"if (nxt)" is always true, as it was checked in the while's condition.
io_wq_current_is_worker() is unnecessary, as non-async callers don't
pass nxt, so io_queue_async_work() will be called for them anyway.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Make io_req_find_next() and io_req_link_next() to accept only non-null
nxt, and handle it in callers.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

There is only one one-liner user of io_free_req_find_next(). Inline it.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

The number of SQEs to submit is specified by a user, so io_get_sqring()
in most of the cases succeeds. Hint compilers about that.

Checking ASM genereted by gcc 9.2.0 for x64, there is one branch
misprediction.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

__io_submit_sqe() is issuing requests, so call it as
such. Moreover, it ends by calling io_iopoll_req_issued().

Rename it and make terminology clearer.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We don't have shadow requests anymore, so get rid of the shadow
argument. Add the user_data argument, as that's often useful to easily
match up requests, instead of having to look at request pointers.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

There's an issue with the shadow drain logic in that we drop the
completion lock after deciding to defer a request, then re-grab it later
and assume that the state is still the same. In the mean time, someone
else completing a request could have found and issued it. This can cause
a stall in the queue, by having a shadow request inserted that nobody is
going to drain.

Additionally, if we fail allocating the shadow request, we simply ignore
the drain.

Instead of using a shadow request, defer the next request/link instead.
This also has the following advantages:

- removes semi-duplicated code
- doesn't allocate memory for shadows
- works better if only the head marked for drain
- doesn't need complex synchronisation

On the flip side, it removes the shadow->seq ==
last_drain_in_in_link->seq optimization. That shouldn't be a common
case, and can always be added back, if needed.

Fixes: 4fe2c963 ("io_uring: add support for link with drain")
Cc: Jackie Liu <liuyun01@kylinos.cn>
Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

When we find new work to process within the work handler, we queue the
linked timeout before we have issued the new work. This can be
problematic for very short timeouts, as we have a window where the new
work isn't visible.

Allow the work handler to store a callback function for this in the work
item, and flag it with IO_WQ_WORK_CB if the caller has done so. If that
is set, then io-wq will call the callback when it has setup the new work
item.
Reported-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We currently try and start the next link when we put the request, and
only if we were going to free it. This means that the optimization to
continue executing requests from the same context often fails, as we're
not putting the final reference.

Add REQ_F_LINK_NEXT to keep track of this, and allow io_uring to find the
next request more efficiently.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We currently rely on the ring destroy on cleaning things up in case of
failure, but io_allocate_scq_urings() can leave things half initialized
if only parts of it fails.

Be nice and return with either everything setup in success, or return an
error with things nicely cleaned up.

Reported-by: syzbot+0d818c0d39399188f393@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Always mark requests with allocated sqe and deallocate it in
__io_free_req(). It's easier to follow and doesn't add edge cases.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We currently clear the linked timeout field if we cancel such a timeout,
but we should only attempt to cancel if it's the first one we see.
Others should simply be freed like other requests, as they haven't
been started yet.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

let have a dependant link: REQ -> LINK_TIMEOUT -> LINK_TIMEOUT

1. submission stage: submission references for REQ and LINK_TIMEOUT
are dropped. So, references respectively (1,1,2)

2. io_put(REQ) + FAIL_LINKS stage: calls io_fail_links(), which for all
linked timeouts will call cancel_timeout() and drop 1 reference.
So, references after: (0,0,1). That's a leak.

Make it treat only the first linked timeout as such, and pass others
through __io_double_put_req().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Pass any IORING_OP_LINK_TIMEOUT request further, where it will
eventually fail in io_issue_sqe().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

If io_req_defer() failed, it needs to cancel a dependant link.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

These lines are indented an extra space character.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We currently have a race where if setup is really slow, we can be
calling io_wq_destroy() before we're done setting up. This will cause
the caller to get stuck waiting for the manager to set things up, but
the manager already exited.

Fix this by doing a sync setup of the manager. This also fixes the case
where if we failed creating workers, we'd also get stuck.

In practice this race window was really small, as we already wait for
the manager to start. Hence someone would have to call io_wq_destroy()
after the task has started, but before it started the first loop. The
reported test case forked tons of these, which is why it became an
issue.

