On 30/03/2022 21:05, Nathan Chancellor wrote:
When building with CONFIG_PM=y and CONFIG_PM_SLEEP=n (such as ARCH=riscv allmodconfig), the following warnings/errors occur:
drivers/gpu/drm/msm/adreno/adreno_device.c:679:12: error: 'adreno_system_resume' defined but not used [-Werror=unused-function] 679 | static int adreno_system_resume(struct device *dev) | ^~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/msm/adreno/adreno_device.c:655:12: error: 'adreno_system_suspend' defined but not used [-Werror=unused-function] 655 | static int adreno_system_suspend(struct device *dev) | ^~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors
These functions are only used in SET_SYSTEM_SLEEP_PM_OPS(), which evaluates to empty when CONFIG_PM_SLEEP is not set, making these functions unused.
Traditionally, these functions are marked as __maybe_unused but in this case, there is already an '#ifdef CONFIG_PM' in the code, so just do the same thing with CONFIG_PM_SLEEP to resolve the warning.
Fixes: 7e4167c9e021 ("drm/msm/gpu: Park scheduler threads for system suspend") Signed-off-by: Nathan Chancellor nathan@kernel.org
I'd suggest using __maybe_unused instead (and maybe even sending the followup patch changing the #ifdef CONFIG_PM to __maybe_unused too):
If the code is included into the compilation, it means it's more widely compile tested. Which tends to reveal obscure bugs, dependencies, etc.
drivers/gpu/drm/msm/adreno/adreno_device.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c index 661dfa7681fb..b25915230bab 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_device.c +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c @@ -621,6 +621,7 @@ static int adreno_runtime_suspend(struct device *dev) return gpu->funcs->pm_suspend(gpu); }
+#ifdef CONFIG_PM_SLEEP static void suspend_scheduler(struct msm_gpu *gpu) { int i; @@ -681,8 +682,8 @@ static int adreno_system_resume(struct device *dev) resume_scheduler(dev_to_gpu(dev)); return pm_runtime_force_resume(dev); }
-#endif +#endif /* CONFIG_PM_SLEEP */ +#endif /* CONFIG_PM */
static const struct dev_pm_ops adreno_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(adreno_system_suspend, adreno_system_resume)
base-commit: 05241de1f69eb7f56b0a5e0bec96a7752fad1b2f