linux-kernel - Re: [PATCH] clk: sunxi-ng: Move all clock types to a library

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Message-ID: <CAGb2v66QvLdojDe4+uG9Opa7fApA-GH9pW4v0En5j6QSPf1yZw@mail.gmail.com>
Date:   Wed, 7 Jun 2017 13:45:45 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        kbuild test robot <lkp@...el.com>,
        Stephen Boyd <sboyd@...eaurora.org>, kbuild-all@...org,
        Chen-Yu Tsai <wens@...e.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] clk: sunxi-ng: Move all clock types to a library

On Tue, Jun 6, 2017 at 6:04 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Mon, Jun 5, 2017 at 4:45 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
>> Hi,
>>
>> On Sat, Jun 03, 2017 at 12:22:32PM +0800, kbuild test robot wrote:
>>> Hi Stephen,
>>>
>>> [auto build test ERROR on sunxi/sunxi/for-next]
>>> [also build test ERROR on next-20170602]
>>> [cannot apply to clk/clk-next v4.12-rc3]
>>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>>>
>>>    sunxi_sid.c:(.data+0x1da8c): undefined reference to `ccu_gate_ops'
>>>    sunxi_sid.c:(.data+0x1dac8): undefined reference to `ccu_gate_ops'
>>>    sunxi_sid.c:(.data+0x1db20): undefined reference to `ccu_mux_ops'
>>>    sunxi_sid.c:(.data+0x1db74): undefined reference to `ccu_mux_ops'
>>>    sunxi_sid.c:(.data+0x1dbec): undefined reference to `ccu_mp_ops'
>>>    sunxi_sid.c:(.data+0x1dc64): undefined reference to `ccu_mp_ops'
>>
>> It seems like even though the lib.a file is compiled properly, it is
>> never linked in. It looks like we would be supposed to add
>> drivers/clk/sunxi-ng/ to libs-y, but that doesn't seem to work for
>> Makefiles in drivers/*
>
> Ah, too bad. I see that only one directory under drivers/ uses something
> with lib.a, in drivers/firmware/efi/libstub/Makefile, but that seems to
> rely on being special-cased as well.
>
> However, this patch seems to fix it:
>
> diff --git a/drivers/clk/sunxi-ng/Makefile b/drivers/clk/sunxi-ng/Makefile
> index cbc8cb4f70e3..321d3da7cc6a 100644
> --- a/drivers/clk/sunxi-ng/Makefile
> +++ b/drivers/clk/sunxi-ng/Makefile
> @@ -18,16 +18,16 @@ lib-$(CONFIG_SUNXI_CCU) += ccu_nm.o
>  lib-$(CONFIG_SUNXI_CCU) += ccu_mp.o
>
>  # SoC support
> -obj-$(CONFIG_SUN50I_A64_CCU) += ccu-sun50i-a64.o
> -obj-$(CONFIG_SUN5I_CCU) += ccu-sun5i.o
> -obj-$(CONFIG_SUN6I_A31_CCU) += ccu-sun6i-a31.o
> -obj-$(CONFIG_SUN8I_A23_CCU) += ccu-sun8i-a23.o
> -obj-$(CONFIG_SUN8I_A33_CCU) += ccu-sun8i-a33.o
> -obj-$(CONFIG_SUN8I_A83T_CCU) += ccu-sun8i-a83t.o
> -obj-$(CONFIG_SUN8I_H3_CCU) += ccu-sun8i-h3.o
> -obj-$(CONFIG_SUN8I_V3S_CCU) += ccu-sun8i-v3s.o
> -obj-$(CONFIG_SUN8I_DE2_CCU) += ccu-sun8i-de2.o
> -obj-$(CONFIG_SUN8I_R_CCU) += ccu-sun8i-r.o
> -obj-$(CONFIG_SUN9I_A80_CCU) += ccu-sun9i-a80.o
> -obj-$(CONFIG_SUN9I_A80_CCU) += ccu-sun9i-a80-de.o
> -obj-$(CONFIG_SUN9I_A80_CCU) += ccu-sun9i-a80-usb.o
> +obj-$(CONFIG_SUN50I_A64_CCU) += ccu-sun50i-a64.o lib.a
> +obj-$(CONFIG_SUN5I_CCU) += ccu-sun5i.o lib.a
> +obj-$(CONFIG_SUN6I_A31_CCU) += ccu-sun6i-a31.o lib.a
> +obj-$(CONFIG_SUN8I_A23_CCU) += ccu-sun8i-a23.o lib.a
> +obj-$(CONFIG_SUN8I_A33_CCU) += ccu-sun8i-a33.o lib.a
> +obj-$(CONFIG_SUN8I_A83T_CCU) += ccu-sun8i-a83t.o lib.a
> +obj-$(CONFIG_SUN8I_H3_CCU) += ccu-sun8i-h3.o lib.a
> +obj-$(CONFIG_SUN8I_V3S_CCU) += ccu-sun8i-v3s.o lib.a
> +obj-$(CONFIG_SUN8I_DE2_CCU) += ccu-sun8i-de2.o lib.a
> +obj-$(CONFIG_SUN8I_R_CCU) += ccu-sun8i-r.o lib.a
> +obj-$(CONFIG_SUN9I_A80_CCU) += ccu-sun9i-a80.o lib.a
> +obj-$(CONFIG_SUN9I_A80_CCU) += ccu-sun9i-a80-de.o lib.a
> +obj-$(CONFIG_SUN9I_A80_CCU) += ccu-sun9i-a80-usb.o lib.a
>
> It's not documented behavior, but I think it's still good enough,
> and improves the current version, unless there is another bug
> after we add this to your patch.

I think having just

obj-$(CONFIG_SUNXI_CCU) += lib.a

at the bottom (with a comment) would be cleaner, and
we wouldn't need to modify all the existing lines.
AFAIK about Makefiles, that should work?

ChenYu

>
>         Arnd