linux-kernel - Re: [PATCH 1/2] kconfig: Show menuconfigs as menus in the .config file

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Message-ID: <CAK7LNAS+Df_V-B9Qy_39hgUZF1b6UeiHQ5m-25JekiVYSQ67dQ@mail.gmail.com>
Date:   Wed, 19 Jan 2022 03:20:50 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Ariel Marcovitch <arielmarcovitch@...il.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] kconfig: Show menuconfigs as menus in the .config file

On Mon, Dec 13, 2021 at 7:01 PM Ariel Marcovitch
<arielmarcovitch@...il.com> wrote:
>
> Until now, menuconfigs were considered configs because they had non-zero
> sym attribute. This meant that instead of having the nice menu comment
> block in the .config output file, they were merely shown as single
> configs.
>
> For example:
> ```Kconfig
> menu "Foo"
> endmenu
>
> menuconfig BAR
>         bool "Bar"
>
> config OTHER
>         bool "Other"
>         depends on BAR
> ```
>
> Will be shown as:
> ```.config
>  #
>  # Foo
>  #
>  # end of Foo


I am OK with this patch.

Just a nit.

As far as I tested your sample code (without applying this patch),
I did not see the line "# end of Foo".

The line "# end of ..." is printed when the last child gets back to
its parent, but the "Foo" menu has no child menu here.

This is out of scope of this patch, but can you update the
commit log so it matches the current behavior?

(or add one config into the "Foo" menu)







>
>  CONFIG_BAR=y
>  CONFIG_OTHER=y
> ```
>
> Instead of using the sym attribute to decide whether or not to print the
> menu block comment, check menu->prompt->type explicitly (after checking
> that menu_is_visible(menu) which means menu->prompt is not none). The
> only prompt types we actually show as menus are P_MENU and P_COMMENT. At
> the end of the menu we need to show the end of block only for P_MENU
> (although P_COMMENT prompts will not get to this flow because they don't
> have children).
>
> Signed-off-by: Ariel Marcovitch <arielmarcovitch@...il.com>
> ---
>  scripts/kconfig/confdata.c | 28 +++++++++++++++++-----------
>  1 file changed, 17 insertions(+), 11 deletions(-)
>
> diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
> index 42bc56ee238c..9f2c22f46ee0 100644
> --- a/scripts/kconfig/confdata.c
> +++ b/scripts/kconfig/confdata.c
> @@ -874,16 +874,21 @@ int conf_write(const char *name)
>         menu = rootmenu.list;
>         while (menu) {
>                 sym = menu->sym;
> -               if (!sym) {
> -                       if (!menu_is_visible(menu))
> -                               goto next;
> -                       str = menu_get_prompt(menu);
> -                       fprintf(out, "\n"
> -                                    "#\n"
> -                                    "# %s\n"
> -                                    "#\n", str);
> -                       need_newline = false;
> -               } else if (!(sym->flags & SYMBOL_CHOICE) &&
> +
> +               if (menu_is_visible(menu)) {
> +                       enum prop_type type = menu->prompt->type;
> +
> +                       if (type == P_MENU || type == P_COMMENT) {
> +                               str = menu_get_prompt(menu);
> +                               fprintf(out, "\n"
> +                                       "#\n"
> +                                       "# %s\n"
> +                                       "#\n", str);
> +                               need_newline = false;
> +                       }
> +               }
> +
> +               if (sym && !(sym->flags & SYMBOL_CHOICE) &&
>                            !(sym->flags & SYMBOL_WRITTEN)) {
>                         sym_calc_value(sym);
>                         if (!(sym->flags & SYMBOL_WRITE))
> @@ -904,7 +909,8 @@ int conf_write(const char *name)
>                 if (menu->next)
>                         menu = menu->next;
>                 else while ((menu = menu->parent)) {
> -                       if (!menu->sym && menu_is_visible(menu) &&
> +                       if (menu_is_visible(menu) &&
> +                           menu->prompt->type == P_MENU &&
>                             menu != &rootmenu) {
>                                 str = menu_get_prompt(menu);
>                                 fprintf(out, "# end of %s\n", str);
> --
> 2.25.1
>


-- 
Best Regards
Masahiro Yamada