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Pull block updates from Jens Axboe:
- Improve the type checking of request flags (Bart)
- Ensure queue mapping for a single queues always picks the right queue
(Bart)
- Sanitize the io priority handling (Jan)
- rq-qos race fix (Jinke)
- Reserved tags handling improvements (John)
- Separate memory alignment from file/disk offset aligment for O_DIRECT
(Keith)
- Add new ublk driver, userspace block driver using io_uring for
communication with the userspace backend (Ming)
- Use try_cmpxchg() to cleanup the code in various spots (Uros)
- Finally remove bdevname() (Christoph)
- Clean up the zoned device handling (Christoph)
- Clean up independent access range support (Christoph)
- Clean up and improve block sysfs handling (Christoph)
- Clean up and improve teardown of block devices.
This turns the usual two step process into something that is simpler
to implement and handle in block drivers (Christoph)
- Clean up chunk size handling (Christoph)
- Misc cleanups and fixes (Bart, Bo, Dan, GuoYong, Jason, Keith, Liu,
Ming, Sebastian, Yang, Ying)
* tag 'for-5.20/block-2022-07-29' of git://git.kernel.dk/linux-block: (178 commits)
ublk_drv: fix double shift bug
ublk_drv: make sure that correct flags(features) returned to userspace
ublk_drv: fix error handling of ublk_add_dev
ublk_drv: fix lockdep warning
block: remove __blk_get_queue
block: call blk_mq_exit_queue from disk_release for never added disks
blk-mq: fix error handling in __blk_mq_alloc_disk
ublk: defer disk allocation
ublk: rewrite ublk_ctrl_get_queue_affinity to not rely on hctx->cpumask
ublk: fold __ublk_create_dev into ublk_ctrl_add_dev
ublk: cleanup ublk_ctrl_uring_cmd
ublk: simplify ublk_ch_open and ublk_ch_release
ublk: remove the empty open and release block device operations
ublk: remove UBLK_IO_F_PREFLUSH
ublk: add a MAINTAINERS entry
block: don't allow the same type rq_qos add more than once
mmc: fix disk/queue leak in case of adding disk failure
ublk_drv: fix an IS_ERR() vs NULL check
ublk: remove UBLK_IO_F_INTEGRITY
ublk_drv: remove unneeded semicolon
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git://git.kernel.dk/linux-block
Pull io_uring zerocopy support from Jens Axboe:
"This adds support for efficient support for zerocopy sends through
io_uring. Both ipv4 and ipv6 is supported, as well as both TCP and
UDP.
The core network changes to support this is in a stable branch from
Jakub that both io_uring and net-next has pulled in, and the io_uring
changes are layered on top of that.
All of the work has been done by Pavel"
* tag 'for-5.20/io_uring-zerocopy-send-2022-07-29' of git://git.kernel.dk/linux-block: (34 commits)
io_uring: notification completion optimisation
io_uring: export req alloc from core
io_uring/net: use unsigned for flags
io_uring/net: make page accounting more consistent
io_uring/net: checks errors of zc mem accounting
io_uring/net: improve io_get_notif_slot types
selftests/io_uring: test zerocopy send
io_uring: enable managed frags with register buffers
io_uring: add zc notification flush requests
io_uring: rename IORING_OP_FILES_UPDATE
io_uring: flush notifiers after sendzc
io_uring: sendzc with fixed buffers
io_uring: allow to pass addr into sendzc
io_uring: account locked pages for non-fixed zc
io_uring: wire send zc request type
io_uring: add notification slot registration
io_uring: add rsrc referencing for notifiers
io_uring: complete notifiers in tw
io_uring: cache struct io_notif
io_uring: add zc notification infrastructure
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git://git.kernel.dk/linux-block
Pull io_uring buffered writes support from Jens Axboe:
"This contains support for buffered writes, specifically for XFS. btrfs
is in progress, will be coming in the next release.
io_uring does support buffered writes on any file type, but since the
buffered write path just always -EAGAIN (or -EOPNOTSUPP) any attempt
to do so if IOCB_NOWAIT is set, any buffered write will effectively be
handled by io-wq offload. This isn't very efficient, and we even have
specific code in io-wq to serialize buffered writes to the same inode
to avoid further inefficiencies with thread offload.
This is particularly sad since most buffered writes don't block, they
simply copy data to a page and dirty it. With this pull request, we
can handle buffered writes a lot more effiently.
If balance_dirty_pages() needs to block, we back off on writes as
indicated.
This improves buffered write support by 2-3x.
Jan Kara helped with the mm bits for this, and Stefan handled the
fs/iomap/xfs/io_uring parts of it"
* tag 'for-5.20/io_uring-buffered-writes-2022-07-29' of git://git.kernel.dk/linux-block:
mm: honor FGP_NOWAIT for page cache page allocation
xfs: Add async buffered write support
xfs: Specify lockmode when calling xfs_ilock_for_iomap()
io_uring: Add tracepoint for short writes
io_uring: fix issue with io_write() not always undoing sb_start_write()
io_uring: Add support for async buffered writes
fs: Add async write file modification handling.
fs: Split off inode_needs_update_time and __file_update_time
fs: add __remove_file_privs() with flags parameter
fs: add a FMODE_BUF_WASYNC flags for f_mode
iomap: Return -EAGAIN from iomap_write_iter()
iomap: Add async buffered write support
iomap: Add flags parameter to iomap_page_create()
mm: Add balance_dirty_pages_ratelimited_flags() function
mm: Move updates of dirty_exceeded into one place
mm: Move starting of background writeback into the main balancing loop
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Pull io_uring updates from Jens Axboe:
- As per (valid) complaint in the last merge window, fs/io_uring.c has
grown quite large these days. io_uring isn't really tied to fs
either, as it supports a wide variety of functionality outside of
that.
Move the code to io_uring/ and split it into files that either
implement a specific request type, and split some code into helpers
as well. The code is organized a lot better like this, and io_uring.c
is now < 4K LOC (me).
- Deprecate the epoll_ctl opcode. It'll still work, just trigger a
warning once if used. If we don't get any complaints on this, and I
don't expect any, then we can fully remove it in a future release
(me).
- Improve the cancel hash locking (Hao)
- kbuf cleanups (Hao)
- Efficiency improvements to the task_work handling (Dylan, Pavel)
- Provided buffer improvements (Dylan)
- Add support for recv/recvmsg multishot support. This is similar to
the accept (or poll) support for have for multishot, where a single
SQE can trigger everytime data is received. For applications that
expect to do more than a few receives on an instantiated socket, this
greatly improves efficiency (Dylan).
- Efficiency improvements for poll handling (Pavel)
- Poll cancelation improvements (Pavel)
- Allow specifiying a range for direct descriptor allocations (Pavel)
- Cleanup the cqe32 handling (Pavel)
- Move io_uring types to greatly cleanup the tracing (Pavel)
- Tons of great code cleanups and improvements (Pavel)
- Add a way to do sync cancelations rather than through the sqe -> cqe
interface, as that's a lot easier to use for some use cases (me).
- Add support to IORING_OP_MSG_RING for sending direct descriptors to a
different ring. This avoids the usually problematic SCM case, as we
disallow those. (me)
- Make the per-command alloc cache we use for apoll generic, place
limits on it, and use it for netmsg as well (me).
- Various cleanups (me, Michal, Gustavo, Uros)
* tag 'for-5.20/io_uring-2022-07-29' of git://git.kernel.dk/linux-block: (172 commits)
io_uring: ensure REQ_F_ISREG is set async offload
net: fix compat pointer in get_compat_msghdr()
io_uring: Don't require reinitable percpu_ref
io_uring: fix types in io_recvmsg_multishot_overflow
io_uring: Use atomic_long_try_cmpxchg in __io_account_mem
io_uring: support multishot in recvmsg
net: copy from user before calling __get_compat_msghdr
net: copy from user before calling __copy_msghdr
io_uring: support 0 length iov in buffer select in compat
io_uring: fix multishot ending when not polled
io_uring: add netmsg cache
io_uring: impose max limit on apoll cache
io_uring: add abstraction around apoll cache
io_uring: move apoll cache to poll.c
io_uring: consolidate hash_locked io-wq handling
io_uring: clear REQ_F_HASH_LOCKED on hash removal
io_uring: don't race double poll setting REQ_F_ASYNC_DATA
io_uring: don't miss setting REQ_F_DOUBLE_POLL
io_uring: disable multishot recvmsg
io_uring: only trace one of complete or overflow
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rx_callback is a standard mailbox callback mechanism and could cover the
function of proprietary cmdq_task_cb, so use the standard one instead of
the proprietary one. Client driver has changed to use standard
rx_callback, so remove proprietary cmdq_task_cb.
