Catcrafts/milos-linux

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Rafael J. Wysocki f97aef092e cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency Commit `a755d0e2d4` ("cpufreq: Honour transition_latency over transition_delay_us") caused platforms where cpuinfo.transition_latency is CPUFREQ_ETERNAL to get a very large transition latency whereas previously it had been capped at 10 ms (and later at 2 ms). This led to a user-observable regression between 6.6 and 6.12 as described by Shawn: "The dbs sampling_rate was 10000 us on 6.6 and suddently becomes 6442450 us (4294967295 / 1000 * 1.5) on 6.12 for these platforms because the default transition delay was dropped [...]. It slows down dbs governor's reacting to CPU loading change dramatically. Also, as transition_delay_us is used by schedutil governor as rate_limit_us, it shows a negative impact on device idle power consumption, because the device gets slightly less time in the lowest OPP." Evidently, the expectation of the drivers using CPUFREQ_ETERNAL as cpuinfo.transition_latency was that it would be capped by the core, but they may as well return a default transition latency value instead of CPUFREQ_ETERNAL and the core need not do anything with it. Accordingly, introduce CPUFREQ_DEFAULT_TRANSITION_LATENCY_NS and make all of the drivers in question use it instead of CPUFREQ_ETERNAL. Also update the related Rust binding. Fixes: `a755d0e2d4` ("cpufreq: Honour transition_latency over transition_delay_us") Closes: https://lore.kernel.org/linux-pm/20250922125929.453444-1-shawnguo2@yeah.net/ Reported-by: Shawn Guo <shawnguo@kernel.org> Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org> Reviewed-by: Jie Zhan <zhanjie9@hisilicon.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Cc: 6.6+ <stable@vger.kernel.org> # 6.6+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Link: https://patch.msgid.link/2264949.irdbgypaU6@rafael.j.wysocki [ rjw: Fix typo in new symbol name, drop redundant type cast from Rust binding ] Tested-by: Shawn Guo <shawnguo@kernel.org> # with cpufreq-dt driver Reviewed-by: Qais Yousef <qyousef@layalina.io> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		2025-10-01 13:56:24 +02:00
arch	Merge back earlier cpufreq material for 6.18	2025-09-24 21:32:28 +02:00
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Documentation	Merge back earlier cpufreq material for 6.18	2025-09-24 21:32:28 +02:00
drivers	cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency	2025-10-01 13:56:24 +02:00
fs	for-6.17-rc7-tag	2025-09-24 11:09:09 -07:00
include	cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency	2025-10-01 13:56:24 +02:00
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kernel	sched_ext: Fixes for v6.17-rc7	2025-09-22 11:28:52 -07:00
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rust	cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency	2025-10-01 13:56:24 +02:00
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tools	amd-pstate content for 6.18	2025-09-24 21:33:56 +02:00
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MAINTAINERS	Merge back earlier cpufreq material for 6.18	2025-09-24 21:32:28 +02:00
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README

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.