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7a884442ae
arm64 depends on the cpufreq driver to gain the maximum cpu frequency to convert the watchdog_thresh to perf event period. cpufreq drivers like cppc_cpufreq will be initialized lately after the initializing of the hard lockup detector so just use a safe cpufreq which will be inaccurency. Use a cpufreq notifier to adjust the event's period to a more accurate one. Reviewed-by: Jie Zhan <zhanjie9@hisilicon.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Link: https://lore.kernel.org/r/20250701110214.27242-3-yangyicong@huawei.com Signed-off-by: Will Deacon <will@kernel.org>