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
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into clk-next
- Remove allwinner workaround logic/compatible in fixed factor code
- MediaTek clk driver cleanups
- Add reset support to more MediaTek clk drivers
- devm helpers for clk_get() + clk_prepare() and clk_enable()
* clk-basic:
clk: fixed-factor: Introduce *clk_hw_register_fixed_factor_parent_hw()
clk: mux: Introduce devm_clk_hw_register_mux_parent_hws()
clk: divider: Introduce devm_clk_hw_register_divider_parent_hw()
dt-bindings: clock: fixed-factor: Drop Allwinner A10 compatible
clk: fixed: Remove Allwinner A10 special-case logic
* clk-mtk:
clk: mediatek: reset: Add infra_ao reset support for MT8186
dt-bindings: arm: mediatek: Add #reset-cells property for MT8186
dt-bindings: reset: mediatek: Add infra_ao reset index for MT8186
clk: mediatek: reset: Add infra_ao reset support for MT8192/MT8195
dt-bindings: reset: mediatek: Add infra_ao reset index for MT8192/MT8195
dt-bindings: arm: mediatek: Add #reset-cells property for MT8192/MT8195
clk: mediatek: reset: Add reset support for simple probe
clk: mediatek: reset: Add new register reset function with device
clk: mediatek: reset: Change return type for clock reset register function
clk: mediatek: reset: Support inuput argument index mode
clk: mediatek: reset: Support nonsequence base offsets of reset registers
clk: mediatek: reset: Revise structure to control reset register
clk: mediatek: reset: Merge and revise reset register function
clk: mediatek: reset: Extract common drivers to update function
clk: mediatek: reset: Refine and reorder functions in reset.c
clk: mediatek: reset: Fix written reset bit offset
clk: mediatek: reset: Add reset.h
clk: mediatek: Delete MT8192 msdc gate
dt-bindings: ARM: Mediatek: Remove msdc binding of MT8192 clock
* clk-devm-enable:
clk: Remove never used devm_clk_*unregister()
clk: Fix pointer casting to prevent oops in devm_clk_release()
clk: meson: axg-audio: Don't duplicate devm_clk_get_enabled()
clk: Provide new devm_clk helpers for prepared and enabled clocks
clk: generalize devm_clk_get() a bit
clk: Improve documentation for devm_clk_get() and its optional variant
* clk-ti-dt:
clk: ti: Stop using legacy clkctrl names for omap4 and 5
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When reading this note, CONFIG_TRACEPOINT searches my configuration
file, and the result is CONFIG_TRACEPOINTS, the search results are
consistent with the following macro definitions. I think it should be
repaired.
Link: https://lkml.kernel.org/r/20220721081904.3798-1-zeming@nfschina.com
Signed-off-by: Li zeming <zeming@nfschina.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull thermal control updates from Rafael Wysocki:
"These start a rework of the handling of trip points in the thermal
core, improve the cpufreq/devfreq cooling device handling, update some
thermal control drivers and the tmon utility and clean up code.
Specifics:
- Consolidate the thermal core code by beginning to move the thermal
trip structure from the thermal OF code as a generic structure to
be used by the different sensors when registering a thermal zone
(Daniel Lezcano).
- Make per cpufreq / devfreq cooling device ops instead of using a
global variable, fix comments and rework the trace information
(Lukasz Luba).
- Add the include/dt-bindings/thermal.h under the area covered by the
thermal maintainer in the MAINTAINERS file (Lukas Bulwahn).
- Improve the error output by giving the sensor identification when a
thermal zone failed to initialize, the DT bindings by changing the
positive logic and adding the r8a779f0 support on the rcar3
(Wolfram Sang).
- Convert the QCom tsens DT binding to the dtsformat format
(Krzysztof Kozlowski).
- Remove the pointless get_trend() function in the QCom, Ux500 and
tegra thermal drivers, along with the unused DROP_FULL and
RAISE_FULL trends definitions. Simplify the code by using clamp()
macros (Daniel Lezcano).
- Fix ref_table memory leak at probe time on the k3_j72xx bandgap
(Bryan Brattlof).
- Fix array underflow in prep_lookup_table (Dan Carpenter).
- Add static annotation to the k3_j72xx_bandgap_j7* data structure
(Jin Xiaoyun).
- Fix typos in comments detected on sun8i by Coccinelle (Julia
Lawall).
- Fix typos in comments on rzg2l (Biju Das).
- Remove as unnecessary call to dev_err() as the error is already
printed by the failing function on u8500 (Yang Li).
- Register the thermal zones as hwmon sensors for the Qcom thermal
sensors (Dmitry Baryshkov).
- Fix 'tmon' tool compilation issue by adding phtread.h include
(Markus Mayer).
- Fix typo in the comments for the 'tmon' tool (Slark Xiao).
- Make the thermal core use ida_alloc()/free() directly instead of
ida_simple_get()/ida_simple_remove() that have been deprecated
(keliu).
- Drop ACPI_FADT_LOW_POWER_S0 check from the Intel PCH thermal
control driver (Rafael Wysocki)"
* tag 'thermal-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (39 commits)
thermal/of: Initialize trip points separately
thermal/of: Use thermal trips stored in the thermal zone
thermal/core: Add thermal_trip in thermal_zone
thermal/core: Rename 'trips' to 'num_trips'
thermal/core: Move thermal_set_delay_jiffies to static
thermal/core: Remove unneeded EXPORT_SYMBOLS
thermal/of: Move thermal_trip structure to thermal.h
thermal/of: Remove the device node pointer for thermal_trip
thermal/of: Replace device node match with device node search
thermal/core: Remove duplicate information when an error occurs
thermal/core: Avoid calling ->get_trip_temp() unnecessarily
thermal/tools/tmon: Fix typo 'the the' in comment
thermal/tools/tmon: Include pthread and time headers in tmon.h
thermal/ti-soc-thermal: Fix comment typo
thermal/drivers/qcom/spmi-adc-tm5: Register thermal zones as hwmon sensors
thermal/drivers/qcom/temp-alarm: Register thermal zones as hwmon sensors
thermal/drivers/u8500: Remove unnecessary print function dev_err()
thermal/drivers/rzg2l: Fix comments
thermal/drivers/sun8i: Fix typo in comment
thermal/drivers/k3_j72xx_bandgap: Make k3_j72xx_bandgap_j721e_data and k3_j72xx_bandgap_j7200_data static
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management updates from Rafael Wysocki:
"These are mostly minor improvements all over including new CPU IDs for
the Intel RAPL driver, an Energy Model rework to use micro-Watt as the
power unit, cpufreq fixes and cleanus, cpuidle updates, devfreq
updates, documentation cleanups and a new version of the pm-graph
suite of utilities.
Specifics:
- Make cpufreq_show_cpus() more straightforward (Viresh Kumar).
- Drop unnecessary CPU hotplug locking from store() used by cpufreq
sysfs attributes (Viresh Kumar).
- Make the ACPI cpufreq driver support the boost control interface on
Zhaoxin/Centaur processors (Tony W Wang-oc).
- Print a warning message on attempts to free an active cpufreq
policy which should never happen (Viresh Kumar).
- Fix grammar in the Kconfig help text for the loongson2 cpufreq
driver (Randy Dunlap).
- Use cpumask_var_t for an on-stack CPU mask in the ondemand cpufreq
governor (Zhao Liu).
- Add trace points for guest_halt_poll_ns grow/shrink to the haltpoll
cpuidle driver (Eiichi Tsukata).
- Modify intel_idle to treat C1 and C1E as independent idle states on
Sapphire Rapids (Artem Bityutskiy).
- Extend support for wakeirq to callback wrappers used during system
suspend and resume (Ulf Hansson).
- Defer waiting for device probe before loading a hibernation image
till the first actual device access to avoid possible deadlocks
reported by syzbot (Tetsuo Handa).
- Unify device_init_wakeup() for PM_SLEEP and !PM_SLEEP (Bjorn
Helgaas).
- Add Raptor Lake-P to the list of processors supported by the Intel
RAPL driver (George D Sworo).
- Add Alder Lake-N and Raptor Lake-P to the list of processors for
which Power Limit4 is supported in the Intel RAPL driver (Sumeet
Pawnikar).
- Make pm_genpd_remove() check genpd_debugfs_dir against NULL before
attempting to remove it (Hsin-Yi Wang).
- Change the Energy Model code to represent power in micro-Watts and
adjust its users accordingly (Lukasz Luba).
- Add new devfreq driver for Mediatek CCI (Cache Coherent
Interconnect) (Johnson Wang).
