Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. Quick Start ----------- * Report a bug: See Documentation/admin-guide/reporting-issues.rst * Get the latest kernel: https://kernel.org * Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst * Join the community: https://lore.kernel.org/ Essential Documentation ----------------------- All users should be familiar with: * Building requirements: Documentation/process/changes.rst * Code of Conduct: Documentation/process/code-of-conduct.rst * License: See COPYING Documentation can be built with make htmldocs or viewed online at: https://www.kernel.org/doc/html/latest/ Who Are You? ============ Find your role below: * New Kernel Developer - Getting started with kernel development * Academic Researcher - Studying kernel internals and architecture * Security Expert - Hardening and vulnerability analysis * Backport/Maintenance Engineer - Maintaining stable kernels * System Administrator - Configuring and troubleshooting * Maintainer - Leading subsystems and reviewing patches * Hardware Vendor - Writing drivers for new hardware * Distribution Maintainer - Packaging kernels for distros * AI Coding Assistant - LLMs and AI-powered development tools For Specific Users ================== New Kernel Developer -------------------- Welcome! Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst AI Coding Assistant ------------------- CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and follow the AI coding assistants documentation before contributing to the Linux kernel: * Documentation/process/coding-assistants.rst This documentation contains essential requirements about licensing, attribution, and the Developer Certificate of Origin that all AI tools must comply with. Communication and Support ========================= * Mailing Lists: https://lore.kernel.org/ * IRC: #kernelnewbies on irc.oftc.net * Bugzilla: https://bugzilla.kernel.org/ * MAINTAINERS file: Lists subsystem maintainers and mailing lists * Email Clients: Documentation/process/email-clients.rst
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Pull sched_ext updates from Tejun Heo:
- Move C example schedulers back from the external scx repo to
tools/sched_ext as the authoritative source. scx_userland and
scx_pair are returning while scx_sdt (BPF arena-based task data
management) is new. These schedulers will be dropped from the
external repo.
- Improve error reporting by adding scx_bpf_error() calls when DSQ
creation fails across all in-tree schedulers
- Avoid redundant irq_work_queue() calls in destroy_dsq() by only
queueing when llist_add() indicates an empty list
- Fix flaky init_enable_count selftest by properly synchronizing
pre-forked children using a pipe instead of sleep()
* tag 'sched_ext-for-6.20' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext:
selftests/sched_ext: Fix init_enable_count flakiness
tools/sched_ext: Fix data header access during free in scx_sdt
tools/sched_ext: Add error logging for dsq creation failures in remaining schedulers
tools/sched_ext: add arena based scheduler
tools/sched_ext: add scx_pair scheduler
tools/sched_ext: add scx_userland scheduler
sched_ext: Add error logging for dsq creation failures
sched_ext: Avoid multiple irq_work_queue() calls in destroy_dsq()
Pull cgroup updates from Tejun Heo:
- cpuset changes:
- Continue separating v1 and v2 implementations by moving more
v1-specific logic into cpuset-v1.c
- Improve partition handling. Sibling partitions are no longer
invalidated on cpuset.cpus conflict, cpuset.cpus changes no longer
fail in v2, and effective_xcpus computation is made consistent
- Fix partition effective CPUs overlap that caused a warning on
cpuset removal when sibling partitions shared CPUs
- Increase the maximum cgroup subsystem count from 16 to 32 to
accommodate future subsystem additions
- Misc cleanups and selftest improvements including switching to
css_is_online() helper, removing dead code and stale documentation
references, using lockdep_assert_cpuset_lock_held() consistently, and
adding polling helpers for asynchronously updated cgroup statistics
* tag 'cgroup-for-6.20' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (21 commits)
cpuset: fix overlap of partition effective CPUs
cgroup: increase maximum subsystem count from 16 to 32
cgroup: Remove stale cpu.rt.max reference from documentation
cpuset: replace direct lockdep_assert_held() with lockdep_assert_cpuset_lock_held()
cgroup/cpuset: Move the v1 empty cpus/mems check to cpuset1_validate_change()
cgroup/cpuset: Don't invalidate sibling partitions on cpuset.cpus conflict
cgroup/cpuset: Don't fail cpuset.cpus change in v2
cgroup/cpuset: Consistently compute effective_xcpus in update_cpumasks_hier()
cgroup/cpuset: Streamline rm_siblings_excl_cpus()
cpuset: remove dead code in cpuset-v1.c
cpuset: remove v1-specific code from generate_sched_domains
cpuset: separate generate_sched_domains for v1 and v2
cpuset: move update_domain_attr_tree to cpuset_v1.c
cpuset: add cpuset1_init helper for v1 initialization
cpuset: add cpuset1_online_css helper for v1-specific operations
cpuset: add lockdep_assert_cpuset_lock_held helper
cpuset: Remove unnecessary checks in rebuild_sched_domains_locked
cgroup: switch to css_is_online() helper
selftests: cgroup: Replace sleep with cg_read_key_long_poll() for waiting on nr_dying_descendants
selftests: cgroup: make test_memcg_sock robust against delayed sock stats
...
