linux-kernel - Re: [PATCH 5/6] gpiolib: cdev: consolidate edge detector configuration flags

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Date:   Wed, 13 Jul 2022 13:29:13 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Kent Gibson <warthog618@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Dipen Patel <dipenp@...dia.com>
Subject: Re: [PATCH 5/6] gpiolib: cdev: consolidate edge detector
 configuration flags

On Wed, Jul 13, 2022 at 12:25 PM Kent Gibson <warthog618@...il.com> wrote:
> On Wed, Jul 13, 2022 at 12:07:29PM +0200, Andy Shevchenko wrote:
> > On Wed, Jul 13, 2022 at 3:39 AM Kent Gibson <warthog618@...il.com> wrote:

...

> > >         struct linereq *lr;
> > >         struct gpio_v2_line_event le;
> > >         int level;
> > > -       u64 eflags;
> > > +       u64 edflags;
> >
> > I would at the same time move it up before `int level;`.
>
> Ok.  What is the general rule you want applied, cos I'm not seeing it.

Common sense.
But here are two informal recommendations:
1) longer line first;
2) you may still group by struct, POD or other flavours (see below).

...

> > > +       int level = -1, diff_seqno;
> > > +       u64 eflags, edflags = READ_ONCE(line->edflags);
> >
> > Ditto.

Here is obviously the longer line case.

...

> > >         u32 debounce_period_us;
> > >         unsigned long irqflags = 0;
> > >         int irq, ret;
> > > +       u64 eflags;
> >
> > Ditto for similarity.

Here and in other cases above, swapping them won't interleave the
types grouping (like int-u64-int). But in some cases it's allowed when
you put the last definition in the block the definition of the
variable that keeps the returned value.

-- 
With Best Regards,
Andy Shevchenko