On Wed, Oct 21, 2026 at 10:03:22AM +0800, Johnny.Fan wrote:

These synthetic devices have no fwnode, so the firmware-described IRQ affinity cannot tell which CPUs implement the feature. Pass the CPU mask as platform data and have the drivers prefer it over the IRQ affinity when present.

Could the MADT-derived CPU masks be exposed through platform_get_irq_affinity(), so SPE and TRBE can continue using the common interface without fetching ACPI-specific data?

TBC, I don't know ACPI or GIC. I just thought it might be a neat approach.

Apply the same treatment to TRBE, which shares this registration code. TRBE must also pass a stable copy of the mask to request_percpu_irq_affinity(), since supported_cpus is pruned as CPUs are probed.

I wouldn't expect any changes to the SPE or TRBE drivers if platform_get_irq_affinity() can return the correct CPU mask.

Thanks, Leo