[PATCH 0/2] ath: Reduce logging message code size

[PATCH 0/2] ath: Reduce logging message code size

[Joe Perches]

Reduces size ~5KB in an allyesconfig.

Joe Perches (2):
  ath: Make ath_dbg void not int
  ath: Make ath_printk void not int and remove unused struct ath_common *

 drivers/net/wireless/ath/ath.h  |   48 +++++++++++++++++++-------------------
 drivers/net/wireless/ath/main.c |    8 +-----
 2 files changed, 26 insertions(+), 30 deletions(-)

-- 
1.7.6.405.gc1be0

[PATCH 1/2] ath: Make ath_dbg void not int

[Joe Perches]

The return value is never used so make it void.

Reduces object size a tiny bit.

$ size drivers/net/wireless/ath/built-in.o*
   text	   data	    bss	    dec	    hex	filename
1164175	  16235	 212032	1392442	 153f3a	drivers/net/wireless/ath/built-in.o.new
1164819	  16235	 212032	1393086	 1541be	drivers/net/wireless/ath/built-in.o.old

Signed-off-by: Joe Perches <joe@perches.com>
---
 drivers/net/wireless/ath/ath.h |   29 ++++++++++++-----------------
 1 files changed, 12 insertions(+), 17 deletions(-)

diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
index 17c4b56..a3f8505 100644
--- a/drivers/net/wireless/ath/ath.h
+++ b/drivers/net/wireless/ath/ath.h
@@ -178,8 +178,9 @@ bool ath_hw_keyreset(struct ath_common *common, u16 entry);
 void ath_hw_cycle_counters_update(struct ath_common *common);
 int32_t ath_hw_get_listen_time(struct ath_common *common);
 
-extern __attribute__ ((format (printf, 3, 4))) int
-ath_printk(const char *level, struct ath_common *common, const char *fmt, ...);
+extern __attribute__((format (printf, 3, 4)))
+int ath_printk(const char *level, struct ath_common *common,
+	       const char *fmt, ...);
 
 #define ath_emerg(common, fmt, ...)				\
 	ath_printk(KERN_EMERG, common, fmt, ##__VA_ARGS__)
@@ -246,27 +247,21 @@ enum ATH_DEBUG {
 
 #ifdef CONFIG_ATH_DEBUG
 
-#define ath_dbg(common, dbg_mask, fmt, ...)			\
-({								\
-	int rtn;						\
-	if ((common)->debug_mask & dbg_mask)			\
-		rtn = ath_printk(KERN_DEBUG, common, fmt,	\
-				 ##__VA_ARGS__);		\
-	else							\
-		rtn = 0;					\
-								\
-	rtn;							\
-})
+#define ath_dbg(common, dbg_mask, fmt, ...)				\
+do {									\
+	if ((common)->debug_mask & dbg_mask)				\
+		ath_printk(KERN_DEBUG, common, fmt, ##__VA_ARGS__);	\
+} while (0)
+
 #define ATH_DBG_WARN(foo, arg...) WARN(foo, arg)
 #define ATH_DBG_WARN_ON_ONCE(foo) WARN_ON_ONCE(foo)
 
 #else
 
-static inline  __attribute__ ((format (printf, 3, 4))) int
-ath_dbg(struct ath_common *common, enum ATH_DEBUG dbg_mask,
-	const char *fmt, ...)
+static inline  __attribute__((format (printf, 3, 4)))
+void ath_dbg(struct ath_common *common, enum ATH_DEBUG dbg_mask,
+	     const char *fmt, ...)
 {
-	return 0;
 }
 #define ATH_DBG_WARN(foo, arg...) do {} while (0)
 #define ATH_DBG_WARN_ON_ONCE(foo) ({				\
-- 
1.7.6.405.gc1be0

[PATCH 2/2] ath: Make ath_printk void not int and remove unused struct ath_common *

[Joe Perches]

Changing the return type and removing the unused argument from
ath_printk reduces code size.

Add an __always_unused struct ath_common * to the macros
that call ath_printk to avoid unused variable warnings.