- Convert the Samsung Exynos SoC Bus bindings to DT schema of
exynos-bus.c (Krzysztof Kozlowski).
- Address kernel-doc warnings by adding the description for unused
function parameters in devfreq core (Mauro Carvalho Chehab).
- Use NULL to pass a null pointer rather than zero according to the
function propotype in imx-bus.c (Colin Ian King).
- Print error message instead of error interger value in
tegra30-devfreq.c (Dmitry Osipenko).
- Add checks to prevent setting negative frequency QoS limits for
CPUs (Shivnandan Kumar).
- Update the pm-graph suite of utilities to the latest revision 5.9
including multiple improvements (Todd Brandt).
- Drop pme_interrupt reference from the PCI power management
documentation (Mario Limonciello)"
* tag 'pm-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (27 commits)
powercap: RAPL: Add Power Limit4 support for Alder Lake-N and Raptor Lake-P
PM: QoS: Add check to make sure CPU freq is non-negative
PM: hibernate: defer device probing when resuming from hibernation
intel_idle: make SPR C1 and C1E be independent
cpufreq: ondemand: Use cpumask_var_t for on-stack cpu mask
cpufreq: loongson2: fix Kconfig "its" grammar
pm-graph v5.9
cpufreq: Warn users while freeing active policy
cpufreq: scmi: Support the power scale in micro-Watts in SCMI v3.1
firmware: arm_scmi: Get detailed power scale from perf
Documentation: EM: Switch to micro-Watts scale
PM: EM: convert power field to micro-Watts precision and align drivers
PM / devfreq: tegra30: Add error message for devm_devfreq_add_device()
PM / devfreq: imx-bus: use NULL to pass a null pointer rather than zero
PM / devfreq: shut up kernel-doc warnings
dt-bindings: interconnect: samsung,exynos-bus: convert to dtschema
PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver
dt-bindings: interconnect: Add MediaTek CCI dt-bindings
PM: domains: Ensure genpd_debugfs_dir exists before remove
PM: runtime: Extend support for wakeirq for force_suspend|resume
...
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI updates from Rafael Wysocki:
"These rework the handling of ACPI device objects to use the driver
core facilities for managing child ones instead of some questionable
home-grown ways without the requisite locking and reference counting,
clean up the EC driver, improve suspend-to-idle handling on x86, add
some systems to the ACPI backlight quirk list, fix some assorted
issues, clean up code and improve documentation.
Specifics:
- Use facilities provided by the driver core and some additional
helpers to handle the children of a given ACPI device object in
multiple places instead of using the children and node list heads
in struct acpi_device which is error prone (Rafael Wysocki).
- Fix ACPI-related device reference counting issue in the hisi_lpc
bus driver (Yang Yingliang).
- Drop the children and node list heads that are not needed any more
from struct acpi_device (Rafael Wysocki).
- Drop driver member from struct acpi_device (Uwe Kleine-König).
- Drop redundant check from acpi_device_remove() (Uwe Kleine-König).
- Prepare the CPPC library for handling backwards-compatible future
_CPC return package formats gracefully (Rafael Wysocki).
- Clean up the ACPI EC driver after previous changes in it (Hans de
Goede).
- Drop leftover acpi_processor_get_limit_info() declaration (Riwen
Lu).
- Split out thermal initialization from ACPI PSS (Riwen Lu).
- Annotate more functions in the ACPI CPU idle driver to live in the
cpuidle section (Guilherme G. Piccoli).
- Fix _EINJ vs "special purpose" EFI memory regions (Dan Williams).
- Implement a better fix to avoid spamming the console with old error
logs (Tony Luck).
- Fix typo in a comment in the APEI code (Xiang wangx).
- Save NVS memory during transitions into S3 on Lenovo G40-45 (Manyi
Li).
- Add support for upcoming AMD uPEP device ID AMDI008 to the ACPI
suspend-to-idle driver for x86 platforms (Shyam Sundar S K).
- Clean up checks related to the ACPI_FADT_LOW_POWER_S0 platform flag
in the LPIT table driver and the suspend-to-idle driver for x86
platforms (Rafael Wysocki).
- Print information messages regarding declared LPS0 idle support in
the platform firmware (Rafael Wysocki).
- Fix missing check in register_device_clock() in the ACPI driver for
Intel SoCs (huhai).
- Fix ACS setup in the VIOT table parser (Eric Auger).
- Skip IRQ override on AMD Zen platforms where it's harmful
(Chuanhong Guo).
- Use native backlight on Dell Inspiron N4010 (Hans de Goede).
- Use native backlight on some TongFang devices (Werner Sembach).
- Drop X86 dependency from the ACPI backlight driver Kconfig (Riwen
Lu).
- Shorten the quirk list in the ACPI backlight driver by identifying
Clevo by board_name only (Werner Sembach).
- Remove useless NULL pointer checks from 2 ACPI PCI link management
functions (Andrey Strachuk).
- Fix obsolete example in the ACPI EINJ documentation (Qifu Zhang).
- Update links and references to _DSD-related documents (Sudeep
Holla)"
* tag 'acpi-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (46 commits)
ACPI/PCI: Remove useless NULL pointer checks
ACPI: CPPC: Do not prevent CPPC from working in the future
ACPI: PM: x86: Print messages regarding LPS0 idle support
ACPI: resource: skip IRQ override on AMD Zen platforms
Documentation: ACPI: EINJ: Fix obsolete example
ACPI: video: Use native backlight on Dell Inspiron N4010
ACPI: PM: s2idle: Use LPS0 idle if ACPI_FADT_LOW_POWER_S0 is unset
Revert "ACPI / PM: LPIT: Register sysfs attributes based on FADT"
ACPI: video: Shortening quirk list by identifying Clevo by board_name only
ACPI: video: Force backlight native for some TongFang devices
ACPI: PM: s2idle: Add support for upcoming AMD uPEP HID AMDI008
ACPI: VIOT: Fix ACS setup
ACPI: bus: Drop unused list heads from struct acpi_device
hisi_lpc: Use acpi_dev_for_each_child()
bus: hisi_lpc: fix missing platform_device_put() in hisi_lpc_acpi_probe()
ACPI: bus: Drop driver member of struct acpi_device
ACPI: bus: Drop redundant check in acpi_device_remove()
ACPI: APEI: Fix _EINJ vs EFI_MEMORY_SP
ACPI: LPSS: Fix missing check in register_device_clock()
ACPI: APEI: Better fix to avoid spamming the console with old error logs
...
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git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
Pull pwm updates from Thierry Reding:
"After v5.19 had all drivers converted to the new atomic API and nobody
has reported any breakage, this set of changes starts by dropping the
legacy support.
Some existing drivers get improvements and broader chip support and a
new driver is added that emulates a PWM controller using a clock
output.
Other than that there's the usual bits of cleanups and minor fixes"
* tag 'pwm/for-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: (21 commits)
pwm: lpc18xx: Fix period handling
pwm: lpc18xx: Convert to use dev_err_probe()
pwm: twl-led: Document some limitations and link to the reference manual
MAINTAINERS: Remove myself as PWM maintainer
MAINTAINERS: Add include/dt-bindings/pwm to PWM SUBSYSTEM
dt-bindings: pwm: mediatek: Add compatible string for MT8195
pwm: Add clock based PWM output driver
dt-bindings: pwm: Document clk based PWM controller
pwm: sifive: Shut down hardware only after pwmchip_remove() completed
pwm: sifive: Ensure the clk is enabled exactly once per running PWM
pwm: sifive: Simplify clk handling
pwm: sifive: Enable clk only after period check in .apply()
pwm: sifive: Reduce time the controller lock is held
pwm: sifive: Fold pwm_sifive_enable() into its only caller
pwm: sifive: Simplify offset calculation for PWMCMP registers
pwm: mediatek: Add MT8365 support
dt-bindings: pwm: Add MT8365 SoC binding
pwm: Drop unused forward declaration from pwm.h
pwm: Reorder header file to get rid of struct pwm_capture forward declaration
pwm: atmel-tcb: Fix typo in comment
...
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi updates from Mark Brown:
"The big update this time around is some excellent work from David
Jander who went through the fast path and really eliminated overheads,
meaning that we are seeing a huge reduction in the time spent between
transfers for single threaded clients.
Benchmarking has been coming out at about a halving of overhead which
is clearly visible in system level usage that stresses SPI like some
CAN and IIO applications, especially with small transfers. Thanks to
David for taking the time to drill down into this and push the work
upstream.
Otherwise there's been a bunch of new device support and the usual
updates.
