From: Paul Bolle <pebolle@tiscali.nl>
To: josh@joshtriplett.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Michal Hocko <mhocko@suse.cz>,
Vladimir Davydov <vdavydov@parallels.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Andy Lutomirski <luto@amacapital.net>,
Bertrand Jacquin <beber@meleeweb.net>,
"Luis R. Rodriguez" <mcgrof@suse.com>,
Iulia Manda <iulia.manda21@gmail.com>,
Pranith Kumar <bobby.prani@gmail.com>,
Clark Williams <clark.williams@gmail.com>,
Mel Gorman <mgorman@suse.de>,
Randy Dunlap <rdunlap@infradead.org>,
Michal Marek <mmarek@suse.cz>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/5] kconfig: Introduce "showif" to factor out conditions on visibility
Date: Thu, 28 May 2015 16:57:40 +0200 [thread overview]
Message-ID: <1432825060.8508.57.camel@x220> (raw)
In-Reply-To: <20150520183042.GA5720@cloud>
On Wed, 2015-05-20 at 11:30 -0700, josh@joshtriplett.org wrote:
> In net/rfkill/Kconfig, RFKILL_REGULATOR oddly has
> "depends on RFKILL || !RFKILL". WIMAX does the same thing.
That's only tristate logic. It's a common idiom, but it looks very odd
compared to boolean logic. It ensures RFKILL_REGULATOR will not be 'y'
if RFKILL is 'm'. Because:
RFKILL = 'n' => RFKILL_REGULATOR = 'n' || 'm' || 'y'
RFKILL = 'm' => RFKILL_REGULATOR = 'n' || 'm'
RFKILL = 'y' => RFKILL_REGULATOR = 'n' || 'm' || 'y'
Hope this helps,
Paul Bolle
next prev parent reply other threads:[~2015-05-28 14:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-14 15:35 [PATCH 1/5] init/Kconfig: Fix break in middle of EXPERT menu Josh Triplett
2015-05-14 15:35 ` [PATCH 2/5] init/Kconfig: Split expert menu into a separate file, init/Kconfig.expert Josh Triplett
2015-05-28 9:24 ` Paul Bolle
2015-05-14 15:35 ` [PATCH 3/5] kconfig: Regenerate parser with current Bison prior to making changes Josh Triplett
2015-05-28 9:34 ` Paul Bolle
2015-05-14 15:36 ` [PATCH 4/5] kconfig: Introduce "showif" to factor out conditions on visibility Josh Triplett
2015-05-20 10:00 ` Paul Bolle
2015-05-20 18:30 ` josh
2015-05-28 14:57 ` Paul Bolle [this message]
2015-05-28 18:28 ` Paul Bolle
2015-05-28 18:17 ` Paul Bolle
2015-05-28 18:23 ` Paul Bolle
2015-05-14 15:36 ` [PATCH 5/5] init/Kconfig.expert: Factor out "if EXPERT" conditions using showif Josh Triplett
2015-05-14 15:46 ` [PATCH 1/5] init/Kconfig: Fix break in middle of EXPERT menu josh
2015-05-28 8:41 ` Paul Bolle
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