linux-kernel - [PATCH v2] regulator: Kconfig: Fix REGULATOR_QCOM

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Message-Id: <20201123222359.103822-1-john.stultz@linaro.org>
Date:   Mon, 23 Nov 2020 22:23:59 +0000
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>, Todd Kjos <tkjos@...gle.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Maulik Shah <mkshah@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-arm-msm@...r.kernel.org
Subject: [PATCH v2] regulator: Kconfig: Fix REGULATOR_QCOM_RPMH dependencies to avoid build error

The kernel test robot reported the following build error:

All errors (new ones prefixed by >>):

   xtensa-linux-ld: drivers/regulator/qcom-rpmh-regulator.o: in function `rpmh_regulator_vrm_get_voltage_sel':
   qcom-rpmh-regulator.c:(.text+0x270): undefined reference to `rpmh_write'
   xtensa-linux-ld: drivers/regulator/qcom-rpmh-regulator.o: in function `rpmh_regulator_send_request':
   qcom-rpmh-regulator.c:(.text+0x2f2): undefined reference to `rpmh_write'
   xtensa-linux-ld: drivers/regulator/qcom-rpmh-regulator.o: in function `rpmh_regulator_vrm_get_voltage_sel':
>> qcom-rpmh-regulator.c:(.text+0x274): undefined reference to `rpmh_write_async'
   xtensa-linux-ld: drivers/regulator/qcom-rpmh-regulator.o: in function `rpmh_regulator_send_request':
   qcom-rpmh-regulator.c:(.text+0x2fc): undefined reference to `rpmh_write_async'

Which is due to REGULATOR_QCOM_RPMH depending on
QCOM_RPMH || COMPILE_TEST. The problem is that QOM_RPMH can now
be a module, which in that case requires REGULATOR_QCOM_RPMH=m
to build.

However, if COMPILE_TEST is enabled, REGULATOR_QCOM_RPMH can be
set to =y while QCOM_RPMH=m which will cause build failures.

The fix here is to add (QCOM_RPMH=n && COMPILE_TEST) to the
dependency.

Feedback would be appreciated!

Cc: Todd Kjos <tkjos@...gle.com>
Cc: Saravana Kannan <saravanak@...gle.com>
Cc: Andy Gross <agross@...nel.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Rajendra Nayak <rnayak@...eaurora.org>
Cc: Maulik Shah <mkshah@...eaurora.org>
Cc: Stephen Boyd <swboyd@...omium.org>
Cc: Liam Girdwood <lgirdwood@...il.com>
Cc: Mark Brown <broonie@...nel.org>
Cc: linux-arm-msm@...r.kernel.org
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
v2: Switch dependency logic as suggested by MarkB
---
 drivers/regulator/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 020a00d6696b..481c7b10133b 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -843,7 +843,7 @@ config REGULATOR_QCOM_RPM
 
 config REGULATOR_QCOM_RPMH
 	tristate "Qualcomm Technologies, Inc. RPMh regulator driver"
-	depends on QCOM_RPMH || COMPILE_TEST
+	depends on QCOM_RPMH || (QCOM_RPMH=n && COMPILE_TEST)
 	help
 	  This driver supports control of PMIC regulators via the RPMh hardware
 	  block found on Qualcomm Technologies Inc. SoCs.  RPMh regulator
-- 
2.17.1