- Optimisation of the fast path, particularly around the number and
types of locking operations, from David Jander.
- Support for Arbel NPCM845, HP GXP, Intel Meteor Lake and Thunder
Bay, MediaTek MT8188 and MT8365, Microchip FPGAs, nVidia Tegra 241
and Samsung Exynos Auto v9 and 4210"
* tag 'spi-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (97 commits)
MAINTAINERS: add spi support to GXP
spi: dt-bindings: add documentation for hpe,gxp-spifi
spi: spi-gxp: Add support for HPE GXP SoCs
spi: a3700: support BE for AC5 SPI driver
spi/panel: dt-bindings: drop CPHA and CPOL from common properties
spi: bcm2835: enable shared interrupt support
spi: dt-bindings: spi-controller: correct example indentation
spi: dt-bindings: qcom,spi-geni-qcom: allow three interconnects
spi: npcm-fiu: Add NPCM8XX support
dt-binding: spi: Add npcm845 compatible to npcm-fiu document
spi: npcm-fiu: Modify direct read dummy configuration
spi: atmel: remove #ifdef CONFIG_{PM, SLEEP}
spi: dt-bindings: Add compatible for MediaTek MT8188
spi: dt-bindings: mediatek,spi-mtk-nor: Update bindings for nor flash
spi: dt-bindings: atmel,at91rm9200-spi: convert to json-schema
spi: tegra20-slink: fix UAF in tegra_slink_remove()
spi: Fix simplification of devm_spi_register_controller
spi: microchip-core: switch to use dev_err_probe()
spi: microchip-core: switch to use devm_spi_alloc_master()
spi: microchip-core: fix UAF in mchp_corespi_remove()
...
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator updates from Mark Brown:
"This has been a fairly quiet release for the regulator API, a few new
drivers and a small API update:
- Support for specifying an initial load as part of requesting
regulators through the bulk API
- Support for Maxim MAX597x, Qualcomm PM8074, PM8909 and Realtek
RT5120 devices"
* tag 'regulator-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator: (35 commits)
regulator: core: Allow drivers to define their init data as const
regulator: core: Allow specifying an initial load w/ the bulk API
regulator: mt6380: Fix unused array warning
regulator: Add missing type for 'regulator-microvolt-offset'
regulator: core: Fix off-on-delay-us for always-on/boot-on regulators
regulator: of: Fix refcount leak bug in of_get_regulation_constraints()
regulator: pwm: Update Lee Jones' email address
regulator: max597x: Don't return uninitialized variable in .probe
regulator: qcom,spmi-regulator: add PMP8074 PMIC
regulator: qcom,spmi-regulator: Convert to dtschema
regulator: qcom_spmi: add support for PMP8074 regulators
regulator: qcom_spmi: add support for HT_P600
regulator: qcom_spmi: add support for HT_P150
regulator: max597x: Remove unused including <linux/version.h>
regulator: Fix MFD_MAX597X dependency
regulator: Fix parameter declaration and spelling mistake.
regulator: max597x: Add support for max597x regulator
regulator: scmi: Add missing of_node_get()
regulator: qcom_smd: Add PM8909 RPM regulators
regulator: dt-bindings: qcom,smd-rpm: Add PM8909
...
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
Pull regmap updates from Mark Brown:
"The big thing this release is a big cleanup of the interrupt code from
Aidan MacDonald, plus a few new API updates:
- Rework of the interrupt code, making it much simpler and easier to
extend
- Support for device specific update bits operations with devices
that otherwise use bitstream interfaces
- Support for bit operations on fields as well as whole registers"
* tag 'regmap-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
regmap: permit to set reg_update_bits with bulk implementation
regmap: add WARN_ONCE when invalid mask is provided to regmap_field_init()
regmap-irq: Fix bug in regmap_irq_get_irq_reg_linear()
regmap: cache: Add extra parameter check in regcache_init
regmap-irq: Deprecate the not_fixed_stride flag
regmap-irq: Add get_irq_reg() callback
regmap-irq: Fix inverted handling of unmask registers
regmap-irq: Deprecate type registers and virtual registers
regmap-irq: Introduce config registers for irq types
regmap-irq: Refactor checks for status bulk read support
regmap-irq: Remove mask_writeonly and regmap_irq_update_bits()
regmap-irq: Remove inappropriate uses of regmap_irq_update_bits()
regmap-irq: Remove an unnecessary restriction on type_in_mask
regmap-irq: Cleanup sizeof(...) use in memory allocation
regmap-irq: Remove unused type_reg_stride field
regmap-irq: Convert bool bitfields to unsigned int
regmap: Don't warn about cache only mode for devices with no cache
regmap: provide regmap_field helpers for simple bit operations
regmap: cache: Fix syntax errors in comments
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All callers are gone, so remove the now dead code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
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migrate_page_move_mapping(), migrate_page_copy() and migrate_page_states()
are all now unused after converting all the filesystems from
aops->migratepage() to aops->migrate_folio().
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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With all users converted to migrate_folio(), remove this operation.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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This involves converting migrate_huge_page_move_mapping(). We also need a
folio variant of hugetlb_set_page_subpool(), but that's for a later patch.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
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There is nothing iomap-specific about iomap_migratepage(), and it fits
a pattern used by several other filesystems, so move it to mm/migrate.c,
convert it to be filemap_migrate_folio() and convert the iomap filesystems
to use it.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
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Convert all callers to pass a folio. Most have the folio
already available. Switch all users from aops->migratepage to
aops->migrate_folio. Also turn the documentation into kerneldoc.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: David Sterba <dsterba@suse.com>
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Use a folio throughout __buffer_migrate_folio(), add kernel-doc for
buffer_migrate_folio() and buffer_migrate_folio_norefs(), move their
declarations to buffer.h and switch all filesystems that have wired
them up.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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Provide a folio-based replacement for aops->migratepage. Update the
documentation to document migrate_folio instead of migratepage.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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These drivers are rather uncomfortably hammered into the
address_space_operations hole. They aren't filesystems and don't behave
like filesystems. They just need their own movable_operations structure,
which we can point to directly from page->mapping.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC drivers from Arnd Bergmann:
"The SoC driver updates contain changes to improve support for
additional SoC variants, as well as cleanups an minor bugfixes
in a number of existing drivers.
Notable updates this time include:
- Support for Qualcomm MSM8909 (Snapdragon 210) in various drivers
- Updates for interconnect drivers on Qualcomm Snapdragon
- A new driver support for NMI interrupts on Fujitsu A64fx
- A rework of Broadcom BCMBCA Kconfig dependencies
- Improved support for BCM2711 (Raspberry Pi 4) power management to
allow the use of the V3D GPU
- Cleanups to the NXP guts driver
- Arm SCMI firmware driver updates to add tracing support, and use
the firmware interfaces for system power control and for power
capping"
* tag 'arm-drivers-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (125 commits)
soc: a64fx-diag: disable modular build
dt-bindings: soc: qcom: qcom,smd-rpm: add power-controller
dt-bindings: soc: qcom: aoss: document qcom,sm8450-aoss-qmp
dt-bindings: soc: qcom,rpmh-rsc: simplify qcom,tcs-config
ARM: mach-qcom: Add support for MSM8909
dt-bindings: arm: cpus: Document "qcom,msm8909-smp" enable-method
soc: qcom: spm: Add CPU data for MSM8909
dt-bindings: soc: qcom: spm: Add MSM8909 CPU compatible
soc: qcom: rpmpd: Add compatible for MSM8909
dt-bindings: power: qcom-rpmpd: Add MSM8909 power domains
soc: qcom: smd-rpm: Add compatible for MSM8909
dt-bindings: soc: qcom: smd-rpm: Add MSM8909
soc: qcom: icc-bwmon: Remove unnecessary print function dev_err()
soc: fujitsu: Add A64FX diagnostic interrupt driver
soc: qcom: socinfo: Fix the id of SA8540P SoC
soc: qcom: Make QCOM_RPMPD depend on PM
tty: serial: bcm63xx: bcmbca: Replace ARCH_BCM_63XX with ARCH_BCMBCA
spi: bcm63xx-hsspi: bcmbca: Replace ARCH_BCM_63XX with ARCH_BCMBCA
clk: bcm: bcmbca: Replace ARCH_BCM_63XX with ARCH_BCMBCA
hwrng: bcm2835: bcmbca: Replace ARCH_BCM_63XX with ARCH_BCMBCA
...
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Pull ARM SoC updates from Arnd Bergmann:
"The updates for arch/arm/mach-* platform code this time are mainly
minor cleanups.
