linux-kernel - [PATCH] parport: fix if-statement empty body warnings

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Message-ID: <e7868a5c-5356-bbbb-f416-799a7f75f7ad@infradead.org>
Date:   Thu, 27 Feb 2020 18:08:15 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        linux-parport@...ts.infradead.org
Cc:     Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
Subject: [PATCH] parport: fix if-statement empty body warnings

From: Randy Dunlap <rdunlap@...radead.org>

When debugging via DPRINTK() is not enabled, make the DPRINTK()
macro be an empty do-while block.

This fixes gcc warnings when -Wextra is set:

../drivers/parport/ieee1284.c:262:18: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
../drivers/parport/ieee1284.c:285:17: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
../drivers/parport/ieee1284.c:298:17: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
../drivers/parport/ieee1284_ops.c:576:18: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]

I have verified that there is no object code change (with gcc 7.5.0).

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
Cc: linux-parport@...ts.infradead.org
---
 drivers/parport/ieee1284.c     |    2 +-
 drivers/parport/ieee1284_ops.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- linux-next-20200225.orig/drivers/parport/ieee1284.c
+++ linux-next-20200225/drivers/parport/ieee1284.c
@@ -34,7 +34,7 @@
 #ifdef DEBUG
 #define DPRINTK(stuff...) printk (stuff)
 #else
-#define DPRINTK(stuff...)
+#define DPRINTK(stuff...) do {} while (0)
 #endif
 
 /* Make parport_wait_peripheral wake up.
--- linux-next-20200225.orig/drivers/parport/ieee1284_ops.c
+++ linux-next-20200225/drivers/parport/ieee1284_ops.c
@@ -30,7 +30,7 @@
 #ifdef DEBUG
 #define DPRINTK(stuff...) printk (stuff)
 #else
-#define DPRINTK(stuff...)
+#define DPRINTK(stuff...) do {} while (0)
 #endif
 
 /***                                *