Hi Huang,
7ad6e9435596 ("ACPI, APEI, Manage GHES as platform devices") added
platform devices so the GHES driver could be built as a module and
automatically loaded when needed.
Later, 86cd47334b00 ("ACPI, APEI, GHES, Prevent GHES to be built as
module") removed the ability to build GHES as a module.
Should we revert 7ad6e9435596? It's inconsistent to handle GHES, but
not other error sources, as a platform device. And having it as a
platform device probably puts gunk in sysfs that we don't need.
Bjorn
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