linux-kernel - Re: [PATCH 1/2] kconfig: Print full defined and depends for multiply-defined symbols

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Date:	Fri, 10 Apr 2015 23:25:43 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Gregory Fong <gregory.0xf0@...il.com>
Cc:	Michal Marek <mmarek@...e.cz>,
	Valentin Rothberg <valentinrothberg@...il.com>,
	Stefan Hengelein <stefan.hengelein@....de>,
	Andreas Ruprecht <rupran@...server.de>,
	Martin Walch <walch.martin@....de>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] kconfig: Print full defined and depends for
 multiply-defined symbols

[Removed Yann. Added the people that I hope might actually understand
what this is all about.] 

On Wed, 2015-04-08 at 16:56 -0700, Gregory Fong wrote:
> get_symbol_str() was assuming that symbols would only have a single
> property for the purpose of printing define and depends information.
> This is not true, and one current example is FRAME_POINTER which is
> both in lib/Kconfig.debug and arch/arm/Kconfig.debug.
> 
> In order to print out the correct Defined and Depends info, iterate
> over all properties associated with the given symbol, similarly to was
> done for selects.  And for depends, rather than iterating over the
> property, just use the direct dependency expression.
> 
> CONFIG_FRAME_POINTER text, before:
>   Defined at lib/Kconfig.debug:323
>   Depends on: DEBUG_KERNEL [=y] && (ARM [=y] || CRIS || M68K || FRV || UML || AVR32 || SUPERH || BLACKFIN || MN10300 || METAG) || ARCH_WANT_FRAME_POINTERS [=n]
> 
> After:
>   Defined at lib/Kconfig.debug:323, arch/arm/Kconfig.debug:35
>   Depends on: DEBUG_KERNEL [=y] && (ARM [=y] || CRIS || M68K || FRV || UML || AVR32 || SUPERH || BLACKFIN || MN10300 || METAG) || ARCH_WANT_FRAME_POINTERS [=n] || !THUMB2_KERNEL [=n]

Note that there are currently six places where FRAME_POINTER is defined:
    arch/arm/Kconfig.debug:35:config FRAME_POINTER
    arch/arm64/Kconfig.debug:5:config FRAME_POINTER
    arch/hexagon/Kconfig:40:config FRAME_POINTER
    arch/m32r/Kconfig.debug:13:config FRAME_POINTER
    arch/sparc/Kconfig.debug:19:config FRAME_POINTER
    lib/Kconfig.debug:323:config FRAME_POINTER

Anyhow, does anyone dare to state that the After: line above describes
FRAME_POINTER for arm correctly? (Of course, I could dive in the semi
documented kconfig code myself. But that might mean that Gregory will be
waiting for feedback for quite some time.)

> Removes now-unused function get_symbol_prop().

It might be better to do that in a separate patch. 

> Signed-off-by: Gregory Fong <gregory.0xf0@...il.com>
> ---
>  scripts/kconfig/menu.c | 35 +++++++++++++++--------------------
>  1 file changed, 15 insertions(+), 20 deletions(-)
> 
> diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
> index 72c9dba..da482ff 100644
> --- a/scripts/kconfig/menu.c
> +++ b/scripts/kconfig/menu.c
> @@ -601,18 +601,6 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
>  }
>  
>  /*
> - * get property of type P_SYMBOL
> - */
> -static struct property *get_symbol_prop(struct symbol *sym)
> -{
> -	struct property *prop = NULL;
> -
> -	for_all_properties(sym, prop, P_SYMBOL)
> -		break;
> -	return prop;
> -}
> -
> -/*
>   * head is optional and may be NULL
>   */
>  void get_symbol_str(struct gstr *r, struct symbol *sym,
> @@ -637,15 +625,22 @@ void get_symbol_str(struct gstr *r, struct symbol *sym,
>  	for_all_prompts(sym, prop)
>  		get_prompt_str(r, prop, head);
>  
> -	prop = get_symbol_prop(sym);
> -	if (prop) {
> -		str_printf(r, _("  Defined at %s:%d\n"), prop->menu->file->name,
> +	hit = false;
> +	for_all_properties(sym, prop, P_SYMBOL) {
> +		if (!hit) {
> +			str_append(r, "  Defined at ");
> +			hit = true;
> +		} else
> +			str_append(r, ", ");
> +		str_printf(r, _("%s:%d"), prop->menu->file->name,
>  			prop->menu->lineno);
> -		if (!expr_is_yes(prop->visible.expr)) {
> -			str_append(r, _("  Depends on: "));
> -			expr_gstr_print(prop->visible.expr, r);
> -			str_append(r, "\n");
> -		}
> +	}
> +	if (hit)
> +		str_append(r, "\n");
> +	if (!expr_is_yes(sym->dir_dep.expr)) {
> +		str_append(r, _("  Depends on: "));
> +		expr_gstr_print(sym->dir_dep.expr, r);
> +		str_append(r, "\n");
>  	}
>  
>  	hit = false;

Thanks,


Paul Bolle

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