From: Arnd Bergmann arnd@arndb.de
[ Upstream commit e837b59f8b411b5baf5e3de7a5aea10b1c545a63 ]
It is currently possible to configure a kernel with all Intel SoC configs as loadable modules, but the board config as built-in. This causes a link failure in the reference to the snd_soc_sof.ko module:
x86_64-linux-ld: sound/soc/intel/boards/sof_rt5682.o: in function `sof_rt5682_hw_params': sof_rt5682.c:(.text+0x1f9): undefined reference to `sof_dai_get_mclk' x86_64-linux-ld: sof_rt5682.c:(.text+0x234): undefined reference to `sof_dai_get_bclk' x86_64-linux-ld: sound/soc/intel/boards/sof_rt5682.o: in function `sof_rt5682_codec_init': sof_rt5682.c:(.text+0x3e0): undefined reference to `sof_dai_get_mclk' x86_64-linux-ld: sound/soc/intel/boards/sof_cs42l42.o: in function `sof_cs42l42_hw_params': sof_cs42l42.c:(.text+0x2a): undefined reference to `sof_dai_get_bclk' x86_64-linux-ld: sound/soc/intel/boards/sof_nau8825.o: in function `sof_nau8825_hw_params': sof_nau8825.c:(.text+0x7f): undefined reference to `sof_dai_get_bclk' x86_64-linux-ld: sound/soc/intel/boards/sof_da7219.o: in function `da7219_codec_init': sof_da7219.c:(.text+0xbf): undefined reference to `sof_dai_get_mclk' x86_64-linux-ld: sound/soc/intel/boards/sof_maxim_common.o: in function `max_98373_hw_params': sof_maxim_common.c:(.text+0x6f9): undefined reference to `sof_dai_get_tdm_slots' x86_64-linux-ld: sound/soc/intel/boards/sof_realtek_common.o: in function `rt1015_hw_params': sof_realtek_common.c:(.text+0x54c): undefined reference to `sof_dai_get_bclk' x86_64-linux-ld: sound/soc/intel/boards/sof_realtek_common.o: in function `rt1308_hw_params': sof_realtek_common.c:(.text+0x702): undefined reference to `sof_dai_get_mclk' x86_64-linux-ld: sound/soc/intel/boards/sof_cirrus_common.o: in function `cs35l41_hw_params': sof_cirrus_common.c:(.text+0x2f): undefined reference to `sof_dai_get_bclk'
Add an optional dependency on SND_SOC_SOF_INTEL_COMMON, to ensure that whenever the SOF support is in a loadable module, none of the board code can be built-in.
This may be be a little heavy-handed, but I also don't see a reason why one would want the boards to be built-in but not the SoC, so it shouldn't actually cause any usability problems.
Signed-off-by: Arnd Bergmann arnd@arndb.de Link: https://patch.msgid.link/20250709145626.64125-1-arnd@kernel.org Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org ---
LLM Generated explanations, may be completely bogus:
Based on my analysis of the commit and its context, here is my assessment:
**YES** - This commit should be backported to stable kernel trees.
## Extensive Explanation:
### 1. **The commit fixes a critical build failure** The commit addresses link errors that occur when Intel ASoC board drivers are built-in (=y) while the SOF core module is built as a loadable module (=m). The error messages show undefined references to SOF DAI functions: - `sof_dai_get_mclk` - `sof_dai_get_bclk` - `sof_dai_get_tdm_slots`
These functions are exported from the `snd-sof` module (defined in `sound/soc/sof/sof-audio.c`), but when board drivers are built-in, they cannot reference symbols from loadable modules.
### 2. **The fix is minimal and contained** The change is a single-line modification to the Kconfig dependency: ```diff -if SND_SOC_INTEL_MACH +if SND_SOC_INTEL_MACH && (SND_SOC_SOF_INTEL_COMMON || !SND_SOC_SOF_INTEL_COMMON) ```
This clever dependency ensures that when `SND_SOC_SOF_INTEL_COMMON` is built as a module (=m), the Intel machine drivers cannot be built-in (=y). The `|| !SND_SOC_SOF_INTEL_COMMON` part allows the machine drivers to be enabled when SOF support is completely disabled.
### 3. **Similar to previous backported fixes** Looking at the historical commits: - Commit `8d0872f6239f` (Similar Commit #1) fixed a similar link failure for `sof-nau8825` and was backported (YES) - Commit `f4df4e4042b0` (Similar Commit #4) fixed a similar dependency issue with SOF IMX and was backported (YES)
Both of these commits addressed build/link failures caused by incorrect Kconfig dependencies, just like this commit.
### 4. **No risk of regression** The change only affects build configuration and doesn't modify any runtime code. It prevents invalid configurations that would fail to build anyway. As the commit message states: "it shouldn't actually cause any usability problems" because there's no practical reason to have board drivers built-in while the SOF core is a module.
### 5. **Meets stable tree criteria** - Fixes a real bug (build failure) - Small and contained change - No new features or architectural changes - Similar fixes have been backported before - Low risk of introducing new issues
The commit follows the pattern of other Kconfig dependency fixes in the Intel ASoC subsystem that have been successfully backported to stable trees.
sound/soc/intel/boards/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/intel/boards/Kconfig b/sound/soc/intel/boards/Kconfig index 61b71d6c44cfa..960a1bd79489b 100644 --- a/sound/soc/intel/boards/Kconfig +++ b/sound/soc/intel/boards/Kconfig @@ -11,7 +11,7 @@ menuconfig SND_SOC_INTEL_MACH kernel: saying N will just cause the configurator to skip all the questions about Intel ASoC machine drivers.
-if SND_SOC_INTEL_MACH +if SND_SOC_INTEL_MACH && (SND_SOC_SOF_INTEL_COMMON || !SND_SOC_SOF_INTEL_COMMON)
config SND_SOC_INTEL_USER_FRIENDLY_LONG_NAMES bool "Use more user friendly long card names"