linux-kernel - Re: [PATCH 2/3] ARM: Remove redundant ARCH_SPARSEMEM

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Message-ID: <2541002.3d7fzEFzRU@wuerfel>
Date:	Fri, 05 Jun 2015 14:23:30 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Gregory Fong <gregory.0xf0@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Kevin Cernekee <cernekee@...il.com>,
	Russell King <linux@....linux.org.uk>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] ARM: Remove redundant ARCH_SPARSEMEM_DEFAULT setting

On Thursday 04 June 2015 18:58:37 Gregory Fong wrote:
> From: Kevin Cernekee <cernekee@...il.com>
> 
> If ARCH_SPARSEMEM_ENABLE=y and ARCH_{FLATMEM,DISCONTIGMEM}_ENABLE=n,
> then the logic in mm/Kconfig already makes CONFIG_SPARSEMEM the only
> choice.  This is true for all of the existing ARM users of
> ARCH_SPARSEMEM_ENABLE.
> 
> Forcing ARCH_SPARSEMEM_DEFAULT=y if ARCH_SPARSEMEM_ENABLE=y prevents
> us from ever defaulting to FLATMEM, so we should remove this setting.
> 
> Signed-off-by: Kevin Cernekee <cernekee@...il.com>
> Signed-off-by: Gregory Fong <gregory.0xf0@...il.com>
> 

Acked-by: Arnd Bergmann <arnd@...db.de>

It took me a while to understand the logic, but your patch does
make a lot of sense to me now.

	Arnd
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