Re: [PATCH 26/26] dma-buf: Add kunit tests for mapping type selection

[sashiko-bot@kernel.org]

> Add an offer list and a select_mapping() callback to the mock exporter
> along with map/unmap for the two mock types.
> 
> Adds tests for the exporter/importer contract.
> 
>  - test_match_set_is_final: a later importer attaching, even one the
>    exporter answers differently, does not change an existing
>    attachment's match set or default. Later attachments influence what
>    the exporter selects at pin and map time, not previous attachments.
> 
>  - test_select_at_map: the exporter chooses a non-default entry
>    at the first map and the result is tagged with it. A pin taken
>    under the live mapping inherits the type and the choice survives
>    unmap/remap even though the exporter would answer differently. Only
>    dma_buf_invalidate_mappings() allows the exporter to make a different
>    selection. An -EBUSY from selection leaves nothing established.
> 
>  - test_select_at_pin: pin selects, and the choice survives map, unmap
>    and unpin so a pinned importer that is never invalidated keeps its
>    first type for the life of the import.
> 
> Assisted-by: LLM
> Signed-off-by: Alistair Popple <apopple@nvidia.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261026053623.202642-1-apopple@nvidia.com?part=26