linux-kernel - Re: [PATCH v2 09/10] gpiolib: use gpiochip_dup_line_label() in for

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Date:   Thu, 30 Nov 2023 19:54:14 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v2 09/10] gpiolib: use gpiochip_dup_line_label() in
 for_each helpers

On Thu, Nov 30, 2023 at 06:42:37PM +0100, Bartosz Golaszewski wrote:
> On Thu, Nov 30, 2023 at 5:40 PM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > On Thu, Nov 30, 2023 at 02:46:29PM +0100, Bartosz Golaszewski wrote:

...

> > >  const char *gpiochip_is_requested(struct gpio_chip *gc, unsigned int offset);
> > >  char *gpiochip_dup_line_label(struct gpio_chip *gc, unsigned int offset);
> > >
> > > +
> >
> > One blank line is enough.
> >
> > > +struct _gpiochip_for_each_data {
> > > +     const char **label;
> > > +     int *i;
> >
> > Why is this a signed?
> 
> Some users use signed, others use unsigned. It doesn't matter as we
> can't overflow it with the limit on the lines we have.

What's the problem to make it unsigned and be done with that for good?

> > > +};

...

> > > +DEFINE_CLASS(_gpiochip_for_each_data,
> > > +          struct _gpiochip_for_each_data,
> > > +          if (*_T.label) kfree(*_T.label),
> > > +          ({ struct _gpiochip_for_each_data _data = { label, i };
> > > +             *_data.i = 0;
> > > +             _data; }),
> >
> > To me indentation of ({}) is quite weird. Where is this style being used
> > instead of more readable
> 
> There are no guidelines for this type of C abuse AFAIK. The macro may
> be ugly but at least it hides the details from users which look nice
> instead.

If we can make it more readable for free, why not doing that way?

> >         ({
> >            ...
> >         })
> >
> > ?

-- 
With Best Regards,
Andy Shevchenko