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x86: fix APIC related bootup crash on Athlon XP CPUs 

warmbloodedcreature@gmail.com reported that an APIC-enabled
Asus a7v8x-x with an Athlon XP reboots early in the bootup:

   http://bugzilla.kernel.org/show_bug.cgi?id=8723

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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2007-11-26 20:42:20 +01:00
parent 52bfb36050
commit f44d9efd35
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/apic_32.c
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@ -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 * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
* needed on AMD. * needed on AMD.
*/ */
if (modern_apic()) if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
return; return;
/* /*
* Wait for idle. * Wait for idle.