Tobias, plase try this patch:
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>From 88c590a2ecafc8279388f25bfbe1ead8ea3507a6 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig
Date: Tue, 20 Aug 2019 11:45:49 +0900
Subject: dma-direct: fix zone selection after an unaddressable CMA allocation
The new dma_alloc_contiguous hides if we allocate
Hi Tobias
On Fri, Aug 16, 2019 at 10:16:45PM +0200, Tobias Klausmann wrote:
> > do you have CONFIG_DMA_CMA set in your config? If not please make sure
> > you have this commit in your testing tree, and if the problem still
> > persists it would be a little odd and we'd have to dig deeper:
> >
>
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