linux-kernel - [PATCH 2/3] nilfs2: Convert __nilfs_msg to integrate the level and format

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Date:   Mon, 27 Jul 2020 23:28:30 +0900
From:   Ryusuke Konishi <konishi.ryusuke@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-nilfs <linux-nilfs@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] nilfs2: Convert __nilfs_msg to integrate the level and format

From: Joe Perches <joe@...ches.com>

Reduce object size a bit by removing the KERN_<LEVEL> as a
separate argument and adding it to the format string.

Reduce overall object size by about ~.5% (x86-64 defconfig w/ nilfs2)

old:
$ size -t fs/nilfs2/built-in.a | tail -1
 191738	   8676	     44	 200458	  30f0a	(TOTALS)

new:
$ size -t fs/nilfs2/built-in.a | tail -1
 190971	   8676	     44	 199691	  30c0b	(TOTALS)

Signed-off-by: Joe Perches <joe@...ches.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@...il.com>
---
 fs/nilfs2/nilfs.h |  9 ++++-----
 fs/nilfs2/super.c | 16 +++++++++++-----
 2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index 42395ba52da6..979a41016743 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -289,9 +289,8 @@ static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
 /* super.c */
 extern struct inode *nilfs_alloc_inode(struct super_block *);
 
-extern __printf(3, 4)
-void __nilfs_msg(struct super_block *sb, const char *level,
-		 const char *fmt, ...);
+__printf(2, 3)
+void __nilfs_msg(struct super_block *sb, const char *fmt, ...);
 extern __printf(3, 4)
 void __nilfs_error(struct super_block *sb, const char *function,
 		   const char *fmt, ...);
@@ -299,7 +298,7 @@ void __nilfs_error(struct super_block *sb, const char *function,
 #ifdef CONFIG_PRINTK
 
 #define nilfs_msg(sb, level, fmt, ...)					\
-	__nilfs_msg(sb, level, fmt, ##__VA_ARGS__)
+	__nilfs_msg(sb, level fmt, ##__VA_ARGS__)
 #define nilfs_error(sb, fmt, ...)					\
 	__nilfs_error(sb, __func__, fmt, ##__VA_ARGS__)
 
@@ -307,7 +306,7 @@ void __nilfs_error(struct super_block *sb, const char *function,
 
 #define nilfs_msg(sb, level, fmt, ...)					\
 	do {								\
-		no_printk(fmt, ##__VA_ARGS__);				\
+		no_printk(level fmt, ##__VA_ARGS__);			\
 		(void)(sb);						\
 	} while (0)
 #define nilfs_error(sb, fmt, ...)					\
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 5729ee86da9a..fef4821a1f0f 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -62,19 +62,25 @@
 static int nilfs_setup_super(struct super_block *sb, int is_mount);
 static int nilfs_remount(struct super_block *sb, int *flags, char *data);
 
-void __nilfs_msg(struct super_block *sb, const char *level, const char *fmt,
-		 ...)
+void __nilfs_msg(struct super_block *sb, const char *fmt, ...)
 {
 	struct va_format vaf;
 	va_list args;
+	int level;
 
 	va_start(args, fmt);
-	vaf.fmt = fmt;
+
+	level = printk_get_level(fmt);
+	vaf.fmt = printk_skip_level(fmt);
 	vaf.va = &args;
+
 	if (sb)
-		printk("%sNILFS (%s): %pV\n", level, sb->s_id, &vaf);
+		printk("%c%cNILFS (%s): %pV\n",
+		       KERN_SOH_ASCII, level, sb->s_id, &vaf);
 	else
-		printk("%sNILFS: %pV\n", level, &vaf);
+		printk("%c%cNILFS: %pV\n",
+		       KERN_SOH_ASCII, level, &vaf);
+
 	va_end(args);
 }
 
-- 
1.8.3.1