linux-kernel - Re: [PATCH] tristate choices with mixed tristate and boolean values (v2)

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Date:	Wed, 23 Jan 2008 18:17:19 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Jan Beulich <jbeulich@...ell.com>
Cc:	Roman Zippel <zippel@...ux-m68k.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tristate choices with mixed tristate and boolean values (v2)

On Wed, Jan 23, 2008 at 04:44:40PM +0000, Jan Beulich wrote:
> Change kconfig behavior so that mixing bool and tristate config
> settings in a choice is possible and has the desired effect of offering
> just the tristate options individually if the choice gets set to M, and
> a normal boolean selection if the choice gets set to Y.
> 
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> 
> ---
>  scripts/kconfig/expr.c |   10 ++++++++--
>  scripts/kconfig/menu.c |   33 ++++++++++++++++++++++++++++++---
>  2 files changed, 38 insertions(+), 5 deletions(-)
> 
> --- linux-2.6.24-rc8/scripts/kconfig/expr.c	2006-09-20 05:42:06.000000000 +0200
> +++ 2.6.24-rc8-tristate-choices/scripts/kconfig/expr.c	2008-01-21 13:32:44.000000000 +0100
> @@ -1034,12 +1034,18 @@ void expr_print(struct expr *e, void (*f
>  		expr_print(e->left.expr, fn, data, E_NOT);
>  		break;
>  	case E_EQUAL:
> -		fn(data, e->left.sym, e->left.sym->name);
> +		if (e->left.sym->name)
> +			fn(data, e->left.sym, e->left.sym->name);
> +		else
> +			fn(data, NULL, "<choice>");
>  		fn(data, NULL, "=");
>  		fn(data, e->right.sym, e->right.sym->name);
>  		break;
>  	case E_UNEQUAL:
> -		fn(data, e->left.sym, e->left.sym->name);
> +		if (e->left.sym->name)
> +			fn(data, e->left.sym, e->left.sym->name);
> +		else
> +			fn(data, NULL, "<choice>");
>  		fn(data, NULL, "!=");
>  		fn(data, e->right.sym, e->right.sym->name);
>  		break;
> --- linux-2.6.24-rc8/scripts/kconfig/menu.c	2007-10-09 22:31:38.000000000 +0200
> +++ 2.6.24-rc8-tristate-choices/scripts/kconfig/menu.c	2008-01-22 09:36:59.000000000 +0100
> @@ -239,9 +239,11 @@ void menu_finalize(struct menu *parent)
>  			for (menu = parent->list; menu; menu = menu->next) {
>  				if (menu->sym) {
>  					current_entry = parent;
> -					menu_set_type(menu->sym->type);
> +					if (sym->type == S_UNKNOWN)
> +						menu_set_type(menu->sym->type);
>  					current_entry = menu;
> -					menu_set_type(sym->type);
> +					if (menu->sym->type == S_UNKNOWN)
> +						menu_set_type(sym->type);
>  					break;
>  				}
>  			}
> @@ -326,7 +328,32 @@ void menu_finalize(struct menu *parent)
>  					    "values not supported");
>  			}
>  			current_entry = menu;
> -			menu_set_type(sym->type);
> +			if (menu->sym->type == S_UNKNOWN)
> +				menu_set_type(sym->type);
> +			if (sym->type == S_TRISTATE && menu->sym->type != S_TRISTATE) {
> +				basedep = expr_alloc_comp(E_EQUAL, sym, &symbol_yes);
> +				basedep = expr_alloc_and(basedep, menu->dep);
> +				basedep = expr_eliminate_dups(basedep);
> +				menu->dep = basedep;
> +				for (prop = menu->sym->prop; prop; prop = prop->next) {
> +					if (prop->menu != menu)
> +						continue;
> +					dep = expr_alloc_and(expr_copy(basedep),
> +							     prop->visible.expr);
> +					dep = expr_eliminate_dups(dep);
> +					dep = expr_trans_bool(dep);
> +					prop->visible.expr = dep;
> +					if (prop->type == P_SELECT) {
> +						struct symbol *es = prop_get_symbol(prop);
> +						dep2 = expr_alloc_symbol(menu->sym);
> +						dep = expr_alloc_and(dep2,
> +								     expr_copy(dep));
> +						dep = expr_alloc_or(es->rev_dep.expr, dep);
> +						dep = expr_eliminate_dups(dep);
> +						es->rev_dep.expr = dep;
> +					}
> +				}
> +			}
>  			menu_add_symbol(P_CHOICE, sym, NULL);
>  			prop = sym_get_choice_prop(sym);
>  			for (ep = &prop->expr; *ep; ep = &(*ep)->left.expr)
menu_finalize as it stand today is already too complicated.

Could we have this additional functionlity factored out or at least commented
so mare humans have a small chance to understand what is going on.

	Sam
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