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

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Date:	Thu, 03 Oct 2013 01:39:13 +0200
From:	Martin Walch <walch.martin@....de>
To:	David Rientjes <rientjes@...gle.com>, linux-kbuild@...r.kernel.org
Cc:	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

> > diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
> > index df198a5..ba663e1 100644
> > --- a/scripts/kconfig/expr.h
> > +++ b/scripts/kconfig/expr.h
> > @@ -93,7 +93,7 @@ struct symbol {
> >  #define SYMBOL_CHOICEVAL  0x0020  /* used as a value in a choice block */
> >  #define SYMBOL_VALID      0x0080  /* set when symbol.curr is calculated */
> >  #define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */
> > -#define SYMBOL_WRITE      0x0200  /* ? */
> > +#define SYMBOL_WRITE      0x0200  /* write symbol to file (KCONFIG_CONFIG) */
> >  #define SYMBOL_CHANGED    0x0400  /* ? */
> >  #define SYMBOL_AUTO       0x1000  /* value from environment variable */
> >  #define SYMBOL_CHECKED    0x2000  /* used during dependency checking */
> 
> Perhaps stating that the choice is writable by the user?

As far as I understand SYMBOL_WRITE, its main purpose is in the function
conf_write in confdata.c:

>if (!(sym->flags & SYMBOL_WRITE))
>	goto next;
>sym->flags &= ~SYMBOL_WRITE;
>
>conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);

So, if I have not missed anything, SYMBOL_WRITE decides whether to write a symbol
to .config or not. This does not necessarily mean that the user can change the value.
SYMBOL_WRITE may be set and the symbol may be written to .config while the user
does not even see the corresponding prompt.
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