op"
  MIPS: crash_dump.c: Simplify copy_oldmem_page()
  Revert "mips: Manually call fdt_init_reserved_mem() method"
  ...

Pull m68k updates from Geert Uytterhoeven:

 - fix ADB autopoll regression

 - defconfig updates

* tag 'm68k-for-v5.12-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  macintosh/adb-iop: Use big-endian autopoll mask
  m68k: defconfig: Update defconfigs for v5.11-rc1

Pull arm64 updates from Will Deacon:

 - vDSO build improvements including support for building with BSD.

 - Cleanup to the AMU support code and initialisation rework to support
   cpufreq drivers built as modules.

 - Removal of synthetic frame record from exception stack when entering
   the kernel from EL0.

 - Add support for the TRNG firmware call introduced by Arm spec
   DEN0098.

 - Cleanup and refactoring across the board.

 - Avoid calling arch_get_random_seed_long() from
   add_interrupt_randomness()

 - Perf and PMU updates including support for Cortex-A78 and the v8.3
   SPE extensions.

 - Significant steps along the road to leaving the MMU enabled during
   kexec relocation.

 - Faultaround changes to initialise prefaulted PTEs as 'old' when
   hardware access-flag updates are supported, which drastically
   improves vmscan performance.

 - CPU errata updates for Cortex-A76 (#1463225) and Cortex-A55
   (#1024718)

 - Preparatory work for yielding the vector unit at a finer granularity
   in the crypto code, which in turn will one day allow us to defer
   softirq processing when it is in use.

 - Support for overriding CPU ID register fields on the command-line.

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (85 commits)
  drivers/perf: Replace spin_lock_irqsave to spin_lock
  mm: filemap: Fix microblaze build failure with 'mmu_defconfig'
  arm64: Make CPU_BIG_ENDIAN depend on ld.bfd or ld.lld 13.0.0+
  arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line
  arm64: Defer enabling pointer authentication on boot core
  arm64: cpufeatures: Allow disabling of BTI from the command-line
  arm64: Move "nokaslr" over to the early cpufeature infrastructure
  KVM: arm64: Document HVC_VHE_RESTART stub hypercall
  arm64: Make kvm-arm.mode={nvhe, protected} an alias of id_aa64mmfr1.vh=0
  arm64: Add an aliasing facility for the idreg override
  arm64: Honor VHE being disabled from the command-line
  arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line
  arm64: cpufeature: Add an early command-line cpufeature override facility
  arm64: Extract early FDT mapping from kaslr_early_init()
  arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding()
  arm64: cpufeature: Add global feature override facility
  arm64: Move SCTLR_EL1 initialisation to EL-agnostic code
  arm64: Simplify init_el2_state to be non-VHE only
  arm64: Move VHE-specific SPE setup to mutate_to_vhe()
  arm64: Drop early setting of MDSCR_EL2.TPMS
  ...

Pull xen updates from Juergen Gross:
 "A series of Xen related security fixes, all related to limited error
  handling in Xen backend drivers"

* tag 'for-linus-5.12-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen-blkback: fix error handling in xen_blkbk_map()
  xen-scsiback: don't "handle" error by BUG()
  xen-netback: don't "handle" error by BUG()
  xen-blkback: don't "handle" error by BUG()
  xen/arm: don't ignore return errors from set_phys_to_machine
  Xen/gntdev: correct error checking in gntdev_map_grant_pages()
  Xen/gntdev: correct dev_bus_addr handling in gntdev_map_grant_pages()
  Xen/x86: also check kernel mapping in set_foreign_p2m_mapping()
  Xen/x86: don't bail early from clear_foreign_p2m_mapping()

Pull performance event updates from Ingo Molnar:

 - Add CPU-PMU support for Intel Sapphire Rapids CPUs

 - Extend the perf ABI with PERF_SAMPLE_WEIGHT_STRUCT, to offer
   two-parameter sampling event feedback. Not used yet, but is intended
   for Golden Cove CPU-PMU, which can provide both the instruction
   latency and the cache latency information for memory profiling
   events.