The init_enable_count test is flaky. The test forks 1024 children before
attaching the scheduler to verify that existing tasks get ops.init_task()
called. The children were using sleep(1) before exiting.
7900aa699c34 ("sched_ext: Fix cgroup exit ordering by moving sched_ext_free()
to finish_task_switch()") changed when tasks are removed from scx_tasks -
previously when the task_struct was freed, now immediately in
finish_task_switch() when the task dies.
Before the commit, pre-forked children would linger on scx_tasks until freed
regardless of when they exited, so the scheduler would always see them during
iteration. The sleep(1) was unnecessary. After the commit, children are
removed as soon as they die. The sleep(1) masks the problem in most cases but
the test becomes flaky depending on timing.
Fix by synchronizing properly using a pipe. All children block on read() and
the parent signals them to exit by closing the write end after attaching the
scheduler. The children are auto-reaped so there's no need to wait on them.
Reported-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Cc: David Vernet <void@manifault.com>
Cc: Andrea Righi <arighi@nvidia.com>
Cc: Changwoo Min <changwoo@igalia.com>
Cc: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Pull workqueue updates from Tejun Heo:
- Rework the rescuer to process work items one-by-one instead of
slurping all pending work items in a single pass.
As there is only one rescuer per workqueue, a single long-blocking
work item could cause high latency for all tasks queued behind it,
even after memory pressure is relieved and regular kworkers become
available to service them.
- Add CONFIG_BOOTPARAM_WQ_STALL_PANIC build-time option and
workqueue.panic_on_stall_time parameter for time-based stall panic,
giving systems more control over workqueue stall handling.
- Replace BUG_ON() with panic() in the stall panic path for clearer
intent and more informative output.
* tag 'wq-for-6.20' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
workqueue: replace BUG_ON with panic in panic_on_wq_watchdog
workqueue: add time-based panic for stalls
workqueue: add CONFIG_BOOTPARAM_WQ_STALL_PANIC option
workqueue: Process extra works in rescuer on memory pressure
workqueue: Process rescuer work items one-by-one using a cursor
workqueue: Make send_mayday() take a PWQ argument directly
A warning was detect:
WARNING: kernel/cgroup/cpuset.c:825 at rebuild_sched_domains_locked
Modules linked in:
CPU: 12 UID: 0 PID: 681 Comm: rmdir 6.19.0-rc6-next-20260121+
RIP: 0010:rebuild_sched_domains_locked+0x309/0x4b0
RSP: 0018:ffffc900019bbd28 EFLAGS: 00000202
RAX: ffff888104413508 RBX: 0000000000000008 RCX: ffff888104413510
RDX: ffff888109b5f400 RSI: 000000000000ffcf RDI: 0000000000000001
RBP: 0000000000000002 R08: ffff888104413508 R09: 0000000000000002
R10: ffff888104413508 R11: 0000000000000001 R12: ffff888104413500
R13: 0000000000000002 R14: ffffc900019bbd78 R15: 0000000000000000
FS: 00007fe274b8d740(0000) GS:ffff8881b6b3c000(0000) knlGS:
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe274c98b50 CR3: 00000001047a9000 CR4: 00000000000006f0
Call Trace:
<TASK>
update_prstate+0x1c7/0x580
cpuset_css_killed+0x2f/0x50
kill_css+0x32/0x180
cgroup_destroy_locked+0xa7/0x200
cgroup_rmdir+0x28/0x100
kernfs_iop_rmdir+0x4c/0x80
vfs_rmdir+0x12c/0x280
filename_rmdir+0x19e/0x200
__x64_sys_rmdir+0x23/0x40
do_syscall_64+0x6b/0x390
It can be reproduced by steps:
# cd /sys/fs/cgroup/
# mkdir A1
# mkdir B1
# mkdir C1
# echo 1-3 > A1/cpuset.cpus
# echo root > A1/cpuset.cpus.partition
# echo 3-5 > B1/cpuset.cpus
# echo root > B1/cpuset.cpus.partition
# echo 6 > C1/cpuset.cpus
# echo root > C1/cpuset.cpus.partition
# rmdir A1/
# rmdir C1/
Both A1 and B1 were initially configured with CPU 3, which was exclusively
assigned to A1's partition. When A1 was removed, CPU 3 was returned to the
root pool. However, B1 incorrectly regained access to CPU 3 when
update_cpumasks_hier was triggered during C1's removal, which also updated
sibling configurations.
