linux-kernel - Re: [PATCH] x86: skip PIT initialization on modern chipsets

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Date:   Fri, 28 Jun 2019 15:26:07 +0800
From:   Daniel Drake <drake@...lessm.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
Cc:     hpa@...or.com, x86@...nel.org,
        Linux Upstreaming Team <linux@...lessm.com>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH] x86: skip PIT initialization on modern chipsets

Oops, please also add a reference to the main thread:

On Fri, Jun 28, 2019 at 3:23 PM Daniel Drake <drake@...lessm.com> wrote:
> Detect modern setups where we have no need for the PIT (e.g. where
> we already know the TSC and LAPIC timer frequencies, so no need
> to calibrate them against the PIT), and skip initialization PIT in
> such cases.
>
> Skip the IO-APIC timer-checking code when we don't have a PIT
> to test against (this was causing the panic).

Link: https://lore.kernel.org/lkml/CAD8Lp45fedoPLnK=UmUhhtkjy5u2h04sYKrx3U+m04U6FpVZ4A@mail.gmail.com

> Tested-by: Daniel Drake <drake@...lessm.com>