linux-kernel - Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325

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Message-ID: <20080629200210.GB31633@elte.hu>
Date:	Sun, 29 Jun 2008 22:02:10 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Andi Kleen <andi-suse@...stfloor.org>
Subject: Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325


* Maciej W. Rozycki <macro@...ux-mips.org> wrote:

>  You may argue this is a regression, but this is simply the cost paid 
> for progress -- the kernel stays within the spec as defined both by 
> ACPI and MPS, we have just started using a different configuration now 
> and an interrupt source override provided by the manufacturer 
> explicitly states INTIN2 is good to use.  In a sense you were simply 
> lucky previously the kernel was bad enough with the way it configured 
> the timer through the I/O APIC it failed completely avoiding the bug 
> in your firmware.  Now the bug has got uncovered.

well as long as we eliminate the bad effects around via DMI exceptions 
nobody will feel the need to argue whether it's a regression ;-) [this 
problem could be argued to be a regression, even if it's caused by prior 
luck/stupidity of Linux. We have to live with the effects of our 
mistakes.]

	Ingo
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