linux-kernel - [PATCH v2] drm/pl111: fix warnings without CONFIG_ARM

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Date:   Wed, 24 May 2017 17:49:58 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm/pl111: fix warnings without CONFIG_ARM_AMBA

The driver is written in a way to enable compile-testing without CONFIG_ARM_AMBA,
but it just causes needless warnings:

drivers/gpu/drm/pl111/pl111_drv.c:149:26: error: 'pl111_drm_driver' defined but not used [-Werror=unused-variable]
drivers/gpu/drm/pl111/pl111_drv.c:81:12: error: 'pl111_modeset_init' defined but not used [-Werror=unused-function]

This unhides the probe/remove functions again and just leaves the driver
object as unused when CONFIG_ARM_AMBA is disabled, with a __maybe_unused
annotation to shut up the warning.

Fixes: bed41005e617 ("drm/pl111: Initial drm/kms driver for pl111")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/pl111/pl111_drv.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
index 97095b1aa961..daa22849aeed 100644
--- a/drivers/gpu/drm/pl111/pl111_drv.c
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -179,7 +179,6 @@ static struct drm_driver pl111_drm_driver = {
 #endif
 };
 
-#ifdef CONFIG_ARM_AMBA
 static int pl111_amba_probe(struct amba_device *amba_dev,
 			    const struct amba_id *id)
 {
@@ -252,7 +251,7 @@ static struct amba_id pl111_id_table[] = {
 	{0, 0},
 };
 
-static struct amba_driver pl111_amba_driver = {
+static struct amba_driver pl111_amba_driver __maybe_unused = {
 	.drv = {
 		.name = "drm-clcd-pl111",
 	},
@@ -261,8 +260,9 @@ static struct amba_driver pl111_amba_driver = {
 	.id_table = pl111_id_table,
 };
 
+#ifdef CONFIG_ARM_AMBA
 module_amba_driver(pl111_amba_driver);
-#endif /* CONFIG_ARM_AMBA */
+#endif
 
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_AUTHOR("ARM Ltd.");
-- 
2.9.0