Reported-by: syzbot+0f1cc17f85154f400465@syzkaller.appspotmail.com
Fixes: 771b53d0 ("io-wq: small threadpool implementation for io_uring")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We currently don't explicitly break links if a request is cancelled, but
we should. Add explicitly link breakage for all types of request
cancellations that we support.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Currently a poll request fills a completion entry of 0, even if it got
cancelled. This is odd, and it makes it harder to support with chains.
Ensure that it returns -ECANCELED in the completions events if it got
cancelled, and furthermore ensure that the linked timeout that triggered
it completes with -ETIME if we did indeed trigger the completions
through a timeout.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

With the conversion to io-wq, we no longer use that flag. Kill it.

Fixes: 561fb04a ("io_uring: replace workqueue usage with io-wq")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

We have an issue with timeout links that are deeper in the submit chain,
because we only handle it upfront, not from later submissions. Move the
prep + issue of the timeout link to the async work prep handler, and do
it normally for non-async queue. If we validate and prepare the timeout
links upfront when we first see them, there's nothing stopping us from
supporting any sort of nesting.

Fixes: 2665abfd ("io_uring: add support for linked SQE timeouts")
Reported-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

There are a few reasons for this:

- As a prep to improving the linked timeout logic
- io_timeout is the biggest member in the io_kiocb opcode union

This also enables a few cleanups, like unifying the timer setup between
IORING_OP_TIMEOUT and IORING_OP_LINK_TIMEOUT, and not needing multiple
arguments to the link/prep helpers.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

If we don't use the normal completion path, we may skip killing links
that should be errored and freed. Add __io_double_put_req() for use
within the completion path itself, other calls should just use
io_double_put_req().
Signed-off-by: Jens Axboe <axboe@kernel.dk>

__io_queue_sqe(), io_queue_sqe(), io_queue_link_head() all return 0/err,
but the caller doesn't care since the errors are handled inline. Clean
these up and just make them void.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

If we have a linked request, this enables us to pass it back directly
without having to go through async context.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Pull EDAC updates from Borislav Petkov:
 "A lot of changes this time around, details below.

  From the next cycle onwards, we'll switch the EDAC tree to topic
  branches (instead of a single edac-for-next branch) which should make
  the changes handling more flexible, hopefully. We'll see.

  Summary:

   - Rework error logging functions to accept a count of errors
     parameter (Hanna Hawa)

   - Part one of substantial EDAC core + ghes_edac driver cleanup
     (Robert Richter)

   - Print additional useful logging information in skx_* (Tony Luck)

   - Improve amd64_edac hw detection + cleanups (Yazen Ghannam)

   - Misc cleanups, fixes and code improvements"

* tag 'edac_for_5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras: (35 commits)
  EDAC/altera: Use the Altera System Manager driver
  EDAC/altera: Cleanup the ECC Manager
  EDAC/altera: Use fast register IO for S10 IRQs
  EDAC/ghes: Do not warn when incrementing refcount on 0
  EDAC/Documentation: Describe CPER module definition and DIMM ranks
  EDAC: Unify the mc_event tracepoint call
  EDAC/ghes: Remove intermediate buffer pvt->detail_location
  EDAC/ghes: Fix grain calculation
  EDAC/ghes: Use standard kernel macros for page calculations
  EDAC: Remove misleading comment in struct edac_raw_error_desc
  EDAC/mc: Reduce indentation level in edac_mc_handle_error()
  EDAC/mc: Remove needless zero string termination
  EDAC/mc: Do not BUG_ON() in edac_mc_alloc()
  EDAC: Introduce an mci_for_each_dimm() iterator
  EDAC: Remove EDAC_DIMM_OFF() macro
  EDAC: Replace EDAC_DIMM_PTR() macro with edac_get_dimm() function
  EDAC/amd64: Get rid of the ECC disabled long message
  EDAC/ghes: Fix locking and memory barrier issues
  EDAC/amd64: Check for memory before fully initializing an instance
  EDAC/amd64: Use cached data when checking for ECC
  ...

