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[RFC,1/9] kernel.h: add do_empty() macro

Message ID 20200418184111.13401-2-rdunlap@infradead.org
State New
Headers show
Series [RFC,1/9] kernel.h: add do_empty() macro | expand

Commit Message

Randy Dunlap April 18, 2020, 6:41 p.m. UTC 
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@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: linux-nfs@vger.kernel.org
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: linux-nvdimm@lists.01.org
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Cc: target-devel@vger.kernel.org
Cc: Zzy Wysm <zzy@zzywysm.com>
---
 include/linux/kernel.h |    8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

--- 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