linux-kernel - Re: [PATCH v4 2/3] perf diff: color the Ratio column

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Date:	Wed, 4 Dec 2013 18:41:18 +0530
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Jiri Olsa <jolsa@...hat.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] perf diff: color the Ratio column

Arnaldo Carvalho de Melo wrote:
>> The issue with this suggestion is that the prototype of
>> percent_color_snprintf() is:
>>
>>   int percent_color_snprintf(char *bf, size_t size, const char *fmt, ...)
>>
>> So, I can only pass value_color_snprintf() a va_list, making its prototype:
>>
>>   int value_color_snprintf(char *bf, size_t size, const char *fmt, va_list args)
>>
>> Is this worth the minor rename?
>
> That is ok, I'd say. Or if that would be a problem one could consider
> using a macro, perhaps.

If value_color_snprintf has the prototype mentioned above, I'd have to
build a va_list at each callsite; how is that convenient? Considering
the macro, can we just do

  #define percent_color_snprintf value_color_snprintf

in color.h?

>> On a related note, does percent_color_snprintf() need to be a variadic
>> function? It only seems to process one percent value.
>
> I think that there are places where it is passed as a pointer that
> expects it to have that prototype, this is from memory, so please check.

I meant that the function body itself seems to be wrong:

  va_start(args, fmt);
  percent = va_arg(args, double);
  va_end(args);
  color = get_percent_color(percent);
  return color_snprintf(bf, size, color, fmt, percent);

Unless I've misunderstood something horribly, doesn't `percent' just
get assigned to the last argument in the `args' va_list?
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