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SubjectRe: [PATCH] gpio: of: Build fails if CONFIG_OF_DYNAMIC enabled without CONFIG_OF_GPIO
Hi David,

On Sat, Apr 25, 2020 at 6:47 AM David Gow <davidgow@google.com> wrote:
> The symbol 'gpio_of_notifier' doesn't exist without both CONFIG_OF_GPIO
> and CONFIG_OF_DYNAMIC enabled, but is referenced when only
> CONFIG_OF_DYNAMIC is enabled.
>
> This broke building with 'make ARCH=um allyesconfig':

Right, so you have CONFIG_OF=y, but CONFIG_OF_GPIO=n, as the latter
depends on HAS_IOMEM, which is not set for UML.

Interestingly, the latter dependency claims to have been added because
gpiolib-of.c uses ioremap()/iounmap(). However, it seems to have never
called ioremap(), only of_iomap() and iounmap().
of_iomap() itself is available, as it depends on OF_ADDRESS, which
depends on HAS_IOMEM || UML. Interestingly, of_iomap() calls ioremap(),
without a dependency on HAS_IOMEM?

So perhaps the dependency of CONFIG_OF_GPIO on HAS_IOMEM can be
dropped these days, solving this issue as well?

> ---------------
> /usr/bin/ld: drivers/gpio/gpiolib.o: in function `gpiolib_dev_init':
> ./drivers/gpio/gpiolib.c:5293: undefined reference to `gpio_of_notifier'
> collect2: error: ld returned 1 exit status
> ---------------
>
> Fixes: 63636d956c45 ("gpio: of: Add DT overlay support for GPIO hogs")
> Signed-off-by: David Gow <davidgow@google.com>

Anyway:
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -5289,8 +5289,9 @@ static int __init gpiolib_dev_init(void)
> gpiolib_initialized = true;
> gpiochip_setup_devs();
>
> - if (IS_ENABLED(CONFIG_OF_DYNAMIC))
> - WARN_ON(of_reconfig_notifier_register(&gpio_of_notifier));
> +#if IS_ENABLED(CONFIG_OF_DYNAMIC) && IS_ENABLED(CONFIG_OF_GPIO)
> + WARN_ON(of_reconfig_notifier_register(&gpio_of_notifier));
> +#endif /* CONFIG_OF_DYNAMIC && CONFIG_OF_GPIO */
>
> return ret;
> }

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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
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