linux-kernel - Re: linux-4.14-rc3/arch/powerpc/perf/imc-pmu.c:599: pointless test ?

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Date:   Mon, 9 Oct 2017 17:08:47 +0530
From:   Anju T Sudhakar <anju@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        David Binderman <dcb314@...mail.com>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "paulus@...ba.org" <paulus@...ba.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: linux-4.14-rc3/arch/powerpc/perf/imc-pmu.c:599: pointless test ?

Hi David,


On Monday 09 October 2017 10:31 AM, Michael Ellerman wrote:
> David Binderman <dcb314@...mail.com> writes:
>> Hello there,
>>
>> linux-4.14-rc3/arch/powerpc/perf/imc-pmu.c:599]: (style) Unsigned variable 'ncpu' can't be negative so it is unnecessary to test it.
>>
>> Source code is
>>
>>      if (ncpu >= 0 && ncpu < nr_cpu_ids) {
>>
>> but
>>
>>      unsigned int ncpu, core_id;
>>
>> Suggest remove test.

Nice catch. Thanks for mentioning this. I will fix this.

Thanks,
Anju
> Thanks.
>
> Notifying the author would be more helpful:
>
> $ git blame -L 599,599 arch/powerpc/perf/imc-pmu.c
> 39a846db1d574 (Anju T Sudhakar 2017-07-19 03:06:35 +0530 599)   if (ncpu >= 0 && ncpu < nr_cpu_ids) {
> $ git log -1 --format=%ae 39a846db1d574
> anju@...ux.vnet.ibm.com
>
> cheers
>