On Mon, Aug 31, 2020 at 06:56:39PM +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/ (local)
[2] https://lore.kernel.org/lkml/20200604080120.2628-1-miles.chen@mediatek.com/ (local)
[3] https://lore.kernel.org/lkml/20200715205120.GA778876@bogus/ (local)

Cc: Mike Rapoport <redacted>
Cc: David Hildenbrand <redacted>
Cc: Yong Wu <yong.wu@mediatek.com>
Cc: Yingjoe Chen <redacted>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Miles Chen <redacted>

You forgot to add the tags here from v4, at least Matthias' Reviewed-by
is missing. Please add the missing tags and resend.


	Joerg

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