linux-kernel - Re: [PATCH 1/4] kconfig: add short explanation to SYMBOL

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Date:	Thu, 03 Oct 2013 02:26:49 +0200
From:	Martin Walch <walch.martin@....de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-kbuild@...r.kernel.org, Michal Marek <mmarek@...e.cz>,
	Jiri Kosina <trivial@...nel.org>,
	"Yann E. MORIN" <yann.morin.1998@...e.fr>,
	Arve Hjønnevåg <arve@...roid.com>,
	Benjamin Poirier <bpoirier@...e.de>,
	Dirk Gouders <dirk@...ders.net>,
	Wang YanQing <udknight@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jean Delvare <jdelvare@...e.de>,
	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] kconfig: add short explanation to SYMBOL_WRITE

On Wednesday 02 October 2013 16:42:27 David Rientjes wrote:
> The purpose of SYMBOL_WRITE is in sym_calc_value() where it is set if the 
> config symbol is visible and settable by the user, which is why I 
> suggested it be specified as being writable by the user.

Then this looks strange to me: a config symbol of type boolean or tristate
that is not visible, but has a default value != n will have SYMBOL_WRITE set
in sym_calc_value:

> case S_BOOLEAN:
> case S_TRISTATE:
>	if (sym_is_choice_value(sym) && sym->visible == yes) {
> 		...
>	} else {
>		...
> 		if (!sym_is_choice(sym)) {
> 			prop = sym_get_default_prop(sym);
> 			if (prop) {
> 				sym->flags |= SYMBOL_WRITE;
> 				newval.tri = EXPR_AND(expr_calc_value(prop->expr),
> 					prop->visible.tri);
> 			}
> 		}
>		...
>	}
-- 

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