linux-kernel - Re: [PATCH v3 net-next 0/2] bpfilter

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Date:   Wed, 23 May 2018 19:09:05 -0700
From:   Alexei Starovoitov <ast@...com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Alexei Starovoitov <ast@...nel.org>
CC:     "David S . Miller" <davem@...emloft.net>, <daniel@...earbox.net>,
        <torvalds@...ux-foundation.org>, <gregkh@...uxfoundation.org>,
        <luto@...capital.net>, <mcgrof@...nel.org>,
        <keescook@...omium.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...com>
Subject: Re: [PATCH v3 net-next 0/2] bpfilter

On 5/23/18 6:50 PM, Jakub Kicinski wrote:
> On Wed, 23 May 2018 18:33:52 -0700, Jakub Kicinski wrote:
>> Minor glitch with Ubuntu 18.04:
>>
>> $ gcc --version
>> gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0
>>
>> In file included from /usr/include/fcntl.h:290:0,
>>                  from ../net/bpfilter/main.c:7:
>> In function ‘open’,
>>     inlined from ‘main’ at ../net/bpfilter/main.c:58:13:
>> /usr/include/x86_64-linux-gnu/bits/fcntl2.h:50:4: error: call to ‘__open_missing_mode’ declared with attribute error: open with O_CREAT or O_TMPFILE in second argument needs 3 arguments
>>     __open_missing_mode ();
>>     ^~~~~~~~~~~~~~~~~~~~~~
>> scripts/Makefile.host:107: recipe for target 'net/bpfilter/main.o' failed
>> make[3]: *** [net/bpfilter/main.o] Error 1
>>
>> I can't repro on Fedora 27 gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5),
>> perhaps the GCC is broken on that Ubuntu 18.04 box of mine.  The warning/
>> /error, however, looks potentially legit?
>
> More?
>
> Kernel: arch/x86/boot/bzImage is ready  (#9)
>   Building modules, stage 2.
>   MODPOST 1620 modules
> ERROR: "bpfilter_process_sockopt" [net/bpfilter/bpfilter.ko] undefined!
> ../scripts/Makefile.modpost:92: recipe for target '__modpost' failed

hmm. how come buildbot didn't yell at me for any of these things.
will take a look soon.