linux-kernel - Re: [PATCH] drm/test/shmem: set a DMA mask for the mock device

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Date: Mon, 26 Feb 2024 16:48:51 +0100
From: Marco Pagani <marpagan@...hat.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>, Guenter Roeck <linux@...ck-us.net>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/test/shmem: set a DMA mask for the mock device


On 2024-02-26 12:26, Maxime Ripard wrote:
> Hi,
> 
> On Mon, Feb 26, 2024 at 12:00:27PM +0100, Marco Pagani wrote:
>> Set a DMA mask for the mock device to avoid warnings generated in
>> dma_map_sgtable().
>>
>> Reported-by: Guenter Roeck <linux@...ck-us.net>
>> Signed-off-by: Marco Pagani <marpagan@...hat.com>
> 
> I've submitted last week this patch:
> https://lore.kernel.org/all/20240221125324.718192-1-mripard@kernel.org/
> 
> Which should be equivalent, but fixes the issue for all users in the
> tree.

Hi, thanks for letting me know. Fixing this issue for all DRM tests that were
using platform devices through the helpers makes perfect sense to me. I'm a
little more thoughtful about setting the mask for all KUnit tests that use fake
devices since there may be specific use cases. Just one curiosity: why setting
the default mask manually instead of using one of the dma_set_*() functions?

Thanks,
Marco