linux-kernel - Re: [PATCH] kconfig: remove redundant streamline

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Date:   Thu, 1 Mar 2018 23:39:27 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Ulf Magnusson <ulfalizer@...il.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Marc Herbert <marc.herbert@...el.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kconfig: remove redundant streamline_config.pl prerequisite

2018-03-01 20:18 GMT+09:00 Ulf Magnusson <ulfalizer@...il.com>:
> The local{yes,mod}config targets currently have streamline_config.pl as
> a prerequisite. This is redundant, because streamline_config.pl is a
> checked-in file with no prerequisites.
>
> Remove the prerequisite and reference streamline_config.pl directly in
> the recipe of the rule instead.
>
> Signed-off-by: Ulf Magnusson <ulfalizer@...il.com>
> ---
>  scripts/kconfig/Makefile | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index 1f74336d4e23..58be52cb464d 100644


Thanks! Almost good.

Just small nits.


> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -77,9 +77,9 @@ silentoldconfig: $(obj)/conf
>             touch   include/generated/autoksyms.h
>         $< $(silent) --$@ $(Kconfig)
>
> -localyesconfig localmodconfig: $(obj)/streamline_config.pl $(obj)/conf
> +localyesconfig localmodconfig: $(obj)/conf
>         $(Q)mkdir -p include/config include/generated
> -       $(Q)perl $< --$@ $(srctree) $(Kconfig) > .tmp.config
> +       $(Q)perl $(obj)/streamline_config.pl --$@ $(srctree) $(Kconfig) > .tmp.config



'$(src)/streamline_config.pl' is better than '$(obj)/streamline_config.pl'
since it is a checked-in file.

'$(src)' and '$(obj)' are always the same.
(https://github.com/torvalds/linux/blob/master/scripts/Makefile.build#L6)


So, there is no effective difference.
It is just a coding convention to use $(obj)/ for generated files,
and $(src)/ for source files.

The original code already used $(obj)/, so this is not your fault
but I want to fix it while we are here.



One more nit.

$(obj)/conf $(silent) --silentoldconfig $(Kconfig);

can be

$< $(silent) --silentoldconfig $(Kconfig);


I guess you did not touch this line to avoid
conflict with my patch.



If you agree those two, shall I fix it up
when I apply it?





>         $(Q)if [ -f .config ]; then                                     \
>                         cmp -s .tmp.config .config ||                   \
>                         (mv -f .config .config.old.1;                   \
> --
> 2.14.1
>
> --
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-- 
Best Regards
Masahiro Yamada