linux-kernel - Re: [PATCH] gpio: Drop CONFIG_DEBUG

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Date:   Tue, 22 Mar 2022 14:14:13 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Jianqun Xu <jay.xu@...k-chips.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: Drop CONFIG_DEBUG_GPIO

Hi Brian,

On Tue, Mar 15, 2022 at 1:19 AM Brian Norris <briannorris@...omium.org> wrote:
> On Mon, Mar 14, 2022 at 3:23 PM Linus Walleij <linus.walleij@...aro.org> wrote:
> > On Mon, Mar 14, 2022 at 4:00 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > > I like it. It's true we don't see many of those DEBUG constructs
> > > anymore nowadays and overhead for might_sleep() and WARN_ON() is
> > > negligible.
> >
> > I agree.  I have something similar for pinctrl, maybe that needs to
> > go too.
>
> Huh, yeah, CONFIG_DEBUG_PINCTRL does look awfully similar, and I just
> didn't notice because we don't happen to have it enabled for Chromium
> kernels. We happen to have CONFIG_DEBUG_GPIO enabled though, and the
> "new" rockchip-gpio log messages triggered me :)
>
> I guess one difference is that CONFIG_DEBUG_PINCTRL is almost
> exclusively (aside from some renesas drivers?) about extra logging and
> less about interesting checks that one might want to enable in more
> general settings. So it's a clearer call to make that people generally
> want it disabled.

For the Renesas pinctrl drivers, it enables sanity checks on the pin
control tables, which you definitely do not want in your production
kernel.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds