linux-kernel - Re: [PATCH] gpiolib: demote the hogging log messages to debug

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Message-ID: <CAMRc=MfD1Ju-QCZbr87nP987RMSDko=t1R2cXGmSjdJhdPR5hw@mail.gmail.com>
Date:   Fri, 9 Jun 2023 16:20:36 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Kent Gibson <warthog618@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH] gpiolib: demote the hogging log messages to debug

On Fri, Jun 9, 2023 at 3:47 PM Rob Herring <robh+dt@...nel.org> wrote:
>
> On Mon, Jun 5, 2023 at 6:53 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> >
> > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> >
> > Drivers should be silent when they work correctly. There's no reason to
> > emit info messages when GPIO lines are hogged. Demote the message to
> > debug.
> >
> > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > Suggested-by: Kent Gibson <warthog618@...il.com>
> > ---
> >  drivers/gpio/gpiolib.c |  2 +-
> >  drivers/of/unittest.c  | 16 ++++++++--------
> >  2 files changed, 9 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> > index a7220e04a93e..e4515bda8915 100644
> > --- a/drivers/gpio/gpiolib.c
> > +++ b/drivers/gpio/gpiolib.c
> > @@ -4243,7 +4243,7 @@ int gpiod_hog(struct gpio_desc *desc, const char *name,
> >         /* Mark GPIO as hogged so it can be identified and removed later */
> >         set_bit(FLAG_IS_HOGGED, &desc->flags);
> >
> > -       gpiod_info(desc, "hogged as %s%s\n",
> > +       gpiod_dbg(desc, "hogged as %s%s\n",
> >                 (dflags & GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input",
> >                 (dflags & GPIOD_FLAGS_BIT_DIR_OUT) ?
> >                   (dflags & GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low" : "");
> > diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
> > index 2191c0136531..0060334a98a7 100644
> > --- a/drivers/of/unittest.c
> > +++ b/drivers/of/unittest.c
> > @@ -1849,19 +1849,19 @@ static void __init of_unittest_overlay_gpio(void)
> >          * driver is registered
> >          */
> >
> > -       EXPECT_BEGIN(KERN_INFO,
> > +       EXPECT_BEGIN(KERN_DEBUG,
> >                      "gpio-<<int>> (line-B-input): hogged as input\n");
>
> As debug messages are normally off, I think you can just remove these.
>
> Rob

I will send a follow-up.

Bart