linux-kernel - Re: [PATCH 01/21] powerpc: Remove warning on array size when empty

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Date:   Tue, 27 Feb 2018 08:33:19 +0100
From:   Christophe LEROY <christophe.leroy@....fr>
To:     Mathieu Malaterre <malat@...ian.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Mackerras <paulus@...ba.org>,
        Jiri Slaby <jslaby@...e.com>,
        "open list:LINUX FOR POWERPC PA SEMI PWRFICIENT" 
        <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 01/21] powerpc: Remove warning on array size when empty



Le 27/02/2018 à 08:25, Mathieu Malaterre a écrit :
> On Mon, Feb 26, 2018 at 3:45 PM, Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
>> On Mon, Feb 26, 2018 at 4:44 PM, Andy Shevchenko
>> <andy.shevchenko@...il.com> wrote:
>>> On Sun, Feb 25, 2018 at 7:22 PM, Mathieu Malaterre <malat@...ian.org> wrote:
>>
>>>>   static void __init check_cpu_feature_properties(unsigned long node)
>>>>   {
>>>> -       unsigned long i;
>>>>          struct feature_property *fp = feature_properties;
>>>>          const __be32 *prop;
>>>>
>>>
>>> Much simpler is just add
>>>
>>> if (ARRAY_SIZE() == 0)
>>>   return;
>>>
>>>> -       for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
>>>> +       for (; fp != feature_properties + ARRAY_SIZE(feature_properties); ++fp) {
>>
>> ...or convert to while(), which will be more readable.
> 
> So you'd prefer something like:
> 
> while (fp < feature_properties + ARRAY_SIZE(feature_properties)) {
>    ...
>    ++fp;
> }
> 
> right ?
> 


Why not do as suggested by Segher, ie just replace < by != in the 
original form ?
Or add in front:
if (!ARRAY_SIZE(feature_properties))
	return;

Christophe