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51db5336e1
This debugging hack is important to enforce the rule that importers should *never* touch the underlying struct page of the exporter. Instead of just mangling the page link create a copy of the sg_table but only copy over the DMA addresses and not the pages. This will cause a NULL pointer de-reference if the importer tries to touch the struct page. Still quite a hack but this at least allows the exporter to properly keeps it's sg_table intact while allowing the DMA-buf maintainer to find and fix misbehaving importers and finally switch over to using a different data structure in the future. v2: improve the hack further by using a wrapper structure and explaining the background a bit more in the commit message. v3: fix some whitespace issues, use sg_assign_page(). v4: give the functions a better name Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com> Link: https://lore.kernel.org/r/20251205130604.1582-1-christian.koenig@amd.com