Date:   Wed, 12 Apr 2017 18:05:23 +0200
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Ye Xiaolong <xiaolong.ye@...el.com>
Cc:     kbuild test robot <lkp@...el.com>, Jens Axboe <axboe@...nel.dk>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux-Kernal <linux-kernel@...r.kernel.org>,
        linux-block@...r.kernel.org, Fabio Checconi <fchecconi@...il.com>,
        Mark Brown <broonie@...nel.org>, kbuild-all@...org,
        Arianna Avanzini <avanzini.arianna@...il.com>,
        Tejun Heo <tj@...nel.org>
Subject: Re: [kbuild-all] [PATCH V2 16/16] block, bfq: split bfq-iosched.c into multiple source files


> Il giorno 12 apr 2017, alle ore 11:24, Paolo Valente <paolo.valente@...aro.org> ha scritto:
> 
>> 
>> Il giorno 12 apr 2017, alle ore 10:39, Ye Xiaolong <xiaolong.ye@...el.com> ha scritto:
>> 
>> On 04/11, Paolo Valente wrote:
>>> 
>>>> Il giorno 02 apr 2017, alle ore 12:02, kbuild test robot <lkp@...el.com> ha scritto:
>>>> 
>>>> Hi Paolo,
>>>> 
>>>> [auto build test ERROR on block/for-next]
>>>> [also build test ERROR on v4.11-rc4 next-20170331]
>>>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>>>> 
>>> 
>>> Hi,
>>> this seems to be a false positive.  Build is correct with the tested
>>> tree and the .config.
>>> 
>> 
>> Hmm, this error is reproducible in 0day side, and you patches were applied on
>> top of 803e16d "Merge branch 'for-4.12/block' into for-next", is it the same as
>> yours?
>> 
> 
> I have downloaded the offending tree directly from the github page.
> 
> Here are my steps in super detail.
> 
> I followed the url:    https://github.com/0day-ci/linux/commits/Paolo-Valente/block-bfq-introduce-the-BFQ-v0-I-O-scheduler-as-an-extra-scheduler/20170402-100622
> and downloaded the tree ("Browse the repository at this point in
> history" link on the top commit, then "Download ZIP"), plus the
> .config.gz attached to the email.
> 
> Then I built with no error.
> 
> To try to help understand where the mistake is, the compilation of the
> files of course fails because each of the offending files does not
> contain the definition of the reported functions.  But that definition
> is contained in one of the other files for the same module.  I mean
> one of the files listed in the following rule in block/Makefile:
> obj-$(CONFIG_IOSCHED_BFQ)       += bfq-iosched.o bfq-wf2q.o bfq-cgroup.o
> 
> Maybe I'm making some mistake in the Makefile, or I forgot to modify
> some other configuration file?
> 
> Help! :)
> 

Ok, fortunately I've reproduced it on a different PC.  block/Makefile
was flawed, but, for unknown (to me) reasons, my system was perfectly
happy with the flaw.

Thanks,
Paolo

> Thanks,
> Paolo
> 
>> Thanks,
>> Xiaolong
>> 
>>> Thanks,
>>> Paolo
>>> 
>>>> url:    https://github.com/0day-ci/linux/commits/Paolo-Valente/block-bfq-introduce-the-BFQ-v0-I-O-scheduler-as-an-extra-scheduler/20170402-100622
>>>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
>>>> config: i386-allmodconfig (attached as .config)
>>>> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
>>>> reproduce:
>>>>      # save the attached .config to linux build tree
>>>>      make ARCH=i386 
>>>> 
>>>> All errors (new ones prefixed by >>):
>>>> 
>>>>>> ERROR: "bfq_mark_bfqq_busy" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfqg_stats_update_dequeue" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_clear_bfqq_busy" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_clear_bfqq_non_blocking_wait_rq" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_bfqq_non_blocking_wait_rq" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_clear_bfqq_wait_request" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_timeout" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfqg_stats_set_start_empty_time" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_weights_tree_add" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_put_queue" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_bfqq_sync" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfqg_to_blkg" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfqq_group" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_weights_tree_remove" [block/bfq-wf2q.ko] undefined!
>>>>>> ERROR: "bfq_bic_update_cgroup" [block/bfq-iosched.ko] undefined!
>>>>>> ERROR: "bfqg_stats_set_start_idle_time" [block/bfq-iosched.ko] undefined!
>>>>>> ERROR: "bfqg_stats_update_completion" [block/bfq-iosched.ko] undefined!
>>>>>> ERROR: "bfq_bfqq_move" [block/bfq-iosched.ko] undefined!
>>>>>> ERROR: "bfqg_put" [block/bfq-iosched.ko] undefined!
>>>>>> ERROR: "next_queue_may_preempt" [block/bfq-iosched.ko] undefined!
>>>> 
>>>> ---
>>>> 0-DAY kernel test infrastructure                Open Source Technology Center
>>>> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
>>>> <.config.gz>
>>> 
>>> _______________________________________________
>>> kbuild-all mailing list
>>> kbuild-all@...ts.01.org
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