The update_sibling_cpumasks function was called to synchronize siblings'
effective CPUs due to changes in their parent's effective CPUs. However,
parent effective CPU changes should not affect partition-effective CPUs.
To fix this issue, update_cpumasks_hier should only be invoked when the
sibling is not a valid partition in the update_sibling_cpumasks.
Fixes: 2a3602030d80 ("cgroup/cpuset: Don't invalidate sibling partitions on cpuset.cpus conflict")
Signed-off-by: Chen Ridong <chenridong@huawei.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Fix a pointer arithmetic error in scx_sdt during freeing that
causes the allocator to use the wrong memory address for the
allocation's data header.
Fixes: 36929ebd17ae ("tools/sched_ext: add arena based scheduler")
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Shinichiro reported a KASAN UAF, which is actually an out of bounds access
in the MMCID management code.
CPU0 CPU1
T1 runs in userspace
T0: fork(T4) -> Switch to per CPU CID mode
fixup() set MM_CID_TRANSIT on T1/CPU1
T4 exit()
T3 exit()
T2 exit()
T1 exit() switch to per task mode
---> Out of bounds access.
As T1 has not scheduled after T0 set the TRANSIT bit, it exits with the
TRANSIT bit set. sched_mm_cid_remove_user() clears the TRANSIT bit in
the task and drops the CID, but it does not touch the per CPU storage.
That's functionally correct because a CID is only owned by the CPU when
the ONCPU bit is set, which is mutually exclusive with the TRANSIT flag.
Now sched_mm_cid_exit() assumes that the CID is CPU owned because the
prior mode was per CPU. It invokes mm_drop_cid_on_cpu() which clears the
not set ONCPU bit and then invokes clear_bit() with an insanely large
bit number because TRANSIT is set (bit 29).
Prevent that by actually validating that the CID is CPU owned in
mm_drop_cid_on_cpu().
Fixes: 007d84287c74 ("sched/mmcid: Drop per CPU CID immediately when switching to per task mode")
Reported-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Cc: stable@vger.kernel.org
Closes: https://lore.kernel.org/aYsZrixn9b6s_2zL@shinmob
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Replace BUG_ON() with panic() in panic_on_wq_watchdog(). This is not
a bug condition but a deliberate forced panic requested by the user
via module parameters to crash the system for debugging purposes.
Using panic() instead of BUG_ON() makes this intent clearer and provides
more informative output about which threshold was exceeded and the actual
values, making it easier to diagnose the stall condition from crash dumps.
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
The current cgroup subsystem limit of 16 is insufficient, as the number of
existing subsystems has already reached this limit. When adding a new
subsystem that is not yet in the mainline kernel, building with
`make allmodconfig` requires first bypassing the
`BUILD_BUG_ON(CGROUP_SUBSYS_COUNT > 16)` restriction to allow compilation
to succeed. However, the kernel still fails to boot afterward.
This patch increases the maximum number of supported cgroup subsystems from
16 to 32, providing enough room for future subsystem additions.
