linux-kernel - Re: [PATCH v2 7/8] kbuild: use obj-y instead extra-y for objects placed at the head

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Date:   Tue, 20 Sep 2022 06:33:03 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH v2 7/8] kbuild: use obj-y instead extra-y for objects
 placed at the head

On 9/19/22 23:56, Geert Uytterhoeven wrote:
> Hi Günter,
> 
> On Tue, Sep 20, 2022 at 12:59 AM Guenter Roeck <linux@...ck-us.net> wrote:
>> On Tue, Sep 06, 2022 at 03:13:12PM +0900, Masahiro Yamada wrote:
>>> The objects placed at the head of vmlinux need special treatments:
>>>
>>>   - arch/$(SRCARCH)/Makefile adds them to head-y in order to place
>>>     them before other archives in the linker command line.
>>>
>>>   - arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of
>>>     obj-y to avoid them going into built-in.a.
>>>
>>> This commit gets rid of the latter.
>>>
>>> Create vmlinux.a to collect all the objects that are unconditionally
>>> linked to vmlinux. The objects listed in head-y are moved to the head
>>> of vmlinux.a by using 'ar m'.
>>>
>>> With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-y
>>> for builtin objects.
>>>
>>> There is no *.o that is directly linked to vmlinux. Drop unneeded code
>>> in scripts/clang-tools/gen_compile_commands.py.
>>>
>>> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
>>> Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> 
> Where does this R-b come from? It was not present in Yamada-san's
> posting. Added by b4?
> 

Maybe added by patchwork ? That is where I picked up the mbox.

Guenter

>> The following build failure is seen when building m68k:defconfig in
>> next-20220919.
> 
> [...]
> 
>> # first bad commit: [6676e2cdd7c339dc40331faccbaac1112d2c1d78] kbuild: use obj-y instead extra-y for objects placed at the head
> 
> I did provide my R-b on Yamada-san's fix for this issue, which was
> sent later in this thread.
> 
> Gr{oetje,eeting}s,
> 
>                          Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                  -- Linus Torvalds