Most notably, the DaVinci DM644x/DM646x SoC support gets removed. This
was also scheduled for later removal early next year, but Linus
Walleij asked for having them removed earlier to avoid problems for
the GPIO subsystem"
* tag 'arm-soc-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (38 commits)
ARM: at91: setup outer cache .write_sec() callback if needed
ARM: at91: add sam_linux_is_optee_available() function
ARM: Marvell: Update PCIe fixup
ARM: bcmbca: Include full family name in Kconfig
ARM: bcm: NSP: Removed forced thermal selection
ARM: debug: bcmbca: Replace ARCH_BCM_63XX with ARCH_BCMBCA
arm: bcmbca: Add BCMBCA sub platforms
arm: bcmbca: Move BCM63138 ARCH_BCM_63XX to ARCH_BCMBCA
MAINTAINERS: Move BCM63138 to bcmbca arch entry
ARM: shmobile: rcar-gen2: Increase refcount for new reference
ARM: davinci: Delete DM646x board files
ARM: davinci: Delete DM644x board files
firmware: xilinx: Add TF_A_PM_REGISTER_SGI SMC call
cpufreq: zynq: Fix refcount leak in zynq_get_revision
ARM: OMAP2+: Kconfig: Fix indentation
ARM: OMAP2+: Fix refcount leak in omap3xxx_prm_late_init
ARM: OMAP2+: pdata-quirks: Fix refcount leak bug
ARM: OMAP2+: display: Fix refcount leak bug
ARM: OMAP2+: Fix refcount leak in omapdss_init_of
ARM: imx25: support silicon revision 1.2
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq updates from Thomas Gleixner:
"Updates for interrupt core and drivers:
Core:
- Fix a few inconsistencies between UP and SMP vs interrupt
affinities
- Small updates and cleanups all over the place
New drivers:
- LoongArch interrupt controller
- Renesas RZ/G2L interrupt controller
Updates:
- Hotpath optimization for SiFive PLIC
- Workaround for broken PLIC edge triggered interrupts
- Simall cleanups and improvements as usual"
* tag 'irq-core-2022-08-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
irqchip/mmp: Declare init functions in common header file
irqchip/mips-gic: Check the return value of ioremap() in gic_of_init()
genirq: Use for_each_action_of_desc in actions_show()
irqchip / ACPI: Introduce ACPI_IRQ_MODEL_LPIC for LoongArch
irqchip: Add LoongArch CPU interrupt controller support
irqchip: Add Loongson Extended I/O interrupt controller support
irqchip/loongson-liointc: Add ACPI init support
irqchip/loongson-pch-msi: Add ACPI init support
irqchip/loongson-pch-pic: Add ACPI init support
irqchip: Add Loongson PCH LPC controller support
LoongArch: Prepare to support multiple pch-pic and pch-msi irqdomain
LoongArch: Use ACPI_GENERIC_GSI for gsi handling
genirq/generic_chip: Export irq_unmap_generic_chip
ACPI: irq: Allow acpi_gsi_to_irq() to have an arch-specific fallback
APCI: irq: Add support for multiple GSI domains
LoongArch: Provisionally add ACPICA data structures
irqdomain: Use hwirq_max instead of revmap_size for NOMAP domains
irqdomain: Report irq number for NOMAP domains
irqchip/gic-v3: Fix comment typo
dt-bindings: interrupt-controller: renesas,rzg2l-irqc: Document RZ/V2L SoC
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer updates from Thomas Gleixner:
"Timers, timekeeping and related drivers update:
Core:
- Make wait_event_hrtimeout() aware of RT/DL tasks
New drivers:
- R-Car Gen4 timer
- Tegra186 timer
- Mediatek MT6795 CPUXGPT timer
Updates:
- Rework suspend/resume handling in timer drivers so it
takes inactive clocks into account.
- The usual device tree compatible add ons
- Small fixed and cleanups all over the place"
* tag 'timers-core-2022-08-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
wait: Fix __wait_event_hrtimeout for RT/DL tasks
clocksource/drivers/sun5i: Remove unnecessary (void*) conversions
dt-bindings: timer: allwinner,sun4i-a10-timer: Add D1 compatible
dt-bindings: timer: ingenic,tcu: use absolute path to other schema
clocksource/drivers/sun4i: Remove unnecessary (void*) conversions
dt-bindings: timer: renesas,cmt: Fix R-Car Gen4 fall-out
clocksource/drivers/tegra186: Put Kconfig option 'tristate' to 'bool'
clocksource/drivers/timer-ti-dm: Make driver selection bool for TI K3
clocksource/drivers/timer-ti-dm: Add compatible for am6 SoCs
clocksource/drivers/timer-ti-dm: Make timer selectable for ARCH_K3
clocksource/drivers/timer-ti-dm: Move inline functions to driver for am6
clocksource/drivers/sh_cmt: Add R-Car Gen4 support
dt-bindings: timer: renesas,cmt: R-Car V3U is R-Car Gen4
dt-bindings: timer: renesas,cmt: Add r8a779f0 and generic Gen4 CMT support
clocksource/drivers/timer-microchip-pit64b: Fix compilation warnings
clocksource/drivers/timer-microchip-pit64b: Use mchp_pit64b_{suspend, resume}
clocksource/drivers/timer-microchip-pit64b: Remove suspend/resume ops for ce
thermal/drivers/rcar_gen3_thermal: Add r8a779f0 support
clocksource/drivers/timer-mediatek: Implement CPUXGPT timers
dt-bindings: timer: mediatek: Add CPUX System Timer and MT6795 compatible
...
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SPI NOR core changes:
- move SECT_4K_PMC flag out of the core as it's a vendor specific flag
- s/addr_width/addr_nbytes: address width means the number of IO lines
used for the address, whereas in the code it is used as the number of
address bytes.
- do not change nor->addr_nbytes at SFDP parsing time. At the SFDP parsing
time we should not change members of struct spi_nor, but instead fill
members of struct spi_nor_flash_parameters which could later on be used
by the callers.
- track flash's internal address mode so that we can use 4B opcodes
together with opcodes that don't have a 4B opcode correspondent.
SPI NOR manufacturer drivers changes:
- esmt: Rename "f25l32qa" flash name to "f25l32qa-2s".
- micron-st: Skip FSR reading if SPI controller does not support it to
allow flashes that support FSR to work even when attached to such SPI
controllers.
- spansion: Add s25hl-t/s25hs-t IDs and fixups.
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf events updates from Ingo Molnar:
- Fix Intel Alder Lake PEBS memory access latency & data source
profiling info bugs.
- Use Intel large-PEBS hardware feature in more circumstances, to
reduce PMI overhead & reduce sampling data.
- Extend the lost-sample profiling output with the PERF_FORMAT_LOST ABI
variant, which tells tooling the exact number of samples lost.
- Add new IBS register bits definitions.
- AMD uncore events: Add PerfMonV2 DF (Data Fabric) enhancements.
* tag 'perf-core-2022-08-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/ibs: Add new IBS register bits into header
perf/x86/intel: Fix PEBS data source encoding for ADL
perf/x86/intel: Fix PEBS memory access info encoding for ADL
perf/core: Add a new read format to get a number of lost samples
perf/x86/amd/uncore: Add PerfMonV2 RDPMC assignments
perf/x86/amd/uncore: Add PerfMonV2 DF event format
perf/x86/amd/uncore: Detect available DF counters
perf/x86/amd/uncore: Use attr_update for format attributes
perf/x86/amd/uncore: Use dynamic events array
x86/events/intel/ds: Enable large PEBS for PERF_SAMPLE_WEIGHT_TYPE
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
"This was a fairly quiet cycle for the locking subsystem:
- lockdep: Fix a handful of the more complex lockdep_init_map_*()
primitives that can lose the lock_type & cause false reports. No
such mishap was observed in the wild.
- jump_label improvements: simplify the cross-arch support of initial
NOP patching by making it arch-specific code (used on MIPS only),
and remove the s390 initial NOP patching that was superfluous"
* tag 'locking-core-2022-08-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/lockdep: Fix lockdep_init_map_*() confusion
jump_label: make initial NOP patching the special case
jump_label: mips: move module NOP patching into arch code
jump_label: s390: avoid pointless initial NOP patching
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler updates from Ingo Molnar:
"Load-balancing improvements:
- Improve NUMA balancing on AMD Zen systems for affine workloads.
- Improve the handling of reduced-capacity CPUs in load-balancing.
- Energy Model improvements: fix & refine all the energy fairness
metrics (PELT), and remove the conservative threshold requiring 6%
energy savings to migrate a task. Doing this improves power
efficiency for most workloads, and also increases the reliability
of energy-efficiency scheduling.
