linux-kernel - Re: [PATCH 2.6.35-rc6] kconfig: fix MODULES-related bug in case of no .config

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Message-ID: <20100728062313.GC5161@cr0.nay.redhat.com>
Date:	Wed, 28 Jul 2010 14:23:13 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Ulf Magnusson <ulfalizer.lkml@...il.com>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.35-rc6] kconfig: fix MODULES-related bug in case of
 no .config

On Tue, Jul 27, 2010 at 09:57:43PM +0200, Ulf Magnusson wrote:
>On Tue, Jul 27, 2010 at 09:27:27PM +0200, Ulf Magnusson wrote:
>> Hi,
>> 
>> There seems to be a kconfig bug due to MODULES not always being evaluated if no
>> .config is found. Take the following Kconfig as an example:
>> 
>> config MODULES
>> 	def_bool y
>> 
>> config FOO
>> 	def_tristate m
>> 
>> With no .config, the following configuration is generated:
>> 
>> CONFIG_MODULES=y
>> CONFIG_FOO=y
>> 
>> With an empty .config, the following:
>> 
>> CONFIG_MODULES=y
>> CONFIG_FOO=m
>> 
>> Tristate choice statements can also exhibit the problem, due to having an
>> implicit rev_dep (select) containing "m".
>> 
>> The problem is that MODULES is never evaluted in conf_read_simple() unless
>> there's a .config. The following patch fixes this.

<snip>

>
>Silly error in the patch. The correct patch follows.
>
>Signed-off-by: Ulf Magnusson <ulfalizer.lkml@...il.com>
>

Sounds good for me.

Reviewed-by: WANG Cong <xiyou.wangcong@...il.com>


>diff -uNr linux.vanilla/scripts/kconfig/confdata.c linux.new/scripts/kconfig/confdata.c
>--- linux.vanilla/scripts/kconfig/confdata.c	2010-07-27 16:47:43.443006287 +0200
>+++ linux.new/scripts/kconfig/confdata.c	2010-07-27 21:48:07.471550551 +0200
>@@ -170,8 +170,11 @@
> 		if (in)
> 			goto load;
> 		sym_add_change_count(1);
>-		if (!sym_defconfig_list)
>+		if (!sym_defconfig_list) {
>+			if (modules_sym)
>+				sym_calc_value(modules_sym);
> 			return 1;
>+		}
> 
> 		for_all_defaults(sym_defconfig_list, prop) {
> 			if (expr_calc_value(prop->visible.expr) == no ||
>--
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