 - Remove experimental, default-disabled perfmon-v4 counter_freezing
   support that could only be enabled via a boot option. The hardware is
   hopelessly broken, we'd like to make sure nobody starts relying on
   this, as it would only end in tears.

 - Fix energy/power events on Intel SPR platforms

 - Simplify the uprobes resume_execution() logic

 - Misc smaller fixes.

* tag 'perf-core-2021-02-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/rapl: Fix psys-energy event on Intel SPR platform
  perf/x86/rapl: Only check lower 32bits for RAPL energy counters
  perf/x86/rapl: Add msr mask support
  perf/x86/kvm: Add Cascade Lake Xeon steppings to isolation_ucodes[]
  perf/x86/intel: Support CPUID 10.ECX to disable fixed counters
  perf/x86/intel: Add perf core PMU support for Sapphire Rapids
  perf/x86/intel: Filter unsupported Topdown metrics event
  perf/x86/intel: Factor out intel_update_topdown_event()
  perf/core: Add PERF_SAMPLE_WEIGHT_STRUCT
  perf/intel: Remove Perfmon-v4 counter_freezing support
  x86/perf: Use static_call for x86_pmu.guest_get_msrs
  perf/x86/intel/uncore: With > 8 nodes, get pci bus die id from NUMA info
  perf/x86/intel/uncore: Store the logical die id instead of the physical die id.
  x86/kprobes: Do not decode opcode in resume_execution()

Pull scheduler updates from Ingo Molnar:
 "Core scheduler updates:

   - Add CONFIG_PREEMPT_DYNAMIC: this in its current form adds the
     preempt=none/voluntary/full boot options (default: full), to allow
     distros to build a PREEMPT kernel but fall back to close to
     PREEMPT_VOLUNTARY (or PREEMPT_NONE) runtime scheduling behavior via
     a boot time selection.

     There's also the /debug/sched_debug switch to do this runtime.

     This feature is implemented via runtime patching (a new variant of
     static calls).

     The scope of the runtime patching can be best reviewed by looking
     at the sched_dynamic_update() function in kernel/sched/core.c.

     ( Note that the dynamic none/voluntary mode isn't 100% identical,
       for example preempt-RCU is available in all cases, plus the
       preempt count is maintained in all models, which has runtime
       overhead even with the code patching. )

     The PREEMPT_VOLUNTARY/PREEMPT_NONE models, used by the vast
     majority of distributions, are supposed to be unaffected.

   - Fix ignored rescheduling after rcu_eqs_enter(). This is a bug that
     was found via rcutorture triggering a hang. The bug is that
     rcu_idle_enter() may wake up a NOCB kthread, but this happens after
     the last generic need_resched() check. Some cpuidle drivers fix it
     by chance but many others don't.

     In true 2020 fashion the original bug fix has grown into a 5-patch
     scheduler/RCU fix series plus another 16 RCU patches to address the
     underlying issue of missed preemption events. These are the initial
     fixes that should fix current incarnations of the bug.

   - Clean up rbtree usage in the scheduler, by providing & using the
     following consistent set of rbtree APIs:

       partial-order; less() based:
         - rb_add(): add a new entry to the rbtree
         - rb_add_cached(): like rb_add(), but for a rb_root_cached

       total-order; cmp() based:
         - rb_find(): find an entry in an rbtree
         - rb_find_add(): find an entry, and add if not found

         - rb_find_first(): find the first (leftmost) matching entry
         - rb_next_match(): continue from rb_find_first()
         - rb_for_each(): iterate a sub-tree using the previous two

   - Improve the SMP/NUMA load-balancer: scan for an idle sibling in a
     single pass. This is a 4-commit series where each commit improves
     one aspect of the idle sibling scan logic.

   - Improve the cpufreq cooling driver by getting the effective CPU
     utilization metrics from the scheduler

   - Improve the fair scheduler's active load-balancing logic by
     reducing the number of active LB attempts & lengthen the
     load-balancing interval. This improves stress-ng mmapfork
     performance.

