linux-kernel - Re: [PATCH] uapi/netfilter: Prefer ISO-friendly __typeof_

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Date:   Mon, 24 Apr 2023 17:47:45 +0200
From:   Kevin Brodsky <kevin.brodsky@....com>
To:     Petr Vorel <pvorel@...e.cz>, linux-kernel@...r.kernel.org
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Ruben Ayrapetyan <ruben.ayrapetyan@....com>,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] uapi/netfilter: Prefer ISO-friendly __typeof__

On 16/04/2023 23:07, Petr Vorel wrote:
> typeof() is a GNU extension, UAPI requires ISO C, therefore __typeof__()
> should be used.  Similarly to b4bd35a19df5 ("uapi/linux/const.h: Prefer
> ISO-friendly __typeof__") use __typeof__() also in x_tables.h.

Thanks for finishing up the work!

Minor thing, the hash for my commit in -next seems to be 31088f6f7906 at
the moment. As to the Fixes: tag, it looks like it should be (assuming
that commit already exported the macro):

Fixes: 72b2b1dd77e8 ("netfilter: xtables: replace XT_ENTRY_ITERATE macro")

Aside from that, looks good to me, so:

Reviewed-by: Kevin Brodsky <kevin.brodsky@....com>

Kevin

> Signed-off-by: Petr Vorel <pvorel@...e.cz>
> ---
> Based on [1] merged into linux-next as b4bd35a19df5.
> There should be the same Fixes: which we agree in discussion in [1]
> (likely a79ff731a1b2, or d6fc9fcbaa65).
>
> Kind regards,
> Petr
>
> [1] https://lore.kernel.org/lkml/20230411092747.3759032-1-kevin.brodsky@arm.com/
>
>
>  include/uapi/linux/netfilter/x_tables.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/include/uapi/linux/netfilter/x_tables.h b/include/uapi/linux/netfilter/x_tables.h
> index 796af83a963a..d4eced07f2a2 100644
> --- a/include/uapi/linux/netfilter/x_tables.h
> +++ b/include/uapi/linux/netfilter/x_tables.h
> @@ -172,11 +172,11 @@ struct xt_counters_info {
>  
>  /* pos is normally a struct ipt_entry/ip6t_entry/etc. */
>  #define xt_entry_foreach(pos, ehead, esize) \
> -	for ((pos) = (typeof(pos))(ehead); \
> -	     (pos) < (typeof(pos))((char *)(ehead) + (esize)); \
> -	     (pos) = (typeof(pos))((char *)(pos) + (pos)->next_offset))
> +	for ((pos) = (__typeof__(pos))(ehead); \
> +	     (pos) < (__typeof__(pos))((char *)(ehead) + (esize)); \
> +	     (pos) = (__typeof__(pos))((char *)(pos) + (pos)->next_offset))
>  
> -/* can only be xt_entry_match, so no use of typeof here */
> +/* can only be xt_entry_match, so no use of __typeof__ here */
>  #define xt_ematch_foreach(pos, entry) \
>  	for ((pos) = (struct xt_entry_match *)entry->elems; \
>  	     (pos) < (struct xt_entry_match *)((char *)(entry) + \