linux-kernel - Re: [PATCH v2] arm64: mm: use macro instead of if judgement of ZONE

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Message-ID: <20141016171012.GE5252@e104818-lin.cambridge.arm.com>
Date:	Thu, 16 Oct 2014 18:10:13 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Yifan Zhang <yifan.zhangm@...il.com>
Cc:	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"lauraa@...eaurora.org" <lauraa@...eaurora.org>,
	"ganapatrao.kulkarni@...iumnetworks.com" 
	<ganapatrao.kulkarni@...iumnetworks.com>,
	"robh@...nel.org" <robh@...nel.org>,
	"leif.lindholm@...aro.org" <leif.lindholm@...aro.org>,
	"Yalin.Wang@...ymobile.com" <Yalin.Wang@...ymobile.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yifan Zhang <zhangyf@...vell.com>
Subject: Re: [PATCH v2] arm64: mm: use macro instead of if judgement of
 ZONE_DMA

On Thu, Oct 16, 2014 at 10:41:01AM +0100, Yifan Zhang wrote:
> if disable CONFIG_ZONE_DMA, ZONE_DMA becomes undefined.

I agree that this is the case but can you explain why you need to
disable ZONE_DMA? It currently is def_bool y, so it cannot be disabled
unless you hack the Kconfig.

-- 
Catalin
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