Re: [PATCH 3/4] gpio: Remove VLA from xra1403 driver

[Laura Abbott]

On 03/28/2018 12:27 AM, Geert Uytterhoeven wrote:
> Hi Laura,
>
> On Sat, Mar 10, 2018 at 1:10 AM, Laura Abbott <labbott@xxxxxxxxxx> wrote:
> > The new challenge is to remove VLAs from the kernel
> > (see https://lkml.org/lkml/2018/3/7/621)
> >
> > This patch replaces a VLA with an appropriate call to kmalloc_array.
> >
> > Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
>
> Thanks for your patch!
>
> > --- a/drivers/gpio/gpio-xra1403.c
> > +++ b/drivers/gpio/gpio-xra1403.c
> > @@ -126,11 +126,16 @@ static void xra1403_dbg_show(struct seq_file *s, struct gpio_chip *chip)
> >   {
> >          int reg;
> >          struct xra1403 *xra = gpiochip_get_data(chip);
> > -       int value[xra1403_regmap_cfg.max_register];
>
> Apparently xra1403_regmap_cfg.max_register is always 0x15?
>
> What about adding
>
>          #define XRA_LAST 15
>
> at the top, and replacing both "XRA_IFR | 0x01" and
> xra1403_regmap_cfg.max_register by XRA_LAST instead?
> That would avoid doing yet another memory allocation over and over.
>
> Gr{oetje,eeting}s,
>
>                          Geert

I'm okay with making the change but I think Linus already picked
up the patch into his gpio trees. Linus, do you want a patch on
top of your -devel branch or should I just send a new patch?

Thanks,
Laura