Re: [PATCH] m68k/atari: Avoid VLA use in atari_switches_setup()

[Geert Uytterhoeven]

Hi Arnd,

On Tue, Jan 8, 2019 at 2:25 PM Arnd Bergmann <arnd@xxxxxxxx> wrote:
> On Mon, Jan 7, 2019 at 10:29 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> > With gcc 7.3.0:
> >
> >     arch/m68k/atari/config.c: In function âatari_switches_setupâ:
> >     arch/m68k/atari/config.c:151:2: warning: ISO C90 forbids variable length array âswitchesâ [-Wvla]
> >       char switches[strlen(str) + 1];
> >       ^~~~
> >
> > Replace the variable size by the maximum kernel command line size (512
> > bytes), which is an upper limit for all suboptions.
> >
> > Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
>
> Seems fine as long as COMMAND_LINE_SIZE never grows a lot. Some

If that ever happens, it will be caught by -Wframe-larger-than=1024.

> architectures use 1024 or 2048, but m68k currently has 256 (you write
> 512 here).

Thanks for noticing, will fix!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds