linux-kernel - Re: [PATCH v3] ARM64: Dynamically allocate cpumasks and increase supported CPUs to 512

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Date: Tue, 12 Mar 2024 10:06:06 -0700 (PDT)
From: "Christoph Lameter (Ampere)" <cl@...ux.com>
To: Catalin Marinas <catalin.marinas@....com>
cc: Marek Szyprowski <m.szyprowski@...sung.com>, 
    Mark Rutland <mark.rutland@....com>, 
    "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, 
    "Rafael J. Wysocki" <rafael@...nel.org>, Viresh Kumar <vireshk@...nel.org>, 
    Will Deacon <will@...nel.org>, Jonathan.Cameron@...wei.com, 
    Matteo.Carlini@....com, Valentin.Schneider@....com, 
    akpm@...ux-foundation.org, anshuman.khandual@....com, 
    Eric Mackay <eric.mackay@...cle.com>, dave.kleikamp@...cle.com, 
    linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
    linux-mm@...ck.org, linux@...linux.org.uk, robin.murphy@....com, 
    vanshikonda@...amperecomputing.com, yang@...amperecomputing.com, 
    Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCH v3] ARM64: Dynamically allocate cpumasks and increase
 supported CPUs to 512

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?