linux-kernel - Re: [PATCH 1/7] ACPICA: Only include ACPI asm files if ACPI is enabled

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Message-ID: <538FECD3.2000700@linaro.org>
Date:	Thu, 05 Jun 2014 12:06:43 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	"Zheng, Lv" <lv.zheng@...el.com>, Lee Jones <lee.jones@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"wsa@...-dreams.de" <wsa@...-dreams.de>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"devel@...ica.org" <devel@...ica.org>
Subject: Re: [PATCH 1/7] ACPICA: Only include ACPI asm files if ACPI is enabled

Hi Lv,

On 2014-6-5 8:56, Zheng, Lv wrote:
> Hi, Lee
> 
>> From: Lee Jones [mailto:lee.jones@...aro.org]
>> Sent: Wednesday, June 04, 2014 8:10 PM
>>
>> Any drivers which support ACPI and Device Tree probing need to include
>> both respective header files.  Without this patch, if a driver is being
>> used on a platform which does not support ACPI and subsequently does not
>> have the config option enabled, but includes linux/acpi.h the build
>> breaks with:
>>
>>   In file included from ../include/acpi/platform/acenv.h:150:0,
>>                    from ../include/acpi/acpi.h:56,
>>                    from ../include/linux/match.h:2,
>>                    from ../drivers/i2c/i2c-core.c:43:
>>   ../include/acpi/platform/aclinux.h:73:23:
>>    fatal error: asm/acenv.h: No such file or directory
>>    #include <asm/acenv.h>
>>                        ^
>> Cc: Lv Zheng <lv.zheng@...el.com>
>> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>> Cc: linux-acpi@...r.kernel.org
>> Cc: devel@...ica.org
>> Signed-off-by: Lee Jones <lee.jones@...aro.org>
>> ---
>>  include/acpi/platform/aclinux.h | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
>> index cd1f052..fdf7663 100644
>> --- a/include/acpi/platform/aclinux.h
>> +++ b/include/acpi/platform/aclinux.h
>> @@ -70,9 +70,10 @@
>>  #ifdef EXPORT_ACPI_INTERFACES
>>  #include <linux/export.h>
>>  #endif
>> -#include <asm/acenv.h>
>>
>> -#ifndef CONFIG_ACPI
>> +#ifdef CONFIG_ACPI
>> +#include <asm/acenv.h>
>> +#else
> 
> This is exactly what I want to do in the next step.
> But you are a bit faster here.
> I believe:
> The miss-ordered inclusions of <asm/acpi.h> is the culprit of all of the miss-ordered inclusions in arch/x86/include/asm.
> You should have noted that <asm/acpi.h> was originally unexpected included by some x86 specific headers.
> Simply doing <asm/acenv.h> exlusion in this way might be able to fix your issue for your architecture, but it could be very likely breaking x86 builds.
> You might be able to find another way to solve your build issue - for example, creating an empty <asm/acenv.h> for arch/arm.

Yes, we solve this issue as you suggested for arch/arm64.
since ARM32 will not support ACPI in the near future,
we may find another way to fix it.

Thanks
Hanjun

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