$ size drivers/net/wireless/ath/built-in.o*
   text	   data	    bss	    dec	    hex	filename
1159859	  16235	 212000	1388094	 152e3e	drivers/net/wireless/ath/built-in.o.new
1164175	  16235	 212032	1392442	 153f3a	drivers/net/wireless/ath/built-in.o.old

Signed-off-by: Joe Perches <joe@perches.com>
---
 drivers/net/wireless/ath/ath.h  |   27 ++++++++++++++++-----------
 drivers/net/wireless/ath/main.c |    8 ++------
 2 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
index a3f8505..9891fb6 100644
--- a/drivers/net/wireless/ath/ath.h
+++ b/drivers/net/wireless/ath/ath.h
@@ -178,24 +178,29 @@ bool ath_hw_keyreset(struct ath_common *common, u16 entry);
 void ath_hw_cycle_counters_update(struct ath_common *common);
 int32_t ath_hw_get_listen_time(struct ath_common *common);
 
-extern __attribute__((format (printf, 3, 4)))
-int ath_printk(const char *level, struct ath_common *common,
-	       const char *fmt, ...);
+extern __attribute__((format (printf, 2, 3)))
+void ath_printk(const char *level, const char *fmt, ...);
+
+#define _ath_printk(level, common, fmt, ...)			\
+do {								\
+	__always_unused struct ath_common *unused = common;	\
+	ath_printk(level, fmt, ##__VA_ARGS__);			\
+} while (0)
 
 #define ath_emerg(common, fmt, ...)				\
-	ath_printk(KERN_EMERG, common, fmt, ##__VA_ARGS__)
+	_ath_printk(KERN_EMERG, common, fmt, ##__VA_ARGS__)
 #define ath_alert(common, fmt, ...)				\
-	ath_printk(KERN_ALERT, common, fmt, ##__VA_ARGS__)
+	_ath_printk(KERN_ALERT, common, fmt, ##__VA_ARGS__)
 #define ath_crit(common, fmt, ...)				\
-	ath_printk(KERN_CRIT, common, fmt, ##__VA_ARGS__)
+	_ath_printk(KERN_CRIT, common, fmt, ##__VA_ARGS__)
 #define ath_err(common, fmt, ...)				\
-	ath_printk(KERN_ERR, common, fmt, ##__VA_ARGS__)
+	_ath_printk(KERN_ERR, common, fmt, ##__VA_ARGS__)
 #define ath_warn(common, fmt, ...)				\
-	ath_printk(KERN_WARNING, common, fmt, ##__VA_ARGS__)
+	_ath_printk(KERN_WARNING, common, fmt, ##__VA_ARGS__)
 #define ath_notice(common, fmt, ...)				\
-	ath_printk(KERN_NOTICE, common, fmt, ##__VA_ARGS__)
+	_ath_printk(KERN_NOTICE, common, fmt, ##__VA_ARGS__)
 #define ath_info(common, fmt, ...)				\
-	ath_printk(KERN_INFO, common, fmt, ##__VA_ARGS__)
+	_ath_printk(KERN_INFO, common, fmt, ##__VA_ARGS__)
 
 /**
  * enum ath_debug_level - atheros wireless debug level
@@ -250,7 +255,7 @@ enum ATH_DEBUG {
 #define ath_dbg(common, dbg_mask, fmt, ...)				\
 do {									\
 	if ((common)->debug_mask & dbg_mask)				\
-		ath_printk(KERN_DEBUG, common, fmt, ##__VA_ARGS__);	\
+		_ath_printk(KERN_DEBUG, common, fmt, ##__VA_ARGS__);	\
 } while (0)
 
 #define ATH_DBG_WARN(foo, arg...) WARN(foo, arg)
diff --git a/drivers/net/wireless/ath/main.c b/drivers/net/wireless/ath/main.c
index c325202..d9218fe 100644
--- a/drivers/net/wireless/ath/main.c
+++ b/drivers/net/wireless/ath/main.c
@@ -57,22 +57,18 @@ struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,
 }
 EXPORT_SYMBOL(ath_rxbuf_alloc);
 
-int ath_printk(const char *level, struct ath_common *common,
-	       const char *fmt, ...)
+void ath_printk(const char *level, const char *fmt, ...)
 {
 	struct va_format vaf;
 	va_list args;
-	int rtn;
 
 	va_start(args, fmt);
 
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	rtn = printk("%sath: %pV", level, &vaf);
+	printk("%sath: %pV", level, &vaf);
 
 	va_end(args);
-
-	return rtn;
 }
 EXPORT_SYMBOL(ath_printk);
-- 
1.7.6.405.gc1be0

Re: [PATCH 2/2] ath: Make ath_printk void not int and remove unused struct ath_common *

[John W. Linville]

