linux-kernel - Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports to platform devices

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Message-Id: <200707241434.32374.bjorn.helgaas@hp.com>
Date:	Tue, 24 Jul 2007 14:34:32 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Sébastien Dugué <sebastien.dugue@...l.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports to platform devices - broke my serial console

On Tuesday 24 July 2007 02:13:49 pm Jeff Garzik wrote:
> Bjorn Helgaas wrote:
> >   - Linux enumerates CPUs with the MADT; I think Windows uses the ACPI
> >     namespace.  Sometimes there are multiple MADTs, and sometimes Linux
> >     uses the wrong one.
> 
> Color me skeptical.  I think we would have bug reports if we were really 
> getting this wrong a lot of the time.

We do have bug reports, like http://bugzilla.kernel.org/show_bug.cgi?id=7465
Not very many, but enough that I'd like to get to the root cause.

> You seem to be missing that ignoring BIOS is often a VERY GOOD thing, 
> that has served us well many many times in the past.

I can see that I'm not going to win this argument :-)

But I would like to find and fix the problem with Sebastien's machine,
because the patch does fix real problems with IRDA and I think the fix
for Sebastien is likely to fix other PNP issues.

Bjorn
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