Pull KVM updates from Paolo Bonzini:
 "ARM:
   - data abort report and injection
   - steal time support
   - GICv4 performance improvements
   - vgic ITS emulation fixes
   - simplify FWB handling
   - enable halt polling counters
   - make the emulated timer PREEMPT_RT compliant

  s390:
   - small fixes and cleanups
   - selftest improvements
   - yield improvements

  PPC:
   - add capability to tell userspace whether we can single-step the
     guest
   - improve the allocation of XIVE virtual processor IDs
   - rewrite interrupt synthesis code to deliver interrupts in virtual
     mode when appropriate.
   - minor cleanups and improvements.

  x86:
   - XSAVES support for AMD
   - more accurate report of nested guest TSC to the nested hypervisor
   - retpoline optimizations
   - support for nested 5-level page tables
   - PMU virtualization optimizations, and improved support for nested
     PMU virtualization
   - correct latching of INITs for nested virtualization
   - IOAPIC optimization
   - TSX_CTRL virtualization for more TAA happiness
   - improved allocation and flushing of SEV ASIDs
   - many bugfixes and cleanups"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (127 commits)
  kvm: nVMX: Relax guest IA32_FEATURE_CONTROL constraints
  KVM: x86: Grab KVM's srcu lock when setting nested state
  KVM: x86: Open code shared_msr_update() in its only caller
  KVM: Fix jump label out_free_* in kvm_init()
  KVM: x86: Remove a spurious export of a static function
  KVM: x86: create mmu/ subdirectory
  KVM: nVMX: Remove unnecessary TLB flushes on L1<->L2 switches when L1 use apic-access-page
  KVM: x86: remove set but not used variable 'called'
  KVM: nVMX: Do not mark vmcs02->apic_access_page as dirty when unpinning
  KVM: vmx: use MSR_IA32_TSX_CTRL to hard-disable TSX on guest that lack it
  KVM: vmx: implement MSR_IA32_TSX_CTRL disable RTM functionality
  KVM: x86: implement MSR_IA32_TSX_CTRL effect on CPUID
  KVM: x86: do not modify masked bits of shared MSRs
  KVM: x86: fix presentation of TSX feature in ARCH_CAPABILITIES
  KVM: PPC: Book3S HV: XIVE: Fix potential page leak on error path
  KVM: PPC: Book3S HV: XIVE: Free previous EQ page when setting up a new one
  KVM: nVMX: Assume TLB entries of L1 and L2 are tagged differently if L0 use EPT
  KVM: x86: Unexport kvm_vcpu_reload_apic_access_page()
  KVM: nVMX: add CR4_LA57 bit to nested CR4_FIXED1
  KVM: nVMX: Use semi-colon instead of comma for exit-handlers initialization
  ...

Pull xen updates from Juergen Gross:

 - a small series to remove the build constraint of Xen x86 MCE handling
   to 64-bit only

 - a bunch of minor cleanups

* tag 'for-linus-5.5a-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: Fix Kconfig indentation
  xen/mcelog: also allow building for 32-bit kernels
  xen/mcelog: add PPIN to record when available
  xen/mcelog: drop __MC_MSR_MCGCAP
  xen/gntdev: Use select for DMA_SHARED_BUFFER
  xen: mm: make xen_mm_init static
  xen: mm: include <xen/xen-ops.h> for missing declarations

Pull MIPS updates from Paul Burton:
 "The main MIPS changes for 5.5:

   - Atomics-related code sees some rework & cleanup, most notably
     allowing Loongson LL/SC errata workarounds to be more bulletproof &
     their correctness to be checked at build time.

   - Command line setup code is simplified somewhat, resolving various
     corner cases.

   - MIPS kernels can now be built with kcov code coverage support.

   - We can now build with CONFIG_FORTIFY_SOURCE=y.

   - Miscellaneous cleanups.

  And some platform specific changes:

   - We now disable some broken TLB functionality on certain Ingenic
     systems, and JZ4780 systems gain some devicetree nodes to support
     more devices.

   - Loongson support sees a number of cleanups, and we gain initial
     support for Loongson 3A R4 systems.

   - We gain support for MediaTek MT7688-based GARDENA Smart Gateway
     systems.

   - SGI IP27 (Origin 2*) see a number of fixes, cleanups &
     simplifications.

