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Date:   Fri, 28 Aug 2020 08:12:21 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Sven Joachim <svenjoac@....de>, Brian Vazquez <brianvv@...gle.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the net-next tree

On 8/28/20 8:09 AM, Sven Joachim wrote:
> On 2020-08-27 11:12 -0700, Brian Vazquez wrote:
> 
>> I've been trying to reproduce it with your config but I didn't
>> succeed. I also looked at the file after the preprocessor and it
>> looked good:
>>
>> ret = ({ __builtin_expect(!!(ops->match == fib6_rule_match), 1) ?
>> fib6_rule_match(rule, fl, flags) : ops->match(rule, fl, flags); })
> 
> However, in my configuration I have CONFIG_IPV6=m, and so
> fib6_rule_match is not available as a builtin.  I think that's why ld is
> complaining about the undefined reference.

Same here FWIW. CONFIG_IPV6=m.


> Changing the configuration to CONFIG_IPV6=y helps, FWIW.
> 
>> Note that fib4_rule_match doesn't appear as the
>> CONFIG_IP_MULTIPLE_TABLES is not there.
>>
>> Could you share more details on how you're compiling it and what
>> compiler you're using??
> 
> Tried with both gcc 9 and gcc 10 under Debian unstable, binutils 2.35.
> I usually use "make bindebpkg", but just running "make" is sufficient to
> reproduce the problem, as it happens when linking vmlinux.
> 
> Cheers,
>        Sven
> 
> 
>> On Mon, Aug 24, 2020 at 1:08 AM Sven Joachim <svenjoac@....de> wrote:
>>>
>>> On 2020-08-22 08:16 +0200, Sven Joachim wrote:
>>>
>>>> On 2020-08-21 09:23 -0700, Brian Vazquez wrote:
>>>>
>>>>> Hi Sven,
>>>>>
>>>>> Sorry for the late reply, did you still see this after:
>>>>> https://patchwork.ozlabs.org/project/netdev/patch/20200803131948.41736-1-yuehaibing@huawei.com/
>>>>> ??
>>>>
>>>> That patch is apparently already in 5.9-rc1 as commit 80fbbb1672e7, so
>>>> yes I'm still seeing it.
>>>
>>> Still present in 5.9-rc2 as of today, I have attached my .config for
>>> reference.  Note that I have CONFIG_IPV6_MULTIPLE_TABLES=y, but
>>> CONFIG_IP_MULTIPLE_TABLES is not mentioned at all there.
>>>
>>> To build the kernel, I have now deselected IPV6_MULTIPLE_TABLES.  Not
>>> sure why this was enabled in my .config which has grown organically over
>>> many years.
>>>
>>> Cheers,
>>>        Sven
>>>
>>>
>>>>> On Mon, Aug 17, 2020 at 12:21 AM Sven Joachim <svenjoac@....de> wrote:
>>>>>
>>>>>> On 2020-07-29 21:27 +1000, Stephen Rothwell wrote:
>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> After merging the net-next tree, today's linux-next build (i386
>>>>>> defconfig)
>>>>>>> failed like this:
>>>>>>>
>>>>>>> x86_64-linux-gnu-ld: net/core/fib_rules.o: in function
>>>>>> `fib_rules_lookup':
>>>>>>> fib_rules.c:(.text+0x5c6): undefined reference to `fib6_rule_match'
>>>>>>> x86_64-linux-gnu-ld: fib_rules.c:(.text+0x5d8): undefined reference to
>>>>>> `fib6_rule_match'
>>>>>>> x86_64-linux-gnu-ld: fib_rules.c:(.text+0x64d): undefined reference to
>>>>>> `fib6_rule_action'
>>>>>>> x86_64-linux-gnu-ld: fib_rules.c:(.text+0x662): undefined reference to
>>>>>> `fib6_rule_action'
>>>>>>> x86_64-linux-gnu-ld: fib_rules.c:(.text+0x67a): undefined reference to
>>>>>> `fib6_rule_suppress'
>>>>>>> x86_64-linux-gnu-ld: fib_rules.c:(.text+0x68d): undefined reference to
>>>>>> `fib6_rule_suppress'
>>>>>>
>>>>>> FWIW, I saw these errors in 5.9-rc1 today, so the fix in commit
>>>>>> 41d707b7332f ("fib: fix fib_rules_ops indirect calls wrappers") was
>>>>>> apparently not sufficient.
>>>>>>
>>>>>> ,----
>>>>>> | $ grep IPV6 .config
>>>>>> | CONFIG_IPV6=m
>>>>>> | # CONFIG_IPV6_ROUTER_PREF is not set
>>>>>> | # CONFIG_IPV6_OPTIMISTIC_DAD is not set
>>>>>> | # CONFIG_IPV6_MIP6 is not set
>>>>>> | # CONFIG_IPV6_ILA is not set
>>>>>> | # CONFIG_IPV6_VTI is not set
>>>>>> | CONFIG_IPV6_SIT=m
>>>>>> | # CONFIG_IPV6_SIT_6RD is not set
>>>>>> | CONFIG_IPV6_NDISC_NODETYPE=y
>>>>>> | CONFIG_IPV6_TUNNEL=m
>>>>>> | CONFIG_IPV6_MULTIPLE_TABLES=y
>>>>>> | # CONFIG_IPV6_SUBTREES is not set
>>>>>> | # CONFIG_IPV6_MROUTE is not set
>>>>>> | # CONFIG_IPV6_SEG6_LWTUNNEL is not set
>>>>>> | # CONFIG_IPV6_SEG6_HMAC is not set
>>>>>> | # CONFIG_IPV6_RPL_LWTUNNEL is not set
>>>>>> | # CONFIG_NF_SOCKET_IPV6 is not set
>>>>>> | # CONFIG_NF_TPROXY_IPV6 is not set
>>>>>> | # CONFIG_NF_DUP_IPV6 is not set
>>>>>> | # CONFIG_NF_REJECT_IPV6 is not set
>>>>>> | # CONFIG_NF_LOG_IPV6 is not set
>>>>>> | CONFIG_NF_DEFRAG_IPV6=m
>>>>>> `----
>>>>>>
>>>>>>> Caused by commit
>>>>>>>
>>>>>>>   b9aaec8f0be5 ("fib: use indirect call wrappers in the most common
>>>>>> fib_rules_ops")
>>>>>>>
>>>>>>> # CONFIG_IPV6_MULTIPLE_TABLES is not set
>>>>>>>
>>>>>>> I have reverted that commit for today.
>>>>>>
>>>>>> Cheers,
>>>>>>        Sven


-- 
~Randy

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