Signed-off-by: Chen Ridong <chenridong@huawei.com>
Acked-by: Waiman Long <longman@redhat.com>
Tested-by: JP Kobryn <inwardvessel@gmail.com>
Acked-by: JP Kobryn <inwardvessel@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Add scx_bpf_error() calls when scx_bpf_create_dsq() fails in the remaining
schedulers to improve debuggability:
- scx_simple.bpf.c: simple_init()
- scx_sdt.bpf.c: sdt_init()
- scx_cpu0.bpf.c: cpu0_init()
- scx_flatcg.bpf.c: fcg_init()
This follows the same pattern established in commit 2f8d489897ae
("sched_ext: Add error logging for dsq creation failures") for other
schedulers and ensures consistent error reporting across all schedulers.
Signed-off-by: zhidao su <suzhidao@xiaomi.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Pull drm updates from Dave Airlie:
"Highlights:
- amdgpu support for lots of new IP blocks which means newer GPUs
- xe has a lot of SR-IOV and SVM improvements
- lots of intel display refactoring across i915/xe
- msm has more support for gen8 platforms
- Given up on kgdb/kms integration, it's too hard on modern hw
core:
- drop kgdb support
- replace system workqueue with percpu
- account for property blobs in memcg
- MAINTAINERS updates for xe + buddy
rust:
- Fix documentation for Registration constructors
- Use pin_init::zeroed() for fops initialization
- Annotate DRM helpers with __rust_helper
- Improve safety documentation for gem::Object::new()
- Update AlwaysRefCounted imports
- mm: Prevent integer overflow in page_align()
atomic:
- add drm_device pointer to drm_private_obj
- introduce gamma/degamma LUT size check
buddy:
- fix free_trees memory leak
- prevent BUG_ON
bridge:
- introduce drm_bridge_unplug/enter/exit
- add connector argument to .hpd_notify
- lots of recounting conversions
- convert rockchip inno hdmi to bridge
- lontium-lt9611uxc: switch to HDMI audio helpers
- dw-hdmi-qp: add support for HPD-less setups
- Algoltek AG6311 support
panels:
- edp: CSW MNE007QB3-1, AUO B140HAN06.4, AUO B140QAX01.H
- st75751: add SPI support
- Sitronix ST7920, Samsung LTL106HL02
- LG LH546WF1-ED01, HannStar HSD156J
- BOE NV130WUM-T08
- Innolux G150XGE-L05
- Anbernic RG-DS
dma-buf:
- improve sg_table debugging
- add tracepoints
- call clear_page instead of memset
- start to introduce cgroup memory accounting in heaps
- remove sysfs stats
dma-fence:
- add new helpers
dp:
- mst: avoid oob access with vcpi=0
hdmi:
- limit infoframes exposure to userspace
gem:
- reduce page table overhead with THP
- fix leak in drm_gem_get_unmapped_area
gpuvm:
- API sanitation for rust bindings
sched:
- introduce new helpers
panic:
- report invalid panic modes
- add kunit tests
i915/xe display:
- Expose sharpness only if num_scalers is >= 2
- Add initial Xe3P_LPD for NVL
- BMG FBC support
- Add MTL+ platforms to support dpll framework
_ fix DIMM_S DRM decoding on ICL
- Return to using AUX interrupts
- PSR/Panel replay refactoring
- use consolidation HDMI tables
- Xe3_LPD CD2X dividier changes
xe:
- vfio: add vfio_pci for intel GPU
- multi queue support
- dynamic pagemaps and multi-device SVM
- expose temp attribs in hwmon
- NO_COMPRESSION bo flag
- expose MERT OA unit
- sysfs survivability refactor
- SRIOV PF: add MERT support
- enable SR-IOV VF migration
- Enable I2C/NVM on Crescent Island
- Xe3p page reclaimation support
- introduce SRIOV scheduler groups
- add SoC remappt support in system controller
- insert compiler barriers in GuC code
- define NVL GuC firmware
- handle GT resume failure
- fix drm scheduler layering violations
- enable GSC loading and PXP for PTL
- disable GuC Power DCC strategy on PTL
- unregister drm device on probe error
i915:
- move to kernel standard fault injection
- bump recommended GuC version for DG2 and MTL
amdgpu:
- SMUIO 15.x, PSP 15.x support
- IH 6.1.1/7.1 support
- MMHUB 3.4/4.2 support
- GC 11.5.4/12.1 support
- SDMA 6.1.4/7.1/7.11.4 support
- JPEG 5.3 support
- UserQ updates
- GC 9 gfx queue reset support
- TTM memory ops parallelization
