Messages in this thread | | | Subject | Re: [PATCH -next] arm64: Export __cpu_logical_map | From | Sumit Gupta <> | Date | Sun, 26 Jul 2020 17:16:27 +0530 |
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>>> ERROR: modpost: "__cpu_logical_map" [drivers/cpufreq/tegra194-cpufreq.ko] undefined! >>> >>> ARM64 tegra194-cpufreq driver use cpu_logical_map, export >>> __cpu_logical_map to fix build issue. >>> > > I wonder why like other instances in the drivers, the mpidr is not get > directly from the cpu. The cpufreq_driver->init call happens when the cpu > is being brought online and is executed on the required cpu IIUC. > Yes, this occurs during hotplug case. But in the case of system boot, 'cpufreq_driver->init' is called later during cpufreq platform driver's probe. The value of CPU in 'policy->cpu' can be different from the current CPU. That's why read_cpuid_mpidr() can't be used.
> read_cpuid_mpidr() is inline and avoids having to export the logical_cpu_map. > Though we may not add physical hotplug anytime soon, less dependency > on this cpu_logical_map is better given that we can resolve this without > the need to access the map. > > -- > Regards, > Sudeep >
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