linux-kernel - [PATCH 6/7] Fix a warning pertaining to the aty128fb backlight variable

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Date:	Fri, 03 Jan 2014 16:08:04 +0000
From:	David Howells <dhowells@...hat.com>
To:	akpm@...ux-foundation.org
Cc:	dhowells@...hat.com, linux-fbdev@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 6/7] Fix a warning pertaining to the aty128fb backlight
 variable

Fix the following warning in the aty128fb driver:

	drivers/video/aty/aty128fb.c:363:12: warning: 'backlight' defined but not used [-Wunused-variable]
	 static int backlight = 0;
		    ^

as the variable's value is only read if CONFIG_FB_ATY128_BACKLIGHT=y.  The
variable is also set if MODULE is unset[*].

[*] I wonder if the conditional wrapper around aty128fb_setup() should be
    using CONFIG_MODULE rather than MODULE.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Paul Mackerras <paulus@...ba.org>
cc: linux-fbdev@...r.kernel.org
---

 drivers/video/aty/aty128fb.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/video/aty/aty128fb.c b/drivers/video/aty/aty128fb.c
index 12ca031877d4..52108be69e77 100644
--- a/drivers/video/aty/aty128fb.c
+++ b/drivers/video/aty/aty128fb.c
@@ -357,11 +357,13 @@ static int default_lcd_on = 1;
 static bool mtrr = true;
 #endif
 
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
 #ifdef CONFIG_PMAC_BACKLIGHT
 static int backlight = 1;
 #else
 static int backlight = 0;
 #endif
+#endif
 
 /* PLL constants */
 struct aty128_constants {
@@ -1671,7 +1673,9 @@ static int aty128fb_setup(char *options)
 			default_crt_on = simple_strtoul(this_opt+4, NULL, 0);
 			continue;
 		} else if (!strncmp(this_opt, "backlight:", 10)) {
+#ifdef CONFIG_FB_ATY128_BACKLIGHT
 			backlight = simple_strtoul(this_opt+10, NULL, 0);
+#endif
 			continue;
 		}
 #ifdef CONFIG_MTRR

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