[PATCH AUTOSEL 4.4 13/14] ext2: fix empty body warnings when -Wextra is used

From: Sasha Levin
Date: Wed Apr 15 2020 - 08:02:43 EST


From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

[ Upstream commit 44a52022e7f15cbaab957df1c14f7a4f527ef7cf ]

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 âifâ statement [-Wempty-body]
../fs/ext2/xattr.c:258:42: warning: suggest braces around empty body in an âifâ statement [-Wempty-body]
../fs/ext2/xattr.c:330:42: warning: suggest braces around empty body in an âifâ statement [-Wempty-body]
../fs/ext2/xattr.c:872:45: warning: suggest braces around empty body in an âelseâ 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'.

Link: https://lore.kernel.org/r/e18a7395-61fb-2093-18e8-ed4f8cf56248@xxxxxxxxxxxxx
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxxx>
Cc: linux-ext4@xxxxxxxxxxxxxxx
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/ext2/xattr.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index 22d817dc821e9..6f6f4f89a2f0c 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -55,6 +55,7 @@

#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>
@@ -85,8 +86,8 @@
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 *,
--
2.20.1