linux-kernel - [PATCH] [media] rockchip/rga: annotate PM functions as __maybe

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Date:   Thu, 19 Oct 2017 11:30:34 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jacob chen <jacob2.chen@...k-chips.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     Arnd Bergmann <arnd@...db.de>, Hans Verkuil <hansverk@...co.com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [media] rockchip/rga: annotate PM functions as __maybe_unused

The newly added driver has incorrect #ifdef annotations on its
PM functions, leading to a harmless compile-time warning when
CONFIG_PM is disabled:

drivers/media/platform/rockchip/rga/rga.c:760:13: error: 'rga_disable_clocks' defined but not used [-Werror=unused-function]
 static void rga_disable_clocks(struct rockchip_rga *rga)
             ^~~~~~~~~~~~~~~~~~
drivers/media/platform/rockchip/rga/rga.c:728:12: error: 'rga_enable_clocks' defined but not used [-Werror=unused-function]

This removes the #ifdef and marks the functions as __maybe_unused,
so gcc can silently drop all the unused code.

Fixes: f7e7b48e6d79 ("[media] rockchip/rga: v4l2 m2m support")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/media/platform/rockchip/rga/rga.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/rockchip/rga/rga.c b/drivers/media/platform/rockchip/rga/rga.c
index e7d1b34baf1c..89296de9cf4a 100644
--- a/drivers/media/platform/rockchip/rga/rga.c
+++ b/drivers/media/platform/rockchip/rga/rga.c
@@ -960,8 +960,7 @@ static int rga_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int rga_runtime_suspend(struct device *dev)
+static int __maybe_unused rga_runtime_suspend(struct device *dev)
 {
 	struct rockchip_rga *rga = dev_get_drvdata(dev);
 
@@ -970,13 +969,12 @@ static int rga_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int rga_runtime_resume(struct device *dev)
+static int __maybe_unused rga_runtime_resume(struct device *dev)
 {
 	struct rockchip_rga *rga = dev_get_drvdata(dev);
 
 	return rga_enable_clocks(rga);
 }
-#endif
 
 static const struct dev_pm_ops rga_pm = {
 	SET_RUNTIME_PM_OPS(rga_runtime_suspend,
-- 
2.9.0