Commit f44d9efd authored by Ingo Molnar's avatar Ingo Molnar

x86: fix APIC related bootup crash on Athlon XP CPUs reported that an APIC-enabled
Asus a7v8x-x with an Athlon XP reboots early in the bootup:

after a long marathon of spontaneous-reboot debugging, it turns
out to be caused by sync_Arb_ids(). AMD CPUs never really needed
this sequence anyway, so just return early if we meet an AMD CPU.
Signed-off-by: default avatarIngo Molnar <>
Signed-off-by: default avatarThomas Gleixner <>
parent 52bfb360
......@@ -789,7 +789,7 @@ void __init sync_Arb_IDs(void)
* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
* needed on AMD.
if (modern_apic())
if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
* Wait for idle.
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