   - Fix CFS's estimated utilization (util_est) calculation bug that can
     result in too high utilization values

  Misc updates & fixes:

   - Fix the HRTICK reprogramming & optimization feature

   - Fix SCHED_SOFTIRQ raising race & warning in the CPU offlining code

   - Reduce dl_add_task_root_domain() overhead

   - Fix uprobes refcount bug

   - Process pending softirqs in flush_smp_call_function_from_idle()

   - Clean up task priority related defines, remove *USER_*PRIO and
     USER_PRIO()

   - Simplify the sched_init_numa() deduplication sort

   - Documentation updates

   - Fix EAS bug in update_misfit_status(), which degraded the quality
     of energy-balancing

   - Smaller cleanups"

* tag 'sched-core-2021-02-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (51 commits)
  sched,x86: Allow !PREEMPT_DYNAMIC
  entry/kvm: Explicitly flush pending rcuog wakeup before last rescheduling point
  entry: Explicitly flush pending rcuog wakeup before last rescheduling point
  rcu/nocb: Trigger self-IPI on late deferred wake up before user resume
  rcu/nocb: Perform deferred wake up before last idle's need_resched() check
  rcu: Pull deferred rcuog wake up to rcu_eqs_enter() callers
  sched/features: Distinguish between NORMAL and DEADLINE hrtick
  sched/features: Fix hrtick reprogramming
  sched/deadline: Reduce rq lock contention in dl_add_task_root_domain()
  uprobes: (Re)add missing get_uprobe() in __find_uprobe()
  smp: Process pending softirqs in flush_smp_call_function_from_idle()
  sched: Harden PREEMPT_DYNAMIC
  static_call: Allow module use without exposing static_call_key
  sched: Add /debug/sched_preempt
  preempt/dynamic: Support dynamic preempt with preempt= boot option
  preempt/dynamic: Provide irqentry_exit_cond_resched() static call
  preempt/dynamic: Provide preempt_schedule[_notrace]() static calls
  preempt/dynamic: Provide cond_resched() and might_resched() static calls
  preempt: Introduce CONFIG_PREEMPT_DYNAMIC
  static_call: Provide DEFINE_STATIC_CALL_RET0()
  ...

Pull tlb gather updates from Ingo Molnar:
 "Theses fix MM (soft-)dirty bit management in the procfs code & clean
  up the TLB gather API"

* tag 'core-mm-2021-02-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/ldt: Use tlb_gather_mmu_fullmm() when freeing LDT page-tables
  tlb: arch: Remove empty __tlb_remove_tlb_entry() stubs
  tlb: mmu_gather: Remove start/end arguments from tlb_gather_mmu()
  tlb: mmu_gather: Introduce tlb_gather_mmu_fullmm()
  tlb: mmu_gather: Remove unused start/end arguments from tlb_finish_mmu()
  mm: proc: Invalidate TLB after clearing soft-dirty page state

Pull locking updates from Ingo Molnar:
 "Core locking primitives updates:
    - Remove mutex_trylock_recursive() from the API - no users left
    - Simplify + constify the futex code a bit

  Lockdep updates:
    - Teach lockdep about local_lock_t
    - Add CONFIG_DEBUG_IRQFLAGS=y debug config option to check for
      potentially unsafe IRQ mask restoration patterns. (I.e.
      calling raw_local_irq_restore() with IRQs enabled.)
    - Add wait context self-tests
    - Fix graph lock corner case corrupting internal data structures
    - Fix noinstr annotations

  LKMM updates:
    - Simplify the litmus tests
    - Documentation fixes

  KCSAN updates:
    - Re-enable KCSAN instrumentation in lib/random32.c

  Misc fixes:
    - Don't branch-trace static label APIs
    - DocBook fix
    - Remove stale leftover empty file"

