netdev - Re: [PATCH net] udp: Remove an unnecessary variable in udp[46]_lib

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Date:   Fri, 24 Jul 2020 15:13:04 +0900
From:   Kuniyuki Iwashima <kuniyu@...zon.co.jp>
To:     <davem@...emloft.net>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <jakub@...udflare.com>,
        <kuba@...nel.org>, <kuni1840@...il.com>, <kuniyu@...zon.co.jp>,
        <netdev@...r.kernel.org>, <willemb@...gle.com>,
        <willemdebruijn.kernel@...il.com>
Subject: Re: [PATCH net] udp: Remove an unnecessary variable in udp[46]_lib_lookup2().

From:   David Miller <davem@...emloft.net>
Date:   Thu, 23 Jul 2020 15:10:51 -0700 (PDT)
> From: Kuniyuki Iwashima <kuniyu@...zon.co.jp>
> Date: Thu, 23 Jul 2020 01:52:27 +0900
> 
> > This patch removes an unnecessary variable in udp[46]_lib_lookup2() and
> > makes it easier to resolve a merge conflict with bpf-next reported in
> > the link below.
> > 
> > Link: https://lore.kernel.org/linux-next/20200722132143.700a5ccc@canb.auug.org.au/
> > Fixes: efc6b6f6c311 ("udp: Improve load balancing for SO_REUSEPORT.")
> > Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.co.jp>
> > Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> > Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>
> 
> This doesn't apply to net-next.

Yes. I think this kind of patch should be submitted to net-next, but this
is for the net tree. Please let me add more description.

Currently, the net and net-next trees conflict in udp[46]_lib_lookup2()
between

   efc6b6f6c311 ("udp: Improve load balancing for SO_REUSEPORT.")

and

   7629c73a1466 ("udp: Extract helper for selecting socket from reuseport group")
   2a08748cd384 ("udp6: Extract helper for selecting socket from reuseport group")
.

The conflict is reported in the link[0] and Jakub suggested how to resolve
it[1]. To ease the merge conflict, Jakub and I have to send follow up patches to
the bpf-next and net trees.

Now, his patchset (7629c73a1466 and 2a08748cd384) to bpf-next is merged
into net-next, and his follow up patch is applied in bpf-next[2].

I fixed a bug in efc6b6f6c311, but it introduced an unnecessary variable
and made the conflict worse. So I sent this follow up patch to net tree.

However, I do not know the best way to resolve the conflict, so any comments
are welcome.

[0] https://lore.kernel.org/linux-next/20200722132143.700a5ccc@canb.auug.org.au/
[1] https://lore.kernel.org/linux-next/87wo2vwxq6.fsf@cloudflare.com/
[2] https://lore.kernel.org/netdev/20200722165902.51857-1-kuniyu@amazon.co.jp/T/#t

Best Regards,
Kuniyuki