linux-kernel - Re: IO-APIC + timer doesn't work (was: Linux 2.6.20-rc1)

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Date:	Mon, 18 Dec 2006 06:14:28 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Tobias Diedrich <ranma@...edrich.de>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Tobias Diedrich <ranma+kernel@...edrich.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Yinghai Lu <yinghai.lu@....com>,
	Andrew Morton <akpm@...l.org>
Subject: Re: IO-APIC + timer doesn't work (was: Linux 2.6.20-rc1)

Tobias Diedrich <ranma@...edrich.de> writes:

> Linus Torvalds wrote:
>
>> Your dmesg is kind of interesting:
>> 
>> ..TIMER: trying IO-APIC=0 PIN=0 with 8259 IRQ0 enabled(7)APIC error on CPU0:
> 04(40)
>>  .. failed
>> 
>> where that APIC error on CPU0 seems to be a "Send accept error" and "Send 
>> illegal vector" thing. I think we actually got the interrupt there, but 
>> because we had some APIC setup bug, we didn't accept it properly, and it 
>> resulted in that "APIC error" thing. Maybe. 
>
> I just tried changing the code so the "8259 IRQ0 enabled" case is
> tested first and with that it boots fine.

Could you try removing the clear_IO_APIC_pin from try_io_apic_pin.

This isn't a complete fix but I believe for your hardware it will
fix the problem and it points at what the real fix is.  

Not properly programming the io_apic for the case we want to test.

Eric
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