   - SGI IP30 (Octane) systems are now supported"

* tag 'mips_5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (107 commits)
  MIPS: SGI-IP27: Enable ethernet phy on second Origin 200 module
  MIPS: PCI: Fix fake subdevice ID for IOC3
  MIPS: Ingenic: Disable abandoned HPTLB function.
  MIPS: PCI: remember nasid changed by set interrupt affinity
  MIPS: SGI-IP27: Fix crash, when CPUs are disabled via nr_cpus parameter
  mips: add support for folded p4d page tables
  mips: drop __pXd_offset() macros that duplicate pXd_index() ones
  mips: fix build when "48 bits virtual memory" is enabled
  MIPS: math-emu: Reuse name array in debugfs_fpuemu()
  MIPS: allow building with kcov coverage
  MIPS: Loongson64: Drop setup_pcimap
  MIPS: Loongson2ef: Convert to early_printk_8250
  MIPS: Drop CPU_SUPPORTS_UNCACHED_ACCELERATED
  MIPS: Loongson{2ef, 32, 64} convert to generic fw cmdline
  MIPS: Drop pmon.h
  MIPS: Loongson: Unify LOONGSON3/LOONGSON64 Kconfig usage
  MIPS: Loongson: Rename LOONGSON1 to LOONGSON32
  MIPS: Loongson: Fix return value of loongson_hwmon_init
  MIPS: add support for SGI Octane (IP30)
  MIPS: PCI: make phys_to_dma/dma_to_phys for pci-xtalk-bridge common
  ...

Pull m68k updates from Geert Uytterhoeven:

 - Atari Falcon IDE platform driver conversion for module autoload

 - defconfig updates (including enablement of Amiga ICY I2C)

 - small fixes and cleanups

* tag 'm68k-for-v5.5-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  m68k/atari: Convert Falcon IDE drivers to platform drivers
  m68k: defconfig: Enable ICY I2C and LTC2990 on Amiga
  m68k: defconfig: Update defconfigs for v5.4-rc1
  m68k: q40: Fix info-leak in rtc_ioctl
  nubus: Remove cast to void pointer

Pull RAS updates from Borislav Petkov:

 - Fully reworked thermal throttling notifications, there should be no
   more spamming of dmesg (Srinivas Pandruvada and Benjamin Berg)

 - More enablement for the Intel-compatible CPUs Zhaoxin (Tony W
   Wang-oc)

 - PPIN support for Icelake (Tony Luck)

* 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mce/therm_throt: Optimize notifications of thermal throttle
  x86/mce: Add Xeon Icelake to list of CPUs that support PPIN
  x86/mce: Lower throttling MCE messages' priority to warning
  x86/mce: Add Zhaoxin LMCE support
  x86/mce: Add Zhaoxin CMCI support
  x86/mce: Add Zhaoxin MCE support
  x86/mce/amd: Make disable_err_thresholding() static

Pull x86 microcode updates from Borislav Petkov:
 "This converts the late loading method to load the microcode in
  parallel (vs sequentially currently). The patch remained in linux-next
  for the maximum amount of time so that any potential and hard to debug
  fallout be minimized.

  Now cloud folks have their milliseconds back but all the normal people
  should use early loading anyway :-)"

* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/microcode/intel: Issue the revision updated message only on the BSP
  x86/microcode: Update late microcode in parallel
  x86/microcode/amd: Fix two -Wunused-but-set-variable warnings

Pull s390 updates from Vasily Gorbik:

 - Adjust PMU device drivers registration to avoid WARN_ON and few other
   perf improvements.

 - Enhance tracing in vfio-ccw.

 - Few stack unwinder fixes and improvements, convert get_wchan custom
   stack unwinding to generic api usage.

 - Fixes for mm helpers issues uncovered with tests validating
   architecture page table helpers.

 - Fix noexec bit handling when hardware doesn't support it.

 - Fix memleak and unsigned value compared with zero bugs in crypto
   code. Minor code simplification.

 - Fix crash during kdump with kasan enabled kernel.

 - Switch bug and alternatives from asm to asm_inline to improve
   inlining decisions.

 - Use 'depends on cc-option' for MARCH and TUNE options in Kconfig, add
   z13s and z14 ZR1 to TUNE descriptions.

