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From:   Ulf Magnusson <ulfalizer@gmail.com>
Date:   Thu, 5 Oct 2017 05:13:25 +0200
Message-ID: <CAFkk2KSvDM4J7uM4-DG-Uj1RoMDzjjze5yMNDPrRv4+-c+1-Fw@mail.gmail.com>
Subject: Re: [PATCH] kconfig: Document the 'menu' struct
To:     yann.morin.1998@free.fr, linux-kbuild@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org, Ulf Magnusson <ulfalizer@gmail.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Arnaud Lacombe <lacombar@gmail.com>
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On Wed, Oct 4, 2017 at 5:37 AM, Ulf Magnusson <ulfalizer@gmail.com> wrote:
> Understanding what it represents helps a lot when reading the code, and
> it's not obvious, so document it.
>
> The ROOT_MENU flag is only set and tested by the gconf and qconf front
> ends, so leave it undocumented here. The obvious guess for what it means
> is correct.
>
> Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
> ---
>  scripts/kconfig/expr.h | 45 +++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
>
> diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
> index a73f762..ae7583c 100644
> --- a/scripts/kconfig/expr.h
> +++ b/scripts/kconfig/expr.h
> @@ -166,22 +166,67 @@ struct property {
>         for (st = sym->prop; st; st = st->next) \
>                 if (st->text)
>
> +/*
> + * Represents a node in the menu tree, as seen in e.g. menuconfig (though used
> + * for all front ends). Each symbol, menu, etc. defined in the Kconfig files
> + * gets a node. A symbol defined in multiple locations gets one node at each
> + * location.
> + */
>  struct menu {
> +       /* The next menu node at the same level */
>         struct menu *next;
> +
> +       /* The parent menu node, corresponding to e.g. a menu or choice */
>         struct menu *parent;
> +
> +       /* The first child menu node, for e.g. menus and choices */
>         struct menu *list;
> +
> +       /*
> +        * The symbol associated with the menu node. Choices are implemented as
> +        * a special kind of symbol. NULL for menus, comments, and ifs.
> +        */
>         struct symbol *sym;
> +
> +       /*
> +        * The prompt associated with the node. This holds the prompt for a
> +        * symbol as well as the text for a menu or comment, along with the
> +        * type (P_PROMPT, P_MENU, etc.)
> +        */
>         struct property *prompt;
> +
> +       /*
> +        * 'visible if' dependencies. If more than one is given, they will be
> +        * ANDed together.
> +        */
>         struct expr *visibility;
> +
> +       /*
> +        * Ordinary dependencies from e.g. 'depends on' and 'if', ANDed
> +        * together
> +        */
>         struct expr *dep;
> +
> +       /* MENU_* flags */
>         unsigned int flags;
> +
> +       /* Any help text associated with the node */
>         char *help;
> +
> +       /* The location where the menu node appears in the Kconfig files */
>         struct file *file;
>         int lineno;
> +
> +       /* For use by front ends that need to store auxiliary data */
>         void *data;
>  };
>
> +/*
> + * Set on a menu node when the corresponding symbol changes state in some way.
> + * Can be checked by front ends.
> + */
>  #define MENU_CHANGED           0x0001
> +
>  #define MENU_ROOT              0x0002
>
>  struct jump_key {
> --
> 2.7.4
>

Adding some CCs just because I forgot. No panic.

Cheers,
Ulf

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