Re: [PATCH] scsi: Make functions out of logging macros.

[Nao Nishijima <nao.nishijima.xt@hitachi.com>]

Hi, Joe

Thank you for looking at this patch.
Your patch sounds great. I will test the patch.

Best regards,

(2011/07/09 14:42), Joe Perches wrote:
> Reduce size of code and text of scmd_printk and sd_printk
> macros by converting to the macros to functions and using
> vsprintf extension %pV.  This moves the code out-of-line
> and centralizes the code used to emit additional arguments.
> 
> Save ~32KB of space in an x86 allyesconfig.
> 
> $ size drivers/scsi/built-in.o*
>    text	   data	    bss	    dec	    hex	filename
> 5860439	 135396	1393024	7388859	 70bebb	drivers/scsi/built-in.o.new
> 5882368	 135396	1395848	7413612	 711f6c	drivers/scsi/built-in.o.old
> 5887100	 135396	1397264	7419760	 713770	drivers/scsi/built-in.o.with_patch_1_and_2
> 
> Signed-off-by: Joe Perches <joe@perches.com>
> 
> ---
> 
> Re: [RFC PATCH 2/4] sd: modify printk for alias_name
> 
> On Fri, 2011-07-08 at 17:46 +0900, Nao Nishijima wrote: 
>> This patch modify sd_printk() and scmd_printk() to use alias_name. If user set
>> an alias_name, those print an alias_name instead of a disk_name.
>  
> Instead of larding more function/macros into these
> relatively heavily used logging macros, how about
> converting the logging macros into functions?
> 
>  drivers/scsi/scsi_lib.c    |   26 ++++++++++++++++++++++++++
>  drivers/scsi/sd.c          |   23 +++++++++++++++++++++++
>  drivers/scsi/sd.h          |    8 +++-----
>  include/scsi/scsi_device.h |    8 +++-----
>  4 files changed, 55 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index ec1803a..249c54c 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -2571,3 +2571,29 @@ void scsi_kunmap_atomic_sg(void *virt)
>  	kunmap_atomic(virt, KM_BIO_SRC_IRQ);
>  }
>  EXPORT_SYMBOL(scsi_kunmap_atomic_sg);
> +
> +/* Logging utilities */
> +
> +int scmd_printk(const char *prefix, const struct scsi_cmnd *scmd,
> +		const char *format, ...)
> +{
> +	struct va_format vaf;
> +	va_list args;
> +	int r;
> +
> +	va_start(args, format);
> +
> +	vaf.fmt = format;
> +	vaf.va = &args;
> +
> +	if (scmd->request->rq_disk)
> +		r = sdev_printk(prefix, scmd->device, "[%s] %pV",
> +				alias_name(scmd->request->rq_disk), &vaf);
> +	else
> +		r = sdev_printk(prefix, scmd->device, "%pV", &vaf);
> +
> +	va_end(args);
> +
> +	return r;
> +}
> +EXPORT_SYMBOL(scmd_printk);
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 953773c..2251e01 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -2888,3 +2888,26 @@ static void sd_print_result(struct scsi_disk *sdkp, int result)
>  	scsi_show_result(result);
>  }
>  
> +int sd_printk(const char *prefix, const struct scsi_disk *sdsk,
> +	      const char *format, ...)
> +{
> +	struct va_format vaf;
> +	va_list args;
> +	int r;
> +
> +	va_start(args, format);
> +
> +	vaf.fmt = format;
> +	vaf.va = &args;
> +
> +	if (sdsk->disk)
> +		r = sdev_printk(prefix, sdsk->device, "[%s] %pV",
> +				alias_name(sdsk->disk), &vaf);
> +	else
> +		r = sdev_printk(prefix, sdsk->device, "%pV", &vaf);
> +
> +	va_end(args);
> +
> +	return r;
> +}
> +EXPORT_SYMBOL(sd_printk);
> diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
> index 6ad798b..46aa748 100644
> --- a/drivers/scsi/sd.h
> +++ b/drivers/scsi/sd.h
> @@ -88,11 +88,9 @@ static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
>  	return container_of(disk->private_data, struct scsi_disk, driver);
>  }
>  
> -#define sd_printk(prefix, sdsk, fmt, a...)				\
> -        (sdsk)->disk ?							\
> -	sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,		\
> -		    (sdsk)->disk->disk_name, ##a) :			\
> -	sdev_printk(prefix, (sdsk)->device, fmt, ##a)
> +extern __attribute__((format (printf, 3, 4)))
> +int sd_printk(const char *prefix, const struct scsi_disk *sdsk,
> +	      const char *format, ...);
>  
>  /*
>   * A DIF-capable target device can be formatted with different
> diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
> index dd82e02..c79631b 100644
> --- a/include/scsi/scsi_device.h
> +++ b/include/scsi/scsi_device.h
> @@ -216,11 +216,9 @@ struct scsi_dh_data {
>  #define sdev_printk(prefix, sdev, fmt, a...)	\
>  	dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a)
>  
> -#define scmd_printk(prefix, scmd, fmt, a...)				\
> -        (scmd)->request->rq_disk ?					\
> -	sdev_printk(prefix, (scmd)->device, "[%s] " fmt,		\
> -		    (scmd)->request->rq_disk->disk_name, ##a) :		\
> -	sdev_printk(prefix, (scmd)->device, fmt, ##a)
> +extern __attribute__((format (printf, 3, 4)))
> +int scmd_printk(const char *prefix, const struct scsi_cmnd *scmd,
> +		const char *format, ...);
>  
>  enum scsi_target_state {
>  	STARGET_CREATED = 1,


-- 
Nao NISHIJIMA
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., YOKOHAMA Research  Laboratory
Email： nao.nishijima.xt@hitachi.com