netdev - Re: [PATCH net-next 1/2] mptcp: fix conflict with <netinet/in.h>

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Message-ID: <20220609225936.4cba4860@kernel.org>
Date:   Thu, 9 Jun 2022 22:59:36 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Mat Martineau <mathew.j.martineau@...ux.intel.com>
Cc:     netdev@...r.kernel.org, Ossama Othman <ossama.othman@...el.com>,
        davem@...emloft.net, pabeni@...hat.com, edumazet@...gle.com,
        matthieu.baerts@...sares.net, mptcp@...ts.linux.dev
Subject: Re: [PATCH net-next 1/2] mptcp: fix conflict with <netinet/in.h>

On Wed,  8 Jun 2022 12:19:18 -0700 Mat Martineau wrote:
> From: Ossama Othman <ossama.othman@...el.com>
> 
> Including <linux/mptcp.h> before the C library <netinet/in.h> header
> causes symbol redefinition errors at compile-time due to duplicate
> declarations and definitions in the <linux/in.h> header included by
> <linux/mptcp.h>.
> 
> Explicitly include <netinet/in.h> before <linux/in.h> in
> <linux/mptcp.h> when __KERNEL__ is not defined so that the C library
> compatibility logic in <linux/libc-compat.h> is enabled when including
> <linux/mptcp.h> in user space code.
> 
> Fixes: c11c5906bc0a ("mptcp: add MPTCP_SUBFLOW_ADDRS getsockopt support")

What does it break, tho? The commit under Fixes is in net, if it's
really a fix it needs to go to net. If it's just prep for another
change we don't need to fixes tag.