From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH v2] xen/keyhandler: Rework keyhandler
	infrastructure
Date: Thu, 24 Sep 2015 11:36:30 +0100
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>> +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