linux-kernel - Re: [PATCH] [PATCH] ARM64: Setup DMA32 zone size by bootargs

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Message-ID: <20200916083703.GA26411@infradead.org>
Date:   Wed, 16 Sep 2020 09:37:03 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Phil Chang <phil.chang@...iatek.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Alix Wu <alix.wu@...iatek.com>, linux-doc@...r.kernel.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        YJ Chiang <yj.chiang@...iatek.com>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, Will Deacon <will@...nel.org>,
        Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH] [PATCH] ARM64: Setup DMA32 zone size by bootargs

On Wed, Sep 16, 2020 at 03:22:06PM +0800, Phil Chang wrote:
> this patch allowing the DMA32 zone be configurable in ARM64.

Hell no.  The point of the DMA32 zone is that it is exactly the first
4GiG, and not some random size someone decided without explaining why.