linux-kernel - [PATCH] nilfs: avoid warning about unused variables

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Message-Id: <20160615201945.3348205-1-arnd@arndb.de>
Date:	Wed, 15 Jun 2016 22:19:41 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-nilfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] nilfs: avoid warning about unused variables

The newly added nilfs_msg() infrastructure caused a warning in
nilfs_clear_dirty_page() when it is disabled:

fs/nilfs2/page.c: In function 'nilfs_clear_dirty_page':
fs/nilfs2/page.c:402:22: error: unused variable 'sb' [-Werror=unused-variable]
  struct super_block *sb = inode->i_sb;

We can avoid the warning by adding a cast to void for the first
argument of the macro.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: aede53d223f0 ("nilfs2: replace nilfs_warning() with nilfs_msg()")
---
 fs/nilfs2/nilfs.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index b7064faef217..46fbd4e00315 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -317,7 +317,10 @@ void __nilfs_error(struct super_block *sb, const char *function,
 #else
 
 #define nilfs_msg(sb, level, fmt, ...)					\
-	no_printk(fmt, ##__VA_ARGS__)
+	do {								\
+		no_printk(fmt, ##__VA_ARGS__);				\
+		(void)(sb);						\
+	} while (0)
 #define nilfs_error(sb, fmt, ...)					\
 	do {								\
 		no_printk(fmt, ##__VA_ARGS__);				\
-- 
2.9.0