* tag 'locking-core-2021-02-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
  checkpatch: Don't check for mutex_trylock_recursive()
  locking/mutex: Kill mutex_trylock_recursive()
  s390: Use arch_local_irq_{save,restore}() in early boot code
  lockdep: Noinstr annotate warn_bogus_irq_restore()
  locking/lockdep: Avoid unmatched unlock
  locking/rwsem: Remove empty rwsem.h
  locking/rtmutex: Add missing kernel-doc markup
  futex: Remove unneeded gotos
  futex: Change utime parameter to be 'const ... *'
  lockdep: report broken irq restoration
  jump_label: Do not profile branch annotations
  locking: Add Reviewers
  locking/selftests: Add local_lock inversion tests
  locking/lockdep: Exclude local_lock_t from IRQ inversions
  locking/lockdep: Clean up check_redundant() a bit
  locking/lockdep: Add a skip() function to __bfs()
  locking/lockdep: Mark local_lock_t
  locking/selftests: More granular debug_locks_verbose
  lockdep/selftest: Add wait context selftests
  tools/memory-model: Fix typo in klitmus7 compatibility table
  ...

Pull RCU updates from Ingo Molnar:
 "These are the latest RCU updates for v5.12:

   - Documentation updates.

   - Miscellaneous fixes.

   - kfree_rcu() updates: Addition of mem_dump_obj() to provide
     allocator return addresses to more easily locate bugs. This has a
     couple of RCU-related commits, but is mostly MM. Was pulled in with
     akpm's agreement.

   - Per-callback-batch tracking of numbers of callbacks, which enables
     better debugging information and smarter reactions to large numbers
     of callbacks.

   - The first round of changes to allow CPUs to be runtime switched
     from and to callback-offloaded state.

   - CONFIG_PREEMPT_RT-related changes.

   - RCU CPU stall warning updates.

   - Addition of polling grace-period APIs for SRCU.

   - Torture-test and torture-test scripting updates, including a
     "torture everything" script that runs rcutorture, locktorture,
     scftorture, rcuscale, and refscale. Plus does an allmodconfig
     build.

   - nolibc fixes for the torture tests"

* tag 'core-rcu-2021-02-17' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (130 commits)
  percpu_ref: Dump mem_dump_obj() info upon reference-count underflow
  rcu: Make call_rcu() print mem_dump_obj() info for double-freed callback
  mm: Make mem_obj_dump() vmalloc() dumps include start and length
  mm: Make mem_dump_obj() handle vmalloc() memory
  mm: Make mem_dump_obj() handle NULL and zero-sized pointers
  mm: Add mem_dump_obj() to print source of memory block
  tools/rcutorture: Fix position of -lgcc in mkinitrd.sh
  tools/nolibc: Fix position of -lgcc in the documented example
  tools/nolibc: Emit detailed error for missing alternate syscall number definitions
  tools/nolibc: Remove incorrect definitions of __ARCH_WANT_*
  tools/nolibc: Get timeval, timespec and timezone from linux/time.h
  tools/nolibc: Implement poll() based on ppoll()
  tools/nolibc: Implement fork() based on clone()
  tools/nolibc: Make getpgrp() fall back to getpgid(0)
  tools/nolibc: Make dup2() rely on dup3() when available
  tools/nolibc: Add the definition for dup()
  rcutorture: Add rcutree.use_softirq=0 to RUDE01 and TASKS01
  torture: Maintain torture-specific set of CPUs-online books
  torture: Clean up after torture-test CPU hotplugging
  rcutorture: Make object_debug also double call_rcu() heap object
  ...

Pull timer updates from Thomas Gleixner:
 "Time and timer updates:

   - Instead of new drivers remove tango, sirf, u300 and atlas drivers

   - Add suspend/resume support for microchip pit64b

   - The usual fixes, improvements and cleanups here and there"

* tag 'timers-core-2021-02-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timens: Delete no-op time_ns_init()
  alarmtimer: Update kerneldoc
  clocksource/drivers/timer-microchip-pit64b: Add clocksource suspend/resume
  clocksource/drivers/prima: Remove sirf prima driver
  clocksource/drivers/atlas: Remove sirf atlas driver
  clocksource/drivers/tango: Remove tango driver
  clocksource/drivers/u300: Remove the u300 driver
  dt-bindings: timer: nuvoton: Clarify that interrupt of timer 0 should be specified
  clocksource/drivers/davinci: Move pr_fmt() before the includes
  clocksource/drivers/efm32: Drop unused timer code