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Date:   Fri, 4 Sep 2020 13:21:18 +0200
From:   Joerg Roedel <joro@8bytes.org>
To:     Miles Chen <miles.chen@mediatek.com>
Cc:     Rob Herring <robh+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        iommu@lists.linux-foundation.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, wsd_upstream@mediatek.com,
        Yong Wu <yong.wu@mediatek.com>,
        Chao Hao <chao.hao@mediatek.com>,
        Yingjoe Chen <yingjoe.chen@mediatek.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        David Hildenbrand <david@redhat.com>,
        Christoph Hellwig <hch@lst.de>, Rob Herring <robh@kernel.org>
Subject: Re: [RESEND PATCHv5] iommu/mediatek: check 4GB mode by reading
 infracfg
Message-ID: <20200904112117.GC16609@8bytes.org>
References: <20200904104038.4979-1-miles.chen@mediatek.com>
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On Fri, Sep 04, 2020 at 06:40:38PM +0800, Miles Chen wrote:
> In previous discussion [1] and [2], we found that it is risky to
> use max_pfn or totalram_pages to tell if 4GB mode is enabled.
> 
> Check 4GB mode by reading infracfg register, remove the usage
> of the un-exported symbol max_pfn.
> 
> This is a step towards building mtk_iommu as a kernel module.
> 
> [1] https://lore.kernel.org/lkml/20200603161132.2441-1-miles.chen@mediatek.com/
> [2] https://lore.kernel.org/lkml/20200604080120.2628-1-miles.chen@mediatek.com/
> [3] https://lore.kernel.org/lkml/20200715205120.GA778876@bogus/

Applied, thanks.