[PATCH] ext2: fix empty body warnings when -Wextra is used

* [PATCH] ext2: fix empty body warnings when -Wextra is used
@ 2020-03-23  2:45 Randy Dunlap
  2020-03-23  6:08 ` kbuild test robot
  2020-03-23 12:02 ` Jan Kara
  0 siblings, 2 replies; 3+ messages in thread
From: Randy Dunlap @ 2020-03-23  2:45 UTC (permalink / raw)
  To: Linux FS Devel, linux-ext4, Jan Kara

From: Randy Dunlap <rdunlap@infradead.org>

When EXT2_ATTR_DEBUG is not defined, modify the 2 debug macros
to use the no_printk() macro instead of <nothing>.
This fixes gcc warnings when -Wextra is used:

../fs/ext2/xattr.c:252:42: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
../fs/ext2/xattr.c:258:42: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
../fs/ext2/xattr.c:330:42: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
../fs/ext2/xattr.c:872:45: warning: suggest braces around empty body in an ‘else’ statement [-Wempty-body]

I have verified that the only object code change (with gcc 7.5.0) is
the reversal of some instructions from 'cmp a,b' to 'cmp b,a'.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jan Kara <jack@suse.com>
Cc: linux-ext4@vger.kernel.org
---
 fs/ext2/xattr.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- linux-next-20200320.orig/fs/ext2/xattr.c
+++ linux-next-20200320/fs/ext2/xattr.c
@@ -56,6 +56,7 @@
 
 #include <linux/buffer_head.h>
 #include <linux/init.h>
+#include <linux/printk.h>
 #include <linux/slab.h>
 #include <linux/mbcache.h>
 #include <linux/quotaops.h>
@@ -84,8 +85,8 @@
 		printk("\n"); \
 	} while (0)
 #else
-# define ea_idebug(f...)
-# define ea_bdebug(f...)
+# define ea_idebug(inode, f...)	no_printk(f)
+# define ea_bdebug(bh, f...)	no_printk(f)
 #endif
 
 static int ext2_xattr_set2(struct inode *, struct buffer_head *,


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