netdev - Re: [PATCH iproute-next v4 2/3] lib: Introduce ppp protocols

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Date:   Fri, 29 Jul 2022 11:21:22 -0600
From:   David Ahern <dsahern@...il.com>
To:     Guillaume Nault <gnault@...hat.com>
Cc:     Wojciech Drewek <wojciech.drewek@...el.com>,
        netdev@...r.kernel.org, stephen@...workplumber.org
Subject: Re: [PATCH iproute-next v4 2/3] lib: Introduce ppp protocols

On 7/29/22 10:03 AM, Guillaume Nault wrote:
> On Fri, Jul 29, 2022 at 08:58:07AM -0600, David Ahern wrote:
>> On 7/29/22 2:50 AM, Wojciech Drewek wrote:
>>> PPP protocol field uses different values than ethertype. Introduce
>>> utilities for translating PPP protocols from strings to values
>>> and vice versa. Use generic API from utils in order to get
>>> proto id and name.
>>>
>>> Signed-off-by: Wojciech Drewek <wojciech.drewek@...el.com>
>>> ---
>>> v4: ppp_defs.h removed
>>> ---
>>>  include/rt_names.h |  3 +++
>>>  lib/Makefile       |  2 +-
>>>  lib/ppp_proto.c    | 52 ++++++++++++++++++++++++++++++++++++++++++++++
>>>  3 files changed, 56 insertions(+), 1 deletion(-)
>>>  create mode 100644 lib/ppp_proto.c
>>>
>>
>> Ubuntu 20.04 with gcc 9.4 and clang 10.0 - both fail the same:
>>
>> $ make
>>
>> lib
>>     CC       ppp_proto.o
>> In file included from ppp_proto.c:9:
>> ../include/uapi/linux/ppp_defs.h:151:5: error: unknown type name
>> ‘__kernel_old_time_t’
>>   151 |     __kernel_old_time_t xmit_idle; /* time since last NP packet
>> sent */
>>       |     ^~~~~~~~~~~~~~~~~~~
>> ../include/uapi/linux/ppp_defs.h:152:5: error: unknown type name
>> ‘__kernel_old_time_t’
>>   152 |     __kernel_old_time_t recv_idle; /* time since last NP packet
>> received */
>>       |     ^~~~~~~~~~~~~~~~~~~
>> make[1]: *** [../config.mk:58: ppp_proto.o] Error 1
>> make: *** [Makefile:77: all] Error 2
> 
> Works for me on Debian 11 (Bullseye), where __kernel_old_time_t is
> defined in /usr/include/asm-generic/posix_types.h (package
> linux-libc-dev).
> 
> I guess the Ubuntu 20.04 failure happens because it's based on
> Linux 5.4, while __kernel_old_time_t was introduced in v5.5 (by
> commit 94c467ddb273 ("y2038: add __kernel_old_timespec and
> __kernel_old_time_t")).
> 
> Not sure how to resolve this. This series doesn't need the
> struct ppp_idle that depends on __kernel_old_time_t.
> 

I can fix this by importing posix_types.h from kernel headers.