Hello Linus,
On Wed, Dec 09, 2015 at 02:18:37PM +0100, Linus Walleij wrote:
> This makes the driver use the data pointer added to the gpio_chip
> to store a pointer to the state container instead of relying on
> container_of().
I wonder why your patch is an improvement. I imagine that container_of
is cheaper in instructions and memory/cache accesses.
> static void mpc8xxx_gpio_save_regs(struct of_mm_gpio_chip *mm)
> {
> - struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
> + struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(&mm->gc);
>
> mpc8xxx_gc->data = in_be32(mm->regs + GPIO_DAT);
> }
Also for my (subjective) eye the above change doesn't make the
assignment more readable.
So can you please expand your commit log (or rethink the patch)?
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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