linux-kernel - Re: [PATCH] kconfig: untangle EXPERT and EMBEDDED

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Date:	Mon, 16 Jan 2012 18:34:44 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Andrew Jones <drjones@...hat.com>
Cc:	Jerome Marchand <jmarchan@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, rientjes@...gle.com, mingo@...e.hu,
	david.woodhouse@...el.com, gregkh@...e.de, davem@...emloft.net,
	axboe@...nel.dk, arnd@...db.de, holt@....com,
	linux-arch@...r.kernel.org, linux@....linux.org.uk,
	hskinnemoen@...il.com, egtvedt@...fundet.no, msalter@...hat.com,
	a-jacquiot@...com, starvik@...s.com, jesper.nilsson@...s.com,
	dhowells@...hat.com, takata@...ux-m32r.org,
	yasutake.koichi@...panasonic.com, jonas@...thpole.se,
	kyle@...artin.ca, deller@....de, jejb@...isc-linux.org,
	chris@...kel.net, greg@...ah.com, davej@...hat.com,
	airlied@...ux.ie, jkosina@...e.cz, mchehab@...radead.org,
	johannes@...solutions.net, linville@...driver.com
Subject: Re: [PATCH] kconfig: untangle EXPERT and EMBEDDED

On Mon, Jan 16, 2012 at 16:50, Andrew Jones <drjones@...hat.com> wrote:
> On Mon, Jan 16, 2012 at 04:40:47PM +0100, Jerome Marchand wrote:
>> > @@ -1259,8 +1259,7 @@ config SLUB
>> >        a slab allocator.
>> >
>> >  config SLOB
>> > -   depends on EXPERT
>> > -   bool "SLOB (Simple Allocator)"
>> > +   bool "SLOB (Simple Allocator)" if EXPERT
>> >     help
>> >        SLOB replaces the stock allocator with a drastically simpler
>> >        allocator. SLOB is generally more space efficient but
>>
>> Am I missing something or this particular chunk does not actually change
>> anything?
>
> No, you're correct. There's no actual change, so the hunk could be dubbed
> as an unnecessary cleanup. I made the change in order to give it the same
> general format as the rest of the expert options in that file.

There _is_ a difference:
  - "depends on EXPERT" means the option cannot be enabled by the user.
    "select SLOB" will still override that, but kconf will print a warning.
  - "bool ... if EXPERT" means the question will only be asked if EXPERT.
    Other Kconfig logic can still "select SLOB" if it wants to.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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