linux-kernel - Re: [PATCH v2] kconfig: add KCONFIG

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Message-ID: <CAK7LNATrTGhyHSkoZSXVyJM8nZfG3RF8U=pvA7Te8Bt0iW7E7g@mail.gmail.com>
Date:   Wed, 9 Mar 2022 18:43:24 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Randrianaina Georges Aaron <georges-aaron.randrianaina@...sa.fr>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mathieu Acher <mathieu.acher@...sa.fr>
Subject: Re: [PATCH v2] kconfig: add KCONFIG_ALLCONFIG support for tinyconfig

On Tue, Mar 8, 2022 at 5:40 PM Randrianaina Georges Aaron
<georges-aaron.randrianaina@...sa.fr> wrote:
>
> Since f8f0d06438e5, tinyconfig overrides KCONFIG_ALLCONFIG to include
> kernel/configs/tiny-base.config. However, this ignores user's preset if
> defined.
>
> This modification checks if the user has set KCONFIG_ALLCONFIG and if so,
> concatenates it with kernel/configs/tiny-base.config to be used as preset
> config symbols.
>
> Changes in v2:
> - Remove `<(echo)` in the cat command as it is not portable
> - Add $(srctree) in presets' path to make it compatible with O=<dir>
>
> Signed-off-by: Randrianaina Georges Aaron <georges-aaron.randrianaina@...sa.fr>
> ---
>  scripts/kconfig/Makefile | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index b8ef0fb4bbef..58a677db9a73 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -102,7 +102,13 @@ configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/c
>
>  PHONY += tinyconfig
>  tinyconfig:
> +ifeq ($(KCONFIG_ALLCONFIG),)
>         $(Q)KCONFIG_ALLCONFIG=kernel/configs/tiny-base.config $(MAKE) -f $(srctree)/Makefile allnoconfig
> +else
> +       $(Q)cat $(srctree)/$(KCONFIG_ALLCONFIG) $(srctree)/kernel/configs/tiny-base.config > $(srctree)/.tmp.config


No.  Please remove $(srctree)/ from .tmp.config

You should never ever write anything to $(srctree)
when O= is given.


$(srctree)/$(KCONFIG_ALLCONFIG) does not work well.
It works only when KCONFIG_ALLCOFIG is relative to $(srctree).
It does not work if it is absolute for example.








> +       $(Q)KCONFIG_ALLCONFIG=$(srctree)/.tmp.config $(MAKE) -f $(srctree)/Makefile allnoconfig
> +       $(Q)rm -f $(srctree)/.tmp.config
> +endif
>         $(Q)$(MAKE) -f $(srctree)/Makefile tiny.config
>
>  # CHECK: -o cache_dir=<path> working?
> --
> 2.34.1



-- 
Best Regards
Masahiro Yamada