linux-kernel - [RFC PATCH 1/9] kernel.h: add do

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Date:   Sat, 18 Apr 2020 11:41:03 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        linux-nfs@...r.kernel.org,
        Johannes Berg <johannes@...solutions.net>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, linux-nvdimm@...ts.01.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        Zzy Wysm <zzy@...wysm.com>
Subject: [RFC PATCH 1/9] kernel.h: add do_empty() macro

Add the do_empty() macro to silence gcc warnings about an empty body
following an "if" statement when -Wextra is used.

However, for debug printk calls that are being disabled, use either
no_printk() or pr_debug() [and optionally dynamic printk debugging]
instead.

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-input@...r.kernel.org
Cc: Jaroslav Kysela <perex@...ex.cz>
Cc: Takashi Iwai <tiwai@...e.com>
Cc: alsa-devel@...a-project.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
Cc: "J. Bruce Fields" <bfields@...ldses.org>
Cc: Chuck Lever <chuck.lever@...cle.com>
Cc: linux-nfs@...r.kernel.org
Cc: Johannes Berg <johannes@...solutions.net>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: linux-nvdimm@...ts.01.org
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org
Cc: target-devel@...r.kernel.org
Cc: Zzy Wysm <zzy@...wysm.com>
---
 include/linux/kernel.h |    8 ++++++++
 1 file changed, 8 insertions(+)

--- linux-next-20200327.orig/include/linux/kernel.h
+++ linux-next-20200327/include/linux/kernel.h
@@ -40,6 +40,14 @@
 #define READ			0
 #define WRITE			1
 
+/*
+ * When using -Wextra, an "if" statement followed by an empty block
+ * (containing only a ';'), produces a warning from gcc:
+ * warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
+ * Replace the empty body with do_empty() to silence this warning.
+ */
+#define do_empty()		do { } while (0)
+
 /**
  * ARRAY_SIZE - get the number of elements in array @arr
  * @arr: array to be sized