linux-kernel - Re: [RFC PATCH] gpiolib: remove extra

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Date: Thu, 21 Dec 2023 14:52:05 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Kent Gibson <warthog618@...il.com>, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFC PATCH] gpiolib: remove extra_checks

On Thu, Dec 21, 2023 at 10:26:03AM +0100, Bartosz Golaszewski wrote:
> On Wed, Dec 20, 2023 at 4:28 PM Linus Walleij <linus.walleij@...aro.org> wrote:
> > On Wed, Dec 20, 2023 at 3:03 PM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
> > > On Tue, Dec 19, 2023 at 09:11:02PM +0100, Bartosz Golaszewski wrote:
> > > > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > > >
> > > > extra_checks is only used in a few places. It also depends on
> > >
> > > > a non-standard DEBUG define one needs to add to the source file.
> > >
> > > Huh?!
> > >
> > > What then CONFIG_DEBUG_GPIO is about?
> >
> > Yeah that is some helper DBrownell added because like me he could
> > never figure out how to pass -DDEBUG to a single file on the command
> > line and besides gpiolib is several files. I added the same to pinctrl
> > to get core debug messages.
> >
> > I guess Bartosz means extra_checks is == a non-standard DEBUG
> > define.

I agree on this statement.

> Defining DEBUG makes sense to
> enable dev_dbg() messages.

Exactly!

> CONFIG_DEBUG_GPIO is used by one driver

By all drivers which are using pr_debug() / dev_dbg().
I am using it a lot in my development process (actually I have it enabled
in all my kernel configurations).

> to enable code that can lead to undefined behavior (should it maybe be
> #if 0?).

I don't know what you are talking about here.

-- 
With Best Regards,
Andy Shevchenko