- convert legacy logging to new helpers
- DC analog fixes
amdkfd:
- GC 11.5.4/12.1 suppport
- SDMA 6.1.4/7.1 support
- per context support
- increase kfd process hash table
- Reserved SDMA rework
radeon:
- convert legacy logging to new helpers
- use devm for i2c adapters
msm:
- GPU
- Document a612/RGMU dt bindings
- UBWC 6.0 support (for A840 / Kaanapali)
- a225 support
- DPU:
- Switch to use virtual planes by default
- Fix DSI CMD panels on DPU 3.x
- Rewrite format handling to remove intermediate representation
- Fix watchdog on DPU 8.x+
- Fix TE / Vsync source setting on DPU 8.x+
- Add 3D_Mux on SC7280
- Kaanapali platform support
- Fix UBWC register programming
- Make RM reserve DSPP-enabled mixers for CRTCs with LMs
- Gamma correction support
- DP:
- Enable support for eDP 1.4+ link rate tables
- Fix MDSS1 DP indices on SA8775P, making them to work
- Fix msm_dp_ctrl_config_msa() to work with LLVM 20
- DSI:
- Document QCS8300 as compatible with SA8775P
- Kaanapali platform support
- DSI PHY:
- switch to divider_determine_rate()
- MDP5:
- Drop support for MSM8998, SDM660 and SDM630 (switch over to DPU)
- MDSS:
- Kaanapali platform support
- Fixed UBWC register programming
nova-core:
- Prepare for Turing support. This includes parsing and handling
Turing-specific firmware headers and sections as well as a Turing
Falcon HAL implementation
- Get rid of the Result<impl PinInit<T, E>> anti-pattern
- Relocate initializer-specific code into the appropriate initializer
- Use CStr::from_bytes_until_nul() to remove custom helpers
- Improve handling of unexpected firmware values
- Clean up redundant debug prints
- Replace c_str!() with native Rust C-string literals
- Update nova-core task list
nova:
- Align GEM object size to system page size
tyr:
- Use generated uAPI bindings for GpuInfo
- Replace manual sleeps with read_poll_timeout()
- Replace c_str!() with native Rust C-string literals
- Suppress warnings for unread fields
- Fix incorrect register name in print statement
nouveau:
- fix big page table support races in PTE management
- improve reclocking on tegra 186+
amdxdna:
- fix suspend race conditions
- improve handling of zero tail pointers
- fix cu_idx overwritten during command setup
- enable hardware context priority
- remove NPU2 support
- update message buffer allocation requirements
- update firmware version check
ast:
- support imported cursor buffers
- big endian fixes
etnaviv:
- add PPU flop reset support
imagination:
- add AM62P support
- introduce hw version checks
ivpu:
- implement warm boot flow
panfrost:
- add bo sync ioctl
- add GPU_PM_RT support for RZ/G3E SoC
panthor:
- add bo sync ioctl
- enable timestamp propagation
- scheduler robustness improvements
- VM termination fixes
- huge page support
rockchip:
- RK3368 HDMI Support
- get rid of atomic_check fixups
- RK3506 support
- RK3576/RK3588 improved HPD handling
rz-du:
- RZ/V2H(P) MIPI-DSI Support
v3d:
- fix DMA segment size
- convert to new logging helpers
mediatek:
- move DP training to hotplug thread
- convert logging to new helpers
- add support for HS speed DSI
- Genio 510/700/1200-EVK, Radxa NIO-12L HDMI support
atmel-hlcdc:
- switch to drmm resource
- support nomodeset
- use newer helpers
hisilicon:
- fix various DP bugs
renesas:
- fix kernel panic on reboot
exynos:
- fix vidi_connection_ioctl using wrong device
- fix vidi_connection deref user ptr
- fix concurrency regression with vidi_context
vkms:
- add configfs support for display configuration
* tag 'drm-next-2026-02-11' of https://gitlab.freedesktop.org/drm/kernel: (1610 commits)
drm/xe/pm: Disable D3Cold for BMG only on specific platforms
drm/xe: Fix kerneldoc for xe_tlb_inval_job_alloc_dep
drm/xe: Fix kerneldoc for xe_gt_tlb_inval_init_early
drm/xe: Fix kerneldoc for xe_migrate_exec_queue
drm/xe/query: Fix topology query pointer advance
drm/xe/guc: Fix kernel-doc warning in GuC scheduler ABI header
drm/xe/guc: Fix CFI violation in debugfs access.