 - Minor head64.S simplification.

 - Fix physical to logical CPU map for SMT.

 - Several cleanups in qdio code.

 - Other minor cleanups and fixes all over the code.

* tag 's390-5.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (41 commits)
  s390/cpumf: Adjust registration of s390 PMU device drivers
  s390/smp: fix physical to logical CPU map for SMT
  s390/early: move access registers setup in C code
  s390/head64: remove unnecessary vdso_per_cpu_data setup
  s390/early: move control registers setup in C code
  s390/kasan: support memcpy_real with TRACE_IRQFLAGS
  s390/crypto: Fix unsigned variable compared with zero
  s390/pkey: use memdup_user() to simplify code
  s390/pkey: fix memory leak within _copy_apqns_from_user()
  s390/disassembler: don't hide instruction addresses
  s390/cpum_sf: Assign error value to err variable
  s390/cpum_sf: Replace function name in debug statements
  s390/cpum_sf: Use consistant debug print format for sampling
  s390/unwind: drop unnecessary code around calling ftrace_graph_ret_addr()
  s390: add error handling to perf_callchain_kernel
  s390: always inline current_stack_pointer()
  s390/mm: add mm_pxd_folded() checks to pxd_free()
  s390/mm: properly clear _PAGE_NOEXEC bit when it is not supported
  s390/mm: simplify page table helpers for large entries
  s390/mm: make pmd/pud_bad() report large entries as bad
  ...

Pull arm64 updates from Catalin Marinas:
 "Apart from the arm64-specific bits (core arch and perf, new arm64
  selftests), it touches the generic cow_user_page() (reviewed by
  Kirill) together with a macro for x86 to preserve the existing
  behaviour on this architecture.

  Summary:

   - On ARMv8 CPUs without hardware updates of the access flag, avoid
     failing cow_user_page() on PFN mappings if the pte is old. The
     patches introduce an arch_faults_on_old_pte() macro, defined as
     false on x86. When true, cow_user_page() makes the pte young before
     attempting __copy_from_user_inatomic().

   - Covert the synchronous exception handling paths in
     arch/arm64/kernel/entry.S to C.

   - FTRACE_WITH_REGS support for arm64.

   - ZONE_DMA re-introduced on arm64 to support Raspberry Pi 4

   - Several kselftest cases specific to arm64, together with a
     MAINTAINERS update for these files (moved to the ARM64 PORT entry).

   - Workaround for a Neoverse-N1 erratum where the CPU may fetch stale
     instructions under certain conditions.

   - Workaround for Cortex-A57 and A72 errata where the CPU may
     speculatively execute an AT instruction and associate a VMID with
     the wrong guest page tables (corrupting the TLB).

   - Perf updates for arm64: additional PMU topologies on HiSilicon
     platforms, support for CCN-512 interconnect, AXI ID filtering in
     the IMX8 DDR PMU, support for the CCPI2 uncore PMU in ThunderX2.

   - GICv3 optimisation to avoid a heavy barrier when accessing the
     ICC_PMR_EL1 register.

   - ELF HWCAP documentation updates and clean-up.

   - SMC calling convention conduit code clean-up.

   - KASLR diagnostics printed during boot

   - NVIDIA Carmel CPU added to the KPTI whitelist

   - Some arm64 mm clean-ups: use generic free_initrd_mem(), remove
     stale macro, simplify calculation in __create_pgd_mapping(), typos.

