linux-kernel - Re: [PATCH] arm64: perf_event: Fix time

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Date:   Thu, 30 Apr 2020 18:04:36 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Will Deacon <will@...nel.org>, Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Al Grant <Al.Grant@....com>, James Clark <James.Clark@....com>,
        tglx@...utronix.de
Subject: Re: [PATCH] arm64: perf_event: Fix time_offset for arch timer

On Thu, Apr 30, 2020 at 04:29:23PM +0100, Marc Zyngier wrote:

> I wonder if we could/should make __sched_clock_offset available even when
> CONFIG_HAVE_UNSTABLE_SCHED_CLOCK isn't defined. It feels like it would
> help with this particular can or worm...

Errrgh. __sched_clock_offset is only needed on x86 because we transition
from one clock device to another on boot. It really shouldn't exist on
anything sane.

Let me try and understand your particular problem better.