accel/amdxdna: Move RPM resume into job run function
accel/amdxdna: Fix incorrect DPM level after suspend/resume
nouveau/vmm: start tracking if the LPT PTE is valid. (v6)
nouveau/vmm: increase size of vmm pte tracker struct to u32 (v2)
nouveau/vmm: rewrite pte tracker using a struct and bitfields.
accel/amdxdna: Fix incorrect error code returned for failed chain command
accel/amdxdna: Remove hardware context status
drm/bridge: imx8qxp-pixel-combiner: Fix bailout for imx8qxp_pc_bridge_probe()
drm/panel: ilitek-ili9882t: Remove duplicate initializers in tianma_il79900a_dsc
drm/i915/display: fix the pixel normalization handling for xe3p_lpd
drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to memory alloc/free
drm/exynos: vidi: fix to avoid directly dereferencing user pointer
drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()
...
Add a new module parameter 'panic_on_stall_time' that triggers a panic
when a workqueue stall persists for longer than the specified duration
in seconds.
Unlike 'panic_on_stall' which counts accumulated stall events, this
parameter triggers based on the duration of a single continuous stall.
This is useful for catching truly stuck workqueues rather than
accumulating transient stalls.
Usage:
workqueue.panic_on_stall_time=120
This would panic if any workqueue pool has been stalled for 120 seconds
or more.
The stall duration is measured from the workqueue last progress
(poll_ts) which accounts for legitimate system stalls.
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
cpu.rt.max was a proposed interface that never landed in mainline. Remove the
reference from cgroup-v2 documentation.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Orestis Floros <orestisflo@gmail.com>
Add a scheduler that uses BPF arenas to manage task context data.
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Pull media updates from Mauro Carvalho Chehab:
- Add support for GMSL1 and GMSL‑coax modules (PCI mgb4)
- Add driver for TI VIP
- AV1 – first kernel support (pixel‑format, decoder, transcoder)
- Three new camera‑sensor drivers (os05b10, s5k3m5, s5kjn1)
- Synopsys CSI‑2 receiver driver
- Verisilicon & rkvdec – major fixes and enhancements
- IPU6 (and 7) fixes and preparation for metadata
- omap3isp: v4l2-compliance updates
- Fix DVB streaming, drop wait_prepare/finish (dvb/vb2)
* tag 'media/v7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (307 commits)
media: uvcvideo: Pass allocation size directly to uvc_alloc_urb_buffer
media: uvcvideo: Fix allocation for small frame sizes
media: uvcvideo: Return queued buffers on start_streaming() failure
media: uvcvideo: Create an ID namespace for streaming output terminals
media: rkvdec: Add HEVC support for the VDPU383 variant
media: rkvdec: Add HEVC support for the VDPU381 variant
media: rkvdec: Add H264 support for the VDPU383 variant
media: rkvdec: Add H264 support for the VDPU381 variant
media: rkvdec: Disable multicore support
media: rkvdec: Enable all clocks without naming them
media: rkvdec: Support per-variant interrupt handler
media: rkvdec: Add RCB and SRAM support
media: rkvdec: Add variant specific coded formats list
media: rkvdec: Move hevc functions to common file
media: rkvdec: Move h264 functions to common file
media: rkvdec: Use structs to represent the HW RPS
media: rkvdec: Move cabac tables to their own source file
media: rkvdec: Switch to using structs instead of writel
media: visl: Add HEVC short and long term RPS sets
media: v4l2-ctrls: Add hevc_ext_sps_[ls]t_rps controls
...
- Fix CFI violation in debugfs access (Daniele)
- Kernel-doc fixes (Chaitanya, Shuicheng)
- Disable D3Cold for BMG only on specific platforms (Karthik)
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/aYStaLZVJWwKCDZt@intel.com
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