On Tue 18-06-13 10:14:39, Joe Perches wrote:
> Reducing the object size ~5kb/15% could be useful for embedded
> systems.
>
> Add #ifdef CONFIG_PRINTK #else #endif blocks
> to hold formats and arguments, passing " " to
> functions when !CONFIG_PRINTK and still verifying
> format and arguments with no_printk.
>
> $ size fs/ext2/built-in.o*
> text data bss dec hex filename
> 31297 44 4 31345 7a71 fs/ext2/built-in.o.ext2.new
> 36288 44 4 36336 8df0 fs/ext2/built-in.o.ext2.old
>
> $ grep -E "CONFIG_EXT2|CONFIG_PRINTK" .config
> # CONFIG_PRINTK is not set
> CONFIG_EXT2_FS=y
> # CONFIG_EXT2_FS_XATTR is not set
> # CONFIG_EXT2_FS_XIP is not set
I'm somewhat reluctant to merge this unless I know someone really
cares. It looks a bit ugly to ifdef every function doing some printing just
to reduce object size when CONFIG_PRINTK is disabled... And in future LTO
might help us ;)
Honza
>
> Signed-off-by: Joe Perches <j...@perches.com>
> ---
> fs/ext2/ext2.h | 22 ++++++++++++++++++++--
> fs/ext2/super.c | 6 +++---
> 2 files changed, 23 insertions(+), 5 deletions(-)
>
> diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
> index d9a17d0..888ae31 100644
> --- a/fs/ext2/ext2.h
> +++ b/fs/ext2/ext2.h
> @@ -767,12 +767,30 @@ struct dentry *ext2_get_parent(struct dentry *child);
>
> /* super.c */
> extern __printf(3, 4)
> -void ext2_error(struct super_block *, const char *, const char *, ...);
> +void __ext2_error(struct super_block *, const char *, const char *, ...);
> extern __printf(3, 4)
> -void ext2_msg(struct super_block *, const char *, const char *, ...);
> +void __ext2_msg(struct super_block *, const char *, const char *, ...);
> extern void ext2_update_dynamic_rev (struct super_block *sb);
> extern void ext2_write_super (struct super_block *);
>
> +#ifdef CONFIG_PRINTK
> +#define ext2_error(sb, func, fmt, ...)
> \
> + __ext2_error(sb, func, fmt, ##__VA_ARGS__)
> +#define ext2_msg(sb, prefix, fmt, ...)
> \
> + __ext2_msg(sb, prefix, fmt, ##__VA_ARGS__)
> +#else
> +#define ext2_error(sb, func, fmt, ...)
> \
> +do { \
> + no_printk(fmt, ##__VA_ARGS__); \
> + __ext2_error(sb, func, " "); \
> +} while (0)
> +#define ext2_msg(sb, prefix, fmt, ...)
> \
> +do { \
> + no_printk(fmt, ##__VA_ARGS__); \
> + __ext2_msg(sb, prefix, " "); \
> +} while (0)
> +#endif
> +
> /*
> * Inodes and files operations
> */
> diff --git a/fs/ext2/super.c b/fs/ext2/super.c
> index 2885349..61ffb3f 100644
> --- a/fs/ext2/super.c
> +++ b/fs/ext2/super.c
> @@ -45,8 +45,8 @@ static int ext2_sync_fs(struct super_block *sb, int wait);
> static int ext2_freeze(struct super_block *sb);
> static int ext2_unfreeze(struct super_block *sb);
>
> -void ext2_error(struct super_block *sb, const char *function,
> - const char *fmt, ...)
> +void __ext2_error(struct super_block *sb, const char *function,
> + const char *fmt, ...)
> {
> struct va_format vaf;
> va_list args;
> @@ -80,7 +80,7 @@ void ext2_error(struct super_block *sb, const char
> *function,
> }
> }
>
> -void ext2_msg(struct super_block *sb, const char *prefix,
> +void __ext2_msg(struct super_block *sb, const char *prefix,
> const char *fmt, ...)
> {
> struct va_format vaf;
> --
> 1.8.1.2.459.gbcd45b4.dirty
>
--
Jan Kara <j...@suse.cz>
SUSE Labs, CR
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