linux-kernel - Re: [PATCH] gpio: tegra: fix debugfs compile error

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Date:   Mon, 8 Jul 2019 16:06:26 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     linux-gpio@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: tegra: fix debugfs compile error

08.07.2019 15:38, Arnd Bergmann пишет:
> Without this header, some configurations now run into a build failure:
> 
> drivers/gpio/gpio-tegra.c:665:2: error: implicit declaration of function 'debugfs_create_file'
>       [-Werror,-Wimplicit-function-declaration]
>         debugfs_create_file("tegra_gpio", 0444, NULL, tgi,
>         ^
> drivers/gpio/gpio-tegra.c:665:2: error: this function declaration is not a prototype [-Werror,-Wstrict-prototypes]
> drivers/gpio/gpio-tegra.c:666:9: error: use of undeclared identifier 'tegra_dbg_gpio_fops'
> 
> Remove the #ifdef here and let the compiler drop the unused
> functions itself when debugfs_create_file() is an empty inline
> function.
> 
> Fixes: a4de43049a1d ("gpio: tegra: Clean-up debugfs initialisation")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/gpio/gpio-tegra.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
> index 59b99d8c3647..dbcecbe5f52f 100644
> --- a/drivers/gpio/gpio-tegra.c
> +++ b/drivers/gpio/gpio-tegra.c
> @@ -9,6 +9,7 @@
>   *	Erik Gilling <konkers@...gle.com>
>   */
>  
> +#include <linux/debugfs.h>
>  #include <linux/err.h>
>  #include <linux/init.h>
>  #include <linux/irq.h>
> @@ -22,6 +23,7 @@
>  #include <linux/irqchip/chained_irq.h>
>  #include <linux/pinctrl/consumer.h>
>  #include <linux/pm.h>
> +#include <linux/seq_file.h>
>  
>  #define GPIO_BANK(x)		((x) >> 5)
>  #define GPIO_PORT(x)		(((x) >> 3) & 0x3)
> @@ -508,10 +510,6 @@ static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
>  }
>  #endif
>  
> -#ifdef CONFIG_DEBUG_FS
> -
> -#include <linux/debugfs.h>
> -#include <linux/seq_file.h>
>  
>  static int tegra_dbg_gpio_show(struct seq_file *s, void *unused)
>  {
> @@ -538,7 +536,6 @@ static int tegra_dbg_gpio_show(struct seq_file *s, void *unused)
>  }
>  
>  DEFINE_SHOW_ATTRIBUTE(tegra_dbg_gpio);
> -#endif
>  
>  static const struct dev_pm_ops tegra_gpio_pm_ops = {
>  	SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
> 

The offending patch should be reverted already, please see [1].

[1] https://patchwork.ozlabs.org/patch/1128007/#2210871