linux-kernel - Re: [PATCH] gpio: gpiolib: make gpio_bus

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Date: Mon, 5 Feb 2024 04:43:49 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: "Ricardo B. Marliere" <ricardo@...liere.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: gpiolib: make gpio_bus_type const

On Sun, Feb 04, 2024 at 07:34:43PM +0100, Bartosz Golaszewski wrote:
> On Sun, Feb 4, 2024 at 5:29 PM Ricardo B. Marliere <ricardo@...liere.net> wrote:
> >
> > Now that the driver core can properly handle constant struct bus_type,
> > move the gpio_bus_type variable to be a constant structure as well,
> > placing it into read-only memory which can not be modified at runtime.
> >
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
> > ---
> >  drivers/gpio/gpiolib.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> > index d50a786f8176..24d046268a01 100644
> > --- a/drivers/gpio/gpiolib.c
> > +++ b/drivers/gpio/gpiolib.c
> > @@ -63,7 +63,7 @@ static int gpio_bus_match(struct device *dev, struct device_driver *drv)
> >         return 1;
> >  }
> >
> > -static struct bus_type gpio_bus_type = {
> > +static const struct bus_type gpio_bus_type = {
> >         .name = "gpio",
> >         .match = gpio_bus_match,
> >  };
> >
> > ---
> > base-commit: 3eac8bbed22e940ac1645a884f221bef408f675c
> > change-id: 20240204-bus_cleanup-gpio-57eea8d32a5a
> >
> > Best regards,
> > --
> > Ricardo B. Marliere <ricardo@...liere.net>
> >
> 
> Ha! Does the same work now for struct device_type?

Very much so, please feel free to do so, that's next on my list of
things to do for the tree.

greg k-h