- Optimize/tweak select_idle_cpu() to spend (much) less time
searching for an idle CPU on overloaded systems. There's reports of
several milliseconds spent there on large systems with large
workloads ...
[ Since the search logic changed, there might be behavioral side
effects. ]
- Improve NUMA imbalance behavior. On certain systems with spare
capacity, initial placement of tasks is non-deterministic, and such
an artificial placement imbalance can persist for a long time,
hurting (and sometimes helping) performance.
The fix is to make fork-time task placement consistent with runtime
NUMA balancing placement.
Note that some performance regressions were reported against this,
caused by workloads that are not memory bandwith limited, which
benefit from the artificial locality of the placement bug(s). Mel
Gorman's conclusion, with which we concur, was that consistency is
better than random workload benefits from non-deterministic bugs:
"Given there is no crystal ball and it's a tradeoff, I think
it's better to be consistent and use similar logic at both fork
time and runtime even if it doesn't have universal benefit."
- Improve core scheduling by fixing a bug in
sched_core_update_cookie() that caused unnecessary forced idling.
- Improve wakeup-balancing by allowing same-LLC wakeup of idle CPUs
for newly woken tasks.
- Fix a newidle balancing bug that introduced unnecessary wakeup
latencies.
ABI improvements/fixes:
- Do not check capabilities and do not issue capability check denial
messages when a scheduler syscall doesn't require privileges. (Such
as increasing niceness.)
- Add forced-idle accounting to cgroups too.
- Fix/improve the RSEQ ABI to not just silently accept unknown flags.
(No existing tooling is known to have learned to rely on the
previous behavior.)
- Depreciate the (unused) RSEQ_CS_FLAG_NO_RESTART_ON_* flags.
Optimizations:
- Optimize & simplify leaf_cfs_rq_list()
- Micro-optimize set_nr_{and_not,if}_polling() via try_cmpxchg().
Misc fixes & cleanups:
- Fix the RSEQ self-tests on RISC-V and Glibc 2.35 systems.
- Fix a full-NOHZ bug that can in some cases result in the tick not
being re-enabled when the last SCHED_RT task is gone from a
runqueue but there's still SCHED_OTHER tasks around.
- Various PREEMPT_RT related fixes.
- Misc cleanups & smaller fixes"
* tag 'sched-core-2022-08-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (32 commits)
rseq: Kill process when unknown flags are encountered in ABI structures
rseq: Deprecate RSEQ_CS_FLAG_NO_RESTART_ON_* flags
sched/core: Fix the bug that task won't enqueue into core tree when update cookie
nohz/full, sched/rt: Fix missed tick-reenabling bug in dequeue_task_rt()
sched/core: Always flush pending blk_plug
sched/fair: fix case with reduced capacity CPU
sched/core: Use try_cmpxchg in set_nr_{and_not,if}_polling
sched/core: add forced idle accounting for cgroups
sched/fair: Remove the energy margin in feec()
sched/fair: Remove task_util from effective utilization in feec()
sched/fair: Use the same cpumask per-PD throughout find_energy_efficient_cpu()
sched/fair: Rename select_idle_mask to select_rq_mask
sched, drivers: Remove max param from effective_cpu_util()/sched_cpu_util()
sched/fair: Decay task PELT values during wakeup migration
sched/fair: Provide u64 read for 32-bits arch helper
sched/fair: Introduce SIS_UTIL to search idle CPU based on sum of util_avg
sched: only perform capability check on privileged operation
sched: Remove unused function group_first_cpu()
sched/fair: Remove redundant word " *"
selftests/rseq: check if libc rseq support is registered
...
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 updates from Will Deacon:
"Highlights include a major rework of our kPTI page-table rewriting
code (which makes it both more maintainable and considerably faster in
the cases where it is required) as well as significant changes to our
early boot code to reduce the need for data cache maintenance and
greatly simplify the KASLR relocation dance.
Summary:
- Remove unused generic cpuidle support (replaced by PSCI version)
- Fix documentation describing the kernel virtual address space
- Handling of some new CPU errata in Arm implementations
- Rework of our exception table code in preparation for handling
machine checks (i.e. RAS errors) more gracefully
- Switch over to the generic implementation of ioremap()
- Fix lockdep tracking in NMI context
- Instrument our memory barrier macros for KCSAN
- Rework of the kPTI G->nG page-table repainting so that the MMU
remains enabled and the boot time is no longer slowed to a crawl
for systems which require the late remapping
- Enable support for direct swapping of 2MiB transparent huge-pages
on systems without MTE
- Fix handling of MTE tags with allocating new pages with HW KASAN
- Expose the SMIDR register to userspace via sysfs
- Continued rework of the stack unwinder, particularly improving the
behaviour under KASAN
- More repainting of our system register definitions to match the
architectural terminology
- Improvements to the layout of the vDSO objects
- Support for allocating additional bits of HWCAP2 and exposing
FEAT_EBF16 to userspace on CPUs that support it
- Considerable rework and optimisation of our early boot code to
reduce the need for cache maintenance and avoid jumping in and out
of the kernel when handling relocation under KASLR
- Support for disabling SVE and SME support on the kernel
command-line
- Support for the Hisilicon HNS3 PMU
- Miscellanous cleanups, trivial updates and minor fixes"
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (136 commits)
arm64: Delay initialisation of cpuinfo_arm64::reg_{zcr,smcr}
arm64: fix KASAN_INLINE
arm64/hwcap: Support FEAT_EBF16
arm64/cpufeature: Store elf_hwcaps as a bitmap rather than unsigned long
arm64/hwcap: Document allocation of upper bits of AT_HWCAP
arm64: enable THP_SWAP for arm64
arm64/mm: use GENMASK_ULL for TTBR_BADDR_MASK_52
arm64: errata: Remove AES hwcap for COMPAT tasks
arm64: numa: Don't check node against MAX_NUMNODES
drivers/perf: arm_spe: Fix consistency of SYS_PMSCR_EL1.CX
perf: RISC-V: Add of_node_put() when breaking out of for_each_of_cpu_node()
docs: perf: Include hns3-pmu.rst in toctree to fix 'htmldocs' WARNING
arm64: kasan: Revert "arm64: mte: reset the page tag in page->flags"
mm: kasan: Skip page unpoisoning only if __GFP_SKIP_KASAN_UNPOISON
mm: kasan: Skip unpoisoning of user pages
mm: kasan: Ensure the tags are visible before the tag in page->flags
drivers/perf: hisi: add driver for HNS3 PMU
drivers/perf: hisi: Add description for HNS3 PMU driver
drivers/perf: riscv_pmu_sbi: perf format
perf/arm-cci: Use the bitmap API to allocate bitmaps
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 kdump updates from Borislav Petkov:
- Add the ability to pass early an RNG seed to the kernel from the boot
loader
- Add the ability to pass the IMA measurement of kernel and bootloader
to the kexec-ed kernel
* tag 'x86_kdump_for_v6.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/setup: Use rng seeds from setup_data
x86/kexec: Carry forward IMA measurement log on kexec
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 core updates from Borislav Petkov:
- Have invalid MSR accesses warnings appear only once after a
pr_warn_once() change broke that
- Simplify {JMP,CALL}_NOSPEC and let the objtool retpoline patching
infra take care of them instead of having unreadable alternative
macros there
* tag 'x86_core_for_v6.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/extable: Fix ex_handler_msr() print condition
x86,nospec: Simplify {JMP,CALL}_NOSPEC
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull misc x86 updates from Borislav Petkov:
- Add a bunch of PCI IDs for new AMD CPUs and use them in k10temp
- Free the pmem platform device on the registration error path
* tag 'x86_misc_for_v6.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
hwmon: (k10temp): Add support for new family 17h and 19h models
x86/amd_nb: Add AMD PCI IDs for SMN communication
x86/pmem: Fix platform-device leak in error path
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git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
Pull acl updates from Christian Brauner:
"Last cycle we introduced support for mounting overlayfs on top of
idmapped mounts. While looking into additional testing we realized
that posix acls don't really work correctly with stacking filesystems
on top of idmapped layers.
We already knew what the fix were but it would require work that is
more suitable for the merge window so we turned off posix acls for
v5.19 for overlayfs on top of idmapped layers with Miklos routing my
patch upstream in 72a8e05d4f66 ("Merge tag 'ovl-fixes-5.19-rc7' [..]").
This contains the work to support posix acls for overlayfs on top of
idmapped layers. Since the posix acl fixes should use the new
vfs{g,u}id_t work the associated branch has been merged in. (We sent a
pull request for this earlier.)
