+void register_irq_keyhandler(unsigned char key,
+                             irq_keyhandler_fn_t *fn,
+                             const char *desc,
+                             bool_t diagnostic);
I wonder whether the last parameter is really useful here.

Yes.  There are diagnostic irq_keyhandlers, 'd' for example.

All callers in practice will be __init, so overhead is not interesting, and it should be present for completeness.

~Andrew

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