From: Joe Perches <joe@perches.com>
Date: Mon, 31 May 2010 08:08:13 -0700

There are many uses of KERN_DEBUG that are reasonable to have
always enabled.

Doubtful.

pr_debug() makes a ton of sense as currently implemented.
It's for messages that we want both compile time and
run-time control over.

The case we have here in mac8390 seems like it should stay
as pr_info().  Because 1) it's already controlled by a
run-time knob so controlling it even further is confusing
and 2) the message is "informative", it lets the user know
a feature cannot be enabled, thus pr_info().