We've also pulled in Miklos pull request containing my patch to turn
of posix acls on top of idmapped layers. This allowed us to avoid
rebasing the branch which we didn't like because we were already at
rc7 by then. Merging it in allows this branch to first fix posix acls
and then to cleanly revert the temporary fix it brought in by commit
4a47c6385bb4 ("ovl: turn of SB_POSIXACL with idmapped layers
temporarily").
The last patch in this series adds Seth Forshee as a co-maintainer for
idmapped mounts. Seth has been integral to all of this work and is
also the main architect behind the filesystem idmapping work which
ultimately made filesystems such as FUSE and overlayfs available in
containers. He continues to be active in both development and review.
I'm very happy he decided to help and he has my full trust. This
increases the bus factor which is always great for work like this. I'm
honestly very excited about this because I think in general we don't
do great in the bringing on new maintainers department"
For more explanations of the ACL issues, see
https://lore.kernel.org/all/20220801145520.1532837-1-brauner@kernel.org/
* tag 'fs.idmapped.overlay.acl.v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
Add Seth Forshee as co-maintainer for idmapped mounts
Revert "ovl: turn of SB_POSIXACL with idmapped layers temporarily"
ovl: handle idmappings in ovl_get_acl()
acl: make posix_acl_clone() available to overlayfs
acl: port to vfs{g,u}id_t
acl: move idmapped mount fixup into vfs_{g,s}etxattr()
mnt_idmapping: add vfs[g,u]id_into_k[g,u]id()
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git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
Pull fs idmapping updates from Christian Brauner:
"This introduces the new vfs{g,u}id_t types we agreed on. Similar to
k{g,u}id_t the new types are just simple wrapper structs around
regular {g,u}id_t types.
They allow to establish a type safety boundary in the VFS for idmapped
mounts preventing confusion betwen {g,u}ids mapped into an idmapped
mount and {g,u}ids mapped into the caller's or the filesystem's
idmapping.
An initial set of helpers is introduced that allows to operate on
vfs{g,u}id_t types. We will remove all references to non-type safe
idmapped mounts helpers in the very near future. The patches do
already exist.
This converts the core attribute changing codepaths which become
significantly easier to reason about because of this change.
Just a few highlights here as the patches give detailed overviews of
what is happening in the commit messages:
- The kernel internal struct iattr contains type safe vfs{g,u}id_t
values clearly communicating that these values have to take a given
mount's idmapping into account.
- The ownership values placed in struct iattr to change ownership are
identical for idmapped and non-idmapped mounts going forward. This
also allows to simplify stacking filesystems such as overlayfs that
change attributes In other words, they always represent the values.
- Instead of open coding checks for whether ownership changes have
been requested and an actual update of the inode is required we now
have small static inline wrappers that abstract this logic away
removing a lot of code duplication from individual filesystems that
all open-coded the same checks"
* tag 'fs.idmapped.vfsuid.v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
mnt_idmapping: align kernel doc and parameter order
mnt_idmapping: use new helpers in mapped_fs{g,u}id()
fs: port HAS_UNMAPPED_ID() to vfs{g,u}id_t
mnt_idmapping: return false when comparing two invalid ids
attr: fix kernel doc
attr: port attribute changes to new types
security: pass down mount idmapping to setattr hook
quota: port quota helpers mount ids
fs: port to iattr ownership update helpers
fs: introduce tiny iattr ownership update helpers
fs: use mount types in iattr
fs: add two type safe mapping helpers
mnt_idmapping: add vfs{g,u}id_t
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git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull fsnotify updates from Jan Kara:
- support for FAN_MARK_IGNORE which untangles some of the not well
defined corner cases with fanotify ignore masks
- small cleanups
* tag 'fsnotify_for_v5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
fsnotify: Fix comment typo
fanotify: introduce FAN_MARK_IGNORE
fanotify: cleanups for fanotify_mark() input validations
fanotify: prepare for setting event flags in ignore mask
fs: inotify: Fix typo in inotify comment
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The functions are pretty thin wrappers around find_bit engine, and
keeping them in c-file prevents compiler from small_const_nbits()
optimization, which must take place for all systems with MAX_NUMNODES
less than BITS_PER_LONG (default is 16 for me).
Moving them to header file doesn't blow up the kernel size:
add/remove: 1/2 grow/shrink: 9/5 up/down: 968/-88 (880)
CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Michael Ellerman <mpe@ellerman.id.au>
CC: Paul Mackerras <paulus@samba.org>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
CC: Stephen Rothwell <sfr@canb.auug.org.au>
CC: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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review-hans
Immutable branch between MFD, EDAC, I2C, LEDs, PinCtrl, Platform and Watchdog due for the v5.20 merge window
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https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
ASoC: More updates for v5.20
More updates that came in since the last pull request I sent, a series
of driver specific changes:
- Support for AMD RPL, some Intel platforms and Mediatek MT8186.
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git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next
Marc Kleine-Budde says:
====================
pull-request: can-next 2022-07-31
this is a pull request of 36 patches for net-next/master.
The 1st patch is by me and fixes a typo in the mcp251xfd driver.
Vincent Mailhol contributes a series of 9 patches, which clean up the
drivers to make use of KBUILD_MODNAME instead of hard coded names and
remove DRV_VERSION.
Followed by 3 patches by Vincent Mailhol that directly set the
ethtool_ops in instead of calling a function in the slcan, c_can and
flexcan driver.
Vincent Mailhol contributes a KBUILD_MODNAME and pr_fmt cleanup patch
for the slcan driver. Dario Binacchi contributes 6 patches to clean up
the driver and remove the legacy driver infrastructure.
The next 14 patches are by Vincent Mailhol and target the various
drivers, they add ethtool support and reporting of timestamping
capabilities.
Another patch by Vincent Mailhol for the etas_es58x driver to remove
useless calls to usb_fill_bulk_urb().
The last patch is by Christophe JAILLET and fixes a broken link to
Documentation in the can327 driver.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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KVM/s390, KVM/x86 and common infrastructure changes for 5.20
x86:
* Permit guests to ignore single-bit ECC errors
* Fix races in gfn->pfn cache refresh; do not pin pages tracked by the cache
* Intel IPI virtualization
* Allow getting/setting pending triple fault with KVM_GET/SET_VCPU_EVENTS
* PEBS virtualization
* Simplify PMU emulation by just using PERF_TYPE_RAW events
* More accurate event reinjection on SVM (avoid retrying instructions)
* Allow getting/setting the state of the speaker port data bit
* Refuse starting the kvm-intel module if VM-Entry/VM-Exit controls are inconsistent
* "Notify" VM exit (detect microarchitectural hangs) for Intel
* Cleanups for MCE MSR emulation
s390:
* add an interface to provide a hypervisor dump for secure guests
* improve selftests to use TAP interface
* enable interpretive execution of zPCI instructions (for PCI passthrough)
* First part of deferred teardown
* CPU Topology
* PV attestation
* Minor fixes
Generic:
* new selftests API using struct kvm_vcpu instead of a (vm, id) tuple
x86:
* Use try_cmpxchg64 instead of cmpxchg64
* Bugfixes
* Ignore benign host accesses to PMU MSRs when PMU is disabled
* Allow disabling KVM's "MONITOR/MWAIT are NOPs!" behavior
* x86/MMU: Allow NX huge pages to be disabled on a per-vm basis
* Port eager page splitting to shadow MMU as well
* Enable CMCI capability by default and handle injected UCNA errors
* Expose pid of vcpu threads in debugfs
* x2AVIC support for AMD
* cleanup PIO emulation
* Fixes for LLDT/LTR emulation
* Don't require refcounted "struct page" to create huge SPTEs
x86 cleanups:
* Use separate namespaces for guest PTEs and shadow PTEs bitmasks
* PIO emulation
* Reorganize rmap API, mostly around rmap destruction
* Do not workaround very old KVM bugs for L0 that runs with nesting enabled
* new selftests API for CPUID
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The only use case of the platform_has() infrastructure has been
removed again, so remove the whole feature.
Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 guest using Xen
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/20220622063838.8854-3-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
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Instead of having a global flag to require restricted memory access
for all virtio devices, introduce a callback which can select that
requirement on a per-device basis.
For convenience add a common function returning always true, which can
be used for use cases like SEV.
Per default use a callback always returning false.
As the callback needs to be set in early init code already, add a
virtio anchor which is builtin in case virtio is enabled.
