linux-kernel - Re: [PATCH v1] xen: ACPI: Get rid of ACPICA message printing

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Date:   Mon, 1 Mar 2021 20:18:06 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org,
        Konrad Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH v1] xen: ACPI: Get rid of ACPICA message printing

On 01.03.21 17:16, Boris Ostrovsky wrote:
> 
> On 3/1/21 9:11 AM, Rafael J. Wysocki wrote:
>> On Sun, Feb 28, 2021 at 2:49 AM Boris Ostrovsky
>> <boris.ostrovsky@...cle.com> wrote:
>>>
>>> On 2/24/21 1:47 PM, Rafael J. Wysocki wrote:
>>>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>>>
>>>> The ACPI_DEBUG_PRINT() macro is used in a few places in
>>>> xen-acpi-cpuhotplug.c and xen-acpi-memhotplug.c for printing debug
>>>> messages, but that is questionable, because that macro belongs to
>>>> ACPICA and it should not be used elsewhere.  In addition,
>>>> ACPI_DEBUG_PRINT() requires special enabling to allow it to actually
>>>> print the message and the _COMPONENT symbol generally needed for
>>>> that is not defined in any of the files in question.
>>>>
>>>> For this reason, replace all of the ACPI_DEBUG_PRINT() instances in
>>>> the Xen code with acpi_handle_debug() (with the additional benefit
>>>> that the source object can be identified more easily after this
>>>> change) and drop the ACPI_MODULE_NAME() definitions that are only
>>>> used by the ACPICA message printing macros from that code.
>>>>
>>>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>>> ---
>>>>   drivers/xen/xen-acpi-cpuhotplug.c |   12 +++++-------
>>>>   drivers/xen/xen-acpi-memhotplug.c |   16 +++++++---------
>>>
>>> As I was building with this patch I (re-)discovered that since 2013 it depends on BROKEN (commit 76fc253723add). Despite commit message there saying that it's a temporary patch it seems to me by now that it's more than that.
>>>
>>>
>>> And clearly noone tried to build these files since at least 2015 because memhotplug file doesn't compile due to commit cfafae940381207.
>>>
>>>
>>> While this is easily fixable the question is whether we want to keep these files. Obviously noone cares about this functionality.
>> Well, I would be for dropping them.
>>
>> Do you want me to send a patch to do that?
> 
> 
> Yes, if you don't mind (but let's give this a few days for people to have a chance to comment).

I'm fine with removing those files.


Juergen

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