[PATCH v3] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512
Christoph Lameter (Ampere)
cl at linux.com
Tue Mar 12 10:06:06 PDT 2024
On Mon, 11 Mar 2024, Christoph Lameter (Ampere) wrote:
> This could be an issue in the ARM64 arch code itself where there maybe an
> assumption elsewhere that a cpumask can always store up to NR_CPU cpus and
> not only nr_cpu_ids as OFFSTACK does.
>
> How can I exercise the opp driver in order to recreate the problem?
>
> I assume the opp driver is ARM specific? x86 defaults to OFFSTACK so if there
> is an issue with OFFSTACK in opp then it should fail with kernel default
> configuration on that platform.
I checked the ARM64 arch sources use of NR_CPUS and its all fine.
Also verified in my testing logs that CONFIG_PM_OPP was set in all tests.
No warnings in the kernel log during those tests.
How to reproduce this?
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