[PATCH] I/O APIC confusion

Dell 2600 could not bring up its MPT Fusion and hung there:
I/O APIC #7 at 0xFEC82000 was muddled with #8 at 0xFEC82800,
because the IO_APIC_BASE fixmap macro assumed page boundary.

No longer do I think all those I/O APIC messages at startup
a waste of log buffer!

include/asm-i386/io_apic.h

@@ -16,7 +16,8 @@
 #define APIC_MISMATCH_DEBUG
 
 #define IO_APIC_BASE(idx) \
-		((volatile int *)__fix_to_virt(FIX_IO_APIC_BASE_0 + idx))
+		((volatile int *)(__fix_to_virt(FIX_IO_APIC_BASE_0 + idx) \
+		+ (mp_ioapics[idx].mpc_apicaddr & ~PAGE_MASK)))
 
 /*
  * The structure of the IO-APIC: