kconfig: Document the 'menu' struct

	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 {