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There is a corner case where the desired_perf is exactly same as the old perf, but the actual current freq is not. This happens during S3 while the cpufreq governor is set to powersave. During cpufreq resume process, the booting CPU's new_freq obtained via .get() is the highest frequency, while the policy->cur and cpu->perf_ctrls.desired_perf are set to the lowest level (powersave governor). This causes the warning: "CPU frequency out of sync:", and the cpufreq core sets policy->cur to new_freq. Then the governor->limits() calls cppc_cpufreq_set_target() to configures the CPU frequency and returns directly because the desired_perf converted from target_freq is same as the cpu->perf_ctrls.desired_perf and both are the lowest_perf. Since target_freq and policy->cur have been already compared in __cpufreq_driver_target(), there's no need to compare them again here. Drop the comparison. Signed-off-by: Riwen Lu <luriwen@kylinos.cn> [ Viresh: Updated commit message / subject ] Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
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| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
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| MAINTAINERS | ||
| Makefile | ||
| 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.