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@linutronix.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

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Tested-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>

---
 include/asm-x86/irq_vectors.h |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)
Index: linux-2.6/include/asm-x86/irq_vectors.h
===================================================================
--- linux-2.6.orig/include/asm-x86/irq_vectors.h
+++ linux-2.6/include/asm-x86/irq_vectors.h
@@ -113,28 +113,26 @@
 
 # if defined(CONFIG_X86_IO_APIC) || defined(CONFIG_PARAVIRT) || defined(CONFIG_X86_VISWS)
 
+#ifdef CONFIG_X86_64
+#  define NR_IRQS		(32 * NR_CPUS + 224)
+#else
 #  define NR_IRQS		224
-
-#  if (224 >= 32 * NR_CPUS)
-#   define NR_IRQ_VECTORS	NR_IRQS
-#  else
-#   define NR_IRQ_VECTORS	(32 * NR_CPUS)
-#  endif
+#endif
 
 # else /* IO_APIC || PARAVIRT */
 
 #  define NR_IRQS		16
-#  define NR_IRQ_VECTORS	NR_IRQS
 
 # endif
 
 #else /* !VISWS && !VOYAGER */
 
 # define NR_IRQS		224
-# define NR_IRQ_VECTORS		NR_IRQS
 
 #endif /* VISWS */
 
+#define NR_IRQ_VECTORS		NR_IRQS
+
 /* Voyager specific defines */
 /* These define the CPIs we use in linux */
 #define VIC_CPI_LEVEL0			0
--
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