linux-kernel - Re: [PATCH v2 2/5] gpiolib: cdev: relocate debounce_period_us from struct gpio

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Date:   Thu, 14 Dec 2023 17:09:01 +0200
From:   Andy Shevchenko <andy@...nel.org>
To:     Kent Gibson <warthog618@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        brgl@...ev.pl, linus.walleij@...aro.org
Subject: Re: [PATCH v2 2/5] gpiolib: cdev: relocate debounce_period_us from
 struct gpio_desc

On Thu, Dec 14, 2023 at 05:03:03PM +0200, Andy Shevchenko wrote:
> On Thu, Dec 14, 2023 at 05:58:11PM +0800, Kent Gibson wrote:

...

> > +/*
> > + * Used to populate gpio_v2_line_info with cdev specific fields not contained
> > + * in the struct gpio_desc.
> > + * A line is determined to contain supplemental information by
> > + * line_is_supplemental().
> > + */
> > +static struct {
> > +	/* a rbtree of the struct lines containing the supplemental info */
> > +	struct rb_root tree;
> > +	/* covers tree */
> > +	spinlock_t lock;
> > +} supinfo;

Hmm... If I read the kernel-doc script it should support anonymous structs
and unions...

...

> > +static void supinfo_init(void)
> > +{
> > +	supinfo.tree = RB_ROOT;
> > +	spin_lock_init(&supinfo.lock);
> > +}
> 
> Can it be done statically?
> 
> supinfo = {
> 	.tree = RB_ROOT,
> 	.lock = __SPIN_LOCK_UNLOCKED(supinfo.lock),

I even checked the current tree, we have 32 users of this pattern in drivers/.

> };

-- 
With Best Regards,
Andy Shevchenko