linux-kernel - Re: [PATCH v4 71/79] include/uapi/linux/fuse.h: use linux/types.h also in userspace

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Message-ID: <CAJfpegtSK-ttDXN+vz+yzsU9P1m7fDCn2VwXfHyJuWL6-O-g3g@mail.gmail.com>
Date:	Thu, 15 Oct 2015 20:32:45 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Mikko Rapeli <mikko.rapeli@....fi>
Cc:	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v4 71/79] include/uapi/linux/fuse.h: use linux/types.h
 also in userspace

On Thu, Oct 15, 2015 at 7:41 PM, Mikko Rapeli <mikko.rapeli@....fi> wrote:
> On Thu, Oct 15, 2015 at 05:20:24PM +0200, Miklos Szeredi wrote:
>> On Thu, Oct 15, 2015 at 7:56 AM, Mikko Rapeli <mikko.rapeli@....fi> wrote:
>> > Kernel headers should not use stdint.h.
>>
>> Including <linux/types.h> breaks compile of library on non-Linux
>> archs.  Allowing this patch would mean having a different header in
>> the fuse lib as the one in the kernel.  This is useless complexity and
>> a source of bugs.  We've already been there, and much prefer the
>> current state.
>
> Hmm. Why should Linux uapi header care about non-Linux platforms?
>
> If fuse lib already has an embedded copy of this header, why should
> this change break anything fuse lib?

It has a copy, but that copy is often updated with new features taken
from the kernel.  There's no reason to have two different versions of
the header file for no good reason.

> In my other patches I got review comments that kernel headers should not
> use <stdint.h> and also Documentation/CodingStyle section 5 says:
>
>  (e) Types safe for use in userspace.
>
>      In certain structures which are visible to userspace, we cannot
>      require C99 types and cannot use the 'u32' form above. Thus, we
>      use __u32 and similar types in all structures which are shared
>      with userspace.

Ok, if you cannot require C99, then the __uXX types are the way to go.
But for the fuse API we *can* use C99 types, nothing preventing us
from doing it.

Thanks,
Miklos
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