linux-kernel - Re: [PATCH net-next] tcp: Fix tcp_syn_flood_action() if CONFIG

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Date:   Fri, 18 Nov 2022 08:19:06 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jamie Bainbridge <jamie.bainbridge@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Chris Down <chris@...isdown.name>,
        Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: Fix tcp_syn_flood_action() if
 CONFIG_IPV6=n

On Fri, 18 Nov 2022 09:29:13 +0100 Geert Uytterhoeven wrote:
> IMHO this is worse, as the #ifdef/#endif is spread across the two branches
> of an if-conditional.
> 
> Hence this is usually written as:
> 
>             if (cond1) {
>                     expensive_call1();
>             }
>     #ifdef cond2_enabled
>            else {
>                     expensive_call1();
>             }
>     #endif

Alright, good enough for me.