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From: Markus Armbruster <armbru@redhat.com>
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Date: Thu, 14 Apr 2016 09:39:07 +0200
In-Reply-To: <20160413205305-mutt-send-email-mst@redhat.com> (Michael
	S. Tsirkin's message of "Wed, 13 Apr 2016 20:53:37 +0300")
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Subject: Re: [Qemu-devel] [PATCH v3] fw_cfg: RFQDN rules, documentation
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, "Gabriel L . Somlo" <somlo@cmu.edu>, Laszlo Ersek <lersek@redhat.com>, qemu-devel@nongnu.org, Gerd Hoffmann <kraxel@redhat.com>

"Michael S. Tsirkin" <mst@redhat.com> writes:

> On Wed, Apr 13, 2016 at 06:19:55PM +0200, Markus Armbruster wrote:
>> "Michael S. Tsirkin" <mst@redhat.com> writes:
>> 
>> > On Wed, Apr 13, 2016 at 10:59:35AM +0200, Markus Armbruster wrote:
>> >> If we can protect them without
>> >> complicating or breaking stuff, sure, why not.  But not at all costs.
>> >
>> > The stuff we break is precisely the stuff our warnings
>> > say might break at any time. So since you believe users
>> > might be relied on not to ignore warnings, it should be ok ...
>> >
>> > As for complicating things - about 5 lines of code are spent
>> > on the unsupported/root/ hack. It *is* a hack but
>> > contained enough not to worry me too much ...
>> 
>> I'm not worried about the implementation complexity at all.  It's the
>> user interface complexity.  After this patch, we have a non-trivial
>> mapping from -fw_cfg name to FW_CFG filename to explain.  Whereas now,
>> -fw_cfg name *is* the FW_CFG path.
>
> Only for people who ignore the rules. Most people have a trivial
> mapping.

Even when most usage falls into the simple cases, you still have to
explain all cases.

An interface's complexity is a property of the interface, not of its
usage.