linux-kernel - Re: [PATCH] drivers: video: Remove useless checks

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Date:	Thu, 26 May 2011 10:30:03 +0100
From:	Maxin B John <maxin.john@...il.com>
To:	tim.gardner@...onical.com
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	airlied@...hat.com, lethal@...ux-sh.org, james@...anarts.com,
	error27@...il.com, randy.dunlap@...cle.com
Subject: Re: [PATCH] drivers: video: Remove useless checks

Hi,

On Wed, May 25, 2011 at 1:47 PM, Tim Gardner <tim.gardner@...onical.com> wrote:
> On 05/19/2011 12:27 PM, Maxin B John wrote:
>>
>> Comparing unsigned less than zero will never be true.
>> Removing similar checks from 'fbmem.c' and 'fbcmap.c'.
>
> Looks right to me, though there are other places that suffer from the same
> issue. See fb_set_cmap() and its use of 'int start' and cmap->start.

Thank you very much for reviewing the patch. As per your suggestion, I
have checked
the scenario is fb_set_cmap() and the use of 'int start' and 'cmap->start'.

IMHO, that scenario doesn't fall under the comparison of unsigned int
< 0. That scenario
looks similar to the below given code to me:
/*---------------------------------*/
#include <stdio.h>

int
main ()
{
  unsigned int u_int = -1;
  int s_int = 0;
  s_int = u_int;
  if (s_int < 0)
    printf ("s_int is less than 0\n");
  return 0;
}
/*---------------------------------*/

Please let me know your comments.

Best Regards,
Maxin
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