On Fri, Aug 26, 2011 at 01:56:39AM -0700, Joe Perches wrote:
> Changing the return type and removing the unused argument from
> ath_printk reduces code size.
> 
> Add an __always_unused struct ath_common * to the macros
> that call ath_printk to avoid unused variable warnings.
> 
> $ size drivers/net/wireless/ath/built-in.o*
>    text	   data	    bss	    dec	    hex	filename
> 1159859	  16235	 212000	1388094	 152e3e	drivers/net/wireless/ath/built-in.o.new
> 1164175	  16235	 212032	1392442	 153f3a	drivers/net/wireless/ath/built-in.o.old
> 
> Signed-off-by: Joe Perches <joe@perches.com>
> ---
>  drivers/net/wireless/ath/ath.h  |   27 ++++++++++++++++-----------
>  drivers/net/wireless/ath/main.c |    8 ++------
>  2 files changed, 18 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h
> index a3f8505..9891fb6 100644
> --- a/drivers/net/wireless/ath/ath.h
> +++ b/drivers/net/wireless/ath/ath.h
> @@ -178,24 +178,29 @@ bool ath_hw_keyreset(struct ath_common *common, u16 entry);
>  void ath_hw_cycle_counters_update(struct ath_common *common);
>  int32_t ath_hw_get_listen_time(struct ath_common *common);
>  
> -extern __attribute__((format (printf, 3, 4)))
> -int ath_printk(const char *level, struct ath_common *common,
> -	       const char *fmt, ...);
> +extern __attribute__((format (printf, 2, 3)))
> +void ath_printk(const char *level, const char *fmt, ...);
> +
> +#define _ath_printk(level, common, fmt, ...)			\
> +do {								\
> +	__always_unused struct ath_common *unused = common;	\
> +	ath_printk(level, fmt, ##__VA_ARGS__);			\
> +} while (0)
>  
>  #define ath_emerg(common, fmt, ...)				\
> -	ath_printk(KERN_EMERG, common, fmt, ##__VA_ARGS__)
> +	_ath_printk(KERN_EMERG, common, fmt, ##__VA_ARGS__)
>  #define ath_alert(common, fmt, ...)				\
> -	ath_printk(KERN_ALERT, common, fmt, ##__VA_ARGS__)
> +	_ath_printk(KERN_ALERT, common, fmt, ##__VA_ARGS__)
>  #define ath_crit(common, fmt, ...)				\
> -	ath_printk(KERN_CRIT, common, fmt, ##__VA_ARGS__)
> +	_ath_printk(KERN_CRIT, common, fmt, ##__VA_ARGS__)
>  #define ath_err(common, fmt, ...)				\
> -	ath_printk(KERN_ERR, common, fmt, ##__VA_ARGS__)
> +	_ath_printk(KERN_ERR, common, fmt, ##__VA_ARGS__)
>  #define ath_warn(common, fmt, ...)				\
> -	ath_printk(KERN_WARNING, common, fmt, ##__VA_ARGS__)
> +	_ath_printk(KERN_WARNING, common, fmt, ##__VA_ARGS__)
>  #define ath_notice(common, fmt, ...)				\
> -	ath_printk(KERN_NOTICE, common, fmt, ##__VA_ARGS__)
> +	_ath_printk(KERN_NOTICE, common, fmt, ##__VA_ARGS__)
>  #define ath_info(common, fmt, ...)				\
> -	ath_printk(KERN_INFO, common, fmt, ##__VA_ARGS__)
> +	_ath_printk(KERN_INFO, common, fmt, ##__VA_ARGS__)
>  
>  /**
>   * enum ath_debug_level - atheros wireless debug level

Any reason to preserve all these "common" args?

-- 
John W. Linville		Someday the world will need a hero, and you
linville@tuxdriver.com			might be all we have.  Be ready.

Re: [PATCH 2/2] ath: Make ath_printk void not int and remove unused struct ath_common *

[Joe Perches]

On Mon, 2011-08-29 at 14:12 -0400, John W. Linville wrote:
> On Fri, Aug 26, 2011 at 01:56:39AM -0700, Joe Perches wrote:
> > Changing the return type and removing the unused argument from
> > ath_printk reduces code size.
> > Add an __always_unused struct ath_common * to the macros
> > that call ath_printk to avoid unused variable warnings.
> > $ size drivers/net/wireless/ath/built-in.o*
> >    text	   data	    bss	    dec	    hex	filename
> > 1159859	  16235	 212000	1388094	 152e3e	drivers/net/wireless/ath/built-in.o.new
> > 1164175	  16235	 212032	1392442	 153f3a	drivers/net/wireless/ath/built-in.o.old
[]
> > +#define _ath_printk(level, common, fmt, ...)			\
> > +do {								\
> > +	__always_unused struct ath_common *unused = common;	\
> > +	ath_printk(level, fmt, ##__VA_ARGS__);			\
> > +} while (0)
[]
> >  #define ath_emerg(common, fmt, ...)				\
> > -	ath_printk(KERN_EMERG, common, fmt, ##__VA_ARGS__)
> > +	_ath_printk(KERN_EMERG, common, fmt, ##__VA_ARGS__)
[]
> Any reason to preserve all these "common" args?

ath_dbg uses common, the other ath_<level>s do not.

So, other than to avoid modifying all the current uses?
Maybe just consistency or a future use case.

Or not.

I think using the macro to avoid larger line changes is
an acceptable minimal change.