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Linus Torvalds 303bff3637 Core features:
- Remove big-endian kernel support: CONFIG_CPU_BIG_ENDIAN has depended
    on BROKEN for a while, so drop the remaining code (BE hypervisor
    object, BPF JIT, assembly/crypto/library routines, endianness helper
    macros, selftests) and force a little-endian build
 
  - Add preemptible this_cpu_*() operations (read/write, RMW, xchg,
    cmpxchg and cmpxchg128) that no longer need to disable preemption
    around the per-CPU address generation and access
 
  - Preparation patches for implementing CONFIG_HOTPLUG_PARALLEL on
    arm64
 
 Memory management:
 
  - Treat faults taken by EFI runtime firmware as kernel faults
 
  - Clear PTE_WRITE for EFI_MEMORY_RO mappings (with hardware dirty state
    management enabled, this is not truly read-only)
 
  - Raise the default ARCH_MMAP_RND_BITS for 48-bit and 52-bit VA
    configurations (28/26/24 bits for 4K/16K/64K pages)
 
  - Implement clear_page[s]() using memset()
 
  - Enable BBML2 no-abort (a.k.a. BBML3) for the NVIDIA Rigel CPU
 
 Perf and PMU:
 
  - Support for HiSilicon's ITS PMU
 
  - Add support for some new events: INST_SIMD_ALU_VEC for Apple PMUs and
    a cycle counter for the latest version of HiSilicon's MN PMU hardware
 
  - A bunch of fixes to the CXL PMU driver to address pre-existing issues
    from Sashiko
 
  - Fix generation of PERF_RECORD_ITRACE_START records for SPE and ETM
    drivers
 
  - Reduce excessive stack consumption in the Marvell DDR PMU driver
 
  - Minor driver updates and cleanups all over
 
 Arm Confidential Compute Architecture (CCA):
 
  - Add an Arm SMCCC bus for firmware services discovered through SMCCC
    and move the TRNG and CCA guest (TSM provider) drivers onto it,
    removing the dummy CCA platform device and adding a sysfs ABI for
    Realm guests
 
  - Move the Realm Service Interface (RSI) code out of arch/arm64/ into
    drivers/firmware/arm_rmm/
 
  - Add the host side of the Realm Management Interface (RMI): detect,
    configure and activate the RMM, add SRO support and wrappers for the
    Realm RMI commands
 
  - Block hibernation (new arch hook in the PM core) and kexec while the
    RMM is active. To be revisited in the future with proper support for
    deactivation
 
  - Handle Granule Protection Faults (GPFs) taken by the host, caused by
    accesses to memory delegated to the RMM. In a future patch, the
    exception table lookup will be limited to is_kdump_kernel() cases
 
 MPAM (Memory Partitioning And Monitoring):
 
  - Add support for the MPAM firmware-backed (Fb) interface, allowing
    MSC accesses to be mediated by firmware
 
  - Fix a list of theoretical issues with the driver (MSC access error
    propagation, MBWU monitor save/restore and locking, resctrl class
    handling, error interrupt restore, maximum number of PARTIDs)
 
  - Add the mailing list and a missing file to the MAINTAINERS entry
 
  - Document when to set arm64.nompam
 
 Errata and CPU features:
 
  - Add the NXP i.MX8QM/8QP workaround for the Cortex-A53 cache coherency
    issue (ERR050104), using a new ARM64_CPUCAP_SOC_ERRATUM capability
    type for SoC-level errata
 
 Miscellaneous:
 
  - Mask debug exceptions (DAIF) around the hardware breakpoint register
    manipulations when called from generic kernel code
 
  - Don't zero the SVE state buffer when the SVE state is live
 
  - Return -EPERM instead of -EBUSY from the GCS prctl() locking
    failures (matching x86), with the selftest updated. Slight ABI change
    but no software deployment yet
 
  - kselftest: fix unsound MTE fault skipping by introducing MTE-safe
    memory accessors, avoid copying each signal test binary more than
    once
 
  - Update sysreg definitions (fix three enum values and two field names,
    mark architecturally dropped fields as RES0) and remove the TME
    transaction state check from the BRBE driver
 
  - Fix the description of ARM64_HAS_LPA2 and remove a redundant
    ID_AA64MMFR0 define
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 updates from Catalin Marinas:
 "Here are the arm64 updates for 7.4.

  The more interesting bits are the removal of big-endian kernel support
  (already marked BROKEN for some time), preemptible this_cpu_*()
  operations and MPAM support for the firmware-backed (Fb) interface.

