[PATCH] drm: exynos: mark pm functions as __maybe_unused

[Arnd Bergmann]

The rework of the exynos DRM clock handling introduced
warnings for configurations that have CONFIG_PM disabled:

drivers/gpu/drm/exynos/exynos_hdmi.c:736:13: error: 'hdmi_clk_disable_gates' defined but not used [-Werror=unused-function]
static void hdmi_clk_disable_gates(struct hdmi_context *hdata)
^~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/exynos/exynos_hdmi.c:717:12: error: 'hdmi_clk_enable_gates' defined but not used [-Werror=unused-function]
static int hdmi_clk_enable_gates(struct hdmi_context *hdata)

The problem is that the PM functions themselves are inside of
an #ifdef, but some functions they call are not.

This patch removes the #ifdef and instead marks the PM functions
as __maybe_unused, which is a more reliable way to get it right.

Link: https://patchwork.kernel.org/patch/8436281/
Fixes: 9be7e9898444 ("drm/exynos/hdmi: clock code re-factoring")
Signed-off-by: Arnd Bergmann <***@arndb.de>
---
Sent originally in Feb 2016 without reply. Found the patch
again in my backlog now, it's still needed.
---
drivers/gpu/drm/exynos/exynos_hdmi.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 06bfbe400cf1..02a00f1c6d5b 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -1934,8 +1934,7 @@ static int hdmi_remove(struct platform_device *pdev)
return 0;
}

-#ifdef CONFIG_PM
-static int exynos_hdmi_suspend(struct device *dev)
+static int __maybe_unused exynos_hdmi_suspend(struct device *dev)
{
struct hdmi_context *hdata = dev_get_drvdata(dev);

@@ -1944,7 +1943,7 @@ static int exynos_hdmi_suspend(struct device *dev)
return 0;
}

-static int exynos_hdmi_resume(struct device *dev)
+static int __maybe_unused exynos_hdmi_resume(struct device *dev)
{
struct hdmi_context *hdata = dev_get_drvdata(dev);
int ret;
@@ -1955,7 +1954,6 @@ static int exynos_hdmi_resume(struct device *dev)

return 0;
}
-#endif

static const struct dev_pm_ops exynos_hdmi_pm_ops = {
SET_RUNTIME_PM_OPS(exynos_hdmi_suspend, exynos_hdmi_resume, NULL)