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Architecture's using perf events for hard lockup detection needs to convert the watchdog_thresh to the event's period, some architecture for example arm64 perform this conversion using the CPU's maximum frequency which will be acquired by cpufreq. However by the time the lockup detector's initialized the cpufreq driver may not be initialized, thus launch a watchdog with inaccurate period. Provide a function hardlockup_detector_perf_adjust_period() to allowing adjust the event period. Then architecture can update with more accurate period if cpufreq is initialized. Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Link: https://lore.kernel.org/r/20250701110214.27242-2-yangyicong@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
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.