Re: [PATCH] vsprintf.c: remove stack variable ksym from

[Paulo Marques <pmarques@grupopie.com>]

Joe Perches wrote:
> On Sat, 2010-03-13 at 09:44 -0800, Joe Perches wrote:
>> On Sat, 2010-03-13 at 07:35 -0800, Linus Torvalds wrote:
>>> On Fri, 12 Mar 2010, Andrew Morton wrote:
>>>> nice.
>>> But the kallsyms_lookup()/sprint_symbol() functions don't take a 
>>> length parameter, so we have to do the worst-case thing (which itself has 
>>> tons of unnecessary padding).
>> Perhaps a new snprint_symbol function with the
>> other kallsyms... functions changed as necessary.
> 
> Perhaps something like this:

Just one minor nit:

[...]
>  
> -	*result = '\0';
> +	if (size)
> +		*result = '\0';

This test seems to be here to handle the "size == 0" case, but

>[...]
> +const char *kallsyms_lookup_n(unsigned long addr,
> +			      unsigned long *symbolsize,
> +			      unsigned long *offset,
> +			      char **modname, char *namebuf, size_t size)
> +{
> +	if (size)
> +		namebuf[size - 1] = 0;
> +	namebuf[0] = 0;

here we seem to write the namebuf[0] even if "size == 0". So maybe both
assignments in this function should be inside the "if (size)" test.

Other than that, the patch looks good:

Reviewed-by: Paulo Marques <pmarques@grupopie.com>

-- 
Paulo Marques - www.grupopie.com

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