linux-kernel - Re: Regression in IO resource allocation

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Message-ID: <CAJZ5v0jOg-oTDEZodhLHD5iz039kKP-UCQoB92nZ8=_qhSa-HA@mail.gmail.com>
Date:	Wed, 1 Jun 2016 00:31:09 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Roland Dreier <roland@...estorage.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: Regression in IO resource allocation

On Tue, May 31, 2016 at 11:42 PM, Roland Dreier <roland@...estorage.com> wrote:
> On Tue, May 31, 2016 at 2:11 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>> Can you please try the appended patch (untested)?
>
> Thanks for the quick reply.  Patch looks OK on my system... it boots
> (which is very good :) and I see
>
>     system 00:01: [io  0x0400-0x047f] has been reserved
>
> however I don't see the "ACPI CPU throttle" region reserved in
> /proc/ioports... haven't debugged why acpi_processor_get_throttling()
> isn't getting called or what is happening yet.
>
> Will dig a bit deeper and let you know.

It may not be called at all if _PTC is used on that system, for example.