Signed-off-by: Juergen Gross <jgross@suse.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 guest using Xen
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/20220622063838.8854-2-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
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In Linux terms, the runtime verification monitors are encapsulated
inside the "RV monitor" abstraction. The "RV monitor" includes a set
of instances of the monitor (per-cpu monitor, per-task monitor, and
so on), the helper functions that glue the monitor to the system
reference model, and the trace output as a reaction for event parsing
and exceptions, as depicted below:
Linux +----- RV Monitor ----------------------------------+ Formal
Realm | | Realm
+-------------------+ +----------------+ +-----------------+
| Linux kernel | | Monitor | | Reference |
| Tracing | -> | Instance(s) | <- | Model |
| (instrumentation) | | (verification) | | (specification) |
+-------------------+ +----------------+ +-----------------+
| | |
| V |
| +----------+ |
| | Reaction | |
| +--+--+--+-+ |
| | | | |
| | | +-> trace output ? |
+------------------------|--|----------------------+
| +----> panic ?
+-------> <user-specified>
Add the rv/da_monitor.h, enabling automatic code generation for the
*Monitor Instance(s)* using C macros, and code to support it.
The benefits of the usage of macro for monitor synthesis are 3-fold as it:
- Reduces the code duplication;
- Facilitates the bug fix/improvement;
- Avoids the case of developers changing the core of the monitor code
to manipulate the model in a (let's say) non-standard way.
This initial implementation presents three different types of monitor
instances:
- DECLARE_DA_MON_GLOBAL(name, type)
- DECLARE_DA_MON_PER_CPU(name, type)
- DECLARE_DA_MON_PER_TASK(name, type)
The first declares the functions for a global deterministic automata monitor,
the second for monitors with per-cpu instances, and the third with per-task
instances.
Link: https://lkml.kernel.org/r/51b0bf425a281e226dfeba7401d2115d6091f84e.1659052063.git.bristot@kernel.org
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Gabriele Paoloni <gpaoloni@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Tao Zhou <tao.zhou@linux.dev>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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A runtime monitor can cause a reaction to the detection of an
exception on the model's execution. By default, the monitors have
tracing reactions, printing the monitor output via tracepoints.
But other reactions can be added (on-demand) via this interface.
The user interface resembles the kernel tracing interface and
presents these files:
"available_reactors"
- Reading shows the available reactors, one per line.
For example:
# cat available_reactors
nop
panic
printk
"reacting_on"
- It is an on/off general switch for reactors, disabling
all reactions.
"monitors/MONITOR/reactors"
- List available reactors, with the select reaction for the given
MONITOR inside []. The default one is the nop (no operation)
reactor.
- Writing the name of a reactor enables it to the given
MONITOR.
For example:
# cat monitors/wip/reactors
[nop]
panic
printk
# echo panic > monitors/wip/reactors
# cat monitors/wip/reactors
nop
[panic]
printk
Link: https://lkml.kernel.org/r/1794eb994637457bdeaa6bad0b8263d2f7eece0c.1659052063.git.bristot@kernel.org
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Gabriele Paoloni <gpaoloni@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Tao Zhou <tao.zhou@linux.dev>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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RV is a lightweight (yet rigorous) method that complements classical
exhaustive verification techniques (such as model checking and
theorem proving) with a more practical approach to complex systems.
RV works by analyzing the trace of the system's actual execution,
comparing it against a formal specification of the system behavior.
RV can give precise information on the runtime behavior of the
monitored system while enabling the reaction for unexpected
events, avoiding, for example, the propagation of a failure on
safety-critical systems.
The development of this interface roots in the development of the
paper:
De Oliveira, Daniel Bristot; Cucinotta, Tommaso; De Oliveira, Romulo
Silva. Efficient formal verification for the Linux kernel. In:
International Conference on Software Engineering and Formal Methods.
Springer, Cham, 2019. p. 315-332.
And:
De Oliveira, Daniel Bristot. Automata-based formal analysis
and verification of the real-time Linux kernel. PhD Thesis, 2020.
The RV interface resembles the tracing/ interface on purpose. The current
path for the RV interface is /sys/kernel/tracing/rv/.
It presents these files:
"available_monitors"
- List the available monitors, one per line.
For example:
# cat available_monitors
wip
wwnr
"enabled_monitors"
- Lists the enabled monitors, one per line;
- Writing to it enables a given monitor;
- Writing a monitor name with a '!' prefix disables it;
- Truncating the file disables all enabled monitors.
For example:
# cat enabled_monitors
# echo wip > enabled_monitors
# echo wwnr >> enabled_monitors
# cat enabled_monitors
wip
wwnr
# echo '!wip' >> enabled_monitors
# cat enabled_monitors
wwnr
# echo > enabled_monitors
# cat enabled_monitors
#
Note that more than one monitor can be enabled concurrently.
"monitoring_on"
- It is an on/off general switcher for monitoring. Note
that it does not disable enabled monitors or detach events,
but stop the per-entity monitors of monitoring the events
received from the system. It resembles the "tracing_on" switcher.
"monitors/"
Each monitor will have its one directory inside "monitors/". There
the monitor specific files will be presented.
The "monitors/" directory resembles the "events" directory on
tracefs.
For example:
# cd monitors/wip/
# ls
desc enable
# cat desc
wakeup in preemptive per-cpu testing monitor.
# cat enable
0
For further information, see the comments in the header of
kernel/trace/rv/rv.c from this patch.
Link: https://lkml.kernel.org/r/a4bfe038f50cb047bfb343ad0e12b0e646ab308b.1659052063.git.bristot@kernel.org
Cc: Wim Van Sebroeck <wim@linux-watchdog.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Gabriele Paoloni <gpaoloni@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Tao Zhou <tao.zhou@linux.dev>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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__d_lookup_done() wakes waiters on dentry->d_wait. On PREEMPT_RT we are
not allowed to do that with preemption disabled, since the wakeup
acquired wait_queue_head::lock, which is a "sleeping" spinlock on RT.
Calling it under dentry->d_lock is not a problem, since that is also a
"sleeping" spinlock on the same configs. Unfortunately, two of its
callers (__d_add() and __d_move()) are holding more than just ->d_lock
and that needs to be dealt with.
The key observation is that wakeup can be moved to any point before
dropping ->d_lock.
As a first step to solve this, move the wake up outside of the
hlist_bl_lock() held section.
This is safe because:
Waiters get inserted into ->d_wait only after they'd taken ->d_lock
and observed DCACHE_PAR_LOOKUP in flags. As long as they are
woken up (and evicted from the queue) between the moment __d_lookup_done()
has removed DCACHE_PAR_LOOKUP and dropping ->d_lock, we are safe,
since the waitqueue ->d_wait points to won't get destroyed without
having __d_lookup_done(dentry) called (under ->d_lock).
->d_wait is set only by d_alloc_parallel() and only in case when
it returns a freshly allocated in-lookup dentry. Whenever that happens,
we are guaranteed that __d_lookup_done() will be called for resulting
dentry (under ->d_lock) before the wq in question gets destroyed.
With two exceptions wq lives in call frame of the caller of
d_alloc_parallel() and we have an explicit d_lookup_done() on the
resulting in-lookup dentry before we leave that frame.
One of those exceptions is nfs_call_unlink(), where wq is embedded into
(dynamically allocated) struct nfs_unlinkdata. It is destroyed in
nfs_async_unlink_release() after an explicit d_lookup_done() on the
dentry wq went into.
Remaining exception is d_add_ci(). There wq is what we'd found in
->d_wait of d_add_ci() argument. Callers of d_add_ci() are two
instances of ->d_lookup() and they must have been given an in-lookup
dentry. Which means that they'd been called by __lookup_slow() or
lookup_open(), with wq in the call frame of one of those.
Result of d_alloc_parallel() in d_add_ci() is fed to
d_splice_alias(), which either returns non-NULL (and d_add_ci() does
d_lookup_done()) or feeds dentry to __d_add() that will do
__d_lookup_done() under ->d_lock. That concludes the analysis.
Let __d_lookup_unhash():
1) Lock the lookup hash and clear DCACHE_PAR_LOOKUP
2) Unhash the dentry
3) Retrieve and clear dentry::d_wait
4) Unlock the hash and return the retrieved waitqueue head pointer
5) Let the caller handle the wake up.
6) Rename __d_lookup_done() to __d_lookup_unhash_wake() to enforce
build failures for OOT code that used __d_lookup_done() and is not
aware of the new return value.
This does not yet solve the PREEMPT_RT problem completely because
preemption is still disabled due to i_dir_seq being held for write. This
will be addressed in subsequent steps.
An alternative solution would be to switch the waitqueue to a simple
waitqueue, but aside of Linus not being a fan of them, moving the wake up
closer to the place where dentry::lock is unlocked reduces lock contention
time for the woken up waiter.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lkml.kernel.org/r/20220613140712.77932-3-bigeasy@linutronix.de
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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