From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
To: Takashi Iwai <tiwai@suse.de>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Mark Brown <broonie@kernel.org>, Wolfram Sang <wsa@the-dreams.de>,
linux-acpi@vger.kernel.org, alsa-devel@alsa-project.org,
linux-i2c@vger.kernel.org, linux-spi@vger.kernel.org
Subject: Re: [alsa-devel] [PATCHv3 1/3] ACPI: Provide struct acpi_device stub for !CONFIG_ACPI builds
Date: Thu, 14 Nov 2013 13:14:17 +0200 [thread overview]
Message-ID: <5284B089.1020209@linux.intel.com> (raw)
In-Reply-To: <s5hvbzv9u6g.wl%tiwai@suse.de>
On 11/14/2013 12:03 PM, Takashi Iwai wrote:
> At Thu, 14 Nov 2013 11:00:59 +0200,
> Jarkko Nikula wrote:
>> We have a few cases where we want to access struct device dev field in
>> struct acpi_device from generic code that is build also without CONFIG_ACPI.
>>
>> Provide here a minimal struct acpi_device stub that allows to build such a
>> code without adding new #ifdef CONFIG_ACPI churn. This should not increase
>> section sizes if code is protected by ACPI_COMPANION() runtime checks as
>> those will be optimized out by later compiler stages in case CONFIG_ACPI is
>> not set.
>>
>> Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
>> ---
>> Rafael, instead of this we could also have an accessor but adev->dev looked
>> better in actual code and size vmlinux didn't change for x86_64_defconfig
>> with CONFIG_ACPI is not set nor for omap2plus_defconfig.
> This looks too hackish, IMO. Defining a different dummy struct often
> gives more headaches. Thinking of the potential risk by misuses, it'd
> be simpler and safer to define a macro like acpi_dev_name() instead.
>
> BTW, is linux/device.h already included in !CONFIG_ACPI case?
>
It is included unconditionally in include/linux/acpi.h.
Your acpi_dev_name() proposal may be good enough for now as adev->dev
access in generic code (now under CONFIG_ACPI) seems to be anyway around
dev_name, using only pointer to struct acpi_device or has more things
that prevents immediate #ifdef CONFIG_ACPI removal there.
But one problem at time. I'll cook a version with acpi_dev_name.
--
Jarkko
next prev parent reply other threads:[~2013-11-14 11:14 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-25 12:18 [RFC 0/2] I2C and SPI dev_name change for ACPI enumerated slaves Jarkko Nikula
[not found] ` <1382703540-3769-1-git-send-email-jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-10-25 12:18 ` [RFC 1/2] i2c: Use stable dev_name for ACPI enumerated I2C slaves Jarkko Nikula
2013-10-25 12:52 ` Rafael J. Wysocki
[not found] ` <6032482.JJ4PNSSnIp-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org>
2013-10-25 12:55 ` Jarkko Nikula
[not found] ` <526A6A41.6020909-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-10-25 13:18 ` Rafael J. Wysocki
2013-10-25 13:30 ` Jarkko Nikula
[not found] ` <526A726F.1030407-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-10-25 14:08 ` Rafael J. Wysocki
[not found] ` <2889412.bEKBLJtgSW-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org>
2013-10-28 13:15 ` Jarkko Nikula
2013-10-28 16:10 ` Mark Brown
[not found] ` <526E636D.3070005-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-11-01 0:08 ` Rafael J. Wysocki
[not found] ` <1433914.mn8USodCgb-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org>
2013-11-01 0:26 ` Rafael J. Wysocki
2013-10-25 12:19 ` [RFC 2/2] spi: Use stable dev_name for ACPI enumerated SPI slaves Jarkko Nikula
2013-10-25 12:59 ` Mark Brown
2013-10-25 14:09 ` Rafael J. Wysocki
2013-11-01 12:35 ` [PATCHv2 0/3] I2C and SPI dev_name change for ACPI enumerated slaves Jarkko Nikula
2013-11-01 12:35 ` [PATCHv2 2/3] i2c: Use stable dev_name for ACPI enumerated I2C slaves Jarkko Nikula
[not found] ` <1383309356-25430-3-git-send-email-jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-11-02 0:15 ` Wolfram Sang
[not found] ` <1383309356-25430-1-git-send-email-jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-11-01 12:35 ` [PATCHv2 1/3] ACPI: Expose struct acpi_device and acpi_bus_get_device() to non-ACPI builds Jarkko Nikula
2013-11-02 22:18 ` Rafael J. Wysocki
[not found] ` <3858838.4tAO673dDi-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org>
2013-11-04 1:00 ` Rafael J. Wysocki
2013-11-04 21:15 ` Jarkko Nikula
2013-11-07 13:34 ` Rafael J. Wysocki
2013-11-01 12:35 ` [PATCHv2 3/3] spi: Use stable dev_name for ACPI enumerated SPI slaves Jarkko Nikula
[not found] ` <1383309356-25430-4-git-send-email-jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-11-01 18:03 ` Mark Brown
2013-11-01 13:18 ` [PATCHv2 0/3] I2C and SPI dev_name change for ACPI enumerated slaves Rafael J. Wysocki
[not found] ` <1601125.4tFOPicoTX-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org>
2013-11-01 13:20 ` Wolfram Sang
2013-11-01 13:44 ` Jarkko Nikula
2013-11-01 22:58 ` Rafael J. Wysocki
[not found] ` <3989164.GAoLSa6qzM-sKB8Sp2ER+y1GS7QM15AGw@public.gmane.org>
2013-11-02 0:13 ` Wolfram Sang
2013-11-14 9:00 ` [PATCHv3 " Jarkko Nikula
[not found] ` <1384419661-28293-1-git-send-email-jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-11-14 9:00 ` [PATCHv3 1/3] ACPI: Provide struct acpi_device stub for !CONFIG_ACPI builds Jarkko Nikula
2013-11-14 10:03 ` [alsa-devel] " Takashi Iwai
2013-11-14 11:14 ` Jarkko Nikula [this message]
2013-11-14 9:01 ` [PATCHv3 2/3] i2c: Use stable dev_name for ACPI enumerated I2C slaves Jarkko Nikula
2013-11-14 9:01 ` [PATCHv3 3/3] spi: Use stable dev_name for ACPI enumerated SPI slaves Jarkko Nikula
[not found] ` <1384419661-28293-4-git-send-email-jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-11-14 10:10 ` Mark Brown
2013-11-14 12:03 ` [PATCHv4 0/3] I2C and SPI dev_name change for ACPI enumerated slaves Jarkko Nikula
[not found] ` <1384430633-23426-1-git-send-email-jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-11-14 12:03 ` [PATCHv4 1/3] ACPI: Provide acpi_dev_name accessor for struct acpi_device device name Jarkko Nikula
2013-11-14 12:03 ` [PATCHv4 2/3] i2c: Use stable dev_name for ACPI enumerated I2C slaves Jarkko Nikula
[not found] ` <1384430633-23426-3-git-send-email-jarkko.nikula-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2013-11-14 17:22 ` Wolfram Sang
2013-11-14 12:03 ` [PATCHv4 3/3] spi: Use stable dev_name for ACPI enumerated SPI slaves Jarkko Nikula
2013-11-16 1:30 ` [PATCHv4 0/3] I2C and SPI dev_name change for ACPI enumerated slaves Rafael J. Wysocki
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