Re: [PATCH -next] arm64: Export __cpu_logical_map

From: Sudeep Holla
Date: Fri Jul 24 2020 - 09:11:07 EST

On Fri, Jul 24, 2020 at 11:08:03AM +0800, Kefeng Wang wrote:
> +maillist
> On 2020/7/24 11:04, Kefeng Wang wrote:
> > 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.

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.