Re: [PATCH v2 4/7] gpio: mockup: improve readability

[Bartosz Golaszewski <brgl@xxxxxxxx>]

2017-05-31 16:57 GMT+02:00 Andy Shevchenko <andy.shevchenko@xxxxxxxxx>:
> On Wed, May 31, 2017 at 1:53 PM, Bartosz Golaszewski <brgl@xxxxxxxx> wrote:
>> 2017-05-30 20:55 GMT+02:00 Andy Shevchenko <andy.shevchenko@xxxxxxxxx>:
>>> On Tue, May 30, 2017 at 11:58 AM, Bartosz Golaszewski <brgl@xxxxxxxx> wrote:
>>>> We currently shift bits here and there without actually explaining
>>>> what we're doing. Add some helper variables with names indicating
>>>> their purpose to improve the code readability.
>>>
>>>> +       /* Each chip is described by two values. */
>>>> +       num_chips = gpio_mockup_params_nr / 2;
>>>> +
>>>> +       chips = devm_kzalloc(dev, sizeof(*chips) * num_chips, GFP_KERNEL);
>>>
>>> It's effectively
>>> devm_kcalloc()
>>> or
>>> devm_kmalloc_array()
>>> depending on the requirement of zeroing a memory chunks.
>
>> Is there any advantage to using one of these here?
>
> Yes, though subtle one in this case. The caller will not care about
> (possible) overflow in multiplication.
> Other (micro)optimizations might be in place in the future as well,
> but I dunno about this.
>
> I would suggest to change.
>

Ok, I'll change it both for the lines and for the chips arrays and add
a separate patch.

Thanks,
Bartosz
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