linux

mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-10 20:48:12 +00:00

No description

C 96.8%
Assembly 0.9%
Rust 0.7%
Shell 0.6%
Python 0.5%
Other 0.3%

Find a file

Richa Bharti b03136582a cpufreq: intel_pstate: Check IDA only before MSR_IA32_PERF_CTL writes [ Upstream commit `4b747cc628` ] Commit `ac4e04d9e3` ("cpufreq: intel_pstate: Unchecked MSR aceess in legacy mode") introduced a check for feature X86_FEATURE_IDA to verify turbo mode support. Although this is the correct way to check for turbo mode support, it causes issues on some platforms that disable turbo during OS boot, but enable it later [1]. Before adding this feature check, users were able to get turbo mode frequencies by writing 0 to /sys/devices/system/cpu/intel_pstate/no_turbo post-boot. To restore the old behavior on the affected systems while still addressing the unchecked MSR issue on some Skylake-X systems, check X86_FEATURE_IDA only immediately before updates of MSR_IA32_PERF_CTL that may involve setting the Turbo Engage Bit (bit 32). Fixes: `ac4e04d9e3` ("cpufreq: intel_pstate: Unchecked MSR aceess in legacy mode") Reported-by: Aaron Rainbolt <arainbolt@kfocus.org> Closes: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2122531 [1] Tested-by: Aaron Rainbolt <arainbolt@kfocus.org> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> [ rjw: Subject adjustment, changelog edits ] Link: https://patch.msgid.link/20251111010840.141490-1-srinivas.pandruvada@linux.intel.com Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ richa: Backport to 6.12.y with context adjustments ] Signed-off-by: Richa Bharti <richa.bharti@siemens.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2026-01-11 15:25:21 +01:00
arch	powerpc/pseries/cmm: adjust BALLOON_MIGRATE when migrating pages	2026-01-08 10:15:05 +01:00
block	block: fix NULL pointer dereference in blk_zone_reset_all_bio_endio()	2026-01-08 10:15:06 +01:00
certs	sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3	2024-09-20 19:52:48 +03:00
crypto	crypto: seqiv - Do not use req->iv after crypto_aead_encrypt	2026-01-08 10:14:32 +01:00
Documentation	soundwire: stream: extend sdw_alloc_stream() to take 'type' parameter	2026-01-08 10:15:04 +01:00
drivers	cpufreq: intel_pstate: Check IDA only before MSR_IA32_PERF_CTL writes	2026-01-11 15:25:21 +01:00
fs	iomap: allocate s_dio_done_wq for async reads as well	2026-01-08 10:15:06 +01:00
include	mm: consider non-anon swap cache folios in folio_expected_ref_count()	2026-01-11 15:25:20 +01:00
init	init: handle bootloader identifier in kernel parameters	2025-10-19 16:33:50 +02:00
io_uring	io_uring: fix min_wait wakeups for SQPOLL	2026-01-08 10:14:25 +01:00
ipc	ipc: fix to protect IPCS lookups using RCU	2025-06-27 11:11:22 +01:00
kernel	sched_ext: Fix missing post-enqueue handling in move_local_task_to_local_dsq()	2026-01-08 10:14:58 +01:00
lib	idr: fix idr_alloc() returning an ID out of range	2026-01-08 10:14:50 +01:00
LICENSES	LICENSES: add 0BSD license text	2024-09-01 20:43:24 -07:00
mm	mm/page_alloc: change all pageblocks migrate type on coalescing	2026-01-11 15:25:20 +01:00
net	wifi: mac80211: Discard Beacon frames to non-broadcast address	2026-01-11 15:25:20 +01:00
rust	rust: kbuild: workaround `rustdoc` doctests modifier bug	2025-11-24 10:36:07 +01:00
samples	samples/ftrace: Adjust LoongArch register restore order in direct calls	2026-01-08 10:14:50 +01:00
scripts	kbuild: fix compilation of dtb specified on command-line without make rule	2026-01-08 10:14:34 +01:00
security	KEYS: trusted: Fix a memory leak in tpm2_load_cmd	2026-01-08 10:14:13 +01:00
sound	ASoC: renesas: rz-ssi: Fix rz_ssi_priv::hw_params_cache::sample_width	2026-01-08 10:15:04 +01:00
tools	tools/mm/page_owner_sort: fix timestamp comparison for stable sorting	2026-01-08 10:14:50 +01:00
usr	kbuild: uapi: Strip comments before size type check	2025-11-13 15:34:35 -05:00
virt	KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot	2026-01-08 10:14:21 +01:00
.clang-format	clang-format: Update with v6.11-rc1's `for_each` macro list	2024-08-02 13:20:31 +02:00
.clippy.toml	rust: give Clippy the minimum supported Rust version	2025-08-01 09:48:44 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.editorconfig	.editorconfig: remove trim_trailing_whitespace option	2024-06-13 16:47:52 +02:00
.get_maintainer.ignore	Add Jeff Kirsher to .get_maintainer.ignore	2024-03-08 11:36:54 +00:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	rust: introduce `.clippy.toml`	2025-03-13 13:01:42 +01:00
.mailmap	mailmap: add entry for Thorsten Blum	2024-11-07 14:14:59 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Remove self from DSA entry	2024-11-03 12:52:38 -08:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	staging: rtl8712: Remove driver using deprecated API wext	2025-12-07 06:25:02 +09:00
Makefile	Linux 6.12.64	2026-01-08 10:15:06 +01:00
README	README: Fix spelling	2024-03-18 03:36:32 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.