linux-kernel - Re: [PATCH v3 07/12] kbuild: modpost: read modules.order instead of $(MODVERDIR)/*.mod

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Date:   Thu, 25 Jul 2019 17:27:00 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 07/12] kbuild: modpost: read modules.order instead of
 $(MODVERDIR)/*.mod

On 25.07.19 17:18, Masahiro Yamada wrote:
> Hi Jan,
> 
> On Thu, Jul 25, 2019 at 5:39 PM Jan Kiszka <jan.kiszka@...mens.com> wrote:
>>>
>>
>> This affects also external modules builds: I have patterns here that do
>>
>> [Makefile]
>> subdir-y := some-module
>>
>> [some-module/Makefile]
>> obj-m := some-module.o
>>
>> and since this patch, the final some-module.ko is no longer built. Am I missing
>> something in the kbuild makefiles, or is this a regression?
> 
> Thanks for the report.
> Interesting. I have never imagined that Makefiles were written like that.
> 
> I just wrote a fix-up, but I have not determined to apply it.
> https://patchwork.kernel.org/patch/11059033/
> 
> It is easy to fixup your Makefile, though.

Thanks for addressing this quickly! I'm happy to adjust our code [1]. Is the
suggested pattern usable with recent stable kernels as well, say down to 4.4 at
least?

Jan

[1] https://github.com/siemens/jailhouse/blob/master/Kbuild#L54

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