linux-kernel - Re: [PATCH v2 3/5] ACPICA: Add <asm/acenv.h> to remove mis-ordered inclusion of <asm/acpi.h> from <acpi/platform/aclinux.h>.

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Message-ID: <535EBA4B.5090305@intel.com>
Date:	Mon, 28 Apr 2014 22:30:03 +0200
From:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To:	"Zheng, Lv" <lv.zheng@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	"Brown, Len" <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v2 3/5] ACPICA: Add <asm/acenv.h> to remove mis-ordered
 inclusion of <asm/acpi.h> from <acpi/platform/aclinux.h>.

On 4/28/2014 5:02 AM, Zheng, Lv wrote:
> Hi, Rafael
>
>> From: linux-acpi-owner@...r.kernel.org [mailto:linux-acpi-owner@...r.kernel.org] On Behalf Of Rafael J. Wysocki
>> Sent: Monday, April 28, 2014 5:37 AM
>> To: Zheng, Lv
>>
>> On Wednesday, April 23, 2014 02:54:06 PM Lv Zheng wrote:
>>> There is a mis-order inclusion for <asm/acpi.h>.
>>>
>>> As we will enforce including <linux/acpi.h> for all Linux ACPI users, we
>>> can find the inclusion order is as follows:
>>>
>>> <linux/acpi.h>
>>>    <acpi/acpi.h>
>>>     <acpi/platform/acenv.h>
>>>      (acenv.h before including aclinux.h)
>>>      <acpi/platform/aclinux.h>
>>> ...........................................................................
>>>       (aclinux.h before including asm/acpi.h)
>>>       <asm/acpi.h>                             @Redundant@
>>>        (ACPICA specific stuff)
>>> ...........................................................................
>>> ...........................................................................
>>>        (Linux ACPI specific stuff) ? - - - - - - - - - - - - +
>>>       (aclinux.h after including asm/acpi.h)   @Invisible@   |
>>>      (acenv.h after including aclinux.h)       @Invisible@   |
>>>     other ACPICA headers                       @Invisible@   |
>>> ............................................................|..............
>>>    <acpi/acpi_bus.h>                                         |
>>>    <acpi/acpi_drivers.h>                                     |
>>>    <asm/acpi.h> (Excluded)                                   |
>>>     (Linux ACPI specific stuff) ! <- - - - - - - - - - - - - +
>>>
>>> NOTE that, in ACPICA, <acpi/platform/acenv.h> is more like Kconfig
>>> generated <generated/autoconf.h> for Linux, it is meant to be included
>>> before including any ACPICA code.
>>>
>>> In the above figure, there is a question mark for "Linux ACPI specific
>>> stuff" in <asm/acpi.h> which should be included after including all other
>>> ACPICA header files.  Thus they really need to be moved to the position
>>> marked with exclaimation mark or the definitions in the blocks marked with
>>> "@Invisible@" will be invisible to such architecture specific "Linux ACPI
>>> specific stuff" header blocks.  This leaves 2 issues:
>>> 1. All environmental definitions in these blocks should have a copy in the
>>>     area marked with "@Redundant@" if they are required by the "Linux ACPI
>>>     specific stuff".
>>> 2. We cannot use any ACPICA defined types in <asm/acpi.h>.
>>>
>>> This patch splits architecture specific ACPICA stuff from <asm/acpi.h> to
>>> fix this issue.
>>>
>>> Signed-off-by: Lv Zheng <lv.zheng@...el.com>
>>> Cc: Tony Luck <tony.luck@...el.com>
>>> Cc: Fenghua Yu <fenghua.yu@...el.com>
>>> Cc: linux-ia64@...r.kernel.org
>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>> Cc: Ingo Molnar <mingo@...hat.com>
>>> Cc: "H. Peter Anvin" <hpa@...or.com>
>>> Cc: x86@...nel.org
>>> ---
>>>   arch/ia64/include/asm/acenv.h   |   71 +++++++++++++++++++++++++++++++++++++++
>>>   arch/ia64/include/asm/acpi.h    |   50 ---------------------------
>>>   arch/x86/include/asm/acenv.h    |   65 +++++++++++++++++++++++++++++++++++
>>>   arch/x86/include/asm/acpi.h     |   45 -------------------------
>>>   include/acpi/platform/aclinux.h |    2 +-
>> Please rename the files first (in a separate patch) and then modify the
>> renamed ones.  That will make changes much easier to follow.
> This patch doesn't provide a rename.
> Currently, <asm/acpi.h> includes:
> 1. arch specific ACPI stuff
> 2. arch specific ACPICA stuff
> This patch moves "2" to a separate file <asm/acenv.h>, thus no renaming happens here.

Ah, I overlooked that, sorry.

Which I might not do if the changelog said what the patch was really doing.

Thanks,
Rafael

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