linux-kernel - Re: [PATCH v05 27/72] linux/if.h linux/hdlc/ioctl.h: move IFNAMSIZ definition to hdlc/ioctl.h

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Message-ID: <CAH6sp9OGcMbarYZ0ckvGXZXp2NDpAHFYHSn4GA6t43P+tt0vWA@mail.gmail.com>
Date:   Tue, 23 Aug 2016 10:03:13 +0200
From:   Frans Klaver <fransklaver@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Mikko Rapeli <mikko.rapeli@....fi>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        zhangshengju@...s.chinamobile.com
Subject: Re: [PATCH v05 27/72] linux/if.h linux/hdlc/ioctl.h: move IFNAMSIZ
 definition to hdlc/ioctl.h

On Tue, Aug 23, 2016 at 9:05 AM, David Miller <davem@...emloft.net> wrote:
> From: Frans Klaver <fransklaver@...il.com>
> Date: Tue, 23 Aug 2016 09:03:20 +0200
>
>> On Tue, Aug 23, 2016 at 1:30 AM, David Miller <davem@...emloft.net> wrote:
>>> From: Mikko Rapeli <mikko.rapeli@....fi>
>>> Date: Mon, 22 Aug 2016 20:32:44 +0200
>>>
>>>> Fixes userspace compiler error:
>>>>
>>>> error: ‘IFNAMSIZ’ undeclared here (not in a function)
>>>>
>>>> Suggested by Frans Klaver <fransklaver@...il.com> on lkml message
>>>> <20150530195223.GA15645@...ger.home>.
>>>>
>>>> Signed-off-by: Mikko Rapeli <mikko.rapeli@....fi>
>>>
>>> IFNAMSIZ has to be in linux/if.h, you aren't explaining why you have
>>> to move it to the hdlc header instead of having the hdlc header
>>> include linux/if.h
>>
>> Circular references. linux/if.h includes hdlc/ioctl.h, and has to
>> define IFNAMSIZ before doing so.
>
> That's not acceptable.  Use forward declarations or similar to avoid
> the circular dependency.
>
> IFNAMSIZ belongs in linux/if.h, please keep it there.

I went back to one of the previous patch sets, but couldn't find why
the circular dependency had to be broken. So if this can be fixed by
including linux/if.h instead, I'm all for it.