linux-kernel - [PATCH] drm/mediatek: mark symbols static where possible

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Message-Id: <1474207335-21966-1-git-send-email-baoyou.xie@linaro.org>
Date:   Sun, 18 Sep 2016 22:02:15 +0800
From:   Baoyou Xie <baoyou.xie@...aro.org>
To:     ck.hu@...iatek.com, p.zabel@...gutronix.de, airlied@...ux.ie,
        matthias.bgg@...il.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        arnd@...db.de, baoyou.xie@...aro.org, xie.baoyou@....com.cn
Subject: [PATCH] drm/mediatek: mark symbols static where possible

We get 4 warnings when building kernel with W=1:
drivers/gpu/drm/mediatek/mtk_hdmi.c:1089:6: warning: no previous prototype for 'mtk_hdmi_audio_enable' [-Wmissing-prototypes]
drivers/gpu/drm/mediatek/mtk_hdmi.c:1095:6: warning: no previous prototype for 'mtk_hdmi_audio_disable' [-Wmissing-prototypes]
drivers/gpu/drm/mediatek/mtk_hdmi.c:1101:5: warning: no previous prototype for 'mtk_hdmi_audio_set_param' [-Wmissing-prototypes]
drivers/gpu/drm/mediatek/mtk_hdmi.c:1627:5: warning: no previous prototype for 'mtk_hdmi_audio_digital_mute' [-Wmissing-prototypes]

In fact, both functions are only used in the file in which they are
declared and don't need a declaration, but can be made static.
So this patch marks both functions with 'static'.

Signed-off-by: Baoyou Xie <baoyou.xie@...aro.org>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 334562d..be4e19c 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1086,19 +1086,19 @@ static int mtk_hdmi_output_init(struct mtk_hdmi *hdmi)
 	return 0;
 }
 
-void mtk_hdmi_audio_enable(struct mtk_hdmi *hdmi)
+static void mtk_hdmi_audio_enable(struct mtk_hdmi *hdmi)
 {
 	mtk_hdmi_aud_enable_packet(hdmi, true);
 	hdmi->audio_enable = true;
 }
 
-void mtk_hdmi_audio_disable(struct mtk_hdmi *hdmi)
+static void mtk_hdmi_audio_disable(struct mtk_hdmi *hdmi)
 {
 	mtk_hdmi_aud_enable_packet(hdmi, false);
 	hdmi->audio_enable = false;
 }
 
-int mtk_hdmi_audio_set_param(struct mtk_hdmi *hdmi,
+static int mtk_hdmi_audio_set_param(struct mtk_hdmi *hdmi,
 			     struct hdmi_audio_param *param)
 {
 	if (!hdmi->audio_enable) {
@@ -1624,7 +1624,8 @@ static void mtk_hdmi_audio_shutdown(struct device *dev, void *data)
 	mtk_hdmi_audio_disable(hdmi);
 }
 
-int mtk_hdmi_audio_digital_mute(struct device *dev, void *data, bool enable)
+static int
+mtk_hdmi_audio_digital_mute(struct device *dev, void *data, bool enable)
 {
 	struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
 
-- 
2.7.4