linux-kernel - Re: [alsa-devel] [PATCH v4 08/15] soundwire: add initial definitions for sdw_master

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Date:   Mon, 16 Dec 2019 09:02:01 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        linux-kernel@...r.kernel.org,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        vkoul@...nel.org, broonie@...nel.org,
        srinivas.kandagatla@...aro.org, jank@...ence.com,
        slawomir.blauciak@...el.com, Sanyog Kale <sanyog.r.kale@...el.com>,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>
Subject: Re: [alsa-devel] [PATCH v4 08/15] soundwire: add initial definitions
 for sdw_master_device



On 12/14/19 2:27 AM, Greg KH wrote:
> On Fri, Dec 13, 2019 at 05:25:23PM -0600, Pierre-Louis Bossart wrote:
>>
>>> No, I mean the new MODULE_NAMESPACE() support that is in the kernel.
>>> I'll move the greybus code to use it too, but when you are adding new
>>> apis, it just makes sense to use it then as well.
>>
>> Greg, would the patch below be what you had in mind?
>> Thanks
>> -Pierre
>>
>>
>> diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile
>> index 76a5c52b12b4..5bad8422887e 100644
>> --- a/drivers/soundwire/Makefile
>> +++ b/drivers/soundwire/Makefile
>> @@ -7,9 +7,11 @@ ccflags-y += -DDEBUG
>>   #Bus Objs
>>   soundwire-bus-objs := bus_type.o bus.o master.o slave.o mipi_disco.o
>> stream.o
>>   obj-$(CONFIG_SOUNDWIRE) += soundwire-bus.o
>> +ccflags-$(CONFIG_SOUNDWIRE) += -DDEFAULT_SYMBOL_NAMESPACE=SDW_CORE
>>
>>   soundwire-generic-allocation-objs := generic_bandwidth_allocation.o
>>   obj-$(CONFIG_SOUNDWIRE_GENERIC_ALLOCATION) +=
>> soundwire-generic-allocation.o
>> +ccflags-$(CONFIG_SOUNDWIRE_GENERIC_ALLOCATION) +=
>> -DDEFAULT_SYMBOL_NAMESPACE=SDW_CORE
> 
> Don't use ccflags, just use the correct MODULE_EXPORT_NS() tag instead.

The documentation [1] states

"
Defining namespaces for all symbols of a subsystem can be very verbose 
and may become hard to maintain. Therefore a default define 
(DEFAULT_SYMBOL_NAMESPACE) is been provided, that, if set, will become 
the default for all EXPORT_SYMBOL() and EXPORT_SYMBOL_GPL() macro 
expansions that do not specify a namespace.
"

If the ccflags option is not supported or no longer desired, it'd be 
worth updating the documentation for dummies like me. I took the wording 
as a hint to avoid using MODULE_EXPORT_NS.

> And "SDW_CORE" is odd, "SOUNDWIRE" instead?

'sdw' is the prefix used everywhere for SoundWire symbols.

[1] https://www.kernel.org/doc/html/latest/core-api/symbol-namespaces.html