linux-kernel - Re: [PATCH resend] gpiolib: Let gpiod_add_lookup_table() call gpiod_add_lookup

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Message-ID: <CAMRc=Mf2me=Jv=kM6nkNwPVjYzKg-xWxXtiRRju12OM1nSqpfw@mail.gmail.com>
Date:   Fri, 3 Dec 2021 15:51:38 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH resend] gpiolib: Let gpiod_add_lookup_table() call gpiod_add_lookup_tables()

On Fri, Dec 3, 2021 at 2:48 PM Geert Uytterhoeven
<geert+renesas@...der.be> wrote:
>
> This saves 20 bytes on arm32, and 44 bytes on arm64.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> Interestingly, making gpiod_add_lookup_table() a static inline function
> in <linux/gpio/machine.h> instead would increase the caller's code size
> by 68 bytes on arm32...
> ---
>  drivers/gpio/gpiolib.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index abfbf546d1599ebc..85168f88a7fec774 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -3487,11 +3487,7 @@ EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
>   */
>  void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
>  {
> -       mutex_lock(&gpio_lookup_lock);
> -
> -       list_add_tail(&table->list, &gpio_lookup_list);
> -
> -       mutex_unlock(&gpio_lookup_lock);
> +       gpiod_add_lookup_tables(&table, 1);
>  }
>  EXPORT_SYMBOL_GPL(gpiod_add_lookup_table);
>
> --
> 2.25.1
>

Applied, thanks!

Bart