linux-kernel - Re: [PATCH] vt: use flexible-array member instead of zero-length array

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Message-ID: <X+3l1pv89pBW/tKN@kroah.com>
Date:   Thu, 31 Dec 2020 15:53:10 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Tian Tao <tiantao6@...ilicon.com>
Cc:     jirislaby@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vt: use flexible-array member instead of zero-length
 array

On Thu, Dec 31, 2020 at 08:04:00PM +0800, Tian Tao wrote:
> Use flexible-array member introduced in C99 instead of zero-length
> array. Most of zero-length array was already taken care in previous
> patch [1]. Now modified few more cases which were not handled earlier.
> 
> [1]. https://patchwork.kernel.org/patch/11394197/
> 
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> ---
>  drivers/tty/vt/vt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
> index d04a162..86b4c5f 100644
> --- a/drivers/tty/vt/vt.c
> +++ b/drivers/tty/vt/vt.c
> @@ -332,7 +332,7 @@ typedef uint32_t char32_t;
>   * scrolling only implies some pointer shuffling.
>   */
>  struct uni_screen {
> -	char32_t *lines[0];
> +	char32_t *lines[];

Are you _sure_ you can do this?  What testing did you do?

thanks,

greg k-h