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Date:   Wed, 7 Jul 2021 12:01:38 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Lukasz Luba <lukasz.luba@arm.com>
Cc:     linux-kernel@vger.kernel.org, Chris.Redpath@arm.com,
        dietmar.eggemann@arm.com, morten.rasmussen@arm.com,
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        segall@google.com, mgorman@suse.de, bristot@redhat.com,
        CCj.Yeh@mediatek.com
Subject: Re: [PATCH 2/3] PM: EM: Make em_cpu_energy() able to return bigger
 values
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On Wed, Jul 07, 2021 at 09:09:08AM +0100, Lukasz Luba wrote:
> For now we would live with this simple code which improves
> all recent 64bit platforms and is easy to take it into Android
> common kernel. The next step would be more scattered across
> other subsystems, so harder to backport to Android 5.4 and others.

Ah, you *do* only care about 64bit :-) So one option is to only increase
precision for 64BIT builds, just like we do for scale_load() and
friends.