linux-kernel - [PATCH v2] drm/msm/gpu: Avoid -Wunused-function with !CONFIG_PM

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Date:   Mon, 11 Apr 2022 11:12:50 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>
Cc:     Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH v2] drm/msm/gpu: Avoid -Wunused-function with !CONFIG_PM_SLEEP

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.

To resolve this, use the SYSTEM_SLEEP_PM_OPS() and RUNTIME_PM_OPS()
macros, which were introduced in commit 1a3c7bb08826 ("PM: core: Add new
*_PM_OPS macros, deprecate old ones"). They are designed to avoid these
compiler warnings while still guarding their use on
CONFIG_PM{,_SLEEP}=y.

Fixes: 7e4167c9e021 ("drm/msm/gpu: Park scheduler threads for system suspend")
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---

v1 -> v2: https://lore.kernel.org/20220330180541.62250-1-nathan@kernel.org/

* Avoid using #ifdef altogether by using new PM macros.

 drivers/gpu/drm/msm/adreno/adreno_device.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
index 661dfa7681fb..8706bcdd1472 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -599,7 +599,6 @@ static const struct of_device_id dt_match[] = {
 	{}
 };
 
-#ifdef CONFIG_PM
 static int adreno_runtime_resume(struct device *dev)
 {
 	struct msm_gpu *gpu = dev_to_gpu(dev);
@@ -682,11 +681,9 @@ static int adreno_system_resume(struct device *dev)
 	return pm_runtime_force_resume(dev);
 }
 
-#endif
-
 static const struct dev_pm_ops adreno_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(adreno_system_suspend, adreno_system_resume)
-	SET_RUNTIME_PM_OPS(adreno_runtime_suspend, adreno_runtime_resume, NULL)
+	SYSTEM_SLEEP_PM_OPS(adreno_system_suspend, adreno_system_resume)
+	RUNTIME_PM_OPS(adreno_runtime_suspend, adreno_runtime_resume, NULL)
 };
 
 static struct platform_driver adreno_driver = {

base-commit: 0fe35b8dcb8b3c4b751a1a44f1e128b690af71e4
-- 
2.35.1