In message: <20081228053530.gf18...@elvis.mu.org>
Alfred Perlstein <alf...@freebsd.org> writes:
: * Scott Long <sco...@samsco.org> [081226 18:34] wrote:
: >
: > On Dec 26, 2008, at 5:38 PM, Alfred Perlstein <alf...@freebsd.org>
: > wrote:
: > >
: > >Easy enough to stash a "once" varible in the generic device struct
: > >and warn when returning from an isr when INVARIANTS or something is
: > >turned on.
: > >
: > >Then you'd only get one warning per device once it happens.
: > >
: > >
: >
: > I prefer to do nothing. It's not unsafe or erroneous to access cfg
: > registers. But if some kind of message does get added, I insist that
: > it drop all pretenses and say, "you're too poor to run freebsd, come
: > back when you can afford better hardware.". :)
:
: Well that could be the result of a driver that has a "bug" that
: makes it access cfg space when it does not need to, as what seems
: to have just been fixed.
I think we need to have better tools to peer into what's going on
inside a driver (or other well defined areas of the kernel). Maybe
dtrace might be the right way to do this?
Warner
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