From: Jakub Kicinski <kuba@kernel.org>
To: Jamie Bainbridge <jamie.bainbridge@gmail.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>,
Eric Dumazet <edumazet@google.com>,
"David S . Miller" <davem@davemloft.net>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
David Ahern <dsahern@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Chris Down <chris@chrisdown.name>,
Stephen Hemminger <stephen@networkplumber.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next] tcp: Fix tcp_syn_flood_action() if CONFIG_IPV6=n
Date: Wed, 16 Nov 2022 14:15:19 -0800 [thread overview]
Message-ID: <20221116141519.0ef42fa2@kernel.org> (raw)
In-Reply-To: <CAAvyFNhbsks96=yyWHDCi-u+A1vaEy845_+pytghAscoG0rrTQ@mail.gmail.com>
On Thu, 17 Nov 2022 08:39:43 +1100 Jamie Bainbridge wrote:
> > if (v6) {
> > #ifdef v6
> > expensive_call6();
> > #endif
> > } else {
> > expensive_call6();
> > }
>
> These should work, but I expect they cause a comparison which can't be
> optimised out at compile time. This is probably why the first style
> exists.
>
> In this SYN flood codepath optimisation doesn't matter because we're
> doing ratelimited logging anyway. But if we're breaking with existing
> style, then wouldn't the others also have to change to this style? I
> haven't reviewed all the other usage to tell if they're in an oft-used
> fastpath where such a thing might matter.
I think the word style already implies subjectivity.
next prev parent reply other threads:[~2022-11-16 22:15 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-15 10:12 [PATCH net-next] tcp: Fix tcp_syn_flood_action() if CONFIG_IPV6=n Geert Uytterhoeven
2022-11-15 11:37 ` Matthieu Baerts
2022-11-16 20:31 ` Jakub Kicinski
2022-11-16 21:39 ` Jamie Bainbridge
2022-11-16 22:15 ` Jakub Kicinski [this message]
2022-11-18 1:45 ` Jamie Bainbridge
2022-11-18 8:29 ` Geert Uytterhoeven
2022-11-18 16:19 ` Jakub Kicinski
2022-11-21 22:44 ` Saeed Mahameed
2022-11-22 3:52 ` Jakub Kicinski
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