linux-kernel - Re: [PATCH] gpiolib: fix linker errors when GPIOLIB is disabled

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Message-ID: <AM6PR08MB437640AB4B959DD356162F2BFFC69@AM6PR08MB4376.eurprd08.prod.outlook.com>
Date:   Tue, 17 Jan 2023 10:17:49 +0000
From:   Pierluigi Passaro <pierluigi.p@...iscite.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
CC:     "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Eran Matityahu <eran.m@...iscite.com>,
        Nate Drude <Nate.D@...iscite.com>,
        Francesco Ferraro <francesco.f@...iscite.com>,
        "pierluigi.passaro@...il.com" <pierluigi.passaro@...il.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] gpiolib: fix linker errors when GPIOLIB is disabled

On Tue, Jan 17, 2023 at 10:36 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> On Mon, Jan 16, 2023 at 3:08 PM Pierluigi Passaro
> <pierluigi.p@...iscite.com> wrote:
> >
> > Both the functions gpiochip_request_own_desc and
> > gpiochip_free_own_desc are exported from
> >     drivers/gpio/gpiolib.c
> > but this file is compiled only when CONFIG_GPIOLIB is enabled.
> > Move the protototypes under "#ifdef CONFIG_GPIOLIB" and provide
> > reasonable definitions in the "#else" branch.
> >
> > Signed-off-by: Pierluigi Passaro <pierluigi.p@...iscite.com>
> > Reported-by: kernel test robot <lkp@...el.com>
>
> Please add a Fixes tag.
>
I beg your pardon for the question: how can I "add a Fixes tag" ?
Can you point me to any reference documentation / instructions ?
Thanks
>
> Bart
>
> > ---
> >  include/linux/gpio/driver.h | 20 ++++++++++++++++++--
> >  1 file changed, 18 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
> > index 44783fc16125..ed77c6fc0beb 100644
> > --- a/include/linux/gpio/driver.h
> > +++ b/include/linux/gpio/driver.h
> > @@ -758,6 +758,8 @@ gpiochip_remove_pin_ranges(struct gpio_chip *gc)
> >
> >  #endif /* CONFIG_PINCTRL */
> >
> > +#ifdef CONFIG_GPIOLIB
> > +
> >  struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
> >                                             unsigned int hwnum,
> >                                             const char *label,
> > @@ -765,8 +767,6 @@ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
> >                                             enum gpiod_flags dflags);
> >  void gpiochip_free_own_desc(struct gpio_desc *desc);
> >
> > -#ifdef CONFIG_GPIOLIB
> > -
> >  /* lock/unlock as IRQ */
> >  int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset);
> >  void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset);
> > @@ -776,6 +776,22 @@ struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
> >
> >  #else /* CONFIG_GPIOLIB */
> >
> > +static inline struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
> > +                                           unsigned int hwnum,
> > +                                           const char *label,
> > +                                           enum gpio_lookup_flags lflags,
> > +                                           enum gpiod_flags dflags)
> > +{
> > +       /* GPIO can never have been requested */
> > +       WARN_ON(1);
> > +       return ERR_PTR(-ENODEV);
> > +}
> > +
> > +static inline void gpiochip_free_own_desc(struct gpio_desc *desc)
> > +{
> > +       WARN_ON(1);
> > +}
> > +
> >  static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
> >  {
> >         /* GPIO can never have been requested */
> > --
> > 2.37.2
> >