linux-kernel - Re: [PATCH 0/2] kconfig: allow use of relations other than (in)equality

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Message-ID: <1435915103.2423.53.camel@tiscali.nl>
Date:	Fri, 03 Jul 2015 11:18:23 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Martin Walch <walch.martin@....de>
Cc:	Michal Marek <mmarek@...e.cz>, Jan Beulich <JBeulich@...e.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] kconfig: allow use of relations other than
 (in)equality

On do, 2015-07-02 at 22:06 +0200, Michal Marek wrote:
> The patch just adds four new binary operations of the same order as 
> the
> existing == and !=, with a the semantics that everybody expects. And 
> the
> grammar for kconfig expressions is so simplistic that you cannot even
> write things like (A && B) == (C && D). So turing completeness is not 
> a
> topic here, neither before nor after this patch.

So, if you're worried by the complexity added by allowing these
operations, you might considering keeping an eye out for patches that
use them. Because, obviously, the review of those patches could also be
used to demonstrate their downsides. Actually, since
DEBUG_UART_8250_WORD already uses ">=", and that's now become legal,
perhaps the downsides can already be demonstrated.

Thanks,


Paul Bolle
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