   - Kconfig clean-ups: CMDLINE_FORCE to depend on CMDLINE, choice for
     endinanness to help with allmodconfig"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (93 commits)
  arm64: Kconfig: add a choice for endianness
  kselftest: arm64: fix spelling mistake "contiguos" -> "contiguous"
  arm64: Kconfig: make CMDLINE_FORCE depend on CMDLINE
  MAINTAINERS: Add arm64 selftests to the ARM64 PORT entry
  arm64: kaslr: Check command line before looking for a seed
  arm64: kaslr: Announce KASLR status on boot
  kselftest: arm64: fake_sigreturn_misaligned_sp
  kselftest: arm64: fake_sigreturn_bad_size
  kselftest: arm64: fake_sigreturn_duplicated_fpsimd
  kselftest: arm64: fake_sigreturn_missing_fpsimd
  kselftest: arm64: fake_sigreturn_bad_size_for_magic0
  kselftest: arm64: fake_sigreturn_bad_magic
  kselftest: arm64: add helper get_current_context
  kselftest: arm64: extend test_init functionalities
  kselftest: arm64: mangle_pstate_invalid_mode_el[123][ht]
  kselftest: arm64: mangle_pstate_invalid_daif_bits
  kselftest: arm64: mangle_pstate_invalid_compat_toggle and common utils
  kselftest: arm64: extend toplevel skeleton Makefile
  drivers/perf: hisi: update the sccl_id/ccl_id for certain HiSilicon platform
  arm64: mm: reserve CMA and crashkernel in ZONE_DMA32
  ...

Merge tag 'linux-kselftest-5.5-rc1-kunit' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kselftest KUnit support gtom Shuah Khan:
 "This adds KUnit, a lightweight unit testing and mocking framework for
  the Linux kernel from Brendan Higgins.

  KUnit is not an end-to-end testing framework. It is currently
  supported on UML and sub-systems can write unit tests and run them in
  UML env. KUnit documentation is included in this update.

  In addition, this Kunit update adds 3 new kunit tests:

   - proc sysctl test from Iurii Zaikin

   - the 'list' doubly linked list test from David Gow

   - ext4 tests for decoding extended timestamps from Iurii Zaikin

  In the future KUnit will be linked to Kselftest framework to provide a
  way to trigger KUnit tests from user-space"

* tag 'linux-kselftest-5.5-rc1-kunit' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (23 commits)
  lib/list-test: add a test for the 'list' doubly linked list
  ext4: add kunit test for decoding extended timestamps
  Documentation: kunit: Fix verification command
  kunit: Fix '--build_dir' option
  kunit: fix failure to build without printk
  MAINTAINERS: add proc sysctl KUnit test to PROC SYSCTL section
  kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()
  MAINTAINERS: add entry for KUnit the unit testing framework
  Documentation: kunit: add documentation for KUnit
  kunit: defconfig: add defconfigs for building KUnit tests
  kunit: tool: add Python wrappers for running KUnit tests
  kunit: test: add tests for KUnit managed resources
  kunit: test: add the concept of assertions
  kunit: test: add tests for kunit test abort
  kunit: test: add support for test abort
  objtool: add kunit_try_catch_throw to the noreturn list
  kunit: test: add initial tests
  lib: enable building KUnit in lib/
  kunit: test: add the concept of expectations
  kunit: test: add assertion printing library
  ...

Merge tag 'linux-kselftest-5.5-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull kselftest fixes from Shuah Khan:
 "This consists of several fixes to tests and framework.

  Masami Hiramatsu fixed several tests to build and run correctly on arm
  and other 32bit architectures"

* tag 'linux-kselftest-5.5-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  selftests: sync: Fix cast warnings on arm
  selftests: net: Fix printf format warnings on arm
  selftests: net: Use size_t and ssize_t for counting file size
  selftests: vm: Build/Run 64bit tests only on 64bit arch
  selftests: proc: Make va_max 1MB
  kselftest: Fix NULL INSTALL_PATH for TARGETS runlist
  selftests: Move kselftest_module.sh into kselftest/
  selftests: gen_kselftest_tar.sh: Do not clobber kselftest/
  selftests: breakpoints: Fix a typo of function name
  selftests: Fix O= and KBUILD_OUTPUT handling for relative paths

Pull fsverity updates from Eric Biggers:
 "Expose the fs-verity bit through statx()"

* tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt:
  docs: fs-verity: mention statx() support
  f2fs: support STATX_ATTR_VERITY
  ext4: support STATX_ATTR_VERITY
  statx: define STATX_ATTR_VERITY
  docs: fs-verity: document first supported kernel version

Pull fscrypt updates from Eric Biggers:

 - Add the IV_INO_LBLK_64 encryption policy flag which modifies the
   encryption to be optimized for UFS inline encryption hardware.

 - For AES-128-CBC, use the crypto API's implementation of ESSIV (which
   was added in 5.4) rather than doing ESSIV manually.