  CCA (Arm's confidential compute) is slowly trickling in with host RMI
  (Realm Management Interface) support and some refactoring, including a
  dedicated SMCCC bus to advertise firmware services. There are also the
  usual PMU updates for new hardware and a few fixes/cleanups.

  Core features:

   - Remove big-endian kernel support: CONFIG_CPU_BIG_ENDIAN has
     depended on BROKEN for a while, so drop the remaining code (BE
     hypervisor object, BPF JIT, assembly/crypto/library routines,
     endianness helper macros, selftests) and force a little-endian
     build

   - Add preemptible this_cpu_*() operations (read/write, RMW, xchg,
     cmpxchg and cmpxchg128) that no longer need to disable preemption
     around the per-CPU address generation and access

   - Preparation patches for implementing CONFIG_HOTPLUG_PARALLEL on
     arm64

  Memory management:

   - Treat faults taken by EFI runtime firmware as kernel faults

   - Clear PTE_WRITE for EFI_MEMORY_RO mappings (with hardware dirty
     state management enabled, this is not truly read-only)

   - Raise the default ARCH_MMAP_RND_BITS for 48-bit and 52-bit VA
     configurations (28/26/24 bits for 4K/16K/64K pages)

   - Implement clear_page[s]() using memset()

   - Enable BBML2 no-abort (a.k.a. BBML3) for the NVIDIA Rigel CPU

  Perf and PMU:

   - Support for HiSilicon's ITS PMU

   - Add support for some new events: INST_SIMD_ALU_VEC for Apple PMUs
     and a cycle counter for the latest version of HiSilicon's MN PMU
     hardware

   - A bunch of fixes to the CXL PMU driver to address pre-existing
     issues from Sashiko

   - Fix generation of PERF_RECORD_ITRACE_START records for SPE and ETM
     drivers

   - Reduce excessive stack consumption in the Marvell DDR PMU driver

   - Minor driver updates and cleanups all over

  Arm Confidential Compute Architecture (CCA):

   - Add an Arm SMCCC bus for firmware services discovered through SMCCC
     and move the TRNG and CCA guest (TSM provider) drivers onto it,
     removing the dummy CCA platform device and adding a sysfs ABI for
     Realm guests

   - Move the Realm Service Interface (RSI) code out of arch/arm64/ into
     drivers/firmware/arm_rmm/

   - Add the host side of the Realm Management Interface (RMI): detect,
     configure and activate the RMM, add SRO support and wrappers for
     the Realm RMI commands

   - Block hibernation (new arch hook in the PM core) and kexec while
     the RMM is active. To be revisited in the future with proper
     support for deactivation

   - Handle Granule Protection Faults (GPFs) taken by the host, caused
     by accesses to memory delegated to the RMM. In a future patch, the
     exception table lookup will be limited to is_kdump_kernel() cases

  MPAM (Memory Partitioning And Monitoring):

   - Add support for the MPAM firmware-backed (Fb) interface, allowing
     MSC accesses to be mediated by firmware

   - Fix a list of theoretical issues with the driver (MSC access error
     propagation, MBWU monitor save/restore and locking, resctrl class
     handling, error interrupt restore, maximum number of PARTIDs)

   - Add the mailing list and a missing file to the MAINTAINERS entry

   - Document when to set arm64.nompam

  Errata and CPU features:

   - Add the NXP i.MX8QM/8QP workaround for the Cortex-A53 cache
     coherency issue (ERR050104), using a new ARM64_CPUCAP_SOC_ERRATUM
     capability type for SoC-level errata

  Miscellaneous:

   - Mask debug exceptions (DAIF) around the hardware breakpoint
     register manipulations when called from generic kernel code

   - Don't zero the SVE state buffer when the SVE state is live

   - Return -EPERM instead of -EBUSY from the GCS prctl() locking
     failures (matching x86), with the selftest updated. Slight ABI
     change but no software deployment yet

   - kselftest: fix unsound MTE fault skipping by introducing MTE-safe
     memory accessors, avoid copying each signal test binary more than
     once

   - Update sysreg definitions (fix three enum values and two field
     names, mark architecturally dropped fields as RES0) and remove the
     TME transaction state check from the BRBE driver

