Re: [PATCH] ARM: use "depends on" for SoC configs instead of "if" after prompt

From: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
To: Masahiro Yamada
	<yamada.masahiro-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org>
Cc: Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>,
	Krzysztof Kozlowski
	<k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
	kernel-F5mvAk5X5gdBDgjK7y7TUQ@public.gmane.org,
	linux-sh-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Linus Walleij
	<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Liviu Dudau <liviu.dudau-5wv7dgnIgG8@public.gmane.org>,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Matthias Brugger
	<matthias.bgg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Thierry Reding
	<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Alexandre Belloni
	<alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	Jamie Iles <jamie-wmLquQDDieKakBO8gow8eQ@public.gmane.org>,
	Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>,
	Alexandre Courbot
	<gnurou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Florian Fainelli
	<f.fainelli-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
	Viresh Kumar <vireshk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Magnus Damm <magnus.damm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Michal Simek
	<michal.simek-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>,
	Wei Xu <xuwei5-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>,
	Lorenzo Pieralisi
	<lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>,
	linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	Chen-Yu Tsai <wens@csie>
Subject: Re: [PATCH] ARM: use "depends on" for SoC configs instead of "if" after prompt
Date: Mon, 16 Nov 2015 10:31:13 +0100	[thread overview]
Message-ID: <20151116093113.GI32142@lukather> (raw)
In-Reply-To: <1447643170-23773-1-git-send-email-yamada.masahiro-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org>

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Hi,

On Mon, Nov 16, 2015 at 12:06:10PM +0900, Masahiro Yamada wrote:
> Many ARM sub-architectures use prompts followed by "if" conditional,
> but it is wrong.
> 
> Please notice the difference between
> 
>     config ARCH_FOO
>             bool "Foo SoCs" if ARCH_MULTI_V7
> 
> and
> 
>     config ARCH_FOO
>             bool "Foo SoCs"
>             depends on ARCH_MULTI_V7
> 
> These two are *not* equivalent!
> 
> In the former statement, it is not ARCH_FOO, but its prompt that
> depends on ARCH_MULTI_V7.  So, it is completely valid that ARCH_FOO
> is selected by another, but ARCH_MULTI_V7 is still disabled. As it is
> not unmet dependency, Kconfig never warns.  This is probably not what
> you want.
> 
> The former should be used only when you need to do so, and you really
> understand what you are doing.  (In most cases, it should be wrong!)
> 
> For enabling/disabling sub-architectures, the latter is always correct.
> 
> As a good side effect, this commit fixes some entries over 80 columns
> (mach-imx, mach-integrator, mach-mbevu).
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org>

For the sunxi part,

Acked-by: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>

Thanks,
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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