 - A few other cleanups.

* tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt:
  f2fs: add support for IV_INO_LBLK_64 encryption policies
  ext4: add support for IV_INO_LBLK_64 encryption policies
  fscrypt: add support for IV_INO_LBLK_64 policies
  fscrypt: avoid data race on fscrypt_mode::logged_impl_name
  docs: ioctl-number: document fscrypt ioctl numbers
  fscrypt: zeroize fscrypt_info before freeing
  fscrypt: remove struct fscrypt_ctx
  fscrypt: invoke crypto API for ESSIV handling

Pull AFFS updates from David Sterba:
 "A minor bugfix and cleanup for AFFS"

* tag 'affs-for-5.5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  affs: fix a memory leak in affs_remount
  affs: Replace binary semaphores with mutexes

Pull btrfs updates from David Sterba:
 "User visible changes:
   - new block group profiles: RAID1 with 3- and 4- copies
       - RAID1 in btrfs has always 2 copies, now add support for 3 and 4
       - this is an incompat feature (named RAID1C34)
       - recommended use of RAID1C3 is replacement of RAID6 profile on
         metadata, this brings a more reliable resiliency against 2
         device loss/damage

   - support for new checksums
       - per-filesystem, set at mkfs time
       - fast hash (crc32c successor): xxhash, 64bit digest
       - strong hashes (both 256bit): sha256 (slower, FIPS), blake2b
         (faster)
       - the blake2b module goes via the crypto tree, btrfs.ko has a
         soft dependency

   - speed up lseek, don't take inode locks unnecessarily, this can
     speed up parallel SEEK_CUR/SEEK_SET/SEEK_END by 80%

   - send:
       - allow clone operations within the same file
       - limit maximum number of sent clone references to avoid slow
         backref walking

   - error message improvements: device scan prints process name and PID

  Core changes:
   - cleanups
       - remove unique workqueue helpers, used to provide a way to avoid
         deadlocks in the workqueue code, now done in a simpler way
       - remove lots of indirect function calls in compression code
       - extent IO tree code moved out of extent_io.c
       - cleanup backup superblock handling at mount time
       - transaction life cycle documentation and cleanups
       - locking code cleanups, annotations and documentation
       - add more cold, const, pure function attributes
       - removal of unused or redundant struct members or variables

   - new tree-checker sanity tests
       - try to detect missing INODE_ITEM, cross-reference checks of
         DIR_ITEM, DIR_INDEX, INODE_REF, and XATTR_* items

   - remove own bio scheduling code (used to avoid checksum submissions
     being stuck behind other IO), replaced by cgroup controller-based
     code to allow better control and avoid priority inversions in cases
     where the custom and cgroup scheduling disagreed

  Fixes:
   - avoid getting stuck during cyclic writebacks

   - fix trimming of ranges crossing block group boundaries

   - fix rename exchange on subvolumes, all involved subvolumes need to
     be recorded in the transaction"

* tag 'for-5.5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (137 commits)
  btrfs: drop bdev argument from submit_extent_page
  btrfs: remove extent_map::bdev
  btrfs: drop bio_set_dev where not needed
  btrfs: get bdev directly from fs_devices in submit_extent_page
  btrfs: record all roots for rename exchange on a subvol
  Btrfs: fix block group remaining RO forever after error during device replace
  btrfs: scrub: Don't check free space before marking a block group RO
  btrfs: change btrfs_fs_devices::rotating to bool
  btrfs: change btrfs_fs_devices::seeding to bool
  btrfs: rename btrfs_block_group_cache
  btrfs: block-group: Reuse the item key from caller of read_one_block_group()
  btrfs: block-group: Refactor btrfs_read_block_groups()
  btrfs: document extent buffer locking
  btrfs: access eb::blocking_writers according to ACCESS_ONCE policies
  btrfs: set blocking_writers directly, no increment or decrement
  btrfs: merge blocking_writers branches in btrfs_tree_read_lock
  btrfs: drop incompat bit for raid1c34 after last block group is gone
  btrfs: add incompat for raid1 with 3, 4 copies
  btrfs: add support for 4-copy replication (raid1c4)
  btrfs: add support for 3-copy replication (raid1c3)
  ...