linux-kernel - Re: [PATCH 1/1] drivers/edac/edac_module.c: remove unnecessary test on unsigned value

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Date:	Thu, 17 Jul 2014 15:26:26 +0300
From:	Andrey Utkin <andrey.krieger.utkin@...il.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Fabian Frederick <fabf@...net.be>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Doug Thompson <dougthompson@...ssion.com>
Subject: Re: [PATCH 1/1] drivers/edac/edac_module.c: remove unnecessary test
 on unsigned value

2014-06-10 21:27 GMT+03:00 Borislav Petkov <bp@...en8.de>:
> On Mon, Jun 09, 2014 at 09:20:18PM +0200, Fabian Frederick wrote:
>> unsigned long value is never < 0
>>
>> Cc: Doug Thompson <dougthompson@...ssion.com>
>> Cc: Borislav Petkov <bp@...en8.de>
>> Signed-off-by: Fabian Frederick <fabf@...net.be>
>> ---
>>  drivers/edac/edac_module.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/edac/edac_module.c b/drivers/edac/edac_module.c
>> index a66941f..e6d1691 100644
>> --- a/drivers/edac/edac_module.c
>> +++ b/drivers/edac/edac_module.c
>> @@ -28,7 +28,7 @@ static int edac_set_debug_level(const char *buf, struct kernel_param *kp)
>>       if (ret)
>>               return ret;
>>
>> -     if (val < 0 || val > 4)
>> +     if (val > 4)
>>               return -EINVAL;
>
> Ok, so I don't know how you caught this but FWIW, we have those W= build
> switches which trigger it too (which is a good thing that we have them
> :-))
>
> $ make W=1 drivers/edac/edac_module.o
>
> ...
>
> drivers/edac/edac_module.c: In function 'edac_set_debug_level':
> drivers/edac/edac_module.c:31:2: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
>   if (val < 0 || val > 4)
>
> Applied, thanks.

This hasn't got into none of v3.16-rc5 release, repos "linux-stable"
and "torvalds/linux".
See https://bugzilla.kernel.org/show_bug.cgi?id=80431

-- 
Andrey Utkin
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