From: Andrew Jones <drjones@redhat.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jerome Marchand <jmarchan@redhat.com>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
rientjes@google.com, mingo@elte.hu, david.woodhouse@intel.com,
gregkh@suse.de, davem@davemloft.net, axboe@kernel.dk,
arnd@arndb.de, holt@sgi.com, linux-arch@vger.kernel.org,
linux@arm.linux.org.uk, hskinnemoen@gmail.com,
egtvedt@samfundet.no, msalter@redhat.com, a-jacquiot@ti.com,
starvik@axis.com, jesper.nilsson@axis.com, dhowells@redhat.com,
takata@linux-m32r.org, yasutake.koichi@jp.panasonic.com,
jonas@southpole.se, kyle@mcmartin.ca, deller@gmx.de,
jejb@parisc-linux.org, chris@zankel.net, greg@kroah.com,
davej@redhat.com, airlied@linux.ie, jkosina@suse.cz,
mchehab@infradead.org, johannes@sipsolutions.net,
linville@tuxdriver.com
Subject: Re: [PATCH] kconfig: untangle EXPERT and EMBEDDED
Date: Tue, 17 Jan 2012 09:28:43 +0100 [thread overview]
Message-ID: <20120117082842.GA3188@turtle.usersys.redhat.com> (raw)
In-Reply-To: <CAMuHMdV=yhacfyS691kdzXNOTcOEWi-AxPcUDquYci3=J3AhMQ@mail.gmail.com>
On Mon, Jan 16, 2012 at 06:34:44PM +0100, Geert Uytterhoeven wrote:
> On Mon, Jan 16, 2012 at 16:50, Andrew Jones <drjones@redhat.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.
>
No, they are equivalent. It says in the documentation
(Documentation/kbuild/kconfig-language.txt)
- dependencies: "depends on" <expr>
This defines a dependency for this menu entry. If multiple
dependencies are defined, they are connected with '&&'. Dependencies
are applied to all other options within this menu entry (which also
accept an "if" expression), so these two examples are equivalent:
bool "foo" if BAR
default y if BAR
and
depends on BAR
bool "foo"
default y
SLOB doesn't have a default option in its entry (it actually can't, since
it's a choice value), or any other option type besides help, so the change
in the patch above is precisely equivalent.
If you got a warning with one style, but not the other, then that would be
a bug with kconf. However, I just tried to generate a warning with both
styles and couldn't.
Drew
next prev parent reply other threads:[~2012-01-17 8:31 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-11 15:16 [PATCH] kconfig: untangle EXPERT and EMBEDDED Andrew Jones
2012-01-11 21:57 ` David Rientjes
2012-01-12 9:18 ` Arnd Bergmann
2012-01-12 10:18 ` Andrew Jones
2012-01-12 21:06 ` David Rientjes
2012-01-13 8:51 ` Andrew Jones
2012-01-13 10:53 ` David Rientjes
2012-01-13 12:22 ` Andrew Jones
2012-01-13 21:27 ` David Rientjes
2012-01-16 9:20 ` Andrew Jones
2012-01-16 23:28 ` David Rientjes
2012-01-17 14:27 ` Andrew Jones
2012-01-17 20:46 ` David Rientjes
2012-01-18 8:14 ` Andrew Jones
2012-01-18 9:19 ` David Rientjes
2012-01-16 15:31 ` Jerome Marchand
2012-01-16 23:37 ` David Rientjes
2012-01-17 14:46 ` Andrew Jones
2012-01-17 20:54 ` David Rientjes
2012-01-18 8:51 ` Jerome Marchand
2012-01-18 8:56 ` Andrew Jones
2012-01-18 9:31 ` David Rientjes
2012-01-18 9:54 ` Andrew Jones
2012-01-18 9:38 ` Andrew Jones
2012-01-12 20:59 ` David Rientjes
2012-01-16 15:40 ` Jerome Marchand
2012-01-16 15:50 ` Andrew Jones
2012-01-16 17:34 ` Geert Uytterhoeven
2012-01-17 8:28 ` Andrew Jones [this message]
2012-01-18 11:08 ` Andrew Jones
2012-01-18 20:28 ` Andrew Morton
2012-01-18 20:46 ` Russell King - ARM Linux
2012-01-18 21:04 ` Alexey Dobriyan
2012-01-18 21:36 ` Andrew Morton
2012-01-18 21:48 ` Paul Bolle
2012-01-18 21:55 ` Andrew Morton
2012-01-18 22:13 ` Russell King - ARM Linux
2012-01-18 22:06 ` Alexey Dobriyan
2012-01-18 22:13 ` Dave Jones
2012-01-19 8:09 ` Andrew Jones
2012-01-23 13:46 ` Andrew Jones
2012-01-24 0:43 ` David Rientjes
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