linux-kernel - Re: [PATCH 1/3] drivers-core: make structured logging play nice with dynamic-debug

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Date:	Mon, 23 Jul 2012 09:07:59 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	Jim Cromie <jim.cromie@...il.com>, greg@...ah.com
Cc:	linux-kernel@...r.kernel.org, kay@...y.com, joe@...ches.com
Subject: Re: [PATCH 1/3] drivers-core: make structured logging play nice with
 dynamic-debug

On Thu, Jul 19, 2012 at 01:46:20PM -0600, Jim Cromie wrote:
> commit c4e00daaa96d3a0786f1f4fe6456281c60ef9a16 changed __dev_printk
> in a way that broke dynamic-debug's ability to control the dynamic
> prefix of dev_dbg(dev,..), but not dev_dbg(NULL,..) or pr_debug(..),
> which is why it wasnt noticed sooner.
> 
> When dev==NULL, __dev_printk() just calls printk(), which just works.
> But otherwise, it assumed that level was always a string like "<L>"
> and just plucked out the 'L', ignoring the rest.  However,
> dynamic_emit_prefix() adds "[tid] module:func:line:" to the string,
> those additions all got lost.
> 
> Signed-off-by: Jim Cromie <jim.cromie@...il.com>
> ---
>  drivers/base/core.c |    9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 

Acked-by: Jason Baron <jbaron@...hat.com>


> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 346be8b..ebdb7c5 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -1848,6 +1848,7 @@ int __dev_printk(const char *level, const struct device *dev,
>  		 struct va_format *vaf)
>  {
>  	char dict[128];
> +	const char *level_extra = "";
>  	size_t dictlen = 0;
>  	const char *subsys;
>  
> @@ -1894,10 +1895,14 @@ int __dev_printk(const char *level, const struct device *dev,
>  				    "DEVICE=+%s:%s", subsys, dev_name(dev));
>  	}
>  skip:
> +	if (level[3])
> +		level_extra = &level[3]; /* skip past "<L>" */
> +
>  	return printk_emit(0, level[1] - '0',
>  			   dictlen ? dict : NULL, dictlen,
> -			   "%s %s: %pV",
> -			   dev_driver_string(dev), dev_name(dev), vaf);
> +			   "%s %s: %s%pV", 
> +			   dev_driver_string(dev), dev_name(dev),
> +			   level_extra, vaf);
>  }
>  EXPORT_SYMBOL(__dev_printk);
>  
> -- 
> 1.7.10.4
> 
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