Date: Fri, 14 Jul 2017 17:01:01 +0200
From: Julian Wollrath <jwollrath@web.de>
To: Dou Liyang <douly.fnst@cn.fujitsu.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: A question about acpi_early_init(), and want to invoke
 acpi_early_init() earlier
Message-ID: <20170714170101.3edfaf46@saldaea>
In-Reply-To: <66904bb8-36ca-beb3-f19c-4796aae743df@cn.fujitsu.com>
References: <b94f8c2e-394f-108b-155b-17fb3f9c4772@cn.fujitsu.com>
        <66904bb8-36ca-beb3-f19c-4796aae743df@cn.fujitsu.com>
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Hi,

> > I reproduced it by the following command line:
> >     ...noapic acpi_sci=level...
> >
> > the original dmesg is:
> >
> > [    0.000000] tsc: Fast TSC calibration using PIT
> >
> > the broken dmesg is:
> >
> > [    0.001000] tsc: PIT calibration matches HPET. 1 loops
> >
> > Is it right? If it is wrong, please give the right process for
> > reproducing.
yes, this is right, see [1] for the original thread.

The earliest I could move the call of acpi_early_init() without
triggering the bug back than is shown in the patch at [2] but
unforunately I do not have access to the Thinkpad X121e I had back than
anymore, so I cannot help with regression testing.

Cheers,
Julian

[1] https://lkml.org/lkml/2014/3/10/123
[2] https://lkml.org/lkml/2014/3/11/424

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