linux-kernel - Re: [PATCH v2] uapi/netfilter: Prefer ISO-friendly __typeof_

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Date:   Thu, 4 May 2023 12:02:17 +0200
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Petr Vorel <pvorel@...e.cz>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>, sam@...nborg.org,
        Ruben Ayrapetyan <ruben.ayrapetyan@....com>,
        Kevin Brodsky <kevin.brodsky@....com>
Subject: Re: [PATCH v2] uapi/netfilter: Prefer ISO-friendly __typeof__

On Thu, May 4, 2023 at 10:36 AM Petr Vorel <pvorel@...e.cz> wrote:
>
> typeof() is a GNU extension, UAPI requires ISO C, therefore __typeof__()
> should be used.  Similarly to 31088f6f7906 ("uapi/linux/const.h: Prefer
> ISO-friendly __typeof__") use __typeof__() also in x_tables.h.
>
> Fixes: 72b2b1dd77e8 ("netfilter: xtables: replace XT_ENTRY_ITERATE macro")
> Reviewed-by: Kevin Brodsky <kevin.brodsky@....com>
> Signed-off-by: Petr Vorel <pvorel@...e.cz>


Reviewed-by: Masahiro Yamada <masahiroy@...nel.org>




> ---
> Changes v1->v2:
> * Add Kevin's Reviewed-by:
>   https://lore.kernel.org/lkml/f8bd4212-9cca-03ca-884a-c9dec63bb256@arm.com/
> * Update hash to 31088f6f7906 (Kevin)
> * Add Fixes: 72b2b1dd77e8 (Kevin)
>
>  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) + \
> --
> 2.40.0
>


-- 
Best Regards
Masahiro Yamada