linux-kernel - Re: [PATCH] x86: 64bit support more than 256 irq v2

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Date:	Fri, 01 Aug 2008 19:58:56 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Mike Travis" <travis@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: 64bit support more than 256 irq v2

"Yinghai Lu" <yhlu.kernel@...il.com> writes:

> On Fri, Aug 1, 2008 at 7:02 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>> Dhaval Giani got:
>> kernel BUG at arch/x86/kernel/io_apic_64.c:357!
>> invalid opcode: 0000 [1] SMP
>> CPU 24
>> ...
>>
>> his system (x3950) has 8 ioapic, irq > 256
>>
>> caused by
>>        commit 9b7dc567d03d74a1fbae84e88949b6a60d922d82
>>        Author: Thomas Gleixner <tglx@...utronix.de>
>>        Date:   Fri May 2 20:10:09 2008 +0200
>>
>>           x86: unify interrupt vector defines
>>
>>           The interrupt vector defines are copied 4 times around with minimal
>>           differences. Move them all into asm-x86/irq_vectors.h
>>
>> because 64bit allow same vector for different cpu to serve different irq
>>
>> need to create that array dynamically later
>>
>> v2: change NR_IRQS to 1024
>>
>> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>> Tested-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
>
> this is for
> http://bugzilla.kernel.org/show_bug.cgi?id=11201
>
> but need SGI guys to verify in their system. they like to have NR_IRQS to be 224

There was a patch that came out a while ago that set NR_IRQS as NR_IOAPICS*32 from
SGI.  Where that got to I don't recall.

Eric
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