linux-kernel - Re: [PATCH] kconfig: add KCONFIG_ALLCONFIG support for tinyconfig

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Date:   Tue, 8 Mar 2022 11:40:44 +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] kconfig: add KCONFIG_ALLCONFIG support for tinyconfig

On Sat, Mar 5, 2022 at 7:44 PM RANDRIANAINA Georges Aaron
<georges-aaron.randrianaina@...sa.fr> wrote:
>
>
> Masahiro Yamada <masahiroy@...nel.org> writes:
>
> > On Fri, Mar 4, 2022 at 2:27 AM 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.
> >>
> >> 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..337693fb4762 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 $(KCONFIG_ALLCONFIG) <(echo) kernel/configs/tiny-base.config > .tmp.config
> >
> >
> > I assume "<(echo)" exists here to insert a blank line.
> > The process substitution is a bash'ism.
> >
> > If you execute it on Debian or its variants, where /bin/sh is a symlink
> > to dash, it fails.
> >
> > masahiro@...ver:~/ref/linux$ make  KCONFIG_ALLCONFIG=/tmp/dummy.config
> > tinyconfig
> > /bin/sh: 1: Syntax error: "(" unexpected
> > make[1]: *** [scripts/kconfig/Makefile:108: tinyconfig] Error 2
> > make: *** [Makefile:619: tinyconfig] Error 2
> >
> >
> >
> > We can delete '<(echo)', but another issue is that this does not work
> > with O=<dir> option.
>
> Yes, we can delete `<(echo)`. We can solve the remaining issue by adding
> `$(srctree)` in the presets' path to make it work with O=<dir>.


Yes.


-- 
Best Regards
Masahiro Yamada