   - Fix the description of ARM64_HAS_LPA2 and remove a redundant
     ID_AA64MMFR0 define"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (144 commits)
  arm64: cpufeature: Enable BBML2 for NVIDIA Rigel
  arm64: cputype: Add NVIDIA Rigel definitions
  arm64: raise default ARCH_MMAP_RND_BITS for 48-bit and 52-bit VA
  arm64/debug: mask debug exceptions when called from common code
  kselftest/arm64: signal: copy each test binary only once
  kselftest/arm64: Check for -EPERM not -EBUSY in the locking test
  arm64: gcs: Return -EPERM not -EBUSY for prctl() locking failures
  perf: arm_brbe: Remove the check for TME transaction states
  arm64: sysreg: Mark fields the architecture dropped as RES0
  arm64: sysreg: Fix the names of two misspelt fields
  arm64: sysreg: Fix three incorrect enum values
  arm64: smp: Defer RCU registration during secondary CPU bringup
  arm64: smp: Don't bother printing the I-cache policy for each CPU
  arm64: smp: Defer update of secondary CPU capabilities
  arm64: smp: Tidy up cpuinfo init and cpufeature updates
  arm64: smp: Tidy up smp_prepare_cpus()
  arm64: cpufeature: Store every ID register with its overrides applied
  arm64: cpufeature: Read MPAMIDR_EL1 in __cpuinfo_store_cpu()
  arm64: cpufeature: Add read_cpuid_with_overrides()
  arm64: cpufeature: Check arm64_ftr_regs[] before the first store
  ...
2026-10-20 07:55:19 -10:00
arch Core features: 2026-10-20 07:55:19 -10:00
block vfs-7.4-rc1.iomap 2026-10-19 18:33:02 -10:00
certs treewide: fix indentation and whitespace in Kconfig files 2026-05-28 21:24:42 -07:00
crypto crypto: aes - Fix undesired override of some optimized AES modes 2026-09-30 08:38:06 -07:00
Documentation Core features: 2026-10-20 07:55:19 -10:00
drivers Core features: 2026-10-20 07:55:19 -10:00
fs vfs-7.4-rc1.sync_close 2026-10-19 21:03:21 -10:00
include Core features: 2026-10-20 07:55:19 -10:00
init vfs-7.4-rc1.misc 2026-10-19 19:30:45 -10:00
io_uring vfs-7.4-rc1.file 2026-10-19 17:35:50 -10:00
ipc vfs-7.4-rc1.idmap 2026-10-19 17:57:49 -10:00
kernel Core features: 2026-10-20 07:55:19 -10:00
lib Crypto library fixes for 7.3-final 2026-10-14 08:23:37 -07:00
LICENSES LICENSES: Add modern form of the LGPL-2.1 tags to the usage guide section 2025-10-22 07:58:19 +02:00
mm vfs-7.4-rc1.idmap 2026-10-19 17:57:49 -10:00
net vfs-7.4-rc1.shared.net-next.pidfd 2026-10-19 20:32:52 -10:00
rust rust: net: netlink: validate attribute length before casting to c_int 2026-09-29 12:28:03 +02:00
samples samples: pidfd: fix userprogs typo 2026-10-14 22:08:01 +02:00
scripts Core features: 2026-10-20 07:55:19 -10:00
security vfs-7.4-rc1.idmap 2026-10-19 17:57:49 -10:00
sound ASoC: amd: yc: disable MSI on resume 2026-10-13 14:32:22 +01:00
tools Core features: 2026-10-20 07:55:19 -10:00
usr usr: Correct a spelling by changing a letter 2026-08-05 14:51:58 +02:00
virt vfs-7.4-rc1.idmap 2026-10-19 17:57:49 -10:00
.clang-format drm/bridge: rename drm_for_each_bridge_in_chain_scoped() to drm_for_each_bridge_in_chain() 2026-07-14 17:55:51 +02:00
.clippy.toml rust: bump Clippy's MSRV and clean incompatible_msrv allows 2026-04-07 09:51:39 +02:00
.cocciconfig
.editorconfig editorconfig: add rst extension 2026-01-26 19:07:09 -08:00
.get_maintainer.ignore .get_maintainer.ignore: add myself 2026-09-07 10:01:33 +02:00
.gitattributes
.gitignore SPDX patches for 7.2-rc1 2026-06-22 12:06:22 -07:00
.mailmap 7 hotfixes. 4 are cc:stable. 2026-10-08 12:35:20 +02:00
.pylintrc docs: Move the python libraries to tools/lib/python 2025-11-18 09:22:40 -07:00
.rustfmt.toml
COPYING
CREDITS vfs-7.4-rc1.bfs 2026-10-19 16:55:31 -10:00
Kbuild checksyscalls: move instance functionality into generic code 2026-04-05 09:21:32 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS Core features: 2026-10-20 07:55:19 -10:00
Makefile Linux 7.3 2026-10-18 13:14:58 -10:00
README README: remove out of place emdashes 2026-07-15 10:51:29 -06:00

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