linux-kernel - Re: [PATCH linux-next] scripts/dtc: Replace zero-length array with DECLARE_FLEX

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Message-ID: <Y3LoNLVzdYPmGU2J@work>
Date:   Mon, 14 Nov 2022 19:15:32 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     guo.ziliang@....com.cn
Cc:     robh+dt@...nel.org, frowand.list@...il.com, keescook@...omium.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH linux-next] scripts/dtc: Replace zero-length array with
 DECLARE_FLEX_ARRAY() helper

On Tue, Nov 15, 2022 at 09:03:27AM +0800, guo.ziliang@....com.cn wrote:
> From: guo ziliang <guo.ziliang@....com.cn>
> 
> Zero-length arrays are deprecated and we are moving towards adopting
> C99 flexible-array members, instead. So, replace zero-length arrays
> declarations in anonymous union with the new DECLARE_FLEX_ARRAY()
> helper macro.
> 
> Signed-off-by: guo ziliang <guo.ziliang@....com.cn>
> ---
>  scripts/dtc/libfdt/fdt.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/dtc/libfdt/fdt.h b/scripts/dtc/libfdt/fdt.h
> index f2e6880..f66fff1 100644
> --- a/scripts/dtc/libfdt/fdt.h
> +++ b/scripts/dtc/libfdt/fdt.h
> @@ -35,14 +35,14 @@ struct fdt_reserve_entry {
> 
>  struct fdt_node_header {
>         fdt32_t tag;
> -       char name[0];
> +       DECLARE_FLEX_ARRAY(char, name);
>  };
> 
>  struct fdt_property {
>         fdt32_t tag;
>         fdt32_t len;
>         fdt32_t nameoff;
> -       char data[0];
> +       DECLARE_FLEX_ARRAY(char, data);
>  };

This was addressed in commit:

        5224f7909617 ("treewide: Replace zero-length arrays with flexible-array members")

My question here is why these changes were reverted by commit:

        ea3723a541c1 ("scripts/dtc: Update to upstream version v1.6.1-63-g55778a03df61")

?? :O

Thanks
--
Gustavo