[PATCH v2] firmware: meson: sm: add stub functions when CONFIG_MESON_SM is disabled

[Ronald Claveau via B4 Relay]

From: Ronald Claveau <linux-kernel-dev at aliel.fr>

After merging the thermal tree, linux-next build (arm_multi_v7
defconfig) failed like this:

arm-linux-gnueabihf-ld: drivers/thermal/amlogic_thermal.o: in function `amlogic_thermal_probe_sm':
/tmp/next/build/drivers/thermal/amlogic_thermal.c:196:(.text+0x2f4): undefined reference to `meson_sm_get'
arm-linux-gnueabihf-ld: /tmp/next/build/drivers/thermal/amlogic_thermal.c:205:(.text+0x320): undefined reference to `meson_sm_get_thermal_calib'

Add inline stub implementations of meson_sm_get() and
meson_sm_get_thermal_calib() behind an #else guard so that drivers
including this header can be compiled without CONFIG_MESON_SM .

Fixes: b21d88de6918 ("thermal/drivers/amlogic: Add support for secure monitor calibration readout")
Closes: https://lore.kernel.org/oe-kbuild-all/202605291530.en7aGn7w-lkp@intel.com/
Reported-by: Mark Brown <broonie at kernel.org>
Reported-by: kernel test robot <lkp at intel.com>
Signed-off-by: Ronald Claveau <linux-kernel-dev at aliel.fr>
---
Changes in v2:
- Replace #ifdef CONFIG_MESON_SM by #if IS_ENABLED(CONFIG_MESON_SM)
  to cover builtin and module in config.
- Add missing trailers for kernel test robot.
- Link to v1: https://lore.kernel.org/r/20260530-fix-missing-meson_sm-symbol-v1-1-3fb672b989d4@aliel.fr
---
 include/linux/firmware/meson/meson_sm.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/firmware/meson/meson_sm.h b/include/linux/firmware/meson/meson_sm.h
index 3ebc2bd9a9760..baecdaf263f41 100644
--- a/include/linux/firmware/meson/meson_sm.h
+++ b/include/linux/firmware/meson/meson_sm.h
@@ -27,8 +27,25 @@ int meson_sm_call_write(struct meson_sm_firmware *fw, void *buffer,
 int meson_sm_call_read(struct meson_sm_firmware *fw, void *buffer,
 		       unsigned int bsize, unsigned int cmd_index, u32 arg0,
 		       u32 arg1, u32 arg2, u32 arg3, u32 arg4);
+
+#if IS_ENABLED(CONFIG_MESON_SM)
+
 struct meson_sm_firmware *meson_sm_get(struct device_node *firmware_node);
 int meson_sm_get_thermal_calib(struct meson_sm_firmware *fw, u32 *trim_info,
 			       u32 tsensor_id);
 
+#else
+
+static inline struct meson_sm_firmware *meson_sm_get(struct device_node *firmware_node)
+{
+	return NULL;
+}
+static inline int meson_sm_get_thermal_calib(struct meson_sm_firmware *fw,
+					     u32 *trim_info, u32 tsensor_id)
+{
+	return -EINVAL;
+}
+
+#endif
+
 #endif /* _MESON_SM_FW_H_ */

---
base-commit: 3929405c64376a8a54c794e8a4485023b108a97e
change-id: 20260529-fix-missing-meson_sm-symbol-7776d0d9d760

Best regards,
-- 
Ronald Claveau <linux-kernel-dev at aliel.fr>