Re: Garbled output from kgdb?

[Jung-uk Kim <jkim_(_at_)_FreeBSD_(_dot_)_org>]

On Monday 11 May 2009 09:52 am, John Baldwin wrote:
> On Tuesday 05 May 2009 5:43:01 pm Jung-uk Kim wrote:
> > On Tuesday 05 May 2009 04:09 pm, Jung-uk Kim wrote:
> > > On Tuesday 05 May 2009 12:51 pm, Andriy Gapon wrote:
> > > > BTW, this issue seems to be fixed in Jung-uk's acpi patches
> > > > for newer acpica imports, but it is not fixed both in
> > > > stable/7 and head.
> > >
> > > Yes, it was fixed in my patchsets long ago, which uses spin
> > > lock for AcpiOsAcquireLock(). :-)
> >
> > The attached patch is for -STABLE.  Note that it is only compile
> > tested on amd64.
>
> This looks fine to test.  The patch has gratuitous style changes I
> wouldn't include in a commit though.

It should work but I don't plan to commit it any time soon. :-) In 
fact, the patch was meant to be a rewrite for new ACPI-CA, which 
actually has a real mutex.  Currently, mutex is emulated with 
semaphore.  The problem is semaphore has no concept of ownership 
while mutex does, i.e., any thread can acquire/release it without 
checking its ownership or order.  FYI, the OSL API (ACPI_MUTEX_TYPE) 
is finalized in ACPI-CA 20081204.

Jung-uk Kim
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