linux-kernel - Re: [PATCH v2 1/2] x86/acpi: add retrieval function for rsdp address

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Message-ID: <CAHp75Ved4nO7ktQ=1O5oRx4mNyWcA6YN9fATgMGW1OR0UxCd4g@mail.gmail.com>
Date:   Thu, 1 Feb 2018 17:45:02 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Juergen Gross <jgross@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        xen-devel@...ts.xenproject.org, Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stable <stable@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] x86/acpi: add retrieval function for rsdp address

On Thu, Feb 1, 2018 at 9:57 AM, Rafael J. Wysocki <rafael@...nel.org> wrote:
> On Wed, Jan 31, 2018 at 4:43 PM, Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
>> On Mon, Jan 29, 2018 at 5:02 AM, Rafael J. Wysocki <rafael@...nel.org> wrote:
>>> On Sun, Jan 28, 2018 at 4:04 PM, Andy Shevchenko
>>> <andy.shevchenko@...il.com> wrote:

>> Instead of declaring function as __weak, establish a new struct for
>> ACPI related stubs and incorporate it into x86_init.
>>
>> That is my proposal. I think I would go this way in my case where I
>> need to treat differently ACPI HW reduced initialization of legacy
>> devices.
>
> IOW you'd like to have a set of ACPI init callbacks that could be
> defined by an arch, right?

Correct!

And since there is another potential user (Xen) for this approach I
consider it a good chance to be chosen.
Though I have no idea if Xen can do things differently.

-- 
With Best Regards,
Andy Shevchenko