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

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Date:   Fri, 10 Jun 2022 11:00:28 -0700 (PDT)
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     Jakub Kicinski <kuba@...nel.org>
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 Thu, 9 Jun 2022, Jakub Kicinski wrote:

> 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.
>

Hi Jakub -

This is a minor "fix" to be sure, which I thought did not meet the bar for 
net and therefore submitted for net-next. It's not prep for another 
change, it's something Ossama and I noticed when doing code review for a 
userspace program that included the header. There's no problem with kernel 
compilation, and there's also no issue if the userspace program happens to 
include netinet/in.h before linux/mptcp.h


If my threshold for the net branch is too high, I have no objection to 
having this patch applied there and will recalibrate :)

Do you prefer to have no Fixes: tags in net-next, or did that just seem 
ambiguous in this case?

--
Mat Martineau
Intel