I revised the patch and it came out simpler (and much smaller) this time :) Please consider the following version:
<-Snip->
This patch disables unique IO_APIC_ID check for xAPIC systems running in EM64T mode. Xeon-based ES7000s panic failing this unnecessary check. IO_APIC_IDs only need to be unique in case of serial APIC bus. xAPIC systems deliver interrupts over the system bus.
Signed-off by: Natalie Protasevich <[email protected]>
---
diff -puN arch/x86_64/kernel/io_apic.c~no-ioapic-check-x86_64-2 arch/x86_64/kernel/io_apic.c
--- linux-2.6.13-rc3-mm3/arch/x86_64/kernel/io_apic.c~no-ioapic-check-x86_64-2 2005-05-06 21:58:55.149700760 -0700
+++ linux-2.6.13-rc3-mm3-root/arch/x86_64/kernel/io_apic.c 2005-05-06 22:00:41.361554104 -0700
@@ -1867,12 +1867,16 @@ int __init io_apic_get_unique_id (int io
int i = 0;
/*
+ * xAPIC systems take advantage of APIC system bus architecture.
+ */
+
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+ return apic_id;
+
+ /*
* The P4 platform supports up to 256 APIC IDs on two separate APIC
* buses (one for LAPICs, one for IOAPICs), where predecessors only
* supports up to 16 on one shared APIC bus.
- *
- * TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
- * advantage of new APIC bus architecture.
*/
if (physids_empty(apic_id_map))
_
-
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