linux-kernel - Re: [PATCH] ASoC: SOF: Fix build error with CONFIG_SND_SOC_SOF

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Message-ID: <07c6a947-aa4f-2195-d4bf-3a757528352e@huawei.com>
Date:   Fri, 10 May 2019 21:09:59 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Takashi Iwai <tiwai@...e.de>
CC:     <lgirdwood@...il.com>, <rdunlap@...radead.org>,
        <broonie@...nel.org>, <pierre-louis.bossart@...ux.intel.com>,
        <perex@...ex.cz>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: SOF: Fix build error with
 CONFIG_SND_SOC_SOF_NOCODEC=m

On 2019/5/10 15:12, Takashi Iwai wrote:
> On Fri, 10 May 2019 04:36:57 +0200,
> YueHaibing wrote:
>>
>> Fix gcc build error while CONFIG_SND_SOC_SOF_NOCODEC=m
>>
>> sound/soc/sof/core.o: In function `snd_sof_device_probe':
>> core.c:(.text+0x4af): undefined reference to `sof_nocodec_setup'
>>
>> Change SND_SOC_SOF_NOCODEC to bool to fix this.
>>
>> Reported-by: Hulk Robot <hulkci@...wei.com>
>> Fixes: c16211d6226d ("ASoC: SOF: Add Sound Open Firmware driver core")
>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> 
> This change would break things severely.  This won't allow to build it
> as a module any longer.
> 
> A better fix would be to somehow restrict the SND_SOC_SOF_NOCODEC to
> align with SND_SOC_SOF, i.e. disallow SND_SOC_SOF=y &&
> SND_SOC_SOF_NOCODEC=m.  Because of the complex mix of select and
> depends-on in SOF, I'm afraid that it's not that trivial, though.
> There might be something I overlooked, hopefully...
> 
> An easier alternative would be to replace
> IS_ENABLED(CONFIG_SND_SOC_SOF_NOCODEC) with
> IS_REACHABLE(CONFIG_SND_SOC_SOF_NOCODEC).  This assures the condition
> at the build time, although the error at probe might be a surprising
> to some users that don't know this hidden dependency.
> 

Yes, I prefer to use IS_REACHABLE, thanks!

> 
> thanks,
> 
> Takashi
> 
> 
>> ---
>>  sound/soc/sof/Kconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/sound/soc/sof/Kconfig b/sound/soc/sof/Kconfig
>> index b204c65..9c280c9 100644
>> --- a/sound/soc/sof/Kconfig
>> +++ b/sound/soc/sof/Kconfig
>> @@ -44,7 +44,7 @@ config SND_SOC_SOF_OPTIONS
>>  if SND_SOC_SOF_OPTIONS
>>  
>>  config SND_SOC_SOF_NOCODEC
>> -	tristate "SOF nocodec mode Support"
>> +	bool "SOF nocodec mode Support"
>>  	help
>>  	  This adds support for a dummy/nocodec machine driver fallback
>>  	  option if no known codec is detected. This is typically only
>> -- 
>> 2.7.4
>>
>>
>>
> 
> .
>