Messages in this thread | | | From | Krzysztof Kozlowski <> | Date | Wed, 30 May 2018 14:32:12 +0200 | Subject | Re: [PATCH 07/15] arm: dts: exynos: Add missing cooling device properties for CPUs |
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On Wed, May 30, 2018 at 6:38 AM, Viresh Kumar <viresh.kumar@linaro.org> wrote: > On 29-05-18, 15:18, Krzysztof Kozlowski wrote: >> Thanks for the patch. >> >> In case of Exynos, the booting CPU always has these information in DT >> and the booting CPU cannot be changed (chosen by firmware/hardware >> configuration). > > But can the booting CPU be offlined ? > > If yes, then this is how things are broken right now. > > Build cpufreq driver as module, boot kernel, hotplug out CPU0, insert > cpufreq driver and that will try to find these properties in CPU1.
OK, I see the possibility although it is still far away from use cases. You cannot hotplug booting CPU (CPU0) on Exynos kernels. It never worked. Strictly speaking - offlining will work. But bringing it online will likely hang the system.
Best regards, Krzysztof
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