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

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Date:	Fri, 1 Aug 2008 20:11:43 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.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

On Fri, Aug 1, 2008 at 7:58 PM, Eric W. Biederman <ebiederm@...ssion.com> wrote:
> "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
..
>
> 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.

#ifdef CONFIG_X86_32
# define MAX_IO_APICS 64
#else
# define MAX_IO_APICS 128
# define MAX_LOCAL_APIC 32768
#endif

so they can take 128*32 = 4096?

YH
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