linux-kernel - Re: [PATCH] kconfig: use $K64BIT to set 64BIT with all*config targets

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Message-Id: <20071110141619.b5b7348d.randy.dunlap@oracle.com>
Date:	Sat, 10 Nov 2007 14:16:19 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kconfig: use $K64BIT to set 64BIT with all*config
 targets

On Sat, 10 Nov 2007 21:43:26 +0100 Sam Ravnborg wrote:

> The variable K64BIT can now be used to select the
> value of CONFIG_64BIT.
> 
> This is for example useful for powerpc to generate
> allmodconfig for both bit sizes - like this:
> make ARCH=powerpc K64BIT=y
> make ARCH=powerpc K64BIT=n
> 
> To use this the Kconfig file must use "64BIT" as the
> config value to select between 32 and 64 bit.
> 
> Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> ---
>  scripts/kconfig/conf.c      |    1 +
>  scripts/kconfig/confdata.c  |   27 +++++++++++++++++++++++++++
>  scripts/kconfig/lkc_proto.h |    1 +
>  3 files changed, 29 insertions(+), 0 deletions(-)
> 
> diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
> index a38787a..c6bee85 100644
> --- a/scripts/kconfig/conf.c
> +++ b/scripts/kconfig/conf.c
> @@ -591,6 +591,7 @@ int main(int ac, char **av)
>  			conf_read_simple(name, S_DEF_USER);
>  		else if (!stat("all.config", &tmpstat))
>  			conf_read_simple("all.config", S_DEF_USER);
> +		conf_set_env_sym("K64BIT", "64BIT", S_DEF_USER);
>  		break;
>  	default:
>  		break;
> diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
> index e0f402f..0cb7555 100644
> --- a/scripts/kconfig/confdata.c
> +++ b/scripts/kconfig/confdata.c
> @@ -145,6 +145,33 @@ static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
>  	return 0;
>  }
>  
> +/* Read an environment variable and assign the vaule to the symbol */

                                                  value

> +int conf_set_env_sym(const char *env, const char *symname, int def)
> +{
> +	struct symbol *sym;
> +	char *p;
> +	int def_flags;
> +
> +	p = getenv(env);
> +	if (p) {
> +		char warning[100];
> +		sprintf(warning, "Environment variable (%s = \"%s\")", env, p);
> +		conf_filename = warning;

What's with <warning> and <conf_filename> here?  I don't see how
they are used in this function or in the caller of this function.

> +		def_flags = SYMBOL_DEF << def;
> +		if (def == S_DEF_USER) {
> +			sym = sym_find(symname);
> +			if (!sym)
> +				return 1;
> +		} else {
> +			sym = sym_lookup(symname, 0);
> +			if (sym->type == S_UNKNOWN)
> +				sym->type = S_OTHER;
> +		}
> +		conf_set_sym_val(sym, def, def_flags, p);
> +	}
> +	return 0;
> +}
> +
>  int conf_read_simple(const char *name, int def)
>  {
>  	FILE *in = NULL;

---
~Randy
-
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