Re: drivers/soundwire/qcom.c:767: undefined reference to `slimbus_bus'

From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To: Vinod Koul <vkoul@kernel.org>, Randy Dunlap <rdunlap@infradead.org>
Cc: kernel test robot <lkp@intel.com>,
	Jonathan Marek <jonathan@marek.ca>,
	kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Bard Liao <yung-chuan.liao@linux.intel.com>,
	moderated for non-subscribers <alsa-devel@alsa-project.org>,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Subject: Re: drivers/soundwire/qcom.c:767: undefined reference to `slimbus_bus'
Date: Wed, 25 Nov 2020 11:41:29 +0000	[thread overview]
Message-ID: <c0d24710-b2c6-aff0-c28a-fe276dd7eb46@linaro.org> (raw)
In-Reply-To: <20201125055155.GD8403@vkoul-mobl>

On 25/11/2020 05:51, Vinod Koul wrote:
> Hi Randy,
> 
> On 04-11-20, 19:32, Randy Dunlap wrote:
>> On 11/2/20 11:47 AM, kernel test robot wrote:
>>> All errors (new ones prefixed by >>):
>>>
>>>     or1k-linux-ld: drivers/soundwire/qcom.o: in function `qcom_swrm_probe':
>>>>> drivers/soundwire/qcom.c:767: undefined reference to `slimbus_bus'
>>>>> or1k-linux-ld: drivers/soundwire/qcom.c:771: undefined reference to `slimbus_bus'
>>>
>>> 09309093d5e8f87 Jonathan Marek       2020-09-08  770  #if IS_ENABLED(CONFIG_SLIMBUS)
>>> 02efb49aa805cee Srinivas Kandagatla  2020-01-13 @771  	if (dev->parent->bus == &slimbus_bus) {
>>> 5bd773242f75da3 Jonathan Marek       2020-09-05  772  #else
>>> 5bd773242f75da3 Jonathan Marek       2020-09-05  773  	if (false) {
>>> 5bd773242f75da3 Jonathan Marek       2020-09-05  774  #endif
>>
>> config SOUNDWIRE_QCOM
>> 	tristate "Qualcomm SoundWire Master driver"
>> 	imply SLIMBUS
>> 	depends on SND_SOC
>>
>> The kernel config that was attached has:
>> CONFIG_SOUNDWIRE_QCOM=y
>> CONFIG_SLIMBUS=m
>>
>> I expected that "imply" would make SLIMBUS=y since SOUNDWIRE_QCOM=y,
>> but I guess that's not the case. :(
>>
>> Any ideas about what to do here?
> 
> Sorry to have missed this earlier. I did some digging and found the
> Kconfig code to be correct, but not the driver code. Per the
> Documentation if we are using imply we should use IS_REACHABLE() rather
> than IS_ENABLED.
> 
> This seems to take care of build failure for me on arm64 and x64 builds.
> 
> Can you confirm with below patch:
> 
> ---><8---
> 
> From: Vinod Koul <vkoul@kernel.org>
> Date: Wed, 25 Nov 2020 11:15:22 +0530
> Subject: [PATCH] soundwire: qcom: Fix build failure when slimbus is module
> 
> Commit 5bd773242f75 ("soundwire: qcom: avoid dependency on
> CONFIG_SLIMBUS") removed hard dependency on Slimbus for qcom driver but
> it results in build failure when:
> CONFIG_SOUNDWIRE_QCOM=y
> CONFIG_SLIMBUS=m
> 
> drivers/soundwire/qcom.o: In function `qcom_swrm_probe':
> qcom.c:(.text+0xf44): undefined reference to `slimbus_bus'
> 
> Fix this by using IS_REACHABLE() in driver which is recommended to be
> sued with imply.
> 
> Fixes: 5bd773242f75 ("soundwire: qcom: avoid dependency on CONFIG_SLIMBUS")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Vinod Koul <vkoul@kernel.org>
> ---

Thanks Vinod,

Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

--srini
>   drivers/soundwire/qcom.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
> index fbca4ebf63e9..6d22df01f354 100644
> --- a/drivers/soundwire/qcom.c
> +++ b/drivers/soundwire/qcom.c
> @@ -799,7 +799,7 @@ static int qcom_swrm_probe(struct platform_device *pdev)
>   	data = of_device_get_match_data(dev);
>   	ctrl->rows_index = sdw_find_row_index(data->default_rows);
>   	ctrl->cols_index = sdw_find_col_index(data->default_cols);
> -#if IS_ENABLED(CONFIG_SLIMBUS)
> +#if IS_REACHABLE(CONFIG_SLIMBUS)
>   	if (dev->parent->bus == &slimbus_bus) {
>   #else
>   	if (false) {
> 