netdev - Re: linux/atm_zatm.h not really usable in userspace since cf00713a655d3019be7faa184402f16c43a0fed3

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Message-ID: <CA+CX+bjXHVdoMzpKWX9jbBWbPhExq2CMnN+BgwhOOG2PBAfWBQ@mail.gmail.com>
Date:   Sat, 15 Oct 2016 15:33:22 +0100
From:   Pascal Terjan <pterjan@...il.com>
To:     Mikko Rapeli <mikko.rapeli@....fi>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: linux/atm_zatm.h not really usable in userspace since cf00713a655d3019be7faa184402f16c43a0fed3

On 15 October 2016 at 15:09, Mikko Rapeli <mikko.rapeli@....fi> wrote:
> On Sat, Oct 15, 2016 at 01:05:10PM +0100, Pascal Terjan wrote:
>> It is no longer possible to include <linux/atm_zatm.h> + userspace
>> headers using time, for example  <stdlib.h>, this broke for example
>> the build of linux-atm.
>>
>> Reproducer:
>>
>> $ cat test.c
>> #include <linux/atm_zatm.h>
>> #include <stdlib.h>
>
> If possible, please reverse the order of includes to first include glibc
> headers and then Linux kernel uapi ones.

That was what I tried first but this didn't help:

In file included from /usr/include/linux/atm_zatm.h:17:0,
                 from test.c:2:
/usr/include/linux/time.h:9:8: error: redefinition of 'struct timespec'
 struct timespec {
        ^
In file included from /usr/include/sys/select.h:43:0,
                 from /usr/include/sys/types.h:219,
                 from /usr/include/stdlib.h:314,
                 from test.c:1:
/usr/include/time.h:120:8: note: originally defined here
 struct timespec
        ^
In file included from /usr/include/linux/atm_zatm.h:17:0,
                 from test.c:2:
/usr/include/linux/time.h:15:8: error: redefinition of 'struct timeval'
 struct timeval {
        ^
In file included from /usr/include/sys/select.h:45:0,
                 from /usr/include/sys/types.h:219,
                 from /usr/include/stdlib.h:314,
                 from test.c:1:
/usr/include/bits/time.h:30:8: note: originally defined here
 struct timeval
        ^
> Kernel uapi headers did not declare their header file dependencies correctly
> and I've been fixing them. I have also tried to fix compatibility issues
> with glibc headers, but unfortunately they only work when glibc headers
> are included before kernel headers. Userspace which has been relying on
> the magic include order for various uapi headers is now unfortunately
> affected. Sorry about that.

In this case no order works, it seems the kernel doesn't handle it in
time.h unlike many other headers