linux-kernel - [PATCH 1/6] fbdev: fbmon: fix -Wextra build warnings

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Message-Id: <20200315041002.24473-2-rdunlap@infradead.org>
Date:   Sat, 14 Mar 2020 21:09:57 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        Antonino Daplas <adaplas@...il.com>,
        Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [PATCH 1/6] fbdev: fbmon: fix -Wextra build warnings

When 'DEBUG' is not defined, modify the DPRINTK() macro to use the
no_printk() macro instead of using <empty>.
This fixes a build warning when -Wextra is used and provides
printk format checking:

../drivers/video/fbdev/core/fbmon.c:812:47: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
../drivers/video/fbdev/core/fbmon.c:842:24: warning: suggest braces around empty body in an ‘else’ statement [-Wempty-body]
../drivers/video/fbdev/core/fbmon.c:847:24: warning: suggest braces around empty body in an ‘else’ statement [-Wempty-body]

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-fbdev@...r.kernel.org
---
Alternative: use pr_debug() so that CONFIG_DYNAMIC_DEBUG can be used
at these sites.

 drivers/video/fbdev/core/fbmon.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-next-20200313.orig/drivers/video/fbdev/core/fbmon.c
+++ linux-next-20200313/drivers/video/fbdev/core/fbmon.c
@@ -44,7 +44,7 @@
 #ifdef DEBUG
 #define DPRINTK(fmt, args...) printk(fmt,## args)
 #else
-#define DPRINTK(fmt, args...)
+#define DPRINTK(fmt, args...) no_printk(fmt, ##args)
 #endif
 
 #define FBMON_FIX_HEADER  1