Re: [RFC] dynamic_debug: introduce debug_hex_dump()

[Joe Perches <joe@perches.com>]

On Wed, 2012-11-14 at 14:17 +0200, Vladimir Kondratiev wrote:
> Introduce debug_hex_dump() that can be dynamically controlled, similar to
> pr_debug.

(added Jason Baron, Jim Cromie, GregKH and lkml to cc's)

[]
> diff --git a/include/linux/printk.h b/include/linux/printk.h
[]
> @@ -220,6 +220,20 @@ extern void dump_stack(void) __cold;
>  	no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
>  #endifD
>  
> +#if defined(CONFIG_DYNAMIC_DEBUG)
> +#define debug_hex_dump(prefix_str, prefix_type, rowsize,	\
> +		       groupsize, buf, len, ascii)		\
> +		       dynamic_hex_dump(prefix_str, prefix_type,\
> +					rowsize, groupsize, buf,\
> +					len, ascii)
> +#else
> +#define debug_hex_dump(prefix_str, prefix_type, rowsize,	\
> +		       groupsize, buf, len, ascii)		\
> +		       print_hex_dump(KERN_DEBUG, prefix_str,	\
> +				      prefix_type, rowsize,	\
> +				      groupsize, buf, len, ascii)
> +#endif

These should be in a different location after print_hex_dump
is declared. Also for #defines, the indentation doesn't
need to be so deep.

#if defined(CONFIG_DYNAMIC_DEBUG)
#define debug_hex_dump(prefix_str, prefix_type, rowsize,	\
		       groupsize, buf, len, ascii)		\
	dynamic_hex_dump(prefix_str, prefix_type,		\
			 rowsize, groupsize, buf, len, ascii)
#else
#define debug_hex_dump(prefix_str, prefix_type, rowsize,	\
		       groupsize, buf, len, ascii)		\
	print_hex_dump(KERN_DEBUG, prefix_str, prefix_type,	\
		       rowsize, groupsize, buf, len, ascii)
#endif

A better option might be to convert print_hex_dump_bytes()
to dynamic_debug as that's already KERN_DEBUG.  That
could be simpler overall and it makes existing calls
become dynamic as well.