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Message-ID: <20181109074955.GA27489@lst.de>
Date: Fri, 9 Nov 2018 08:49:55 +0100
From: Christoph Hellwig <hch@....de>
To: John Stultz <john.stultz@...aro.org>
Cc: hch@....de, Will Deacon <will.deacon@....com>,
Catalin Marinas <catalin.marinas@....com>,
robin.murphy@....com, konrad.wilk@...cle.com,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
iommu@...ts.linux-foundation.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Valentin Schneider <valentin.schneider@....com>
Subject: Re: [PATCH 06/10] swiotlb: use swiotlb_map_page in
swiotlb_map_sg_attrs
On Tue, Nov 06, 2018 at 05:27:14PM -0800, John Stultz wrote:
> But at that point if I just re-apply "swiotlb: use swiotlb_map_page in
> swiotlb_map_sg_attrs", I reproduce the hangs.
>
> Any suggestions for how to further debug what might be going wrong
> would be appreciated!
Very odd. In the end map_sg and map_page are defined to do the same
things to start with. The only real issue we had in this area was:
"[PATCH v2] of/device: Really only set bus DMA mask when appropriate"
so with current mainline + that you still see a problem, and if you
rever the commit we are replying to it still goes away?
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