linux-kernel - Re: drivers/soundwire/qcom.c:767: undefined reference to `slimbus

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Message-ID: <20201125055155.GD8403@vkoul-mobl>
Date:   Wed, 25 Nov 2020 11:21:55 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     kernel test robot <lkp@...el.com>,
        Jonathan Marek <jonathan@...ek.ca>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        moderated for non-subscribers <alsa-devel@...a-project.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Subject: Re: drivers/soundwire/qcom.c:767: undefined reference to
 `slimbus_bus'

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@...nel.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@...el.com>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
---
 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) {
-- 
2.26.2

-- 
~Vinod