linux-kernel - Re: [PATCHv4] gpio: Remove VLA from gpiolib

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Message-ID: <20180411150300.GA32719@wunner.de>
Date:   Wed, 11 Apr 2018 17:03:00 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Kees Cook <keescook@...omium.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCHv4] gpio: Remove VLA from gpiolib

On Tue, Apr 10, 2018 at 06:03:52PM -0700, Laura Abbott wrote:
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -61,6 +61,11 @@ static struct bus_type gpio_bus_type = {
>  	.name = "gpio",
>  };
>  
> +/*
> + * Number of GPIOs to use for the fast path in set array
> + */
> +#define FASTPATH_NGPIO 256

Hm, this has regressed from 384 back to 256 since v3.


> @@ -2653,6 +2661,7 @@ static int gpio_chip_get_multiple(struct gpio_chip *chip,
>  	return -EIO;
>  }
>  
> +
>  int gpiod_get_array_value_complex(bool raw, bool can_sleep,

Spurious newline.  (In v3 this was the place where FASTPATH_NGPIO was
defined, this is a leftover from when you moved it further up.)

I've given this another quick test with gpio-hammer and it worked fine,
so this is still
Reviewed-and-tested-by: Lukas Wunner <lukas@...ner.de>

Thanks a lot!

Lukas