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

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Date:	Wed, 14 Nov 2007 21:57:32 +0100 (CET)
From:	Roman Zippel <zippel@...ux-m68k.org>
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

Hi,

On Sat, 10 Nov 2007, Sam Ravnborg wrote:

> +	if (p) {
> +		char warning[100];
> +		sprintf(warning, "Environment variable (%s = \"%s\")", env, p);
> +		conf_filename = warning;
> +		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;

This is more complex than necessary, this should be enough:

	sym = sym_find(symname);
	if (sym)
		sym_set_string_value(sym, p);

This is not a direct user interface, so the potential stricter error 
checking is not really needed.

In general I think it's problematic that this is only checked, when the 
config system is called, i.e. with a configured kernel adding ARCH would 
have no effect, what makes this more confusing is that one can later omit 
the ARCH variable, since it's saved in the .config. I think it would be 
better to check for this directly in the Makefile and then use a separate 
tool to set the variable directly (which could be simply sed or a simple 
helper program).

bye, Roman
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