Re: [PATCH 4/4] i915: fix remap_io_sg to verify the pgprot

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To: Serge Belyshev <belyshev@xxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 4/4] i915: fix remap_io_sg to verify the pgprot
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 17 May 2021 14:37:16 +0200
Cc: Christoph Hellwig <hch@xxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>, Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>, Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Daniel Vetter <daniel.vetter@xxxxxxxx>, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>, linux-mm@xxxxxxxxx
In-reply-to: <87pmxqiry6.fsf@depni.sinp.msu.ru>
References: <20210326055505.1424432-1-hch@lst.de> <20210326055505.1424432-5-hch@lst.de> <87pmxqiry6.fsf@depni.sinp.msu.ru>
User-agent: Mutt/1.5.17 (2007-11-01)

As an ad-hoc experiment:  can you replace the call to remap_pfn_range
with remap_pfn_range_notrack (and export it if you build i915 modular)
in remap_io_sg and see if that makes any difference?

Follow-Ups:
- Re: [PATCH 4/4] i915: fix remap_io_sg to verify the pgprot
  - From: Serge Belyshev

References:
- add remap_pfn_range_notrack instead of reinventing it in i915 v2
  - From: Christoph Hellwig
- [PATCH 4/4] i915: fix remap_io_sg to verify the pgprot
  - From: Christoph Hellwig
- Re: [PATCH 4/4] i915: fix remap_io_sg to verify the pgprot
  - From: Serge Belyshev

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