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Message-ID: <86802c440808012011s109b27bbvb49e1794f66d9acc@mail.gmail.com>
Date: Fri, 1 Aug 2008 20:11:43 -0700
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH] x86: 64bit support more than 256 irq v2
Cc: "Ingo Molnar" <mingo@elte.hu>, "Thomas Gleixner" <tglx@linutronix.de>,
       "H. Peter Anvin" <hpa@zytor.com>,
       "Dhaval Giani" <dhaval@linux.vnet.ibm.com>,
       "Mike Travis" <travis@sgi.com>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       linux-kernel@vger.kernel.org
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On Fri, Aug 1, 2008 at 7:58 PM, Eric W. Biederman <ebiederm@xmission.com> wrote:
> "Yinghai Lu" <yhlu.kernel@gmail.com> writes:
>
>> On Fri, Aug 1, 2008 at 7:02 PM, Yinghai Lu <yhlu.kernel@gmail.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