linux-kernel - Re: [PATCH v2] arm64: mm: make CONFIG_ZONE

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Message-ID: <20190604132159.GD6610@arrakis.emea.arm.com>
Date:   Tue, 4 Jun 2019 14:21:59 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Miles Chen <miles.chen@...iatek.com>
Cc:     Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v2] arm64: mm: make CONFIG_ZONE_DMA32 configurable

On Wed, May 29, 2019 at 12:08:20AM +0800, Miles Chen wrote:
> This change makes CONFIG_ZONE_DMA32 defuly y and allows users
> to overwrite it only when CONFIG_EXPERT=y.
> 
> For the SoCs that do not need CONFIG_ZONE_DMA32, this is the
> first step to manage all available memory by a single
> zone(normal zone) to reduce the overhead of multiple zones.
> 
> The change also fixes a build error when CONFIG_NUMA=y and
> CONFIG_ZONE_DMA32=n.
> 
> arch/arm64/mm/init.c:195:17: error: use of undeclared identifier 'ZONE_DMA32'
>                 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(max_zone_dma_phys());
> 
> Change since v1:
> 1. only expose CONFIG_ZONE_DMA32 when CONFIG_EXPERT=y
> 2. remove redundant IS_ENABLED(CONFIG_ZONE_DMA32)
> 
> Cc: Robin Murphy <robin.murphy@....com>
> Signed-off-by: Miles Chen <miles.chen@...iatek.com>

Queued for 5.3. Thanks.

-- 
Catalin